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Join Date: May 2006
Posts: 4,163

10-11-08, 11:02 AM   #2 (permalink)  
Your biggest problem is providing the 30 cfm. That is a lot of air. If you do not have enough flow (CFM) it will not push the water from the lines. It will be able to flow past the water and leave the water in the lines.

the pressure you are releasing is not as relevent as the pressure within the sprinkler lines. If you do not have enough flow, you could run 500 psi into the lines and still not develope any pressure in the sprinkler lines.

The developed pressure in the lines is what needs to be limited to 30 psi, not what you are releasing into the lines. If you have enough flow, then yes, you would limit your release pressure to the 30 psi but if that does not maintain 30 psi in the sprinkler lines, you are not getting the job done.