The reasons for the inaccurate measurement of the orifice flowmeter, and tips on how to deal with it!

Why is the measurement of the orifice flowmeter inaccurate? Quality itself, human operation, on-site environment, etc. are all related. For orifice flowmeters, if the installation is not standardized, it will cause problems such as inaccurate measurement, high failure rate, and increased maintenance, and may cause non-standard Plan to stop and even cause a safety accident. Then the measurement of the orifice flowmeter we are installing is not accurate, what should I do? Let's try these tricks with the Kaidi meter below. The main reasons for the inaccuracy are as follows: 1. The differential pressure pipeline is blocked, clear the differential pressure pipeline; 2. The differential pressure gauge is faulty, check the differential pressure gauge; Check the value of the ruler; 4. The installation direction of the throttling element is wrong, reinstall the throttling element; 5. The working condition parameters of the measured medium are inconsistent with the parameters used in the design of the throttling device, and should be corrected according to the relevant formula, and should be recalculated if necessary Differential pressure value; 6. The length of the straight pipe section before and after the throttling device is not enough, and the length of the straight pipe section should be adjusted; 7. The inner diameter of the straight pipe section is out of tolerance, the inner diameter of the straight pipe section is measured, and the maximum flow rate is recalculated; 8. The throttling aperture is out of tolerance, the measured throttling is Aperture, recalculate the maximum flow; 9. The throttling element is deformed, replace the throttling element; 10. There is attachment on the throttling element, clean and replace the throttling element; 11. The sharp side of the orifice plate should face the fluid flow direction as the inlet The flared side is the outlet end. If installed backwards, the display will be much smaller. Check the installation direction of the orifice plate and install the orifice plate correctly Figure 1; Figure 112. The inlet edge of the orifice plate is worn, if the orifice plate is used for a long time, especially when the measured medium is mixed with solid particles and other debris, it will cause the orifice plate If the change of the geometry and size of the opening hole causes the opening to become larger or the edge of the opening becomes blunt, the measured pressure difference will become smaller and the flow display will be lower. Therefore, the orifice plate needs to be reprocessed; 13. Transmitter zero point drift: if it is used for a long time, the zero point of the transmitter may drift. If it is a negative drift, the displayed pressure difference will decrease, and the displayed flow rate will also will decrease. Correct the zero point of the transmitter for a long time; 14. The length of the upstream and downstream straight pipe sections is not enough. If the upstream and downstream straight pipe sections are not long enough, the gas will not be fully developed, which will cause a large error in the measurement results. The presence of multiple elbows in the pipe section will result in a low metering result. To transform the steam pipeline, the length of the upstream and downstream straight pipe sections must meet the specified requirements. Add a rectifier before the throttling device; 15. The three-valve group of the differential pressure transmitter leaks air. If the high-pressure valve or the balance valve in the three-valve group leaks, the measured differential pressure value will decrease, and the measurement result will be low. If the high-pressure valve in the three-valve group leaks, tighten the valve and replace it if necessary. If the balance valve in the three-valve group leaks, tighten the valve and replace it if necessary. The above is the reason why the orifice flowmeter often fails. When the orifice flowmeter is running, the wear of the machine must be indispensable. These are the reasons for the inaccurate measurement of the orifice flowmeter, so it must be done well in the future. Preventive measures to reduce the incidence of machine-to-orifice flowmeter failure. I hope this article is helpful to you, please turn it up if it is good!

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