Differential pressure flow meter indication
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Differential pressure flow meters display certain values when there is pressure in the pipeline. The measurement ranges of the three flow meters are as follows: meter No. 1 shows 800, meter No. 2 also shows 800, and meter No. 3 shows 0. However, when fluid is flowing in the pipeline, the readings of these three meters vary very little. Why is that?
It’s not a minor resection was done on the 3rd
Upon on-site inspection, the transmitter also showed 0 Kpa.
If the differential pressure is 0, then there is no differential pressure at all; it’s normal to have no flow as well. Are these three flow meters with a ratio of one to three? Please explain in detail so that everyone can understand
A flow meter has three pairs of pressure tap pipes
Try performing a low-signal cut-off, and also open the balance valve to see if the instrument returns to 0. If not, check whether the pressure lead pipe is blocked, or recalibrate it
The differential pressure of a orifice flow meter is proportional to the square of the flow rate; at low signal levels, this can cause significant changes in the flow rate, leading to large measurement errors. For example, if the output signal of the transmitter is 0.01 mA, its square root is 0.1 mA, representing a 10-fold change. Therefore, orifice flow meters need to have mechanisms in place to filter out low-level signals. Remove the low-level signals from all three flowmeters.
Why is there a flow deviation at low pressure, but no deviation once the flow returns to normal?
There is fluid flowing inside the pipeline, but gauge #3 still shows 0 KPA, while the other gauges have readings; it seems that there is a problem with gauge #3
In a stationary state, 1.2 shows an indication, while 1.3 does not. In the presence of a medium, the readings of the three flowmeters are more or less the same
I’ve read the above replies. This should be the flow measurement on the vaporization unit. Interlock of 2oo3. For the same measurement point, if three instruments give two different results, there must be some issue. It is recommended to take it apart and have a look if conditions permit~