Tough call. It really depends on the situation. If it's a fairly new
wet system connected to a public water supply, I may stick with the
same as for a new system. If the mains are screwed together (usually
a sign of age), then I may go from 120 to 100 unless I can get a look
inside the pipe. Dry systems I will usually apply a penalty to as
scale can be more of a problem. One the other hand, galvanized pipe,
I'll stick with the 120.
I am working on a project in a mill that was built in 1904. The
sprinkler system takes suction from the adjacent river with a pump
assembly that belongs in a museum. (plus another pump and tank
installed 25 years ago). The 3/4" pipe was replaced and several zone
valves were cut into the 6" risers. The pipe (even the 3/4") looked
as clean as something you'd find at Home Depot. Go figure.
One issue that I haven't seen discussed much is the quality of the
older steel vs. the new stuff. That may have some impact on corrosion
resistance.
At 09:19 AM 6/18/2007, you wrote:
Todd et al,
As an additional note, what C-factor do you use for calculating the
existing pipe?
Thank You
Rahe Loftin, P.E.
Region 7 - GSA
Office - 817-978-7299
Fax - 817-978-8644
Cell - 817-371-3102
"Todd Williams -
work" To
<[EMAIL PROTECTED]> [email protected]
Sent by: cc
sprinklerforum-bo
[EMAIL PROTECTED] Subject
er.org Re: Reuse of existing sprinkler
pipe
06/18/2007 08:14
AM
Please respond to
[EMAIL PROTECTED]
resprinkler.org
As far as re-using pipe that has been taken down, In general most of
it goes to scrap, especially if a demo contractor takes it down
and/or there is evidence of corrosion or MIC. On a practical note,
not all of the pipe in my client's shops is new, so some used stuff
it out there. This especially hold true for oddball pipe and
fittings, such as 3-1/2". As far as I know, most of it is used for
things like drops or where the unusual stuff applies and not for use
on new installations. I don't necessarily police that stuff if I'm
doing shop drawings for a contractor, so I can't say for sure what
everyone does.
For pipe that is up there, it's re-used all the time. When an
addition is putting on an existing building and the plan is to
connect to the existing system, you don't remove all of the existing
and replace it as well. If you priced a job that way, you'd never get
the contract.
The contractors amongst us could speak for the pressure testing and
warrantee issues better than I.
At 08:44 AM 6/18/2007, you wrote:
>Both
>
>Rahe Loftin
>
>
>
>----- Original Message -----
>From: "Todd Williams - work" [EMAIL PROTECTED]
>Sent: 06/18/2007 08:26 AM AST
>To: [email protected]
>Subject: RE: Reuse of existing sprinkler pipe
>
>
>
>I'm getting a little confused. Are we talking about re-using pipe
>that remains in place or has been taken down and someone wants to put back
up?
>
>
>At 08:19 AM 6/18/2007, you wrote:
>>No way would I reuse 25 year old pipe or permit it to be reused on a
>>project of mine. Per 13 you can't reuse heads that have been removed
>>either.
>>
>>If you take down 25 year old pipe it should be scrapped. IMHO I would
>>not want to sign my name to that warranty. Plus, I would only warranty
>>that part of the system I touched, never the entire thing.
>>Guaranteeing someone else's work is risky.
>>
>>It would be like putting a new engine in your car and then putting the
>>old oil in it from the previous one that blew up. It might work for a
>>while but who knows. It isn't worth taking the risk. Do it right the
>>first time.
>>
>>
>>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
>>[EMAIL PROTECTED]
>>Sent: Sunday, June 17, 2007 4:14 PM
>>To: [email protected]
>>Subject: Reuse of existing sprinkler pipe
>>
>>Dear forum,
>>What is the consensus about reusing existing sprinkler piping in a 25
>>year old system. The question here is, what is the typical design for
>>providing new pipe and sprinklers in some parts of a building but using
>>the existing pipe for the rest of the system and still warranting the
>>entire system - existing and new?
>>
>>What about taking out existing 25 year old pipe and relocating it for
>>use in another area?
>>
>>Thank You
>>
>>Rahe Loftin, P.E.
>>Region 7 - GSA
>>Office - 817-978-7299
>>Fax - 817-978-8644
>>Cell - 817-371-3102
>>
>>
>>_______________________________________________
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>
>Todd G. Williams, PE
>Fire Protection Design/Consulting
>Stonington, Connecticut
>860-535-2080
>www.fpdc.com
>_______________________________________________
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
860-535-2080
www.fpdc.com
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Stonington, Connecticut
860-535-2080
www.fpdc.com
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