Mass flow meter directly measures the mass flow of the medium passing through the flow meter. It can also measure the density, temperature and viscosity of the medium
Mass flow meter is a flow measuring instrument that measures the mass flow in the pipeline. The volume of a fluid is a function of fluid temperature and pressure and is a dependent variable. The quality of a fluid is a quantity that does not change with time, space temperature, and pressure.
Sino-Inst offers a variety of Mass flow meters for flow measurement. If you have any questions, please contact our sales engineers.
Mass flow meters can be divided into two categories: One is the direct type, which directly outputs the mass flow. Coriolis mass flow meters and thermal gas mass flow meters are direct mass flow meters.
The other type is indirect or deduced. By using the relationship between fluid density, temperature and pressure, the flow meter that calculates the fluid mass is an indirect mass flow meter. Such as application of ultrasonic flowmeter and density meter combination. Multiply their output to get the mass flow rate.
Direct
There are many types of direct mass flow meters, such as calorimetric, angular momentum, gyro and double impeller. This kind of instrument is suitable for measuring small flow gas, the disadvantage is that it is inert. The measured value is related to the specific heat of the gas at a constant pressure. The measuring element is in contact with the medium and is easy to be contaminated and corroded.
There are 3 main types of indirect mass flow meters: Combination of velocity flow meter and density meter. Combination of throttling (or target) flowmeter and positive displacement flowmeter. Combination of throttling (or target) flowmeter and density meter.
There is also a method that converts the measured value of a volumetric flowmeter into a volumetric flow rate in a standard state according to the working pressure and temperature of the fluid. However, when the type or composition of the medium changes, it cannot give an accurate mass flow. Strictly speaking, it is not a mass flow meter. Output density, specific gravity, volume flow, mass flow, mass energy flow, etc. It has multiple functions such as indication, analog output, printing, over-limit alarm, and instrument failure alarm.
Thermal
The basic principle of thermal mass flowmeter is to use an external heat source to heat the measured fluid in the pipeline. Heat energy flows with the fluid. The mass flow rate of the fluid is reflected by measuring the change in heat (temperature) caused by the fluid flow.
Differential pressure
The differential pressure mass flowmeter is a flowmeter based on the Magnus effect. In practical applications, the mass flow measurement is realized by the combination of orifice plate and quantitative pump. There are two common structures: double-hole plate and four-hole plate combined with quantitative pump.
Coriolis
Coriolis mass flowmeter (Coriolis flowmeter for short) is an instrument that directly measures mass flow by using the principle that fluid flows in a vibrating tube to produce Coriolis force proportional to mass flow.
The structure of Coriolis flowmeter has many forms, generally composed of vibrating tube and converter. The vibrating tube (measurement pipe) is a sensitive device. There are several shapes such as U shape, Ω shape, ring shape, straight tube shape and spiral shape. There are also methods such as double pipes, but the basic principle is the same.
First, mass flow meters are slightly more expensive than ordinary volumetric flow meters. As a manufacturer of mass flow meters. Sino-Inst hopes to provide more users with high-quality products at the best price. The price of mass flow meters is mainly affected by the following aspects:
The price of mass flow meter is based on
Caliber specification requirements,
Electrode material is selected for the corrosive medium,
The selected lining material,
The body material is sprayed with stainless steel or carbon steel,
Different specifications and material choices have different prices.
In terms of installation method, flange integrated installation or split installation, plug-in installation or clamping installation, etc., the price is different depending on the form.
Sino-Inst offer over 50Mass Flow Meters with Best Price.
A wide variety of Mass Flow Meters options are available to you, such as free samples, paid samples.
Sino-Inst is Mass Flow Meters suppliers, located in China. Mass Flow Meters products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of Magnetic Flow Meters respectively.
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.
B-F flare gas ultrasonic flowmeter adopts all-metal ultrasonic transducer. It is suitable for measurement in a variety of harsh environments. The turndown ratio is large. It can measure hydrocarbon gas, exhaust gas and other gas containing impurities and humidity.
Sino-Inst offers a variety of Ultrasonic gas flow meters for flow measurement. If you have any questions, please contact our sales engineers.
Large turndown ratio and wide flow velocity measurement range;
Suitable for multi-component metering. The gas flow meter is not affected by changes in composition.
Suitable for gas flow measurement with rapid changes in composition.
Measuring velocity and volume flow;
It can measure pulsating flow and can measure in both directions;
Measuring hydrocarbon gas;
Suitable for gas containing impurities, damp and dirty, corrosion resistance.
No routine maintenance is required.
It can be installed and maintained online.
Wide range ratio, wide applicable flow range. Can detect small leaks.
