A Rotameter flow meter is a variable area flow meter based on float position measurement. It is suitable for liquid and gas volumetric flow measurement and control.
The LZ series Rotameter Flowmeter provided by Sino-Inst adopts a 304/316 stainless steel structure. It can be used to measure the flow of liquid, gas, and steam. Especially suitable for low flow velocity and small flow. Flow measurement of high temperature, high pressure, strong corrosion, conductive or non-conductive media.
LZ series metal Rotameter Flowmeter (also known as metal Variable Area Flow Meters) is divided into two series, LZH and LZ. It has the characteristics of simple structure, reliable operation, wide application range, high precision, and convenient installation.
This series of flowmeters is compared with glass rotor flowmeters. It has the characteristics of high-pressure resistance, high temperature, a strong sense of safety, and concise readings.
It can also be used for flow measurement of opaque and corrosive media. The pipe body and flange of the instrument are made of stainless steel (1Cr18Ni9Ti or OCr18Ni12Ho2Ti).
LZH series: Conventional orifice plates and floats are made of stainless steel. Anticorrosive orifice plate floats and tubes inner linings are made of PTFE.
LZ series: The float and tapered tube are made of stainless steel, and this series is non-corrosive.
The LZH series consists of an instrument tube, a standard orifice plate, a cone float, and a magnetic converter; The LZ series consists of an instrument tube, a standard float, a tapered tube, and a magnetic converter.
The working parameters of this series of meters and their conversion and correction are provided by the meter calculation software to provide standard calculation methods. The meter’s measurement accuracy is guaranteed.
Ordinary type H1:-40℃~100℃
High temperature type H2: -80℃-250℃
Ambient temperature
Pointer type: -40℃~65℃
Intelligent type: -25℃~65℃
Connection method
Flange connection (flange standard: refer to GB9115-88, JB82-59 (6.4IPa), special specifications are determined according to user requirements)
Explosion-proof grade
Intrinsically safe: ExibIICT4 with safety barrier LB987S, explosion-proof certificate number GYB06884
Explosion-proof: ExdIIBT4, explosion-proof certificate number GYB071017
Protection level
IP65
Viscosity
DN15: ≤5mPa·s, DN25~DN150: ≤250mPa·s
Product performance standards
JB/T6844-1993
Rotameter flow meter applications
The metal Rotameter flow meter is suitable for the flow measurement of small-diameter and low-velocity media. It can measure most media such as gas and liquid.
The metal Rotameter flow meter can measure the instantaneous flow and cumulative flow of gases and liquids, including corrosive acid, alkali, and salt solutions. It is especially preferred when the flow is low or when a purely mechanical or inconvenient power supply is required.
Rotameter flow meters are mostly vertical installation, bottom entry, and top exit type, and can also be installed horizontally. The price is higher. Let me show you a sample.
This is an explosion-proof type for measuring corrosive liquids.
This is a smart type. It can measure gas and liquid. There should be no impurities.
This one is installed horizontally to measure nitrogen. It is purely mechanical to display instantaneous flow rate.
Installed vertically on a vibration-free pipe. The fluid flows through the meter from bottom to top.
When measuring dirty fluids, a filter should be installed upstream of the meter
If the fluid itself is pulsating, a buffer tank can be installed. If the instrument itself oscillates, a damping device can be installed.
The gas in the instrument must be drained of the liquid.
The control valve in the measurement and control system should be installed downstream of the flowmeter. When used for gas measurement, ensure that the working pressure is not less than 5 times the pressure loss of the flowmeter. In order to make the flowmeter work stably.
Before installing the metal rotor flowmeter, the welding slag in the pipeline should be purged. Remove the stop element from the flowmeter when installing. When using after installation, open the control valve slowly. Avoid impact damage to the flowmeter.
If the measurement requires a wide range of flow, the range exceeds 10 o’clock. Two floats of different shapes and weights can be placed in one instrument. Take the frivolity reading when the flow is small. After the float reaches the top, take the reading of the heavy float. The range can be expanded to 50-100.
Liquid meters are usually calibrated with water, and gas meters are calibrated with air. The fixed value is in the engineering standard state. If the fluid density, gas pressure, and temperature of the use conditions are inconsistent with the calibration. Make necessary conversions.
Sino-Inst is a globally recognized supplier and manufacturer of Rotameter flow meters, located in China.
The top supplying country is China (Mainland), which supply 100% of the Rotameter flow meter respectively.
Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Rotameter flow meter products are most popular in Domestic Market, Southeast Asia, and Mid East.
You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Flow nozzle is also called a standard nozzle flow meter, standard nozzle, ISA1932 nozzle. It is a differential pressure flow meter suitable for high temperature and high-pressure fluid measurement.
Flow nozzle, like standard orifice plate, venturi tube flowmeter, and venturi nozzle, belongs to the standard throttling device specified by national standards. The pressure loss of the nozzle flowmeter is small, so it saves energy, is more sturdy and durable, suitable for high temperature and high-pressure fluids, and is widely used in steam flow measurement in electric power, chemical, and other industries.
Compared with the orifice Flowmeter, the pressure loss of the nozzle Flowmeter is small, so it saves energy, is more durable, suitable for high temperature and high-pressure fluid, and is widely used in steam flow measurement in electric power, chemical industry, and so on.
Nozzle flowmeter produced by our company includes a standard nozzle (ISA1932 nozzle), long neck nozzle two. The design and manufacture are in accordance with international standard ISO5167 or national standard GB/T2624.
Nozzle Flowmeter throttle structure is easy to copy, simple, firm, stable and reliable performance, long service life.
Nozzle is less pressure loss than orifice plate, the length of straight pipe section is also short.
Nozzle calculation adopts international standard and processing, check according to JJG640-94, no real flow check.
Accuracy is high, repeatability is good, outflow coefficient is stable.
Circular arc structure design can measure various liquids, gases, steam and various dirty media.
The nozzle measurement is based on the throttling principle of fluid mechanics.
When the fluid-filled with the pipe flows through the nozzle in the pipe, the flow beam will form a local contraction at the nozzle, thus accelerating the flow rate and reducing the static pressure.
Then in the nozzle before and after the pressure drop or called pressure difference. The greater the flow rate of the medium, the greater the pressure difference before and after the nozzle.
Installation of nozzle parts: with tape and welding of upper and lower pipe sections and then setting pressure holes according to diameter distance (D-D/2)•
Implementation criteria: IS05167;GB/T2624
Accuracy: compliance :±2.0 per cent
Material: Carbon steel, alloy steel, stainless steel, etc. can be selected according to medium temperature.
The standard nozzle has a long history and a large amount of various test data.
The nozzle flowmeter has a simple and firm structure, no moving parts, and is stable and reliable for long-term use.
Rich experience in design, manufacture and application, high standardization, no need for real-flow calibration.
The standard nozzle has reliable experimental data and perfect international and national standards. The measurement data is true and credible and can be used as a meter for trade settlement.
Disadvantages:
The production is more complicated and the unit price is higher.
The flow rate of the nozzle flowmeter. When the pressure difference between the front and back of the nozzle is greater than a certain value, the flow rate through the nozzle is a fixed value, and the measurement accuracy level is high;
The nozzle steam flowmeter has the characteristics of high temperature and high pressure resistance, impact resistance, long service life, large measurement range, high measurement accuracy, and small pressure loss. It can be used for trade settlement. The standard nozzle is designed and manufactured according to the national standard GB/T2624-2006, and it is verified according to the national standard JJG640-94. No need for real-flow calibration.
The inlet of the JT-BPZ standard nozzle steam flow meter is divided into ISA standard nozzle and long diameter nozzle according to the arc-shaped contour structure.
In the main steam pipeline of power station boilers, the flow meters we commonly see are mainly ISA1932 nozzle flowmeters and long-diameter nozzle flowmeters.
The ISA1932 nozzle flowmeter is mainly composed of a standard nozzle, two pressure pipes, and two ring-type short sections butt welded together.
The long-diameter nozzle flowmeter is mainly composed of a long-diameter nozzle, a positioning pin, a supporting ring, two pressure-taking pipes, and a measuring pipe.
Of course, there are many types of flow meters available for steam flow meters. How to choose and use it should be analyzed and selected according to the specific situation. You can refer to: How to choose a flowmeter for steam measurement.
Venturi flow meter is a flow measurement method based on the principle of differential pressure. Commonly used to measure the flow of fluids such as air, natural gas, coal gas, and water. In the standard throttling device, the upstream and downstream straight pipe sections required by it are short. The lasting pressure loss is small, the performance is stable, and the maintenance is convenient.
When a flow nozzle is placed in a pipe carrying whose rate of flow is to be measured, the flow nozzle causes a pressure drop which varies with the flow rate. This pressure drop is measured using a differential pressure sensor and when calibrated this pressure becomes a measure of flow rate.
Sino-Inst, Manufacuturer for differential pressure flow meters. Including Flow Nozzle, Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas and steam flow measurement.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
V-cone flow meter is also known as cone-type flow meter; inner cone flow meter; integrated V-cone flow meter. The principle of V-cone flow meter is the same as other DP flow meters, and it is also a throttling DP flowmeter.;
The basic principle of the V-cone flow meter is the same as that of other types of differential pressure flowmeters. They are based on the principle of energy conservation in the sealed pipeline. The V-cone flow meter is a cone-shaped shutoff piece suspended in the center of the pipeline, and the cone-shaped piece hinders the flow of the medium. Reshape the flow rate curve. Measuring media include water, steam, air, natural gas, nitrogen, coke oven gas, etc. The maximum working temperature is 450℃, and the maximum pressure is 40Mpa.
Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!
