Flow Pressure Transducers are measurements of fluid pressure within a pipeline. When fluid flows through a pipe, pressure acts on the pipe wall. The medium in the pipeline can be liquid or gas.
Measure the pressure of the fluid, on the one hand, you can understand the pressure in the pipeline. On the other hand, pipeline flow can be monitored through the relationship between pipe diameter-pressure-flow.
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Extended reading: Static Pressure vs Dynamic Pressur
Measuring Flow with Pressure Sensors
Differential pressure sensors have been widely used to measure the flow of incompressible liquids. A very common method is to measure the pressure drop across the orifice in the pipe and calculate the flow.
An orifice plate is simply a plate that fits in a pipe (usually between flanges) with a hole of known size in its center. As the fluid flows through the orifice, a pressure drop develops across the orifice plate from the upstream side to the downstream side. This pressure drop is proportional to flow, and the sensor signal can be used to calculate flow in engineering units.
The upstream side of the orifice will have higher pressure and will be connected to the + port of the pressure sensor through a three-valve manifold. The downstream side of the orifice is similarly connected to the -port of the pressure sensor. The three-valve manifold is used to protect the pressure sensor from overpressure when the pressure sensor is installed into the work pipeline.
Calculations to determine flow from pressure drop are derived from fairly simple physical equations. However, there are many variables, each with its own engineering unit. These include: hole geometry, pipe size, fluid viscosity and fluid density. Given the number of terms and the conversion factors involved in each variable, the calculation can be quite involved.
Fortunately, there are many online calculators that allow you to simply enter variables in any engineering units that are convenient for you, and then calculate the flow rate for any given pressure drop across the orifice.
Learn more about Flow Rate And Pressure Formula, which may help you calculate mass or volume flow.
Extended reading: Temperature and pressure compensation of vortex steam flowmeter
Pipe diameter/velocity/flow comparison table (inlet > outlet)
| Diameter (DN) | Flow m3/h | |||||||||||||
| 0.4m/s | 0.6m/s | 0.8m/s | 1.0m/s | 1.2m/s | 1.4m/s | 1.6m/s | 1.8m/s | 2.0m/s | 2.2m/s | 2.4m/s | 2.6m/s | 2.8m/s | 3.0m/s | |
| 20 | 0.5 | 0.7 | 0.9 | 1.1 | 1.4 | 1.6 | 1.8 | 2.0 | 2.3 | 2.5 | 2.7 | 2.9 | 3.2 | 3.4 |
| 25 | 0.7 | 1.1 | 1.4 | 1.8 | 2.1 | 2.5 | 2.8 | 3.2 | 3.5 | 3.9 | 4.2 | 4.6 | 4.9 | 5.3 |
| 32 | 1.2 | 1.7 | 2.3 | 2.9 | 3.5 | 4.1 | 4.6 | 5.2 | 5.8 | 6.4 | 6.9 | 7.5 | 8.1 | 8.7 |
| 40 | 1.8 | 2.7 | 3.6 | 4.5 | 5.4 | 6.3 | 7.2 | 8.1 | 9.0 | 10.0 | 10.9 | 11.8 | 12.7 | 13.6 |
| 50 | 2.8 | 4.2 | 5.7 | 7.1 | 8.5 | 9.9 | 11.3 | 12.7 | 14.1 | 15.6 | 17.0 | 18.4 | 19.8 | 21.2 |
| 65 | 4.8 | 7.2 | 9.6 | 11.9 | 14.3 | 16.7 | 19.1 | 21.5 | 23.9 | 26.3 | 28.7 | 31.1 | 33.4 | 35.8 |
| 80 | 7.2 | 10.9 | 14.5 | 18.1 | 21.7 | 25.3 | 29.0 | 32.6 | 36.2 | 39.8 | 43.4 | 47.0 | 50.7 | 54.3 |
| 100 | 11.3 | 17.0 | 22.6 | 28.3 | 33.9 | 39.6 | 45.2 | 50.9 | 56.5 | 62.2 | 67.9 | 73.5 | 79.2 | 84.8 |
| 125 | 17.7 | 26.5 | 35.3 | 44.2 | 53.0 | 61.9 | 70.7 | 79.5 | 88.4 | 97.2 | 106.0 | 114.9 | 123.7 | 132.5 |
| 150 | 25.4 | 38.2 | 50.9 | 63.6 | 76.3 | 89.1 | 101.8 | 114.5 | 127.2 | 140.0 | 152.7 | 165.4 | 178.1 | 190.9 |
| 200 | 45.2 | 67.9 | 90.5 | 113.1 | 135.7 | 158.3 | 181.0 | 203.6 | 226.2 | 248.8 | 271.4 | 294.1 | 316.7 | 339.3 |
| 250 | 70.7 | 106.0 | 141.4 | 176.7 | 212.1 | 247.4 | 282.7 | 318.1 | 353.4 | 388.8 | 424.1 | 459.5 | 494.8 | 530.1 |
| 300 | 101.8 | 152.7 | 203.6 | 254.5 | 305.4 | 356.3 | 407.1 | 458.0 | 508.9 | 559.8 | 610.7 | 661.6 | 712.5 | 763.4 |
| 350 | 138.5 | 207.8 | 277.1 | 346.4 | 415.6 | 484.9 | 554.2 | 623.4 | 692.7 | 762.0 | 831.3 | 900.5 | 969.8 | 1039.1 |
| 400 | 181.0 | 271.4 | 361.9 | 452.4 | 542.9 | 633.3 | 723.8 | 814.3 | 904.8 | 995.3 | 1085.7 | 1176.2 | 1266.7 | 1357.2 |
| 450 | 229.0 | 343.5 | 458.0 | 572.6 | 687.1 | 801.6 | 916.1 | 1030.6 | 1145.1 | 1259.6 | 1374.1 | 1488.6 | 1603.2 | 1717.7 |
| 500 | 282.7 | 424.1 | 565.5 | 706.9 | 848.2 | 989.6 | 1131.0 | 1272.3 | 1413.7 | 1555.1 | 1696.5 | 1837.8 | 1979.2 | 2120.6 |
| 600 | 407.1 | 610.7 | 814.3 | 1017.9 | 1221.4 | 1425.0 | 1628.6 | 1832.2 | 2035.7 | 2239.3 | 2442.9 | 2646.5 | 2850.0 | 3053.6 |
Extended Reading: MEMS Pressure Sensors
