grasso 912 oil pressure drop

[ah fai]

hello everybody.

whats wrong with one of the ammonia low stage grasso 912 compressor oil pressure drop slowly until trip? the rest is ok with 4 bar...

thanks..

[Grizzly]

How long since the last service?
What's the state of the oil and the oil filters?
Initial thoughts would be along those lines, or has the oil been cooked and lost it's viscosity?
If not! Then you start getting into the Worn bearings and excessive wear scenario.

You give very little to indicate what you actually are experiencing.
Grizzly

[Whitemetal man]

is there liquid flood back?
Are the sump heaters working?