Low installation requirements. The first 0～3D straight pipe, the rear 0～1D straight pipe section;
Wide range ratio. It is usually 10:1, and it can be up to 50:1 by selecting appropriate parameters;
The pressure loss is small. For the same β value, the pressure loss is 1/3～1/5 of the orifice;
Wear resistance. After the streamlined cone is throttled, a vacuum layer effect is produced on the surface of the cone, making the cone not easy to wear;
No clogging, no adhesion. The conical thorough purging design avoids the retention of residue, condensate or particles in the fluid;
Long-term stability is good. β value can be unchanged for a long time, and long-term accurate measurement is guaranteed;
High accuracy: 0.5 level;
Good repeatability. Better than 0.1%;
The signal is stable. “Signal fluctuation” is 1/10 of the orifice;
Wide β value range. The unique geometry of the V-cone flow sensor allows a wide β value range;
Wide range of caliber: DN25～DN2000;
Measurable high-temperature and high-pressure media: the maximum working temperature is 850℃, and the maximum pressure is 40MPa;
Can detect dirty media (coke oven gas, blast furnace gas, raw oil, residual oil, etc.);
Measurable gas-liquid two-phase medium (humidity, condensate, etc.);
V-Cone Flow Meter can successfully measure fluids:
Gas: Gas: coke oven gas, blast furnace gas, city gas; Natural gas: includes natural gas with a moisture content of more than 5%; Various hydrocarbon gases: alkanes, olefins and other gases; Various gas production: hydrogen, helium, argon, oxygen, nitrogen, etc.; Corrosive gas: wet chloride gas, etc.; Air: including air containing water, dust, compressed air, etc.; Flue gas: flue gas discharged from various boilers and heating furnaces;
Armstrong International’s Veris – Flow Measurement solutions provide outstanding flow measurement technology to meet the critical needs for your environment. Their Verabar and Accelabar patented solutions deliver consistent, accurate and reliable flow measurement to handle a wide variety of liquids, gases and steam.
The metal Rotameter flow meter is suitable for the flow measurement of small-diameter and low-velocity media. It can measure most media such as gas and liquid.
The metal Rotameter flow meter can measure the instantaneous flow and cumulative flow of gases and liquids, including corrosive acid, alkali, and salt solutions. It is especially preferred when the flow is low or when a purely mechanical or inconvenient power supply is required.
This is an explosion-proof type for measuring corrosive liquids.
This is a smart type. It can measure gas and liquid. There should be no impurities.
This one is installed horizontally to measure nitrogen. It is purely mechanical to display instantaneous flow rate.
V-Cone Flow Meter Working Principle
The V-cone flow meter is a differential pressure flow meter. The flow meter designed on the principle of differential pressure has been applied for more than 100 years.
The principle of differential pressure is based on the principle of energy conversion in a sealed pipeline. That is to say, for a stable fluid, the flow rate is proportional to the square root of the flow rate of the medium in the pipeline.
When the medium is close to the cone, its pressure is P1. When the medium passes through the intercepting area of the cone, the speed increases and the pressure decreases to P2. Both P1 and P2 are led to the differential pressure transmission through the tapping port of the cone flowmeter When the flow rate changes, the differential pressure between the two pressure taps of the cone flowmeter will increase or decrease.
The calculation formula used by the V-cone flow meter for flow calculation is the same as other differential pressure flow meters. However, the unique design of its intercepting element forces the medium in the center of the pipeline to flow around the cone. Compared with other differential pressure flowmeters. There are many advantages.
We can understand the performance of the cone flowmeter with the help of the ideal flow rate curve distribution. The fluid in the pipeline is not disturbed or hindered, which is what we call the ideal flow state. Its flow velocity is evenly distributed, and the flow velocity near the pipe wall is almost zero.
The flow velocity in the center of the pipe reaches the maximum. The flow velocity near the pipe wall is almost equal to Zero. It is caused by the friction of the pipe wall against the medium. Because the cone is suspended in the center of the pipeline, it is directly in contact with the high-speed area of the fluid, forcing the fluid in the high-speed area to mix with the fluid in the low-velocity area near the pipe wall to make the flow rate uniform.
Therefore, even if the flow rate is very low, the cone flowmeter can still make the fluid and the highest flow rate in the center of the pipe continuously interact to produce the correct differential pressure.
V-Cone Flow Meter Calculation
The simplified formula is:
Where: QV-fluid volume flow m³/h Cd-outflow coefficient βV—Equivalent diameter ratio dV—is the maximum diameter of the cone, D is the inner diameter of the pipe ρ—Density under fluid conditions ε-gas expansion coefficient
In reality, it is difficult to distribute the flow rate uniformly, and any changes in the pipeline may affect the fluid. Such as: bay head, valve, reducing diameter, expanding diameter, pump, tee, etc. The cone flowmeter uses a cone to reshape the upstream flow velocity distribution curve. Even in extremely harsh conditions, measurement accuracy can still be guaranteed.
If the medium has particulate impurities, it is easy to block.
The pressure loss is the largest in the non-movable components such as electromagnetic, vortex, thermal, and Vera, and the flowmeter based on the principle of non-orifice plate. There will be about 10~20% pressure loss. The pressure loss will be even greater if several sets are used on one pipeline.
If the V-cone flow meter is broken, it must be removed. Downtime for many businesses is troublesome.
Because it is a differential pressure type, pressure and temperature compensation are required. And these two compensation probes are more prone to damage than the flowmeter.
The range ratio of v-cone flowmeter is small, generally 1:10, good to 20. The electromagnetic energy generally reaches 100. Except for electromagnetic and thermal, other flowmeters have a lot of drop in measurement accuracy on small flow, or even can not measure.
V-Cone Flow Meter Installation
1.Pipeline flange type:
Refers to the installation flange at both ends of the flowmeter. It is connected with the installation flange (also called user flange) of the same specification at both ends of the process pipeline. It is a more commonly used structure.
The applicable caliber (DN50mm～3000mm). This form is suitable for split installation of throttling device and differential pressure transmitter. It is generally used when measuring steam flow. It can also be used when measuring other high-temperature media.
2.Flange clamping type:
Used for the installation of small-mouth flow meters. Only 2 flanges are required for each flowmeter process pipeline. The flange and the process pipeline are welded together. Then clamp the flowmeter between the two flanges. The installation method here is the same as that of the vortex flowmeter (≤300mm).
3.Small-caliber integrated type:
Suitable for fluids with a diameter of ≤DN40mm and a medium temperature of ≤120℃. The structure is to directly combine the differential pressure transmitter with the tower flow meter into a whole.
There is no pressure guiding tube, pressure taking valve, three valve group between the two. Make the installation very simple (the same as the vortex flowmeter installation method). When the differential pressure transmitter adjusts the zero point, the valve of the process pipeline needs to be closed, and then the zero can be adjusted.
Note: This installation method cannot be used to measure high-temperature media. It is because the high-temperature media will enter the measuring room of the differential pressure transmitter and damage the measuring diaphragm of the transmitter.
4.Pipeline butt welding type:
Refers to the tower flowmeter and the process pipeline cannot be connected by flange (the flowmeter body cannot be flanged). The flowmeter and the process pipeline are directly welded together during installation. The cost of this structure is relatively low (the cost of 4 flanges is reduced), and it is a one-time installation. Generally used in larger diameter occasions.
5.Conventional fluid integration type:
Refers to the fluid whose medium temperature is ≤120℃. Applicable pipe diameter: DN50～DN3000. According to different fluids and user requirements, the manufacturer welds (or assembles) valves and three-valve groups on the flowmeter before leaving the factory. The user can assemble the flowmeter and transmitter together when installing on site.
6.Steam integrated type:
It means to assemble the transmitter and the tower flowmeter together when measuring the steam flow. Between the transmitter and the flowmeter, we must assemble the “three-valve group dedicated for steam” of our company. So cancel The pressure guiding tube is greatly simplified and the pressure taking structure is greatly simplified.
7.Liquid antifreeze type:
Refers to the “liquid special isolation tank” installed by our company between the tower flowmeter and the transmitter. The tank contains a special medium, which can not freeze at a lower temperature. This installation method is used when measuring liquids, especially when the outdoor environment is relatively low. The liquid in the measuring chamber of the transmitter is easy to freeze and damage the transmitter.
8.Square pipe flange type:
Refers to the process pipe is a square pipe. The flow meter measuring pipe is a round pipe. The two are connected by a special “square-circle” connector.
Flange, clamp connection type
The V-cone flow sensor is a straight pipe section with flanges. The v-cone is placed inside the tube. Weld the same flange on the process pipe and assemble it with the v-cone flow sensor.
When the V-cone flow sensor is installed on a vertical pipe, the fluid should flow from bottom to top. Since the positive and negative pressure inlets are not on the same level, necessary corrections should be made to their heights.
Diameter range
Throttle
upstream
downstream
All
1 elbow
1D
1D
2 elbows
1D
1D
tee joint
1D
1D
Butterfly valve (control valve)
10D when not ideal
5D downstream of valve
Butterfly valve (stop valve)
5D
3D
Ball valve (cut-off)
1D
1D
Heat exchanger (depending on type)
1D
0D
Expanding tube (0.67D-D) length 2.5D
2D
2D
Reducer (3D-1D) length 3.5D
1D
1D
Welding type
The V-cone flow sensor can be permanently welded in the pipeline as a part of the pipeline because of its very good wear resistance and the fluid purging around the V-cone, making it self-cleaning.
Requirements for upstream and downstream straight pipe sections: Gas measurement, Reynolds number range (Re) > 200,000, β value greater than or equal to 0.65
Requirements for upstream and downstream straight pipe sections: Liquid measurement, Reynolds number range (Re)≤200,000, β value greater than or equal to 0.65
V-cone flowmeter, also known as; V-cone flowmeter; V-cone flowmeter; Cone flowmeter; Cone flowmeter; Inner cone flowmeter; Inner cone flowmeter.
Integrated V-cone flowmeter V-cone flowmeter (V-cone flowmeter) is a differential pressure flowmeter developed in the 1980s. Its successful development is a qualitative leap in differential pressure flow measurement. It uses the throttling effect produced by the V cone in the flow field to measure the flow by detecting the upstream and downstream pressure difference. V-cone flowmeter is mainly used for flow measurement of liquid, gas and steam. V-cone flowmeter is divided into two forms: integrated and split.
