There is EXPOSED TO THE WEATHER ie pipe with rain falling directly on
it. That isn't an issue for you since an open sided garage is no
different than a warehouse with no HVAC.
SO the question is does car exhaust pose a corrosion issue. I've
seen 3/4 inch in enclosed parking garages (traps more exhaust) that
looked aok. Near the ocean is a different story.
Roland
On Aug 23, 2007, at 3:08 PM, Dave Phelan wrote:
Greetings all,
I was inspecting an 'open' on three sides parking garage today and
came
across 8" Sch 10 black pipe being run across the ceiling; one line
for FDC
on far side of building and another which will be the city supply
line to
the main building fire pump. The city water feed will end up being
heat
traced and wrapped with insulation, which I was thinking would
suffice for
corrosion protection.
It was the 'dry' piping from the FDC across to the main building
that I was
expecting to see galvanized for corrosion and resistance to vehicle
exhaust,
humidity, and water mist (this property on directly on a main river
between
NY & NJ.) Nope, apparently the piping is shown on the plans as Sch
10 black
pipe. Soooooo .......
Can the list members with piping knowledge weigh in on whether or not
exposed piping in this enviroment should be either factory treated
or field
treted for protection from corrosion. Since I must not be looking
in the
right place is there a code section I can use on this
installation ? The
project is under the 1999 Edition of NFPA 13.
It strikes me that the exposed piping will pit and corrode on the
exterior
and maybe even the interior due to the moisture and exhaust gas
components
that it will be subjected to. How have other similar projects
gone ? and
how much of this is my runaway imagination ??
Thanks.
Dave P.
An AHJ in NJ
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