Grasso

[Josip]

Ive put it back up Josip. Might be something to learn from you guys.

Hi, Seanf

learning is endless process ... so

Not sure in your case but we had one Sabroe compressor SAB 163 with noise similar to rattling and we just made an overhaul and assembled it and start.

Unfortunately I do not remeber now, but at low capacity rattling were quite low and then at some higher capacity sound became quite high and then coming close to 100% capacity rattling were less but still present. System was NH3 -10/+35.

Then we dismantle compressor again to check for damage ... found nothing ... then start to ask questions to other people ... from an old friend dealing with Stal, Howden, Sabroe and other compressors we get an info that slide valve went worn and gap between slide valve and housing close to compressor discharge port was too big ... i.e. seems that high pressure discharge gas from one side and oil pressure from another side cause that strange behaviour (vibration) of slide valve and result was rattling noise from compressor.

We made metalisation of slide valve, but result was not so good (it is not possible to make a good metalisation on moveable parts becuse there we still have a housing which is also worn and not possible to repair with metalisation because both parts must be very precise). Only cure is to replace complete part of compressor discharge housing and of course new slide valve. Quite expensive steps and client did not agree to do that but rather listen noisy compressor.

Not sure now what kind of "happyend" was with that compressor. Must say there were four SAB 163 and 3 SAB 128 but only that one was noisy.

Best regards, Josip

[seanf]

Hi, Seanf

learning is endless process ... so

Not sure in your case but we had one Sabroe compressor SAB 163 with noise similar to rattling and we just made an overhaul and assembled it and start.

Unfortunately I do not remeber now, but at low capacity rattling were quite low and then at some higher capacity sound became quite high and then coming close to 100% capacity rattling were less but still present. System was NH3 -10/+35.

Then we dismantle compressor again to check for damage ... found nothing ... then start to ask questions to other people ... from an old friend dealing with Stal, Howden, Sabroe and other compressors we get an info that slide valve went worn and gap between slide valve and housing close to compressor discharge port was too big ... i.e. seems that high pressure discharge gas from one side and oil pressure from another side cause that strange behaviour (vibration) of slide valve and result was rattling noise from compressor.

We made metalisation of slide valve, but result was not so good (it is not possible to make a good metalisation on moveable parts becuse there we still have a housing which is also worn and not possible to repair with metalisation because both parts must be very precise). Only cure is to replace complete part of compressor discharge housing and of course new slide valve. Quite expensive steps and client did not agree to do that but rather listen noisy compressor.

Not sure now what kind of "happyend" was with that compressor. Must say there were four SAB 163 and 3 SAB 128 but only that one was noisy.

Best regards, Josip

Cheers Josip