If you want to divide the flow meter into three categories. I think it can be divided into volumetric flowmeters, mass flowmeters, and velocity flowmeters.
There are differences in the measurement accuracy of commonly used flowmeters, as follows.
Mass flowmeter 0.05%, positive displacement flowmeter 0.25～0.5, electromagnetic flowmeter 0.25～1.0, turbine flowmeter 0.15～0.5, vortex flowmeter 0.1.5, ultrasonic flowmeter 0.1.0 (multi-channel is better than 0.5) , Orifice plate, V cone, uniform velocity tube flowmeter 1 to 1.5, nozzle 0.10.
Both the accuracy and error of a flowmeter characterize the ability of a measuring instrument to approximate the actual true value of the measurement results. The higher the accuracy of the instrument, the closer the measured value is to the actual true value. The higher the accuracy, the smaller the error.
Therefore, the accuracy of the mass flowmeter is currently the highest.
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A wide variety of V-cone flow meter options are available to you, such as free samples, paid samples.
Sino-Inst is a globally recognized supplier and manufacturer of V-cone flow meter, located in China. The top supplying country is China (Mainland), which supply 100% of the V-cone flow meter respectively.
Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. V-cone flow meter products are most popular in Domestic Market, Southeast Asia, and Mid East.
You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Wedge flow meter is a differential pressure flow meter. The detection part is a V-shaped wedge (also called a wedge-shaped throttle).
Wedge flowmeter is a new type of throttling differential pressure flow measuring instrument. The wedge flowmeter can perform high-precision flow measurement in fluids with high viscosity and low Reynolds number (Reynolds number 500 can be used). It has unparalleled advantages in flow measurement occasions with low flow rate, small flow and large pipe diameter. Except for general gas, liquid and steam, it is especially suitable for flow measurement of high-viscosity, dirty liquid and high-dust gas.
Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!
High accuracy, good stability and good repeatability. Measurement error: ±0.5%F.S; long-term stability: ±0.1%F.S/Y.
Simple structure, high reliability and long service life. The unique structure of the wedge flow sensor, the configuration of the high-performance differential pressure transmitter, and the strict degree of testing, testing and standardization. The service life can reach more than 10 years.
Wide measuring range. The range ratio is generally 1:25, up to 1:33. When the differential pressure of the differential pressure transmitter is changed, it can reach more than 1:100
The scope of application is extremely wide. It is not only suitable for single-phase fluids, but also for two-phase fluids such as gas-liquid, gas-solid and liquid-solid. Its Reynolds number can be as small as 300 and as high as 1×107. The wedge flow meter can work in the state of measuring flow or in the state of turbulent flow, and its lowest flow rate is 0.01m/s. It is suitable for the flow measurement of various liquids, gases, steam and high dust-containing gases such as high temperature, high pressure, high viscosity, heavy corrosion, easy crystallization, suspended solids, long fibers, etc.
Anti-adhesion, no deposition, no clogging. The anti-adhesion structure design of the wedge-shaped sensor measuring tube and the throttling piece eliminates the adhesion and accumulation of sand, dust, suspended solids, and fibers in the measured medium to the flow sensor measuring tube. At the same time, the corrosion of the measuring tube is prevented, thus ensuring the long-term constant of the measuring tube diameter and the long-term standard of flow measurement.
Integration. Integrated installation of wedge sensor, three groups of valves and differential pressure transmitter. Eliminates the need for pressure guiding pipelines, valves, pipe fittings, and the entire system is simpler. The measurement accuracy and reliability are greatly improved.
Intelligent. When selecting the intelligent differential pressure transmitter, the process parameters can be set and configured through HART protocol or other communication methods. According to the change of the measured medium flow rate, the differential pressure is adjusted to greatly broaden the system range. When the intelligent multi-parameter differential pressure transmitter is selected, multi-parameter measurement (differential pressure, volume flow, mass flow, pressure, temperature) can be realized. Realize complete temperature and pressure compensation, and directly output accurate flow signals.
Low installation requirements for straight pipe sections. Low requirements for installing straight pipe sections can effectively avoid and reduce the additional measurement uncertainty of the measurement system.
0.5 grade, 0.2, 0.3, 0.4 grade precision negotiated order
Long-term stability
±0.2%F.S/Y
Repeatability
±0.2%
Suitable test medium
Various liquids, gases and steam
Minimum flow rate
0.01m/s
Measuring range
Generally 1:25, up to 1:33, when the differential pressure of the differential pressure transmitter is changed. It can reach more than 1:100
Pressure loss
Measure about 1/5 of the differential pressure (about 1/3 of the orifice plate)
Reynolds number application range
The lower limit is 500, the upper limit is less than or equal to 1×10 7 (when measuring under low Reynolds number, the range is relatively reduced, and the uncertainty of the outflow coefficient is relatively increased)
Measured liquid viscosity
500mpa.s, or higher
Working pressure range
-0.1~42MPa
Range of working temperature
-160℃~450℃ (up to 700℃ for special)
Applicable pipe size
DN10mm~DN1200mm (special up to 2500mm)
Wedge ratio h/d
0.2, 0.3, 0.4, 0.5
Differential pressure/pressure transmitter power supply
The wedge flow meter can successfully measure the following fluids;
Gas: coal gas, natural gas (including high-humidity natural gas and unclean natural gas containing other impurities). Air (including air containing water, solid particles and other suspended matter).
Slurry (such as oil slurry, iron ore slurry, paper slurry, mud, coal Pulp, etc.).
Water (such as: purified water, sewage, industrial wastewater, river source water containing silt and debris, etc.).
Various aqueous solutions (such as: various acid, alkali, salt solutions with strong corrosiveness and easy crystallization , Solutions containing more suspended solids, etc.).
When the fluid flows into the flow tube, it is forced to accept the vertical movement of the flow tube. In the half cycle of the upward vibration of the flow tube, the fluid resists the upward movement of the tube and exerts a downward force on the flow tube.
On the contrary, the fluid of the wedge flow meter exerts an upward force on the flow tube to oppose the downward movement of the tube and reduce its vertical momentum. This causes the flow tube to twist. In the other half of the vibration cycle, the flow tube vibrates downwards and twists in the opposite direction.
It vibrates at its resonant frequency by driving the coil and the feedback circuit. The resonance frequency of the vibrating tube is related to the structure, material and quality of the vibrating tube. The quality of the vibrating tube consists of two parts: the mass of the vibrating tube itself and the quality of the medium in the vibrating tube.
After each sensor is produced, the quality of the vibrating tube itself is determined. The mass of the medium in the vibrating tube is the product of the density of the medium and the volume of the vibrating tube. The volume of the vibrating tube is fixed for each caliber sensor. Therefore, the vibration frequency is directly related to the density. For sensors that determine the structure and material, the density of the medium can be obtained by measuring the resonance frequency of the flow tube.
When using a wedge flow meter, if a small amount of gas flows in a stratified or wavy flow in the water pipe. The fault phenomenon is manifested as an increase in error, that is, the flow measurement value does not match the actual value.
If the flow is a bubble flow or a plug flow, the fault phenomenon is except that the measured value does not match the actual value. The output will fluctuate because the gas phase instantly covers the electrode surface.
If the cross-sectional area of the horizontal pipeline in the stratified flow increases in the gas phase. That is, the degree of liquid not full of the tube increases. There will also be output shaking, and the situation is more serious if the liquid is not full. If the liquid level is below the electrode, the output will be over-full.
Where qv—-volume flow meter, m³/s C——Outflow coefficient; ε—–Expansion coefficient; m——throttling area ratio; D——Inner diameter of pipe, m; △p——Differential pressure, pa; ρ——The density of the measured medium, kg/m³
The wedge flow meter has correction functions for parameters such as flow coefficient, non-linear error, temperature change, and density change. The measurement accuracy can reach 0.5%. Can have on-site display and standard current signal (4~20mA DC) output. It can be conveniently used in automatic control systems or networked with computers. Perform automatic adjustment and control of flow or other parameters.
Wedge flowmeter Vs V-cone flowmeter
The wedge flow meter is a new type of flowmeter that began to be practical in the 1980s. Its detection part is a V-shaped wedge (also known as a wedge-shaped throttling part), and its sleek top angle faces downward. It is conducive to the smooth passage of liquids containing suspended particles or viscous liquids, and no stagnant flow occurs on the upstream side of the throttle. Therefore, it is especially suitable for the measurement of volume flow and mass flow in petroleum and chemical industries.
Scope of application:
Suitable for measuring mud, coal tar pitch, coal water suspension and other high viscosity fluids;
In the case of a very low pipeline Reynolds number (even as low as Re=500), the square root relationship between flow and differential pressure can still be maintained. The minimum Reynolds number of the orifice flowmeter is much larger than that of the wedge flow meter;
Corrosive media can be measured. Because the differential pressure measurement uses a diaphragm type double-flange differential pressure transmitter, corrosive media cannot enter the pressure guiding tube and the differential pressure transmitter. Therefore, only the wedge-shaped throttling is processed by corrosion-resistant materials It can make the instrument measure corrosive media.
The V-cone flowmeter is a new type of differential pressure flow meter with high precision and high stability. Like other differential pressure meters, it is also based on the principle of flow continuity and Bernoulli’s equation to calculate the fluid flow rate.
Scope of application:
Because the V-cone flowmeter can uniform fluid distribution curve. Therefore, compared with other types of differential pressure flow meters, the requirements for the upstream and downstream straight pipe sections are small. It is recommended to leave 0-3D straight pipes upstream and 0-1D straight pipes downstream. When the user’s pipeline size is large, the pipeline price is high or the straight pipe section is not enough, the V-cone flowmeter will be the best choice.