| Diameter(DN) | Recommended flow rate m/s: | ||||||||||||||
| 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | |
| closed system | 0.5-0.6 | 0.6-0.7 | 0.7-0.9 | 0.8-1 | 0.9-1.2 | 1.1-1.4 | 1.2-1.6 | 1.3-1.8 | 1.5-2.0 | 1.6-2.2 | 1.8-2.5 | 1.8-2.6 | 1.9-2.9 | 1.6-2.5 | 1.8-2.6 |
| open system | 0.4-0.5 | 0.5-0.6 | 0.6-0.8 | 0.7-0.9 | 0.8-1.0 | 0.9-1.2 | 1.1-1.4 | 1.2-1.6 | 1.4-1.8 | 1.5-2.0 | 1.6-2.3 | 1.7-2.4 | 1.7-2.4 | 1.6-2.1 | 1.8-2.3 |
Extended reading: Differential pressure flow meter advantages and disadvantages
Applications of Flow Pressure Transducers
Fluid Pressure Transducers are mainly used in: construction machinery, hydraulic and pneumatic systems, petrochemicals, energy and water treatment, water conservancy and hydropower, compressors and other fields:
- Applied to hydraulic system
- Applied to safety control system
- Applied to injection mold
- Applied to monitoring mine pressure
- used in compressors, air conditioning and refrigeration equipment
Extended reading: High Pressure Flow Meters Types
How to install the pressure sensor when measuring the flow pipeline?
When detecting the gas and fluid pressure in the pipeline, the pressure guiding pipe is connected with a vertical tee before entering the pressure sensor. The sampling gas enters from the upper part of the tee. The lower part of the tee is connected to a water collecting irrigation, and the horizontal interface of the tee enters the pressure sensor .
The pressure sensor is installed horizontally. The sampling pressure pipe is connected to the upper part of the pressure sensor detection diaphragm. The lower part of the detection diaphragm has its own discharge bolt.
When there is liquid entering the pressure guiding pipe, a large part will be collected in the water collecting irrigation. A small amount of liquid entering the pressure sensor detection diaphragm can be discharged by the discharge bolt of the pressure sensor.
When measuring fluid pressure, the pressure of the main fluid is taken as the measurement object. Therefore, when the pressure sensor measures the gas pressure in the pipeline, in order to prevent the liquid in it from entering the sampling pressure pipe. The sampling point is 45° above the horizontal plane of the center of the pipeline.
When measuring the liquid pressure of the pipeline, in order to prevent the gas in it from entering the sampling pressure guiding tube, the sampling point is 45° below the horizontal plane of the center of the pipeline. Read more about: Shop 101: Key Factors In Selecting A Pipe Flow Meter
Even so, it is inevitable that different phases of fluid will enter the sampling impulse pipe. There are different requirements for the installation and configuration of the pressure sensor impulse pipe.
The water collecting tank or gas collecting tank installed on the pressure guiding pipe is equipped with an inlet valve and a discharge valve. During normal testing, the inlet valve is opened and the discharge valve is closed. When it is necessary to discharge, first close the inlet valve, and then open the discharge valve. . This discharge method will always have a bit of out-of-phase fluid remaining in the water or gas header, but it will not affect the pressure sensor detection accuracy.
Fluids include both gaseous fluids and liquid fluids. The density and pressure of gaseous fluids are lower than that of liquid fluids. So in pipeline fluids, the gaseous fluid is always above the liquid fluid. This is the basic characteristic of vapor-liquid two-phase fluid.
Extended reading: Pipe Diameter vs Pressure vs Flow
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Sino-Inst is Manufacturer of Flow Pressure Transducers for Fluid Pipelines. For High Viscosity Fluids-Chemical Coatings – Paints – Slurry – Asphalt – Crude Oil. We supply more than 20 kinds of Flow Pressure Transducers.
Flow Pressure Transducers are mainly used for highly viscous media.
It can measure even liquids such as water, seawater, oil, and slurry.
Sino-Inst’s Flow Pressure Transducers, made in China, Having good Quality, With better price. Our pressure measurement instruments are widely used in China, India, Pakistan, the US, and other countries.
The entire team at Sino-Inst’s has received excellent training, so we can ensure that every client’s needs are met. For assistance with your product requirements, whether it’s a Flow Pressure Transducer, level sensor, or other device, give us a call.
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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.