How to debug the orifice meter?

How to debug the orifice meter?

1. The differential pressure pipeline is blocked and the differential pressure pipeline is dredging;

2. Differential pressure gauge failure, check differential pressure gauge;

3. The indicator value of the differential pressure transmitter is obviously deviated, and the indicator value should be checked.

4. The throttle element is installed in the wrong direction, and the throttle element is reinstalled.

5. The parameters of the tested medium are not consistent with the parameters used in the design of throttling device, and according to the relevant formula, the differential pressure value should be recalculated when necessary;

6. The straight pipe length of the throttle device is not enough, and the length of the straight pipe should be adjusted;

7. The inner diameter of the straight pipe section is extremely poor, and the inner diameter of the straight pipe is measured, and the maximum flow is recalculated.

8. The throttle aperture is extremely poor, and the measured throttling aperture is measured to calculate the maximum flow rate.

9. The throttle components are deformed and replace the throttle components;

10. There are fixtures on the throttle components to clean and replace the throttle components;

11. The sharp side of the orifice should be directed toward the inlet end of the fluid and the horn side as the outlet end. If it's reversed, the display will be much smaller.

Solution: check the orifice installation direction and correct the orifice plate.

12, the entry of the orifice plate edge wear, if orifice plate use for a long time, especially in the measured medium with solid particles and other debris cases, can cause the change of the orifice geometry shape and size, if the hole bigger or open hole edge dull, measuring differential pressure will be smaller, flow rate display would be low.

Solution: rework the orifice plate.

The zero drift of the transmitter: if the use time is longer, the zero of the transmitter may drift. If it is a negative drift, the pressure difference will decrease and the flow will be reduced.

Solution: correct the zero of the transmitter.

14, insufficient length of straight pipe upstream and downstream, upstream and downstream straight pipe Duan Ruguo not long enough, gas won't get full development, can cause larger error makes the measuring result, if there are multiple elbow, within the prescribed straight pipe upstream will make the measurement result is low.

Solution: to transform the steam pipe, it is the length of upstream and downstream straight pipe to meet the requirements. A rectifier is added to the throttle device.

15. Leakage of the 3-valve group of the differential pressure transmitter. If the valve leakage in the high-pressure valve in the three-valve group will cause the measurement differential pressure to decrease, the measurement result will be low.

Solution: if three valve group in the high pressure valve leakage, the valve to tighten and replaced when necessary, if three balancing valve leakage in valve group, will be to tighten the valve, replace if necessary.