No answers for you but I would like to add some questions. How much air is leaking (noting that NFPA 25 has a air leakage test that must be passed)? Is it enough to short cycle the compressor (thus consideration for a tank mounted one)?
There are some gas and sniffer tests. Did you do one or just do a hydro (I assume thats what you mean by "flooding"). Hopefully others will comment on their testing experiences as well as your compressor question. Roland On Jul 9, 2009, at 5:20 AM, Tom Duross wrote: > Good morning Campers, > > I have a dry pipe valve to replace and the client has expressed > interest in > a low differential replacement. > The system is 25 years old and has a slow leak "somewhere" that > we've not > been able to locate, even after flooding. > The air compressor is just a riser mount and with this new valve, air > pressure will drop from 45 to +/-20, 110 PSI water. > The pressure switch on the compressor has labels stating not to > adjust it > and leave it factory set, 35-45 PSI. > I don't think I can put a regulating assembly on a riser mount, saw > one once > and it telegraphed badly between the compressor and regulator. I > could > change the pressure switch to a lower rated line switch. I could also > install a regulating assembly with switch and re-wire the compressor > to the > new switch. What would you guys suggest? > > Tom Duross > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
