We are using several Ammonia screw compressors SAB 89 in our plant facing with some problems in the oil system.
After around 35000 hours running, there is some oil sludge and carbonated oil in the oil separator sump and oil cooler, because of unavailable space, cleaning is too hard and sticky carbon on the wall seems difficult removing.(used oil is SHELL CLAVIUS S2-FR A 68) ,also I found out thick burnt particle around the heater element. I would like to know your recommendation about this issue.
Also there is a question about relationship between amount of differential oil pressure and the capacity of oil cooling system.
The other compressor works with conditions that shown in the attachment, I found foamy oil in the sight glass, while running compressor, it is not normal. I would be very grateful if you help me to find out the problem.