Not endorsing it as the best, nor even desirable in this application (power present), but it is certainly allowed. And as for automatic it is until, as George said, the tank is empty, but a water supply from a tank is also automatic until empty.
On Thu, Oct 4, 2012 at 2:43 PM, Roland Huggins <[email protected]>wrote: > If you use nitrogen (7.6.2.7) it now kicks you over to 7.2.6.5 (Automatic > Air Maintenance). Must admit, I see no reason to use an air tank and > plenty not to (as George already said). I'd say an air cylinder would be > not different than a nitrogen cylinder when it comes to requiring an AMD. > If you do not have a low pressure alarm, the pressure gauge has to be > checked weekly instead of monthly. Now that dry pipe system have to have > an air leakage test performed every 3 years, there shouldn't be any systems > (or at least as many) needing a compressor running full time to keep it > from tripping. > > Roland > > > On Oct 4, 2012, at 12:54 PM, Cahill, Christopher wrote: > > Looking over a job where the EOR wants to use cylinders to supply the air >> for a dry system. There is plenty of power to the building so that's not >> the issue. They are showing lab air cylinders from both air (NC) and >> nitrogen (NO) into an AMD into the system. I get automatic air is not >> required. But I'm seeing NFPA 13 '12-7.2.6.5.1 limiting air supply when >> AUTOMATIC to dependable shop system or a compressor. I don't see bottles >> being allowed. Or that is to say I don't see bottles as being a dependable >> shop system. >> >> I assume some of you have done bottles for the air to a dry system? As I >> read you can have them if someone manually opens a valve and refills the >> system when needed? Of course this is even confusing. Is there something >> on a manual fill system that requires daily checking? Or are they relying >> on the low pressure alarm to note when time to refill? Actually, the low >> pressure alarm isn't even required, right, so are they waiting for a system >> trip to know when to add air? >> >> If manual is allowed isn't an AMD off a bottle a little better but not >> quite the full blown compressor? Why would they restrict the middle on the >> order of worst to best? >> >> Who wants to straighten me out 'cuz none of us here have ever seen >> bottles used on a system? >> >> Chris Cahill, PE* >> Senior Fire Protection Engineer, Aviation & Facilities Group >> Burns & McDonnell >> >> http://fireball.firesprinkler.**org/mailman/listinfo/**sprinklerforum<http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> >> > > ______________________________**_________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.**org <[email protected]> > http://fireball.firesprinkler.**org/mailman/listinfo/**sprinklerforum<http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20121004/a4fba052/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
