Posted by Bob P. on October 23, 2000 at 18:42:28: via: or 157.238.208.241
In Reply to: Re: Moisture in oil, dryers, dry-eyes posted by George Goble on October 22, 2000 at 21:07:54:
George,
Thanks for the information and the tip on www.sporlan.com. I'll check it out. I'll have to admit, I love to see a green dry-eye and show it to a customer even a years after it was installed.
From reading your posts on oil (great stuff I might add), when you continue to pull a vacuum on oil, once the minimum or "blanking" pressure is reached, does the oil just vaporize or does it separate changing the oil in some way? Is it different for mineral, PAG and POE?
Do you know what is the lowest vacuum you can pull on POE oil before this happens? I read you post on PAG and mineral oil.
I noticed the statment that the plastic oil containers are permiable. Do you believe this is how the moisture is introduced into the sealed containers? Could we assume that the oil in metal cans (screw top) or the pressurized 2oz refrigerant/oil charge cans are dry? Will moisture damage the oil or form any acids while still in the bottle?
I have used dry nitrogen along with vacuum and heat to remove moisture from dryers. But, these were mainly the flare type liquid line dryers that were easy to handle (for my reclaim unit). I haven't tried the dry nitrogen on an auto accumulator/reciever dryer yet. I suppose that some heat could be applied during a vacuum and the dry nitrogen pulled through from the opposite side of the system though the dryer.
I'll try the micron gauge on the oil in the charging cylinder next time and let it sit for a while to see what happens. I've generally just continued to pull a vacuum until the bubbling was minimal.
Micron vacumm gauges are a bit of a mystery. It's one area where a lot of "trust" is involved. Do you know of a way to check a micron gauge other than the calibration instructions in the lid?
Are you familiar or have you had any problems with the "Annie" micron vacuum gauge?
Thanks again for the information.
Bob