Posted 9/5/2006 09:02 (#41493 - in reply to #41475) Subject: Re: Welding air tank advice.
Water will compress about 0.3% for every 1000 psi change. If you want to split hairs, steel is compressible, but no engineer would consider either compressible under normal circumstances. Now if you don't get all the air out or can't shut the pump off, you will have a mess if something fails during a hydro test.