The hydro was probably a mistake unless you dried it thoroughly. Consider a dry pipe system. 35-45 psi of air is released and replaced by up to 175 psi of water. Hydro makes perfect sense. Now think of a pilot line. X psi of air replaced by nothing, Now think about the pilot line itself. If its galvanized and you use air, and it's the typical 1/2 inch you could be pumping wet, hot air into it and then if it's in a cold local (the likely reason for a dry pneumatic pilot line rather than a hydraulic one) it condenses and sets up the perfect conditions for corrosion. Hydro that line and not dry it thoroughly and you have a pre-corrosive environment without pumping in the hot air.
On Fri, Nov 20, 2015 at 5:51 AM, Morey, Mike <[email protected]> wrote: > We are currently replacing some existing deluge systems with a dry pilot > line. We are trying to determine the correct testing methods for this > piping in accordance with NFPA 13 - 2013. > > We are trying to determine if a 200 psi hydrostatic test is required > and/or a 24 hour air test. 25.2.2 which describes the air test addresses > Dry Pipe and Double Interlock Preaction systems by title. While the pilot > line is like a dry system it isn't one by definition. At the same time > 25.2.1.1 prescribes hydrostatic testing for "all piping and attached > appurtenances subjected to system working pressure" this line should not > normally see system water and water pressure. 25.2.1.12 deals with deluge > systems, but appears to address only the discharge piping? > > We've already hydro tested the line, but the question has been brought up > about 24 hour air testing. > > > Mike Morey, CFPS, SET > Planner Scheduler/Designer > BMWC Constructors, Inc. > 1740 W. Michigan St, Indianapolis, IN 46222 > O: 317.651.0596 | C: 317.586.8111 > [email protected]< > https://owa.bmwc.com/owa/redir.aspx?C=hEc2LsZXLUqfB3v1fAsIUDtQSkfsw9AIUxDXhx81O08DpGEK3NHRaSbWuncnZEk-mLpe2vYiBJY.&URL=mailto%3amanta%40bmwc.com> > | www.bmwc.com< > https://owa.bmwc.com/owa/redir.aspx?C=hEc2LsZXLUqfB3v1fAsIUDtQSkfsw9AIUxDXhx81O08DpGEK3NHRaSbWuncnZEk-mLpe2vYiBJY.&URL=http%3a%2f%2fwww.bmwc.com%2f > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > -- 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) A problem well stated is a problem half solved. -Charles F. Kettering, inventor and engineer (1876-1958) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