So to sum up, there are differences in the scope of application of wedge flow meter and v-cone flowmeter. The former can maintain the square root relationship between flow and differential pressure at very low pipeline Reynolds number. The latter can be used when the pipe size is large or the straight pipe section is not enough.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
The high temperature flow meter is a welded orifice flow meter. Suitable for high temperature and high pressure steam flow and high pressure flow water measurement.
The nozzle of the temperature and high pressure welding orifice plate adopts the standards of the Ministry of Water Resources and Electric Power. The standard is (DG0700-DG0750). Welded integrated orifice plates for high temperature and high pressure are mainly used for measuring orifice plates for high temperature and high pressure steam flow and high pressure flowing water in power plants.
Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!
Features of High pressure and High temperature flow meter
The experimental research and data accumulation are abundant, supported by national standards.
Wide range of differential pressure used.
The pipe diameter has a wide range of use.
The measurement accuracy is high and the range is wide.
It can be applied to various working conditions such as high temperature, high pressure and ultra-low temperature.
Can be applied to various materials.
Digital display on site, compatible with remote signal transmission.
It is suitable for a wide range of media, and can measure the flow of various liquids, gases and steam.
Simple manufacturing and convenient installation.
The pressure loss of the welded orifice plate is about half of the differential pressure.
Welding Orifice Plate|High pressure and High temperature flow meter Specification
Nominal diameter: 25mm≤DN≤2400mm Nominal pressure: PN≤42Mpa Working temperature: -50℃≤t≤550℃ Aperture ratio: 0.10≤β≤0.75 Reynolds number range: when 0.10≤β≤0.56, 5000≤ReD When 0.45≤β≤0.75, 10000≤ReD Accuracy: Class 1.0, Class 1.5, Class 2.0
Please note: high temperature flow sensor is customized ,not standard type. If you need to measure high temperature, please contact Sino-Inst sales engineer.
The High Temperature Flow Meter uses a split signal converter. The way the vortex body is separated from the vortex converter. The Vortex Split High Temperature Flow Meter is suitable for high temperature, high pressure, safety and explosion-proof applications, where you need to watch the meter data on site. It is widely used in the measurement of steam, gas and liquid. And inconvenience Under complex conditions of reading data.
The thermal gas mass flow meter is designed based on the principle of thermal diffusion, which uses the constant temperature difference method to accurately measure the gas. The sensor part consists of two reference grade platinum resistance temperature sensors. Thermal gases are widely used in factory compressed air, blast furnace gas measurement in ironworks, and monitoring and measurement of chimney flue exhaust.
The clamp-on ultrasonic flowmeter composed of wall-mounted host and clamp-on flow sensor can be widely used in various water treatment industries. Applied to online measurement of various liquid volume flow. The main unit and the sensor are installed separately: the sensor is installed on the pipeline, the wall-mounted main unit is installed indoors or in the instrument box, and the main unit and the sensor are connected with an ultrasonic special cable. It is currently the most widely used ultrasonic flowmeter.
Magnetic Water Flow Meter provide highly accurate flow measurement for a wide variety of conductive fluid applications. Magnetic Water Flow Meter is a volumetric flow meter that measures liquids or liquid slurries that have a minimum conductivity of 5 µS/cm. Based on Faraday’s law of electromagnetic induction. Magnetic Water Flow Meter is ideal for wastewater applications or any dirty liquid which is conductive or water based. It is widely used in water treatment, environmental protection sewage measurement and control, papermaking and other industrial and agricultural production processes for flow measurement and control.
Liquid turbine flow meter is the main type of impeller type flow (velocity) meter. It is composed of sensors and conversion display. The sensor uses a multi-blade rotor to sense the average flow rate of the fluid, thereby deriving the flow or total amount. Liquid turbine flow meter is suitable for measuring liquids that are not corrosive to stainless steel 1Cr18Ni9Ti, 2Cr13 and corundum Al2O3 in closed pipelines and are free of impurities. For milk, soybean oil, edible oil, diesel, purified water.
High temperature air flow meter
You may have questions, what flowmeter can measure the air flow at ultra-high temperature?
For example, 800°C air.
Perhaps, you should use a V-cone flowmeter.
It is suitable for the measurement of various liquids, gases and steam under all working conditions and temperatures below 1330 degrees.
V-cone flow meter is also known as cone-type flow meter; inner cone flow meter; integrated V-cone flow meter. The principle of V-cone flow meter is the same as other DP flow meters, and it is also a throttling DP flowmeter.
The basic principle of the V-cone flow meter is the same as that of other types of differential pressure flowmeters. They are based on the principle of energy conservation in the sealed pipeline. The V-cone flow meter is a cone-shaped shutoff piece suspended in the center of the pipeline, and the cone-shaped piece hinders the flow of the medium. Reshape the flow rate curve. Measuring media include water, steam, air, natural gas, nitrogen, coke oven gas, etc. The maximum working temperature is 450℃, and the maximum pressure is 40Mpa.
Sino-Inst offers High pressure and High temperature flow meters.
A wide variety of High pressure and High temperature flow meter options are available to you, such as brass, carbon steel. You can also choose from free samples.
Sino-Inst is High pressure and High temperature flow meter supplier. High pressure and High temperature flow meter products are most popular in Domestic Market, Southeast Asia, and Mid East.
You can ensure product safety by selecting from certified suppliers, including 375 with ISO9001, ISO14001, and Other certification.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
DP Flow Meter includes throttling parts (eg. orifice plates), differential pressure transmitters, three-way valves. Used for flow measurement of various liquids, gases and steam.
Integral DP Flow Meter installs the throttle, differential pressure transmitter, three-way valve and accessories on the short process pipe. It is supplied as a whole after calibration. Reduce installation errors. Shorten installation man-hours. There is no need to connect additional pressure measuring points and temperature measuring points to make the output signal. Automatically realize temperature and pressure compensation to improve measurement accuracy.
Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!
Because the integrated differential pressure flowmeter does not require a pressure pipe, the phenomenon of differential pressure distortion is reduced. It has higher accuracy than the split differential pressure flowmeter. For differential pressure flow meters that require real flow calibration. Because it is the flow calibration of the whole device. So the system accuracy can be improved by 0.3%.
b. Simple installation
The integrated differential pressure flowmeter only needs to be flanged or directly welded to the phenomenon pipeline. And directly lead to the current signal of the differential pressure transmitter. There is no need to lay additional pressure pipelines and install differential pressure transmitters.
Used to measure the flow of gas or steam. Due to the optional multi-parameter differential pressure transmitter. It can automatically monitor temperature and pressure changes and automatically trim the output signal. So there is no need to install additional temperature and pressure measuring elements. Greatly improve the installation progress.
c. Wide range ratio
The integrated differential pressure flowmeter with multi-parameter differential pressure transmitter is equipped with dynamic algorithm compensation. So the turndown ratio is greatly improved. The large range can reach 8:1.
d. Low purchase, installation and operating costs
The integrated differential pressure flowmeter does not need to lay additional pressure pipeline. And there is no need to heat the impulse pipeline. Therefore, the installation cost is greatly saved. Adapt to the severe cold area in winter or occasions requiring heat preservation.
For the integrated differential pressure flowmeter with multi-parameter differential pressure transmitter, it integrates temperature and pressure compensation. Therefore, the purchase cost of pressure and temperature transmitters is eliminated. Greatly reduce the cost of purchasing and installation.
e. Variety of forms
Because the primary element can use different forms of throttling devices. Therefore, as long as the appropriate integrated differential flowmeter is selected for various operating conditions. It can realize the accurate flow of any kind of complicated working conditions.
Single-phase fluid such as liquid, gas, steam (or can be considered as single-phase fluid)
temperature range
－40℃～450℃
Pressure range
2.5MPa (4.0MPa)
Throttle
Preferred fixed-value ISA1932 nozzles (the preferred serial number β20 for fixed-value aperture is 0.52 and 0.72), fixed-value orifice plate (the preferred serial number β20 for fixed-value aperture is 0.34, 0.52 and 0.72)
Pressure method
Angle joint pressure or flange pressure
Differential pressure transmitter
PMD230, 1151, 3051CD, 3095CD, EJA110A
Range
3:1, 6:1, 10:1, 10:1 or more
System uncertainty
±1.0%, ±1.5%, ±2.0%, ±2.5% (The accuracy of the system is affected by many factors. Our company can provide you with relevant consulting services)
Throttle material
1Cr18Ni9Ti, SUS316, others
Material of clamp
1Cr18Ni9Ti, SUS316, 20# steel, others
Power supply
Transmitter part 24VDC (20mA) Flow display equipment: 220VAC, 50Hz 24VDC
4-20mA (communication connection requires a minimum load resistance of 250W)
Protection level
IP65
Allow vibration acceleration
£1.0g
Ambient temperature
－20℃～55℃ (please declare if it exceeds this range)
environment humidity
45%～85%
Atmospheric pressure
86～106kPa
DP Flow Meter Working Principle
The fluid filled with the pipe flows through the throttling device in the pipe, and the stream will form a local contraction at the throttling part. As a result, the flow velocity will increase and the static pressure will decrease. So a static pressure difference (or differential pressure) is generated before and after the throttling part.
The greater the flow rate of the fluid, the greater the differential pressure generated before and after the throttle. Therefore, the flow can be measured by measuring the differential pressure.
Knowing the relevant parameters. According to the principle of flow continuity and Bernoulli equation, the relationship between the differential pressure and the flow rate can be derived1 to obtain the flow rate. The basic formula is as follows:
c——outflow coefficient dimensionless
d——The diameter of the orifice or throat of the throttle under working conditions m
D——Inner diameter of upstream pipe under working conditions m
The differential pressure flowmeter is an instrument for measuring flow. It uses the principle that there is a certain relationship between the pressure difference and the flow rate generated when the fluid flows through the throttling device. The flow rate is measured by measuring the pressure difference.
The throttling device is a local constriction element installed in the pipeline. The most commonly used are perforated plates, nozzles and venturi tubes.
