3 replies to this topic

[K J]

Dear members

         Does vapor pocket near remote seal in will effect in transmeter reading of PT. This is CO2 gas chiller ,liquid NH3 at 1.8C and 3.6 bar pressure is used for chilling service. CO2 is in side tube and liquid NH3 on shell side. this is TEMA BKM type chiller. remote seal level transmeter is installed on liquid NH3 side. problem is that this level indication frequently becomes responceless. I am suspecting that NH3 vapor pocket accumulates on liquid side tapping of remote seal which makes it irresponsive. when both tappings are flushed it starts responce. due to heat ingrace NH3 has chance to vapourise. My question is does this type of vapor accumulation in remote seal PDT will make any change on transmeter responce

Edited by K J, 12 December 2013 - 11:28 AM.

[PingPong]

It is not clear to me where exactly you suspect that vapor pocket is located, and what you mean by flushing of tappings.

 

A (hand)sketch of the situation would be helpfull, showing all relevant vertical distances.

[K J]

suspected location of vapor pocket is shown, note that HP tapping(lower taping) is insulated while lp tapping is bare. flushing mean isolation of both tapping and than opening drain shown near suspected location for removal obstruction if any. along with hand sketch GA of exchanger is also atteched. our experience for such kind of NH3 chillers is displacer type level transmeters which are not facing this problem.

Attached Files

•  vapor pocket.bmp   2.48MB   8 downloads
•  ASGP-GPEL-PK-DS-2690 09.pdf   806.83KB   9 downloads

[PingPong]

From the drawing it is not clear where the seals are located and where the transmitter is located, and what the vertical distances are between all these elements and the nozzles on the kettle.