The orifice plate flowmeter has the problem and the solution way:

Orifice flowmeter is a high-range differential pressure flow device which is composed of a standard orifice plate and a multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter, and pressure transmitter) to measure gas. The flow of steam, liquid, and natural gas is widely used in process control and measurement in the fields of petroleum, chemical, metallurgy, electric power, heating, and water supply.
 
The reason why the orifice flowmeter deviates from the standard is its own working principle and structural characteristics. Its own error is produced during manufacture. The installation and use errors are due to corrosion, abrasion, contamination, etc. of the fluid medium during installation or long-term use. Caused. Therefore, we must install the flow measurement system strictly in accordance with the technical requirements and eliminate installation errors.
 
The reasons caused by the orifice flowmeter itself are: sharpness of the inlet at the right angle of the orifice, the size of the diameter of the orifice is inconsistent with the calculation, the thickness of the orifice is shameful, the steps of the orifice are generated, and the eccentricity is generated; the flatness of the upstream end of the orifice, the annular chamber Dimensions produce steps, eccentricities; pressure positions; welding, welds protruding; take pressure hole processing is not standardized or blocked; throttling parts with different degrees of axial and so on. These factors may affect the repeatability of the orifice flowmeter. The repeatability is determined by the principle of the instrument itself and the quality of the manufacturing. It is an important indicator in process control applications. Accuracy, in addition to being dependent on repeatability, is also related to the magnitude calibration system. In practical applications, the excellent repeatability of the orifice flowmeter is disturbed by many factors, including fluid viscosity, density, etc., which can affect the measurement accuracy. This effect is even more pronounced if the output characteristics of the instrument are non-linear.

Extended reading: Ming Yu controlled flow meter

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