There is Izod pipe. The manufacturing system, for lack of a better description, kind of semi alloys the zinc with the steel in layers.
On Tue, Feb 1, 2011 at 7:19 AM, Mark Sornsin <[email protected]> wrote: > Scott: > > I don't know if this was already addressed - but to your point about zinc > coated pipe. We specify it over schedule 40, at least in dry-pipe systems, > because it performs better than schedule 40. Yes, galvanized piping will > corrode eventually; but not nearly as fast as black pipe (in a dry system). > But maybe as importantly, the level of scale build-up will be considerably > smaller. The more scale build-up, the more opportunity for scale to dislodge > during system activation and obstruct flowing sprinklers. FM still prefers > galvanized steel to black on dry and preaction systems, though they'll accept > black steel when the system 'air' pressure is maintained with an inert gas. > THAT may be the ideal solution, if you can get the owner to spend the money > on an inert gas system. > > Mark A. Sornsin, PE| Fire Protection Engineer > Ulteig Engineers, Inc.| Fargo, ND > [email protected] > > > ------------------------------------------------------ > galvanized pipe: not accepted in Mist Systems by FM > for the very reason that one can not guarantee the plating has integrity > across the entirety of a twenty-one foot stick. > which begs the question, why are we specifying zinc plated pipe > and not home-rule, old-school Sch 40 black-steel? > > > Scot Deal > Excelsior Fire Protection > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > -- 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 They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