How is DP flow calculated?
Flow calculation formula 1: The conversion of the relationship between the differential pressure and the flow rate of the differential pressure flowmeter
The differential pressure of a differential pressure flowmeter is proportional to the square of the flow rate. In other words, the flow rate is proportional to the square root of the differential pressure. It is expressed by the following formula:
The scale unit of the flow meter is the flow percentage. The lower limit of the differential pressure is 0 o’clock.
In the above formula: △P is any differential pressure; Q is any flow; △Pmax is the upper limit of differential pressure; Qmax is the upper limit of the flow rate; n is any percentage of flow
Flow calculation formula 2: Conversion of volume flow in standard state and working state
The conversion formula of volume flow between standard state and working state is as follows:
In the formula, qv is the volumetric flow rate under working conditions, in m3/h; qn is the volume flow under standard conditions, in m3/h; P is the absolute pressure under working conditions, the unit is Pa; Pn is the absolute pressure in the standard state, in Pa; T is the thermodynamic temperature under working conditions, in K; Tn is the thermodynamic temperature in the standard state, in K; Z is the gas compression coefficient under working conditions; Zn is the gas compressibility coefficient under standard conditions;
Flow calculation formula 3: Calculation of changing range from standard orifice plate
Sometimes it is encountered in the field that the measured flow exceeds the maximum range of the orifice plate. Or the flow rate is too small and can only be displayed below 30% of the maximum range. The emergency can be met by expanding or reducing the differential pressure range.
The basis for changing the range is the formula. The maximum differential pressure and maximum flow rate of the flowmeter in use are known. With these two parameters combined with the flow calculation formula, the calculation work for changing the range can be carried out.
Difference between integrated DP flow meter and general DP flowmeter
A general differential pressure flow meter includes two parts: a throttle and a differential pressure transmitter. The installation requires a pressure pipe system to connect the two.
The integrated differential pressure flowmeter directly assembles the throttling piece, the pressure pipe system and the differential pressure transmitter. At the same time, the integrated differential pressure flowmeter depends on the product. It can have both pressure and temperature measurement functions, temperature-pressure compensation functions, etc., all integrated in one device.
DP Flow Meter Straight Run Requirement
The accuracy of flow measurement has a lot to do with whether the installation of the differential pressure flowmeter meets the requirements. The general requirements are as follows:
When installing, it must be ensured that the opening of the throttling piece is concentric with the pipe. The end face of the throttling piece is perpendicular to the axis of the pipe.
There must be a certain length of straight pipe section upstream and downstream of the throttle.
Orifice flowmeter requires 10D front and 5D rear
V-cone flowmeter requires 5D in the front and 1-3D in the back
The elbow flowmeter is installed on the elbow.
What Is Integral Orifice Plate?
The main function of the orifice is to reduce the pressure of the fluid. But it does not mean that it can be mixed, and the orifice plate should be selected according to the specific medium.
The integrated orifice flowmeter is a high turndown differential pressure flow device composed of a standard orifice plate and a multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter and pressure transmitter). It can measure the flow of gas, steam, liquid and natural gas. It is widely used in process control and measurement in the fields of petroleum, chemical industry, metallurgy, electric power, heating, water supply and so on.
The integrated orifice device is simpler. No pressure tube is required. It can be directly connected to differential pressure transmitter and pressure transmitter.
Orifice plate flow meter works together with an orifice plate, differential pressure transmitter, with Differential Pressure Measurement principle. Easy installation. Orifice plate flow meters can be used with gases, liquids, corrosive, and high temperature fluids. Orifice flow meters can measure steam, gas, liquids, and many industrial areas. Applications include steam flow, boiler feedwater, and fluid flow rates in building water lines. Read more about: Condensate Flow Meter-Steam Condensate Flow Meter|Types & Selection Guide
The flow rate measured by the differential pressure transmitter is determined based on the maximum differential pressure of the fluid provided by the flow detection orifice or the venturi tube. That is, the maximum range of the differential pressure transmitter.
For example, in the design data provided by a certain orifice or venturi tube. When the maximum fluid flows through, the maximum differential pressure generated is a certain value. This value is the range of the differential pressure transmitter.
Due to the change of fluid volume, the differential pressure does not show a linear relationship. But the differential pressure transmitter does not compensate and calibrate the non-linearity of fluid/differential pressure. This is corrected by the secondary instrument. Or it can be corrected by PLC or DC.
Differential pressure refers to the pressure difference between two parts of the process equipment. The pressures of these two points may be gauge pressure or negative pressure. In fact, it is the pressure difference between the gauge pressure or negative pressure of two parts of the process equipment. The negative pressure (vacuum degree) refers to the atmospheric pressure line as a reference, and the pressure below atmospheric pressure is the negative pressure (vacuum degree).
In the production process, the gauge pressure is generally a true reflection of the pressure of a certain part of the process equipment. Allows the operator to monitor and grasp the pressure changes in the production process at all times. In order to save time and deal with emergencies in the production process in a timely manner.
For differential pressure, know the pressure of two parts of the process equipment. Through the pressure difference, you can know the actual flow rate of the fluid or the pressure difference or understand the level of the fluid in the container.
What are the main categories of orifice flowmeters?
Here is an introduction to its classification:
Eccentric orifice plate. Pressure method: corner connection pressure. Eccentric orifice plate and round orifice plate are only suitable for installation on horizontal or inclined pipes, and cannot be used on vertical pipes.
Built-in orifice plate. This type of orifice plate is made into an integrated orifice plate and measuring tube. It is generally used for small pipe diameters (DN≤50mm). So it is also called small pipe diameter orifice plate.
Standard orifice plate. The standard orifice plate is a standard throttling device with the most specifications, which is widely used in various fluids, especially gas flow measurement. The structure of the orifice plate is different due to the pressure, diameter, and pressure taking method. . The standard orifice plate can be divided into three types: corner connection pressure, flange pressure, and radial distance pressure according to common pressure methods.
Round orifice plate. Pressure method: flange pressure. More flowmeter information is available in the long-term control instrument.
The orifice flowmeter is a liquid and gas flow measurement instrument. The function of the orifice flowmeter is mainly used to measure the flow rate. Like typical steam flow measurement, hot air flow measurement and heat transfer oil flow measurement. These are all It is measured by an orifice flowmeter. Due to the high measurement temperature on site, ordinary measuring instruments cannot be used. Only differential pressure flowmeters can be used for measurement.
Orifice flowmeter is suitable for which fields? This needs to be based on the advantages of orifice flowmeter. Orifice flowmeter is a high temperature and high pressure flow measurement instrument. According to this advantage, it is more suitable for high temperature and high pressure flow. Measurement. Of course, it can solve almost all fluid medium measurement. It is a widely used differential pressure flow meter.
The accuracy of the orifice flowmeter can reach 0.5 level. What is this concept? The error of measuring 1000 tons of flow is 5 tons. The daily production of this precision industry fully meets the use.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
A throttling device is also called a throttling flowmeter. A typical differential pressure flow meter. Commonly used to measure the flow of gas, liquid and steam in industrial production.
Throttling device is a flow device in which the fluid filled with the pipe flows through the pipe. The stream will form a local contraction at the throttling. This will increase the flow velocity and reduce the static pressure. So a differential pressure is generated before and after the throttling ( Or called throttling flowmeter).
Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!
The throttling device has the advantages of simple structure, firmness, reliable work, stable performance, high degree, and low price. Therefore, the amount of throttling device has an advantage compared with other flow meters.
Wide range of pipe diameter, φ2～φ3000mm (or larger). The cross-sectional shape, round or rectangular shape is acceptable.
The standard throttling device can determine its measurement degree without real flow calibration.
Applicable to a wide range of tested media. It can be used for almost all gas, steam and liquid flow measurement.
The working pressure can be as high as 32Mpa. Can also be used for negative pressure.
Medium temperature range: -l85～+650℃. Other flowmeters are not yet possible.
The structure of non-standard throttling device is diverse. Almost applicable to various fluid flow measurement.
The flow range can be changed on site by setting the range of the differential pressure transmitter.
It is simple to use, operate, easy to master, and daily maintenance is small.
The throttling device consists of throttling parts (such as orifice plate, nozzle, etc.). Pressure Sensors, fastening devices (flanges, bolts, nuts, gaskets, etc.), and other accessories (pressure guiding tubes, stop Valve, etc.). It can also be equipped with front and rear measuring tubes and flanges at both ends of the straight pipe section.
Note: The current limiting orifice has no such representation method
Diameter
Code
2
3
4
5
6
8
10
12
15
17
20
22
25
Diameter (mm)
25
32
40
50
65
80
100
125
150
175
200
225
250
Code
27
30
32
35
37
40
45
50
60
70
80
90
99
Diameter (mm)
275
300
325
350
375
400
450
500
600
700
800
900
1000
Pipe diameter greater than 1000 is expressed as 1/10 of the actual pipe diameter
Nominal pressure
Code
0
1
2
3
4
6
10
16
20
25
32
40
Nominal pressure(Mpa)
0.6
1
1.6
2.5
4
6.4
10
16
20
25
32
42
The special nominal pressure is filled in according to the actual design pressure value
Supply method
Code
Supply content
A
Complete device with front 10D and rear 5D measuring tubes (including connecting flange and process flange)
A1
Complete device with front 10D and rear 5D measuring tube (including connecting flange)
A2
Complete device with front 10D and rear 5D measuring tube (pipe end inverted bevel)
B
A complete set of equipment with upstream and downstream measuring tubes (including process flanges) according to petrochemical standards (HGJ516-87)
B1
According to the petrochemical standard (HGJ516-87), a complete set of equipment with upstream and downstream measuring pipes (pipe end inverted bevel)
B2
According to the petrochemical standard (HGJ516-87), a complete set of equipment without upstream and downstream measuring tubes
C
According to the standard of the Ministry of Electric Power (GD87-1101) a complete set of equipment with upstream and downstream measuring tubes
D
Flanges, ring chambers or pressure-taking flanges, throttles, pressure pipes, fasteners and other complete sets of devices without measuring tubes
The principle of Throttling Device flow measurement
The throttling device artificially causes throttling in the pipeline through which the medium circulates (as shown in the figure). When the measured medium flows through the throttling device, it causes a local contraction. The stream is concentrated, the flow velocity increases, and the static pressure decreases.
