DP transmitter in KO drum filling LP line

[deraa]

we have KO drum to separate liquid from gas and it has three DP level transmitters connected to ESD system. we noticed that deviation always there between them, after checking we found the wet leg (LP) become dry then we fill it again by liquid. i think the liquid in the LP side evaporates so, what is the solution for this problem?

Thanks all,

 

[Ashereng]

Most of our KO (knock out) drums use a float techonolgy for level measurements. Also, we usually only have one going to the ESD/SIS system. The other measurement goes to the PLC/DCS.

A popular manufacturer is Magnetrol. We use these quite a bit:

http://www.magnetrol.com/us/html/products.asp?family=21

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[dcasto]

How can the wet leg be dry unless it above the liquid level or has pockets. The dry or gas side can have liquids condense, so some insulate and heat trace the dry or gas side to make sure it stays dry. OR fill the dry side with a heavy oil that will not vaporize (a sealed leg) and then do the density offset calculations to compensate. There are other questions about bubblers and vaporizers on low sides.