orifice plate flowmeterHow to debug without permission?

1. Blockage of differential pressure pipeline, unclog the differential pressure pipeline;

2. Differential pressure gauge malfunction, check the differential pressure gauge;

3. The reading of the differential pressure transmitter deviates significantly, and the reading of the ruler should be checked;

4. The installation direction of the throttling element is incorrect. Reinstall the throttling element;

5. The operating parameters of the tested medium are inconsistent with the parameters used in the design of the throttling device. They should be corrected according to relevant formulas, and if necessary, the differential pressure value should be recalculated;

6. The length of the straight pipe section before and after the throttling device is insufficient, and the length of the straight pipe section should be adjusted;

7. The inner diameter of the straight pipe section exceeds the tolerance. The inner diameter of the straight pipe section was measured and the maximum flow rate was recalculated;

8. The throttle aperture exceeds the tolerance, and the measured throttle aperture is used to recalculate the maximum flow rate;

9. The throttle element is deformed, replace the throttle element;

10. There are attachments on the throttle element. Clean and replace the throttle element;

11. The sharp side of the orifice plate should face the fluid flow as the inlet end, and the trumpet shaped side as the outlet end. If installed incorrectly, the display will be much smaller.

Solution: Check the installation direction of the orifice plate and install it correctly.

12. The inlet edge of the orifice plate is worn. If the orifice plate is used for a long time, especially when the measured medium contains solid particles and other impurities, it will cause changes in the geometric shape and size of the orifice plate. If the opening becomes larger or the opening edge becomes blunt, the measured pressure difference will decrease and the flow rate display will be lower.

Solution: Reprocess the orifice plate.

13. Zero drift of transmitter: If used for a long time, the zero point of the transmitter may drift. If it is negative drift, the displayed pressure difference will decrease and the displayed flow rate will also decrease.

Solution: Correct the zero point of the transmitter.

14. The length of the upstream and downstream straight pipe sections is not sufficient. If the upstream and downstream straight pipe sections are not long enough, the gas will not be fully developed, which will cause significant errors in the measurement results. If there are multiple bends in the specified straight pipe section upstream, the measurement results will be lower.

Solution: Modify the steam pipeline to ensure that the length of the upstream and downstream straight pipe sections meets the specified requirements. Add a rectifier in front of the throttling device.

15. The three valve group of the differential pressure transmitter is leaking. If the high-pressure valve and balance valve in the three valve group are leaking, it will cause the measured differential pressure value to decrease and the measurement result will be lower.

Solution: 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.