As the most important branch of the flow meter, the throttling device is divided into two categories: standard throttling devices and non-standard throttling devices.
Standard throttling devices include: standard orifice plate, ISA standard nozzle, long neck nozzle, classic venturi tube and venturi nozzle;
Orifice plate flow meter works together with an orifice plate, differential pressure transmitter, with Differential Pressure Measurement principle. Easy installation. Orifice plate flow meters can be used with gases, liquids, corrosive, and high temperature fluids. Orifice flow meters can measure steam, gas, liquids, and many industrial areas. Applications include steam flow, boiler feedwater, and fluid flow rates in building water lines.
Sino-Inst offers Throttling Devices. A wide variety of Throttling Device options are available to you, such as brass, carbon steel. You can also choose from free samples.
Sino-Inst is an Throttling Device supplier. Orifice plate flow meter products are most popular in Domestic Market, Southeast Asia, and Mid East.
You can ensure product safety by selecting from certified suppliers, including 375 with ISO9001, ISO14001, and Other certification.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Differential Pressure Flow Meter is also called DP flow meter. Differential pressure flow meters use the principle of differential pressure to measure the flow of liquid, gas and steam.
The differential pressure flow meter is measured by the working principle that there is a certain relationship between the pressure difference and the flow rate when the medium fluid flows through the throttling device. Differential pressure (DP) flow meters are the most widely used form of flow measurement products today. Including: integrated orifice flowmeter, average velocity tube flowmeter, venturi tube, wedge flowmeter, underwater flowmeter, orifice plate, orifice carrier assembly, nozzle flowmeter.
Sino-Inst offers a variety of DP flow meters for flow measurement. If you have any questions, please contact our sales engineers.
Differential pressure flow meter advantages and disadvantages
Advantages of differential pressure flowmeter
Wide range of applications. There is no other type of flowmeter comparable to a differential pressure flowmeter.
The orifice plate is the most widely used differential pressure flow meter. It has a firm structure, stable and reliable performance and long service life.
The detection parts, differential pressure transmitter, and flow totalizer can be produced by different manufacturers. It is convenient for scale economic production
Disadvantages of differential pressure flowmeter
The measurement accuracy of differential pressure flow meters is generally low.
The range is narrow, generally only 3:1-4:1
Different pressure flow meters require high on-site installation conditions.
The pressure loss of orifice plate and nozzle is large.
Differential pressure flow meter working principle
When the fluid flows through the throttle, the fluid will be accelerated due to the fluid being compressed.
As the velocity of the fluid increases, the kinetic energy of the fluid will increase accordingly.
According to the law of conservation of energy, we know that the static pressure of the fluid being accelerated will reduce the corresponding value.
As the picture shows:
The cross-sectional area of the pipe at cross-section 1 is A1. The average flow velocity of the fluid when flowing through the cross section A1 is V1. Its density is ρ1.
When the fluid flows through cross section 2. The average flow rate of the fluid becomes V2. The density is ρ2. The cross-sectional area is A2.
According to the principle of fluid flow continuity, there is the following relationship: V1×A1×ρ1=V2×A2×ρ2.
If the fluid is a liquid, the density of the fluid before and after compression is generally considered constant. That is, ρ1=ρ2=ρ.
Therefore, the volumetric flow rate of the liquid: qv=V1×A1=V2×A2 ——–Formula①
According to the Bernoulli equation (i.e. the law of conservation of energy), Z1=Z2 on a horizontal pipe, then the following relationship is given: —————Formula②
Applying the Bernoulli equation and the principle of flow continuity, there are the following relations on the two cross sections:
——————Formula ③
From formula ①, we get: V1=A2/A1×V2; put formula ① and formula ② into formula ③ to get:
———————Formula④
In the above formula: A1=(πD2)/4, A2=(πd2)/4, according to the definition of the diameter ratio according to the diameter ratio β: β=d/D. From formula ①, we can get: V2=qv/A2
Therefore: The theoretical flow formula can be derived from this:
————————–Formula ⑤
Also defined by the outflow coefficient C is: C=actual flow/theoretical flow, Finally, the calculation formula of differential pressure flowmeter can be obtained:
–————————-Formula ⑥;
The expansibility coefficient of ε measured medium in formula ⑥, generally speaking ε=1 for liquid.
It can compress fluid ε<1 for gas, steam, etc. qv is the volume flow of the fluid, unit: m3/s). ρ1 is the density of the fluid upstream of the throttle (front) under working conditions, in kg/m3. d is the equivalent opening diameter of the throttle under working conditions, unit: m. △P is differential pressure, △P=P1-P2, unit: Pa.
The selection of differential pressure flowmeter should consider the following aspects:
1.Accuracy, repeatability, linearity, flow range and range
The standard parts of the differential pressure flowmeter have a strict range of use. These parameters include pipe diameter ratio, Reynolds coefficient, pipe wall thickness and other parameters.
Therefore, these series of parameters should be selected reasonably in actual selection and application. In addition, the accuracy of the differential pressure flowmeter depends to a large extent on the conditions of use on site, and generally depends on the conditions of the fluid.
2.Fluid characteristics
The characteristics of the fluid refer to the fluid’s medium conditions such as density, dynamic viscosity, pressure, temperature, corrosivity, abrasion, fouling, and dirt. Therefore, the selection is a differential pressure flowmeter that should be reasonably selected according to the physical characteristics of the fluid medium on site. If you do not understand the physical characteristics of the fluid on site, you should actively use the instrument to measure these physical parameters.
3.Economic factors
Should consider the purchase cost of differential pressure flowmeter. Installation costs and after installation. Later maintenance costs. Calibration fee. The later operating cost of the larger diameter differential pressure flowmeter is a relatively large expense. Therefore, the proper caliber differential pressure flowmeter should be selected when selecting the model.
4.Pressure loss
Large pressure loss is one of the main disadvantages of differential pressure flow meters. Orifice plates and nozzles in various throttling devices are throttling parts with large pressure loss. At the same flow rate and β value, the pressure loss of the nozzle is only 30%-50% of the pressure loss of the orifice, which means that the nozzle has a lower pressure loss.
Various flow tubes (Venturi tube, Dole tube, Rollos tube, general Venturi tube, etc.) are throttling devices with low pressure loss. Their pressure loss is only 20% of the orifice plate, even as low as 5%-10%. The development and application of these throttling devices is a direction for future efforts.
Differential pressure flow meters are one of the most widely used types of flow meters. Sino-Inst analyzed the working principle and selection of differential pressure flow meters. It provides a certain theoretical reference basis for the selection and use of differential pressure flow meters in the future.
Sino-Inst, Manufacuturer for differential pressure flow meters. Including Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas and steam flow measurement.
Sino-Inst’s differential pressure flow meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
The target flow meter is also known as the drag force flow meter. Insert a target (drag element) into the flow field. Measure the drag force on the inserted target and convert it to the flow velocity.
The target flow meter is also called a drag force flowmeter. The target flow meter inserts a target (drag element) into the flow field. The target usually is a flat disc or a sphere with an extension rod. There will be a differential pressure. And then target flow meters measure the drag force on the inserted target and convert it to the flow rate. Sino-Inst manufactures target flow meters for liquid, gas, and steam measurement.
Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!
Sino-Inst offers a Capacitive target flowmeter. A capacitive target flowmeter is a new type of capacitive force inductive flowmeter. Developed on the basis of traditional target flowmeter. And developed with new sensors and microelectronic technology. It has both orifice plate and vortex flowmeters.
The characteristics of no moving parts. High sensitivity, accuracy comparable to volumetric flow meters, and a wide range. The use of a chip-level capacitive force sensor and an efficient anti-overload structure design are the key cores for the new product to achieve high precision and high stability.
In addition, it has unique anti-interference and anti-impurity performance. Our capacitive target flow meters can replace the conventional flow measurement. It has good adaptability to difficult flow measurement conditions. Such as high viscosity, dirty media, easy to set and block, high temperature, low temperature, and strong corrosion.
It is widely used in petroleum, chemical industry, metallurgy, power. Pharmaceutical, environmental protection, food and other fields.
The target flow meters are applicable to the following ranges:
Diameter ,Φ15~Φ2000mm or bigger.
High and low temperature, -196°C~+450°C.
High pressure : 0~42Mpa.
Suitable for various media: gas, liquid (including high viscosity liquid, slurry), steam;
It is suitable for low-velocity media, and its minimum measurable flow rate is 0.08m / s.
Target Flow Meter Construction
The capacitive target flowmeter is mainly composed of a measuring tube (housing), a new capacitor.
It consists of a force sensor, chokes, integrated display, and output.
Target Flow Meter Construction
Features of Target Flow Meters
The whole instrument has a solid structure without moving parts, easy to disassemble.
Can choose a variety of anti-corrosion. And high and low temperature resistant materials (such as Hastelloy, titanium, etc.);
The whole machine can be made fully sealed without dead corners (welded form). Without any leakage points, and can withstand 42MPa high pressure;
Small pressure loss, only about 1/2 △ P of standard orifice plate;
Strong anti-interference and anti-impurity capabilities;
The instrument has a self-checking program. And the failure phenomenon is clear at a glance;
The sensor is not in contact with the measured medium, there is no component wear, and it is safe and reliable to use;
Dry calibration method can be used in situ, that is, weight hanging method. One-button operation can complete the calibration;
There are multiple installation methods to choose from. Such as online plug-in, low installation costs;
With integrated temperature and pressure compensation, direct output quality or standard square;
Optional small signal removal, non-linear correction, and filtering time can be selected;
It can accurately measure the gas and liquid flow under various normal temperature. High temperature 500 degrees, and low temperature -200 degrees;
Accurate measurement, accuracy can reach 0.2%;
Good repeatability, generally 0.05% to 0.08%, fast measurement;
Can change the range of resistance (target) according to actual needs;
Low-power battery on-site display, can directly read the displayed value online. And the display can read the instantaneous and cumulative flow and percentage bar graph at the same time;
Simple and convenient installation and extremely easy maintenance;
Multiple output formats, which can transmit various parameters remotely;
Strong vibration resistance, pulsating flow can be measured within a certain range.
