Does it have alligators on it?
At 10:31 AM 2/1/2011, you wrote:
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
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--
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:
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