Solve for the pressure at the outlet of the nozzle flow meter, which is higher than that at the inlet
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A nozzle flow meter is installed in a vertical pipe to measure steam. The differential pressure transmitter reading is -5%, meaning the pressure at the nozzle outlet is higher than that at the inlet. The nozzle is not installed backwards, and the source tube is connected to the high and low pressure ports of the gauge correctly. The instrument discharge and venting are also functioning normally. I would like to ask what might be the causes, and how can it be measured properly? The flow direction is from bottom to top; the pipe diameter is 600. There is a 90-degree bend at approximately 3 meters from the outlet, and the straight section ahead is long enough, so there is no problem.
Are the heights of the condensate in the two pressure tubes the same?
It is speculated that the vertical installation of the nozzle causes condensation to accumulate at the low-pressure pressure tap, resulting in incorrect pressure readings.