Quote Originally Posted by Steve Dixey
We tried all sorts, including spraying the receiver with water, but we never really solved it,...
A DN100 is a decent size, however...if the oil temps are still shutting down the screws and all of the other usual suspects have been identified (oil cooler sizing, compressor duty, etc) the probability of excess vapor not venting adequately can usually be tied to the vent line. These pipes have to be large to allow very low pressure losses for the vapor flow they can experience.

Quote Originally Posted by Steve Dixey
... and by then we'd been taken over by a bunch of "non-spending, run it till it dies", accountants.
Arrrgghh! The bane of all honest guys trying to do a good job. These are the same people who complain when something breaks down because they would not provide the money to prevent it.