Hi, I have about a 3000 sq ft shop, that has a dry sprinkler system that is about 20 years old. The way it works is it is filled with air through 4" down to 1" pipes. Several of the pipes have rusted through and some of the joints have been replaced at considerable cost. It appears to be the worst in the cold attic horizontal runs where water condenses I think.
Anyway it should hold air pressure for 6-8 hours but only goes 45 minutes before the compressor kicks on. I have hunted leaks many many times with a soapy spray bottle, but cant find them. Is there some way that I could suck in a colored air or smoke or something into the compressor and look for the colored leak? That may be stupid or illegal. Does anyone have any ideas of how to isolate those tiny leaks?
thanks,
Stevo