[R-390] Vacuum pumps

[Bob Tetrault]

Guys,

This is off-topic, and I won't joke about wanting to purge the rebuilt
ballast tube...

I salvaged a compressor out of a bent-up freezer and quickly found that it
is capable of high vacuum. But it also has/had compressor oil circulating
along with the refrigerant and here's the question: Does anyone have any
idea how/where I can get some type of oiling working with this? Right now
I'm thinking of a bubbler set-up at the input and the exhaust. The input
bubbler would promote suspension of oil vapor and the exhaust bubbler would
serve as a collector. When exhaust is full and the input is empty I would
switch 'em. The problem with this set-up is that the initial purge with it's
high air flow flow rate would have the highest oiling rate but the long term
operation towards high vacuum would be comparatively oil starved. Any ideas?

Are there oiling systems for vacuum? Where?

Sucking air in Portland, OR

Bob