The general requirements for standpipes are code-driven, such as when
and where they are required. Unless there's a city ordinance that
specifically calls out what to do in this situation, the building and
fire codes basically state that if you have a change in use or
occupancy of a building that it must be brought to current code, but
if it has been continuously used and occupied since it was originally
built, the existing systems must be maintained but not necessarily
upgraded.
What I'm saying is that if the AHJ requires an upgrade, you'll need
an automatic water supply. But if it's just a sprinkler retrofit,
you can fall back on the sections in 14 that Roland and others have
referenced. It would be a good idea in that case to do a single path
calc' from the FDC (or FDC's if you upgrade to a pair as required
under the current standard) based on the inlet flow and pressure
given to you by the fire department. It would be a good CYA to let
everyone know up front how much pressure you can actually deliver to
the roof through those old, presumably Sch. 40 risers ...
Steve Leyton
Protection Design & Consulting
The foregoing is the opinion of the writer alone, and does not
necessarily represent the intent of the NFPA 14 Technical Committee,
nor constitute a formal or informal interpretation of the standard.
-----Original Message-----
From: Roland Huggins [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 31, 2007 7:58 AM
To: [email protected]
Subject: Re: NFPA #14 and pressures & pump
You know you can NOT look at just ONE section of the standard. Since
it is a high-rise, 14:5.4.1.1 is the criteria that drives this boat.
The issue on 5.4.1.3 attempts (and badly I might add) to address
using a combined standpipe. The way it is written here IMPLIES that
you can have a combined sprinkler/standpipe with an automatic
sprinkler supply but a manual standpipe supply ONLY in a retro-fit.
It applies to new buildings too as clearly indicated in the latest
edition.
Roland
On Jan 31, 2007, at 6:43 AM, art wrote:
We have a 100 ft high rise residential bldg. with major
renovations. There
are two existing 4" standpipes. The building will be retrofitted
with a
sprinkler system per NFPA 13. From NFPA 14 2003,can 5.4.1.3 be used
to not
require a fire pump to supply the standpipe 100 psi pressure since
this
existing 80 year old bldg is being sprinklered? Is the fire pump
required to
supply 750 gpm with 500 gpm at 100psi at the most remote standpipe?
Art Tiroly
ATCO Fire Protection
Roland Huggins wrote
excellent question. I put my money on Steve's answer. The NFPA
committees that I am on (or familiar with) are aggressively moving
away from encouraging occupants to use a hose (which correlates
nicely with OSHA requirements).
Roland
On Jan 30, 2007, at 1:02 PM, Steve Leyton wrote:
I think that the sections I referenced are quite clear:
"For Class III systems installed without hose, the water supply
requirements shall be as specified for Class I systems."
That would be ALL of the water supply design criteria, including
both maximum and minimum pressures.
Steve Leyton
Protection Design & Consulting
The foregoing is the opinion of the writer alone, and does not
necessarily represent the intent of the NFPA 14 Technical
Committee, nor constitute a formal or informal interpretation of
the standard.
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