Target flow meters types
Plug-in target flowmeter
Pipeline (flange) target flowmeter
Wafer type target flowmeter
Clamp type (sanitary) target type flowmeter
Jacketed thermal target flowmeter
Threaded target flowmeter
Technical Data of Target Flow Meter
Item
Target flowmeter Performance, Parameters
Medium
Liquid, Gas, and Steam
Caliber
Pipe type 15~300mm Clamp type 15~600mm Plug type100~2000mm
Pressure
0.6~10MPa 0.6~42MPa 0.6~42MPa
Accuracy
± 0.2 ~ ± 1.5%FS
Medium Temperature
-196° C~+450° C ( Confirming the temperature range before purchase)
Media temperature
-20 ~ +70 (normal temperature type) -196 ~ +700 (high/low temperature type)
Precision
± 0.2% ± 0.5% ± 1.0% ± 1.5% ± 2.5%
Range
1: 3 1: 5 1: 10 1: 10 1: 10(Steam)
Compensation
Temperature compensation; Pressure compensation
Repeatability
0.1%~0.08%
Power Supply
3.6V lithium battery, 24V DC
Output
LCD display, and 4~20mA, 0~10V, impulse or RS485 (Optional)
Material of measure tube
Carbon Steel; 304; 316L; Being able to provide other according to user requests
Explosion- Prevent Symbol
ExiallCT4, ExiallBT4
Protection Rank
IP65; IP67
Features
* Installation is simple and convenient, easy to maintain * A variety of output forms, spread far and wide variety of parameters * Anti-vibration is strong, within a certain range can be measured pulsatile flow * Anti-jamming, anti-contamination ability to exceptionally strong
Advantages of Target flow meters:
They are useful for difficult measurements. Such as slurries, polymer bearing and sediment-bearing materials corrosive mixtures, etc.
They provide good accuracy when calibrated for specific streams.
They are good for relatively high temperatures and pressures.
Low initial set up cost
Can be used with a wide variety of fluids, even viscous fluids and slurries.
Can be used in abrasive, contaminated, or corrosive fluid flow
Can be made to measure flow velocity that is sporadic or multi-directional with sphere drag element designs
Can be used for any type of liquid, gas, or steam cryogenics.
There is no moving parts such as bearings, to wear out causing failures.
High reliability where life tests have been made to 20,000,000 cycles.
Can be used for any line size from 0.5 inches and up with any type of mounting.
Range/fluid changes accomplished by simply changing targets.
Turndowns aprox.15:1
Several materials are available. Among them 303/304 SS, 316 SS, hastelloy and inconel.
Disadvantages of target flow meters:
Calibration must be verified in the field.
Pressure drop is inevitable due to the rod and the drag element
In-line mounting required in these flowmeters.
They have a limited calibration data.
In case of target flowmeters no-flow conditions must exist for zeroing
Be careful when operating target flowmeters low in their flow range. Because accuracy can be compromised at these flow rates.
Avoid abrasive fluids. Because the target can be damaged and measure inaccurately.
Fluids that coat the target can cause it to become heavy. Such that the force measurement can become inaccurate and unresponsive to flow changes.
These flowmeters should not be applied to slurries and high viscosity liquids.
Calibration is an important part of ensuring accurate operation of target flowmeters.
Pressure effects, physical effects, and flowmeter orientation can affect the zero adjustment of target flowmeters.
After calibrating the target flowmeter (typically with weights), be sure to zero target flowmeters after installation with a full pipe under no flow conditions. To ensure compensation for these effects in the final installation.
This procedure also compensates for the calibration shift that can occur when the orientation of the flowmeter during calibration is different than its installed orientation.
In general, in-situ zero adjustment should be performed after re-installing target flowmeters.
Operating a target flowmeter above its maximum flow rate can cause the calibration to shift and potentially damage the suspension system of the flowmeter.
Note also that operating target flowmeters continuously for extended periods of time can cause a mechanical shift to occur that can affect the zero. Because the target may not return to exactly the same position after being exposed to forces over time.
Rapidly changing flow, such as slug flow conditions, two-phase flow, and start-up conditions (gas to liquid transitions). Can similarly affect the mechanics of the target flowmeter and hence its zero. Therefore, it is advisable to periodically verify the zero adjustment of target flowmeters.
When the medium flows in the measuring tube, the pressure difference caused by its own kinetic energy passing through the blocking member (target). And has a force on the blocking member. The magnitude of the force is proportional to the square of the velocity of the medium.
The mathematical way is as follows: F = CdAρ • V2 / 2
In the formula: F —— the force of the choke (kg) Cd-object resistance coefficient A ——Axial projection area of the choke on the measuring tube (mm2) ρ ——Density of medium under working conditions (kg / m3) v-average flow velocity of the medium in the measuring tube (m / s) The force F received by the choke member (target) is transmitted to the capacitive force sensor via a rigidly connected transmission member (stem).
And the capacitive force sensor generates a voltage signal output: V = KF In the formula: V——Voltage output by the capacitive force sensor (mV), K——Proportional constant, F——The acting force of the choke (target) So, after the voltage signal is pre-amplified, AD converted. And processed by the computer. The corresponding instantaneous flow and cumulative total can be obtained.
How Target Flowmeters Work
Target flowmeters measure flow by measuring the amount of force exerted by the flowing fluid on a target suspended in the flow stream.
The force exerted on the target by the flow is proportional to the pressure drop across the target.
Like differential pressure flowmeters. Bernoulli’s equation states that the pressure drop across the target (and hence the force exerted on the target) is proportional to the square of the flow rate.
Using this relationship, 10 percent of full scale flow produces only 1 percent of the full scale force.
At 10 percent of full scale flow, the target flowmeter accuracy is dependent upon the transmitter being accurate over a 100:1 range of force.
Transmitter accuracy is typically degraded measuring low forces in its range, so flowmeter accuracy can be similarly degraded.
So, this non-linear relationship can have a detrimental effect on the accuracy and turndown of target flowmeters.
Remember that of interest is the accuracy of the flow measurement system — not the accuracy of the transmitter.
How to Use Target Flowmeters
Target flowmeters inferentially measure the flow of liquids and gases. Such as water, air, industrial gases, and chemicals.
Be careful using target flowmeters on fluids that can coat the target. Because the flowmeter accuracy can be degraded.
This flowmeter can be applied to sanitary, cryogenic liquids, relatively clean, and corrosive liquids.
Thematerials of construction of all wetted parts, including the flowmeter body and seals, should be considered.
Inline target flowmeters are available up to approximately 6 inches in size.
Insertion target flowmeters are available for larger line sizes.
Applications requiring sanitary piping systems are often found in the pharmaceutical and chemical industries. Such as in the manufacture of drugs and vitamins.
Sanitary applications are especially prevalent in the food and beverages industry where cleanliness is important.
Applications for target flowmeters are found in the mining, mineral processing, pulp and paper, power, petroleum, chemical, and petrochemical industries.
Common applications include the measurement of process and cooling water flows.
As the most accurate and also the most expensive technology, Coriolis mass flow meters are the main instrument type used in scientific applications. They can measure corrosive and clean gases and liquids.
Coriolis mass flow meters are designed and produced according to the world’s latest Coriolis technology. It has a better appearance, stability, and accuracy. It can measure the mass flow of fluids flowing through the pipeline and is widely used in alternative energy, oil and gas, chemical, food, and other fields. Beverages, industrial energy, marine, metal and mining, power, pulp and paper, water and wastewater industries, etc.
Flow meters are the eyes of industrial production. Flow measurement is one of the components of measurement science and technology. It is closely related to the national economy, national defense construction, and scientific research. Doing this job well plays an important role in ensuring product quality, improving production efficiency, and promoting scientific and technological development. Especially in today’s energy crisis and the era of increasing automation of industrial production, the status and role of flow meters in the national economy have become more obvious.
Turbine flow meters are velocity flow meters, also called impeller flow meters. Can be used to measure the instantaneous flow and cumulative flow of liquids and gases.
Turbine flowmeters are widely used in flow measurement: petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas and cryogenic fluids. Turbine flowmeter signals can be divided into pulse signals or current signals (4-20mA). It is suitable for use with secondary display, PLC, DCS and other computer control systems.
Vortex shedding flow meter is also called Vortex flow meter. Vortex shedding flow meter is suitable for measuring steam flow rate as well as liquids and gases.
Vortex shedding flow meter, easy installation, low cost, analog, and 4-20mA output. Pressure & temperature compensation can improve the sensor for more accurate measurement. Vortex shedding flow meter is suitable for measuring steam and various liquids and gases. When the fluid flows through the assembly line of the vortex flowmeter, a vortex is formed. The frequency of vortex shedding is directly proportional to the fluid velocity.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Venturi flow meter is also called classical venturi, and is used to call venturi meter, standard venturi. It is used to measure the flow of single-phase stable fluid in closed pipelines.
Venturi flow meter is a flow measurement method based on the principle of differential pressure. Commonly used to measure the flow of fluids such as air, natural gas, coal gas, and water. In the standard throttling device, the upstream and downstream straight pipe sections required by it are short. The lasting pressure loss is small, the performance is stable, and the maintenance is convenient.
Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!
