Cold Box's Life Time

Most likely what you have is fouling. From the cooling medium side, minerals from the cooling water, over time, are deposited on the fins/plates. This deposition inhibits heat transfer, causing a degradation of the heat exchanger's efficiency.

It may be that the heat exchanger does need to be replaced. It may be also, that the heat exchanger can be descaled. Concentrate on basic engineering principles while watching the video.

thank you very much we also think that because of shut down some oil came from compressor side and as a fouling raise this problem,but about life time i couldnt find a resource.

best regards

alireza-nazarian

tabriz petrochemical company

It's almost dead--get a new one. And please figure out whether it increases/reduces the gas temperature up to/down to +/- 126°C above/below what it would otherwise be. And if "shouting it down" (such as by yellng at it) is effective, that would be really strange.