Rectification for Wrong Tapping Point for Liquid Service D/P Flow Transmitter

If the line is not filled, I doubt you will get any kind of accurate reading no matter where you tap it.

You may crack-open vent plugs on transmitter's HP & LP side and make sure all the trapped air is vented and impulse lines are completely filled with condensate, then close the plugs. This may last till your line is empty again.

Again, this will not be correct solution as at later stage trapped gas or air bubbles may be present in condensate again.

Best solution to get rid off this problem will be to SHIFT the orifice to some another elevated location and place the Transmitter below it.

Regards

The photo shows the DP element with two sensing tubes off the top, which might allow for stray air to collect. But what would prevent rotating this element so that the sensing tubes were in the below-minus-45-degree quadrant, as others have described? This would help to ensure liquid in the sensing tubes, and if not completely at the bottom would also help to avoid sediment in them.

well your photo seems insufficent to clarify

If possible can you provide direction of flow? further Is the pipeline gets elevated above the transmitter on downstream of Orifice ? what is the line pressure ? Is the condensate clean ? what is the type of Orifice plate connected ? Is it a continious condensate flow?.what is the required accuracy and criticality of this flowmeter?

45/60 degree tapping angle are required if the tappings are at different plane here I feel nothing to do with tapping angle, as they on same plane . This type of Orifice flanges have two points to take out the impulse tapping the other unused tapp may be plugged may be on down side , you take a short shutdown and fixed two isolation valves at the flange bottom taps and connect the instruments .

Usman,

If it possible move the transmitter down in the same support, but in a position below of the pipe or below the taps, then makes a new impulse lines downward to the transmitter, I mean both tubings with slope to the FT not for the pipe, the idea is get full filled the tubing with water in order to prevent the in bubbles or air.

Maybe this little modification can improve the measurement of the flow and minimize the tapping points effects.

Regards

JP