P.S.
Just looking at this job now, and asked the FM what they required is how
this started. Looking closer at the plans means 3000 Sf design area for
combustible construction too. Your right we would have to use 1500 as the
starting point for a dry design, and now 3000.
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "Joe Burtell" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, April 30, 2007 11:40 AM
Subject: RE: How Much Dry Floor Area?
Area reductions do not apply to dry systems. Second, the 4 head rule is
under 11.2.3.5 Residential Sprinklers. So unless it's a listed residential
sprinkler, I don't see how you can apply the 4 head rule to QR heads.
Joe Burtell, SET, CFPS
Burtell Fire Protection, Inc.
[EMAIL PROTECTED]
www.burtellfire.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Thom
McMahon
Sent: Monday, April 30, 2007 11:35 AM
To: [email protected]
Subject: Re: How Much Dry Floor Area?
Bill:
2007 discusses the shadow area and I think the area allowed for Res. is 6
SF, if you attended Roland's and Chris's presentation on the 2007
standards
at convention last Sept. this was in the notes.
New Question:
Residential 13 occupancy. With residential heads this is a 4 head design,
however I have had an AHJ say that even if you use QR in a Residential
occupancy that it stay's a 4 head design. I've always used room design or
area density in residential occupancy's for which we had to use QR heads
for
some reason. Have I been wrong all these years?
Example: Needed to run a dry attic location to feed QR dry Pend. in
residential occupancy. 10 foot ceilings we use 900 Sf and increase by 30%
for dry. He say's that we only needed to calc 4 heads, and uses NFPA 13,
1996 Fig. A-5.3.2.2 "Examples of design areas for dwelling units."
Shows 4 heads different configurations.
Any thoughts?
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "Brooks, Bill" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, April 30, 2007 9:30 AM
Subject: How Much Dry Floor Area?
Another obstruction question related to residential sprinklers.
Figure 8.10.7.2.1.4 (2002) shows a sprinkler obstructed by a column.
Assume
a 16' x 16' coverage area from a sidewall residential sprinkler and a 12"
x
12" column located 4' from the face of the column. I calculate a 29 sq
ft
shadow area behind the column.
Is this a correct interpretation of the Figure? If so, is it possible to
shift this shadow area to another part of the room to show equivalent
protection? Is it appropriate to have 11% obstructed area in a 16' x 16'
room?
Since I'm on the subject of obstructions, what method should be used to
cover bunk beds? Is furniture excluded? Bunk beds were last mentioned
here
in October 2002 but not with respect to the obstruction hazard.
Bill Brooks
Pittsburgh, PA
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