Vacuum Pump

[weagle]

Just as an observation Guys!
I have been Pumping Down, Isolating, Purging and Vacuuming systems for many Years.
Many times I just use a standard Robin 5cfm Vacuum Pump.
The plastic handles go brittle and crack eventually as the ammonia fumes attack the plasticiser in the plastic of the handle.

Theoretically the copper / brass in the motor could be affected however I have yet to experience this!
Keep an older pump handy and when it does eventually fail then the loss is felt even less.
My colleague has an old small open drive vacuum pump which works a treat, don't forget you are only trying to boil off the traces once you have purged down to atmospheric.
Pete have you considered push pulling the ammonia into large pre vacuumed receivers.

Prior to purging off the residual vapours?
Grizzly

Best answer yet. Exactly what I was going to say