David Brandenburg, CGCS said: Hopefully Sunbelt has found something out by now. We have had compressors with regulation valves on them, perhaps it is set low or faulty.
Snap valves can leak a little at low pressure and that is probably why you are seeing foam there.
The size of the compressor wont keep you from building pressure, just reduce how many heads you can blow out at once. I have done 18 hole courses with a 200CFM without issue. Just planned on taking awhile.
I had a super I worked for that used maybe a 375CFM that we would actually move around the course, the pump set up was a diesel tugboat engine on a quick coupler system, so I don't think we had the option to blow it out from there. We would be blowing out, setting in the truck and get to the point where we were ready to move and a spurt of water would come out and we would wait some more. I'm guessing it was prudent with the makeup of our irrigation lines, (some of the old stuff I think had asbestos in it), but I also thought is was so he could stay late and drink beer. The good old days.
Mel