I would be very concerned about joint restraint if plastic pipe is
used. There cold be a significant water hammer with that type of flow
from dry system.
The EoR should be consulted, but it is always best to go into that
discussion with as much information as possible.
At 09:27 AM 7/24/2008, you wrote:
I'd be concerned about two things with CPVC-
Effects of sunlight, even under the pier you'd likely get strong reflections
off the water; and where are you getting 6" CPVC?
I have no idea if regular plumber's PVC would work; if you have a
low-pressure DPV, and you're looking at a 2.5" DPV as your activating device
(and combo exhauster, it's a pretty big orifice) then wouldn't the air never
be at high pressure and so it shouldn't be a problem to use PVC?
NFI, just a thought that would save my tax dollars versus SS316.
glc
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Thursday, July 24, 2008 8:49 AM
To: [email protected]
Subject: RE: Deperming Pier
What if you ran plastic, CPVC is approved for fire protection above grade
per NFPA 13. See 6.3 of NFPA 13, 2007.
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.ch2m.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Rick Green
Sent: Thursday, July 24, 2008 8:19 AM
To: [email protected]
Subject: Deperming Pier
I am installing a dry pipe system (no sprinklers) supplying four hose valves
on a pier.
The dry pipe valve assembly is located in a heated area. Extending out from
the dry pipe valve assembly is 6" galvanized steel pipe. The steel pipe is
routed below the pier out to the location of four hose valves.
The pier is used for Deperming ships, submarines.
Deperming is a procedure for erasing the permanent magnetism from ships and
submarines<http://en.wikipedia.org/wiki/Submarines> to
camouflage<http://en.wikipedia.org/wiki/Camouflage> them against magnetic
detection vessels and enemy marine
mines<http://en.wikipedia.org/wiki/Naval_mines>.
Anyway, there is about a 200' section of the pier that requires that all
materials be non-magnetic.
* Galvanized steel pipe that NAVY specified obviously want work.
* CPVC plastic pipe will not work because installing dry system -
correct on this right?
* Provided them pricing for stainless steel, copper, brass and now
they want pricing for Aluminum,.
So a few questions
o Ever used aluminum pipe for sprinkler installations?
o Is there some other pipe type that I am not thinking about
Help would be most appreciated.
Rick E. Green
District Manager
East Coast Fire Protection, Inc.
1113 Cavalier Boulevard
Chesapeake, Virginia 23323
757/485-7486(p), 757/295-0956(direct), 757/328-0131(cell) [EMAIL PROTECTED]
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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