Orifice plate flow meter
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There is an orifice flow meter on the steam pipeline of the sulfur plant; the zero point and range of the gauge are both normal, and the pipeline pressure remains stable. Yet why does the reading keep fluctuating between zero and the maximum range? Even after replacing the gauge with a new one, the fluctuations remain severe
Are gas-liquid separation tanks installed on the positive and negative pressure pipes?
There is an orifice flow meter on the steam pipeline of the sulfur unit; the zero point and range of the gauge are both normal, and the pipeline pressure remains stable. Yet why does the reading keep fluctuating between zero and the maximum range? Replacing the gauge with a new one also results in significant fluctuations. It might be steam carrying water.
It is very likely that the condensate in the pressure guiding tube contains a large number of bubbles. First, turn off the gauge, drain all the condensate, refill it, or wait until the condensate fills the pressure guiding tube on its own before turning the gauge back on to check it. If that still doesn’t work, then divide it in half to determine whether the issue lies with the voltage transformer or with the signal cable leading to the DCS.
We have also encountered this issue, where the pressure conduit is not unobstructed and pressure changes do not occur in a timely manner; clearing the pressure conduit should resolve this problem.
What is the steam temperature? There might be liquid accumulation; perhaps changing the installation direction will help, or invert the instrument