Originally Posted by
Bruce Wrenn
Just remember it can take as much as 24 hours to vacuum system free of water.
It might take more time. It sounds like he has a lot of water in his system.
We have to evacuate instrumentation process lines to backfill them with know fluids of a known specific gravity. Some of these lines can be 100' in length, and are 1/2" tubing. We run the vacuum fill rig for at least 24 hours, and that's with brand new tubing, that's never seen any process fluids.
In a shop air system, it would never be that critical to clean up the tubing, but you still want to do the best you can.
"The first thing you need to know, will likely be the last thing you learn." (Unknown)