The gas flow rate in the flare system is complex and changeable, and the gas composition is often a mixture of multiple different gas sources. The measured fluid has the characteristics of complex and changeable composition, obvious pressure and temperature fluctuation, and wide flow range. Using B-F to measure this type of fluid is excellent.
The B-F flowmeter has no moving parts. The probe is made of all metal material. Can withstand the corrosive environment of flare gas. Stable and durable. Low maintenance.
B-F Ultrasonic Gas Flow Meter Technical specifications
0-1.6MPa (Higher pressure is optional. The default gauge pressure sensor, if you need an absolute pressure sensor, you need to customize)
Measuring direction
One-way measurement (two-way need to be customized)
Measuring medium
Hydrocarbon, natural gas, coal gas and other media containing water and impurities
Measurement requirements
Medium temperature
-20℃~60℃ (Limit temperature -40℃~85℃)
Ambient temperature
-25℃~ +55℃
Signal, communication and other functions
output signal
4-20mA, frequency (pulse)
Communication Interface
RS-485
Operating Voltage
24VDC
Power consumption
≤3W
data storage
18 months
Front and rear straight pipe
10D before, 5D after
Use operation
Support waveform real-time display and debugging. Set operating parameters through the instrument menu
Alarm function
When the pressure, temperature, ultrasonic signal, instrument hardware, etc. are abnormal, an alarm is generated, and the alarm information can be obtained through the upper computer software to facilitate maintenance.
Sino-Inst’s Flare Gas Ultrasonic Flow Meter offer reliable and accurate volume flow measurement in a large range of sizes and pressure rating while being fully compliant with international standards.
Sino-Inst is the risk-free choice for your gas flow measurement applications.
Sino-Inst’s Flare Gas Ultrasonic Flow Meter, 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.
B-D Ultrasonic Gas Flow Meter is a pipe section flowmeter. Use mono mode. The sound channel design of the ultrasonic transducer takes into account the requirements of various working conditions. Match the rectifier of corresponding caliber. It can be used for high-precision measurement of pipe sections smaller than DN200.
Sino-Inst offers a variety of Ultrasonic gas flow meters for flow measurement. If you have any questions, please contact our sales engineers.
No moving parts, no pressure loss, reducing use and maintenance costs;
The starting flow rate is small. Suitable for measuring low-speed flow;
Large turndown ratio, turndown ratio 1:125, measuring flow rate from 0.2-25m/s;
The metering is not affected by the composition. Suitable for measuring multi-component gases or gases with changes in composition;
The influence of dust and moisture is small. Dirty gases such as coal gas and flue gas can be measured;
Proprietary algorithm, which can adapt to the measurement occasions with rapid changes in components, rapid changes in temperature, pressure, and humidity;
Can measure pulsating flow and bidirectional flow;
Unique operating software design combines waveform debugging and parameter setting. Convenient on-site operation and maintenance;
Unique maintenance alarm can realize early warning of maintenance time. Provide product stability.
The all-metal ultrasonic transducer has strong anti-interference ability, dirt resistance and long service life.
B-D Ultrasonic Gas Flow Meter Applications
It is suitable for the measurement of alkanes such as natural gas, coal bed methane, mine gas, liquefied petroleum gas, methane, ethane, propane, butane, etc.;
It is suitable for the measurement of gas such as biogas, biological fermentation gas (water-containing impurities), and biomass fuel gas;
Suitable for the measurement of air, oxygen, nitrogen, argon, helium, nitrogen, and other non-corrosive gases;
It is suitable for the measurement of flare gas, tail gas, landfill gas, and water treatment aeration;
It is suitable for the measurement of helium, ammonia, acetylene, and other gases;
B-D Ultrasonic Gas Flow Meter Technical specifications
Technical specifications
Parameter category
Specifications
structure type
Direct type
Applicable caliber
DN50-DN200 (other calibers can be customized)
Number of channels
Mono
Flow rate range
0-25m/s
level of accuracy
1.5%, 1.0%
Resolution
0.001m/s
Flow cutoff point
Qt=0.1 Qmax
Repeatability
Class 1.0: Qt-Qmax 0.2%; Qmin-Qt0.4%
Work pressure
Class 1.5: Qt- Qmax 0.3%; Qmin-Qt 0.6%
Measuring direction
0-1.6MPa (Higher pressure is optional. The default gauge pressure sensor, if you need an absolute pressure sensor, you need to customize)
Measuring medium
Single way measurement (two-way need to be customized)
Measurement requirements
Medium temperature
-20℃~60℃ (Limit temperature -40℃~85℃）
Ambient temperature
-25℃~ +55℃
Signal, communication and other functions
output signal
4-20mA, frequency (pulse)
Communication Interface
RS-485
Operating Voltage
24VDC
Power consumption
≤3W
data storage
18 months
Front and rear straight pipe
10D before, 5D after
Use operation
Support waveform real-time display and debugging. Set operating parameters through the instrument menu
Alarm function
When the pressure, temperature, ultrasonic signal, instrument hardware, etc. are abnormal, an alarm is generated, and the alarm information can be obtained through the upper computer software to facilitate maintenance.
