Flow Transmitter Problem Water Carryover in Process Line, Orifice Type, Direct

Not my specialty, so please regard the following as a guess rather than expert opinion.

For the differential signal to go "negative" would imply that the sensor is below the line level and that one of the impulse tubes is filling with a more dense material (That you believe to be water.).

Maybe have the lines connected from above mid-line of pipe, and sensor at same level.

I also believe that I saw a differential monitor that had some continuous "bleed-through" so that any contaminant would not accumulate in the sensor tubes.

good luck in your quest for an answer.

Do I understand properly that the flow stream is 2 phase, a component called KERO (is this kerosene, a hydrocarbon fuel?) and water. Is it primarily Kero, with little bit of water? Correct?

Have you captured the contents of the impulse tubing when draining so you can analyze the contents?

Is the high side impulse line content primarily water or kero ?

Is the low side impulse line content primarily water or kero ?

How different is the drained impulse line content from high side to low side in terms of density/SG?

What is the general operating flow rate? 50% max? 10% max? 90% max?

What is the elevation distance from the pipe/line to the transmitter ports? 50mm? 500mm? 2000mm?

What kind of OP taps are used? Flange union? D-D/2 taps? corner taps?

Where around the circumference of the pipe are the taps located? 1 and 11 o'clock? 3 and 9 o'clock? 5 and 7 o'clock?

Friend,

What is the process temperature?

Can you take a couple of photos with the orifice plate and transmitter? I mean a good photo where we can observed the process taps and transmitter, even the heights

What do you mean with Direct???

Regards

JP

Is it practical to close-couple the transmitter to the orifice flange? I have spent many an hour re-filling impulse lines with dense fluid to maintain a "water-free" state in petroleum flowmeter applications. Usually this was where the pipe was located high above in a rack, and the transmitter was located at ground level. The fill fluid must obviously be denser than water, and ideally immiscible with water. After I left that job, I was told the instrument crew switched from glycerine to a Krytox (a DuPont product) for this very reason.

If it is practical to mount the transmitter closer to the pipe so you don't have vertical runs of impulse tubing to capture water, it avoids a lot of problems.