The building code I have to use, has three group F divisions for industrial
occupancies. F1 is "high hazard", F2 is "medium hazard" and F3 is "low
hazard". The building is to be used for fabricating steel pressure vessels.
No painting or sand blasting, as they have a separate building for that. I
agree with Steve. Though the building construction is steel and concrete,
and storage would be steel pressure vessels, there could be processes
involving combustible and flammable liquids. The consultants retained by the
owner seems to think the applicable occupancy is F3. It has not been
approved yet, but I think they are in for a rude shock.
If (a big IF) it is classified as group F3, the building code permits a one
storey building of non-combustible construction to be unlimited floor area
and not required to be sprinklered. The building has to be "used solely for
low fire load occupancies such as (a) power generating plants or (b) plants
for the manufacture or storage of non-combustible materials."
Can someone give me an example of the IBC requirements for "exits" for
sprinklered vs. non-sprinklered buildings?
The standpipe requirement is from the local building code, which limits the
building area unless a standpipe system or sprinkler system is provided.
Also, it is required, for the 60 foot building height. For now, they have
asked me to tell them how much water storage will be required for a
standpipe system. We are still on the 1996 edition of NFPA 14 (adoption of
the newer codes are pending and will be pretty soon, but not yet). So the
approach I thought of using was considering each hose connection as a
standpipe and calculating 250 gpm per hose connection up to a maximum of
1250 gpm for 30 minutes. This volume of water will be provided to the hose
connections through the fire department connection, by the fire department.
But would I need to make an additional allowance for fire department outside
hoses. One fire truck could be pumping into the fire department connection
while another is drawing from the same water supply for additional hose
lines?
Actually 300,000 sq.ft. is only phase 1, phase 2 is an addition of another
300,000 sq.ft. With a 60 foot building height it would be a monster.
I'm trying to get them to go with a sprinkler system. But would one be
effective with that height? Any alternative suggestions?
Tony
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Richard Malek
Sent: April 23, 2007 6:51 PM
To: [email protected]
Subject: RE: Water supply NFPA 14 Standpipe & Hose System
Tony,
I assume you have a unlimited area F-2 (non-spinklered, one story with the
required public way/yard widths), that's how you're getting the 300K sq. ft.
unsprinklered bldg (507.2 in 2006 IBC)? If that's the case, where are you
getting the "where required" standpipe requirement from the building code? I
don't see it, is that a local requirement?
Richard Malek
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of A.P.Silva
Sent: Monday, April 23, 2007 3:16 PM
To: [email protected]
Subject: RE: Water supply NFPA 14 Standpipe & Hose System
A standpipe system is required due to size, for an unsprinklered building.
It is a building code requirement. I'm trying to encourage the owner to
sprinkler it to avoid a standpipe system and a larger water storage
requirement. So I need to calculate the water storage for sprinklers and
standpipe, for comparison.
The class III is also from the building code, which requires both 2 1/2"
hose connections (due to floor area) and 1 1/2" hose stations.
Tony
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Steve Leyton
Sent: April 23, 2007 12:58 PM
To: [email protected]
Subject: RE: Water supply NFPA 14 Standpipe & Hose System
Why is there a Class III standpipe required in the first place?
Steve Leyton
PROTECTION DESIGN & CONSULTING
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of A.P.Silva
Sent: Monday, April 23, 2007 11:48 AM
To: [email protected]
Subject: Water supply NFPA 14 Standpipe & Hose System
I'm designing a class 3 standpipe system for a single storey 300,000
sq.ft.
metal fabrication plant. No city water, so needs a water storage pond.
I'm trying to figure out the required storage volume. NFPA requires 500
gpm
from the most remote standpipe and 500 gpm from each additional stand
pipe
(for floor area exceeding 80,000 sq.ft.) with total not exceeding 1250
gpm,
for a duration of 30 minutes. My opinion is that NFPA 14 mostly covers
multi-storey buildings. When it's single storey, should I take each hose
connection as a standpipe and flow 250 gpm per connection, up to maximum
1250 gpm? It is probably the safest, as it would be the most
conservative.
Has anyone come across this situation?
The other question is regarding hose allowance for fire department. (The
building code water supply requirement does not apply in my area, if the
building has either a sprinkler or standpipe system.) NFPA 14 requires a
standpipe system to be designed for the system demand and fire
department
connections. It says to consult the AHJ for water supply from fire
department pumper. Would it be system demand OR demand for fire
department
pumper (the larger value and not both simultaneously)? Or should a hose
allowance be used same as for a sprinkler system? If so, for what
duration?
Another question (while I'm at it), NFPA 14 requires lateral piping to 2
1/2" hose connections to be protected if the building is not
sprinklered. Up
to now I've never seen piping in a single storey building in fire rated
enclosures. Is it required?
Tony
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