Explosion protection
Explosion-proof grade
Ex d mb IIC T5 Gb,
Protection level
IP65
B-D Ultrasonic Gas Flow Meter Flow Range
Nominal diameter
Turndown ratio
Q max
Q min
Metric system（mm）
British system (inch)
（m³/h）
（m³/h）
50
2”
1:80
160
2
80
3”
1:80
400
5
100
4”
1:80
640
8
150
6”
1:80
1300
18
200
8”
1:80
2200
30
Nominal diameter
Turndown ratio
Q max
Q min
Metric system（mm）
British system (inch)
（m³/h）
（m³/h）
50
2”
1:150
212
1.4
80
3”
1:125
450
3.6
100
4”
1:125
640
5.0
150
6”
1:125
1600
13
200
8”
1:100
2260
23
B-D Ultrasonic Gas Flow Meter Straight pipe requirements
a) When there is no rectifier. It is recommended that the length of the front straight pipe is greater than 10D. The length of the rear straight pipe is greater than 5D.
b) With a rectifier. It is recommended that the length of the front straight pipe section is greater than 5D. The length of the rear straight pipe section is greater than 3D.
c) When there are noise sources such as pressure regulating valves on site. A noise reduction pipe section should be installed between the flowmeter and the noise source.
Precession Vortex Gas Flowmeter, like vortex flowmeter, is a velocity flowmeter. The cost performance of the intelligent precession vortex flowmeter is higher than vortex flowmeter. The intelligent precession vortex flowmeter can only measure gas. Precession Vortex Gas Flowmeter can be made into an integrated temperature and pressure compensation. And can measure various gases. Such as compressed air, oxygen, biogas, natural gas, coal gas, etc.
Sino-Inst’s Ultrasonic Gas Flow Meter offer reliable and accurate volume flow measurement in a large range of sizes and pressure rating while being fully compliant with international standards.
Sino-Inst is the risk-free choice for your gas flow measurement applications.
Sino-Inst’s Ultrasonic Gas Flow Meter, 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 B series Ultrasonic Gas Flow Meter adopts the principle of ultrasonic time difference.
Ultrasonic Gas Flow Meter uses the superposition relationship between the propagation velocity of the ultrasonic signal in the fluid and the fluid velocity for measurement. Ultrasonic Gas Flow Meter-B series is mainly for gases with a single composition such as oxygen, nitrogen, argon, helium, etc. There are also gases such as flare gas and natural gas. The price/performance ratio is very high.
Sino-Inst offers a variety of Ultrasonic gas flow meters for flow measurement. If you have any questions, please contact our sales engineers.
D: Short connection F: Torch gas plug-in installation
Application scenarios and installation methods
2
S：Single Channel
Number of channels
3
DN50 DN80 DN100 DN150…..DN5000
caliber
4
A: Helium, nitrogen, neon, argon, air and other non-corrosive gases; B: Coalbed methane, natural gas, oil and gas, ethanol boil-off gas, methane, ethane, propane, other alkanes and olefin gases. C: Gases such as flue gas, flare gas, exhaust gas, tail gas, exhaust gas, etc. D: Blast furnace gas, converter gas, coke oven gas, carbon monoxide, mine gas and other gases. E: Biogas, fermentation gas, biomass gas, landfill gas and other gases.
Application field
Example: B-FS600C represents B flare gas flow meter. Measuring pipe section DN600. Measuring C gas.
According to the application scenario. B series gas ultrasonic flow meters are divided into B-D type and B-F type.
The Z series rectifier can effectively improve the upstream and downstream measurement conditions of the gas ultrasonic flowmeter. Improve the accuracy of the measurement structure. The Z series rectifier adopts a tube segment honeycomb rectifier. It is connected with the flow meter and the pipe section through a flange. The rectifier plate is made of stainless steel. The meter head is made of stainless steel or cast steel.
Sino-Inst’s Ultrasonic Gas Flow Meter offer reliable and accurate volume flow measurement in a large range of sizes and pressure rating while being fully compliant with international standards.
Sino-Inst is the risk-free choice for your gas flow measurement applications.
Sino-Inst’s Ultrasonic Gas Flow Meter, 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.
