In industry, we often had to supply breathing air for operators in areas like walk in sandblasting. The first link below is the NIOSH standards for breathing air, and the following links companies that offer equipment meeting those standards.
Dave mentioned the need to purge any air that leaked into the product side, and it is a key point. If you don't, recovery takes for ever, because the non condensible gasses act as a rebound spring in the recovery tank, pushing back against the pump discharge.
PS: WolfWurx used Portland Compressor in Portland, and they were competitive and provided good customer support. In retirement I haven't purchased any heavy industrial equipment in over a decade, but typically bought Quincy compressors and ancillary equipment from Rogers Machinery in Portland due to pricing and service.
An age is called Dark not because the light fails to shine, but because people refuse to see it.
Believing is seeing and ignorance is bliss until it bites you in the ass!
Fervor is the weapon of the impotent. The harder the sell, the poorer the product.
Alas, my ignorance abounds; the more I've learned, the less I know that I know..........
Thou shalt seek and respect the opinions of operators, even unto the third helper, for theirs is a wisdom unknown to technicrats.
Wise men learn more from fools, than fools from wise men.
In my dotage I finally discovered that the secret to putting on pants both legs at a time is sitting down.
Last edited by Gray Wolf; 01-11-2019 at 03:11 PM..