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What is the influence of installing straight pipe section of orifice flowmeter on measurement

Orifice flowmeter The differential pressure flowmeter has many advantages, which can greatly increase the accuracy of pressure measurement. As far as the structure is concerned, it has the advantages of no movable parts, compact structure, good stability and strong durability.

 Orifice flowmeter

The only deficiency is that Orifice flowmeter The requirements for straight pipe section are quite strict, generally speaking, the requirements are from the first 10d to the latter 5D; when the straight pipe section does not meet the requirements, it can also be 3D after 5D. However, the straight pipe section before and after the throttling piece must be straight without visible bending. The straight pipe section used to install throttling parts should be smooth. If not, the flow coefficient should be multiplied by the roughness correction factor.


In order to ensure that the flow of fluid forms a fully developed turbulent velocity distribution 1D in front of the throttling piece, and make the distribution uniform and axisymmetric, the straight pipe section must be round, and the roundness requirements of 2D range in front of the throttling part are very strict, and there are certain roundness indexes. Although the first five and the last three can make the orifice flowmeter work, it has an impact on the accuracy. If the installation site conditions permit, we suggest that the front straight pipe section should have 15d, and the rear straight pipe section should have 10d, which can greatly reduce the impact of straight pipe section on the accuracy of orifice flowmeter measurement. When designing the process pipeline, we must Orifice flowmeter Reserve the installation location, so that the traffic data will be the most accurate.

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