a single air maintenance device will serve multiple systems properly isolated from each other with check valves.
----- Original Message ----- From: "Ron Greenman" <[email protected]> To: <[email protected]> Sent: Monday, March 01, 2010 10:39 PM Subject: Re: NFPA 25 Dry system leaks Thom, Try to think of the whole thing as a system. Compressor pumps into tank through a check valve and the tank itself is extended through some piping to a system (or more) made up of more of the tank in a funny shape that resembles a sprinkler system. Because you want the air in the sprinky part to be different than the air (pressurewise of course-not chemical make-up) you need a check valve to separate the two. If you have multiple sprinky parts you need air maintenance and check for each. You don't need to trap the air between the compressor check and the tank outlet from the supply pipe. On Mon, Mar 1, 2010 at 3:36 PM, Mike Cabral <[email protected]> wrote: > I'm not sure about the check valve but make sure you use a calibrated > gauge 0-50 lb or so to set them up. The set pressure needs to be on the > button. Use the same gauge to check the trip point on the pressure > switchs. > > Mike Cabral > > ---- Tom Duross <[email protected]> wrote: >> Sorry for digressing on THIS topic as well but one question(+). >> I have a tank mounted air compressor here for two new dry pipe valves, >> low >> diff replacements for 30 y.o. problematic ones. I'm planning to keep the >> tank at 90 PSI and use the valve mfgrs. air maintenance/regulating >> assemblies to reduce to 13 PSI, one for each valve. Should I install a >> check from the tank to the assemblies or just the single checks at the >> connection to each valve? Soft seats are becoming rare in these parts >> (pahts), have any of you used rubber or plastic seated checks? Also the >> old >> renewable seat shutoffs are becoming a thing of the past here too >> (everything is imported). What about a ball valve? >> Pardon my digression and naiveté`. >> Tom >> >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://fireball.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 > [email protected] > http://fireball.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) -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: SFPE, ASCET, NFPA, AFSA, NFSA AFAA, NIBS, WSAFM, WFC _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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 [email protected] http://fireball.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)
