More than likely they consider the temps above 130 capable of evaporating any condensation or other moisture within the piping, thus reducing the probability of corrosion and negating the need for the galvanized pipe.
Craig L. Prahl, CET Fire Protection Group Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [EMAIL PROTECTED] http://www.lg.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dee Lockwood Sent: Friday, May 18, 2007 6:16 PM To: [email protected] Subject: Galvanized sprinkler pipe at 130F Has anyone experience with accelerated corrosion of hot dipped sprinkler pipe used in a dry pipe system? My application is galvanized pipe on a dry pipe system protecting an attic that will see temperatures of 130F for a few hours a day and a month or so each year. FM Global Data Sheet 2-8N, 3-2, requires galvanized pipe in dry pipe system "except where ambient temperatures exceed 130F." Section 2-3.1 references a lumber dry kiln. Obviously the operating conditions vary greatly between an attic and a dry kiln. The chemistry in a dry kiln is probably very complex. I contacted the American Galvanizing Association. They are unaware of any accelerated corrosion at 130F and feel galvanizing is stable to 350F. Thanks Dee Lockwood P.E. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
