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.
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