If that's an issue, you could use a line dryer on the air compressor. There are ways of getting around the internal moisture issue. It's just like when you're protecting a freezer and don't want any moisture in the pipe.
Otherwise, my guess is a good as yours, it would be nice sometimes if the writers of these "do's and don'ts" would give us a little bit of "why". 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 Ron Greenman Sent: Monday, May 21, 2007 5:02 PM To: [email protected] Subject: Re: Galvanized sprinkler pipe at 130F Craig, This was the first thought I had but that still leaves you with a damp and humid environment. In fact, as the compressor replaces leaking air sans moisture, the damp, humid environment should be enhanced. This explanation then accounts for freezing, but so would 40 degrees F, but not corrosion, so I don't see where 130 degrees F influences the need for galvanized or not. No science here, just random thoughts so I'm prepared for refutation On 5/21/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > 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) > -- Ron Greenman at home.... _______________________________________________ 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) _______________________________________________ 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)