Less head loss than an orifice or nozzle meter, due to the streamlined design
Ideal for clear gas, liquid or steam applications
Available in many materials and end arrangements
Can be equipped with fittings to accept secondary instrumentation packages
The classic venturi tube is simple, durable and stable in performance.
Classic venturi pressure loss is small, saving the energy needed for fluid delivery.
Classic venturi tube in the range of 50 ~ 1200.
No real-flow calibration is required.
Beyond this range, you can refer to the design and manufacture.
When high precision is required, real-time calibration is possible.
The body is installed in long size, and it is not convenient for transportation and installation for large-diameter instruments.
What is a venturi flow meter?
Venturi flowmeter, also known as venturi tube flow meter. It is a commonly used device for measuring the flow of pressurized pipelines.
It is a differential pressure flowmeter, and is commonly used to measure the flow of air, natural gas, gas, water, and other fluids.
It consists of a “contraction section”, a “throat” and a “diffusion section”, which are installed on the pipe where the flow rate needs to be measured.
The classic venturi tube is designed and manufactured, according to China GB/T2624-93, and is verified according to the verification procedure JJG640-94.
In the standard throttling device, it requires the shortest upstream and downstream straight pipes, the lowest pressure loss, stable performance, and convenient maintenance.
Because of its accurate calculation and low energy consumption, it has been widely used in petroleum, chemical, electric power, and metallurgy industries.
Venturi flow meter parameters:
1. Nominal diameter: 50mm≤DN≤1200mm (more than this range needs to be calibrated)
The axial section of the classic venturi is shown in the figure above.
It is composed of an inlet cylinder section A, a conical contraction section B, a cylindrical throat C, and a conical diffusion section E.
The diameter of the cylinder section A is D, the length is equal to D. The contraction section B is conical and has an angle of 21 ° ± 1 °. The throat C is a cylindrical shape of diameter d, the length of which is equal to d;
E is conical and has a diffusion angle of 7° to 15°.
The constricted section of the classic venturi is divided into three forms: a coarse cast shrinkage section, a machined shrinkage section, and a coarse welded iron plate shrinkage section.
The upper-pressure port and the throat pressure port of the classic venturi, are made into several (not less than four) separate tube wall pressure ports.
And several separate tube walls are pressure-connected by a pressure-equalizing ring.
When d≥33.3mm, the diameter of the throat pressure port is 4~10mm, the diameter of the upstream pressure port should be no more than 0.1D. When d≤33.3mm, the diameter of the throat pressure port is 0.1d~0.13d. The diameter of the upstream pressure tap is 0.1d to 0.1D.
The Venturi flow meter produces a differential pressure, to calculate the flow rate through a pipe.
The meter works by measuring the pressure of fluid before and after it passes through a narrow tube; the pressure difference indicates the volumetric rate of flow.
The basic measurement principle of the new generation, of differential pressure flow measuring instruments, is the flow measurement method based on the law of conservation of energy – the primary effort equation and the flow continuity equation.
The inner venturi consists of a circular measuring tube, and a special core placed in the measuring tube and coaxial with the measuring tube.
The outer surface of the special core has a geometric profile, similar to the inner surface of a classic venturi. And forms a different diameter annular flow gap with the inner surface of the measuring tube.
How does a Venturi meter work?
The working of venturi meter is based on the principle of Bernoulli’s equation.
Bernoulli’s Statement:
It states that in a steady, ideal flow of an incompressible fluid, the total energy at any point of the fluid is constant.
The total energy consists of pressure energy, kinetic energy, and potential energy or datum energy.
Mathematically:
Here all the energies are taken per unit weight of the fluid.
The Bernoulli’s equation for the fluid passing through the section 1 and 2 are given by
Since its development, venturi products have been successfully applied to the measurement of high-humidity natural gas, low-pressure dirty biogas, coke oven gas, gas, steam, hot water, high-temperature hot kerosene, etc., And the practical application range is rapidly expanding.
Besides, the venturi tube has a unique measurement advantage, for measuring conditions such as long straight pipe installation conditions, special high temperature, high pressure, strong corrosive and dirty media, and non-single phase flow measurement.
Of course, in the sewage and wastewater treatment industry, in addition to venturi flowmeters, electromagnetic flowmeters are also the first consideration for many users. For example, if you need to measure the flow of wastewater in a 2-inch pipe. Then you can refer to: Magnetic Flow Meters Guides.
The orifice flow meter is a flowmeter with a variable cross-sectional pressure difference.
The velocity at the vein is the largest, the pressure of the fluid is minimized, the structure is simple, but the resistance loss is large.
The Venturi flow meter is also a flowmeter with a variable cross-section pressure difference.
On the basis of the orifice flowmeter, the orifice plate is replaced by a lengthy and gradually expanding short tube, and the structure is simple, the resistance loss is small, but the cost is high.
The orifice flowmeter is similar to the venturi flowmeter, in terms of working principle. But some of the main differences are that the orifice plate can be easily replaced. Adapting to a wide range of different flow rates, while the venturi’s throat diameter is fixed.
The measured flow rate range is limited by the actual pressure difference.
Due to the vortex on the downstream side of the orifice plate, the permanent loss of the orifice flowmeter is large. And the structural shape of the venturi flowmeter can avoid the formation of vortices.
Thus, permanent losses can be greatly reduced.
Venturi flowmeters consume much less energy in measuring flow than orifice flowmeters.
But because venturi flowmeters are more time consuming and expensive than orifice flowmeters, in manufacturing and processing.
Orifice flowmeters is the least troublesome when installing the pipeline and the lowest cost.
In fluid measurement, venturi flowmeters are typically used for the measurement of gas flow at low flow rates.
The orifice flow coefficient in orifice flowmeters is significantly affected by fluid disturbances, which are generated upstream of the orifice plate.
The influence of valves, elbows and other fittings.
The value of its flow coefficient is less affected by downstream disturbances.
Typically, such flow meters should be installed at 50 and 10 pipes diameters, from the upstream and downstream disturbance components, respectively.
It is obvious that the required distance is related to the nature of the disturbance.
Therefore, when measuring with an orifice flowmeter, the orifice flowmeter must be properly installed according to the disturbance of the fluid.
Through the specific analysis and comparison of the orifice flowmeter and the venturi flowmeter, the advantages and disadvantages between them can be seen. And the user is reminded to analyze and compare more when selecting the flowmeter.
In this way, you can choose the measurement tools you need.
To meet the different measurement requirements of different field conditions, Pitot tube flow sensors are divided into standard and functional structures.
The standard type is suitable for the measurement of pure gas, steam, liquid and various chemical materials and liquids. The function is suitable for the working conditions of easy blockage, adhesion, high impurity content, and solid-liquid mixed flow such as various coal gas in the metallurgical industry. Measurement of gas, steam and various liquids.
Smart Pitoba flowmeter is easy to scale and easy to install. Just make a hole in the pipeline. Insert the Smart Pitoba into the center of the pipeline. Connect it with the pipeline by welding or flange.
The difference between Pitot tube vs venturi meter, in simple terms:
Pitto is taking advantage of the same point. The only difference between the total pressure and the static pressure is the dynamic pressure V2/2g to obtain the speed and flow.
The Venturi nozzle is used to pass through two points of variable diameter. The measured pressure difference is the dynamic pressure increase (or static pressure decrease). List the continuity equation with the product of diameter and velocity. Then find the speed and flow.
Yes, Venturi tubes can measure volume flow. To be precise, the Venturi tube measures differential pressure. The differential pressure signal is transmitted to the integrator or the monitoring system, and the compensation operation is performed. is further converted into traffic. Most customers monitor volume flow.
The Venturi effect, also known as the Venturi effect. This phenomenon is named after its discoverer, the Italian physicist Giovanni Battista Venturi.
This effect is manifested when the restricted flow passes through the narrowed flow section. The flow velocity of the fluid increases, and the flow velocity is inversely proportional to the flow section.
And according to Bernoulli’s law, the increase of flow velocity is accompanied by the decrease of fluid pressure. That is, the common Venturi phenomenon.
In layman’s terms, this effect means that a low pressure will be generated near a fluid flowing at a high speed, resulting in adsorption. Using this effect, a venturi can be made.
Venturi Flow Meter is a device for measuring the flow of a pressure pipeline, which belongs to a differential pressure flowmeter. It is generally installed on the pipeline that needs to measure the flow, and can measure the flow of air, natural gas, gas, water and other fluids. Venturi Flow Meter is widely used in many energy and power industries such as gas, electricity, cement, etc. due to its simple structure, wide range of applicable working conditions, and easy real-time monitoring.
When the fluid flows through the orifice plate of the orifice flow instrument device, the cross-sectional area decreases and the velocity increases. The corresponding pressure decreases. And the degree of reduction is proportional to the fluid velocity in the flow state.
Therefore, the flow rate can be calculated by detecting the pressure difference, and then the flow rate can be calculated.
Under normal circumstances, if we want to measure differential pressure, we can directly purchase a differential pressure transmitter.
However, in fluid pipelines. The differential pressure of the fluid cannot be measured directly. A throttle is required.
When the differential pressure flowmeter measures the fluid flow parameters, it is based on the differential pressure generated by the throttling part. When the fluid passes through the throttling part, because the pipe section becomes narrower. Therefore, the flow velocity of the fluid in the pipeline increases, and the kinetic energy of the fluid also increases. increased accordingly.
Ideally, when the fluid velocity increases, part of the static pressure will be converted into fluid kinetic energy. The static pressure value of the fluid will decrease accordingly.
At this time, a pressure difference is generated, and there is a certain functional relationship between the pressure difference and the fluid flow. Only by measuring the pressure difference, the flow value of the fluid can be determined.
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Sino-Inst, China, supplies all kinds of Flow Meters. Provide professional flow measurement solutions.
A wide variety of Annubar flow meter options are available to you, such as free samples, paid samples.
Sino-Inst is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.
The top supplying country is China (Mainland), which supply 100% of the turbine flow meter respectively. Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.
You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.
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Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
