1 reply to this topic

[Lyne]

Hello, I'm reviewing some BOG centrifugal compressors P&ID, and it catched my attention a line of gas used as purge gas ( Hc not nitrogen) at the compressor disrcharge ? It says that it’s used for startup .... any idea about this requirement ? When purge gas is needed ? And does it apply for all centrifugal compressors ? Thank you

Edited by Lyne, Today, 12:55 PM.

[Pilesar]

You need to get rid of the oxygen in the line some way after maintenance. What is your concern with the current design? I like the idea of 'N2 first with CH4 purge to remove the N2' to avoid flammable mix at all times. At least this is a question to bring up in a HAZOP. I have had BOG compressors in LNG storage designs, but never looked closely at the purge setup.