At 10:55 AM 6/19/2007, you wrote:
Todd:
This prompts several questions:
1. Is the building sprinklered?
Yes
2. When you say hose "stations", do you mean Class II or Class I
connections?
Class I
3. Is this a high-rise? If not, are you asking about hydraulics for
purposes of doing a proof calc' from the FDC or is someone requiring an
automatic water supply?
No. The calc request came via the contractor (he may have just been
to try and save pipe size). However, it's also a rhetorical question
because I have run into several buildings where this type of
arrangement exists.
4. Does each separate riser have its own FDC?
No. Yard System
5. Who designed this multi-riser arrangement? 14 says that standpipes
are to be interconnected ...
The standpipes are a request of the local AHJ and came to me via the
contractor. I was not sure if interconnection was required to be
inside the building or could be on a yard loop. NFPA 14 only says
"interconnected". The water supply is a private pump ([EMAIL PROTECTED]) and
tank supplying the yard loop. No public water. The 100 psi at the top
will not be met, so that could create another issue, unless we do an FDC calc.
Steve Leyton
PROTECTION DESIGN & CONSULTING
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Todd
Williams - work
Sent: Tuesday, June 19, 2007 3:59 AM
To: [email protected]
Subject: standpipes not in stairs
I am working on a project where an old mill is being converted to
condos. The building is 500 feet long and there is a central corridor
with units on either side. We have been asked to install hose
stations at three locations in the main corridor, fed from a separate
standpipe from the basement. These will be no where near the
stairtowers.
Due to the location of the hose connections, there is no way that a
hose connection on level 2 could ever be used for a fire on level 3.
In the hydraulic calculations, do you still need to include 250 gpm
from each of the top two outlets on the first standpipe?
Also, each standpipe is to be fed from a different riser, so the
connection of the three would occur in the underground. Do you still
need to calculate the demand that includes all three?
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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