Timothy,
Small room rule cannot exceed 225-sq.ft. per head. 16 x 16 is 256-sq.ft.
per NFPA 13, for small rooms, the heads are averaged,
“Where a small room, as defined in 3.3.22, is considered, the area of sprinkler
coverage
is calculated as the area of the room divided by the number of sprinklers in
that room.”
Also, a 4 head calc. is not correct for the 900-sq.ft. area.
For quick response area reduction, i.e. 900-sq.ft. area, from NFPA 13,
“11.2.3.2.3.2 The number of sprinklers in the design area shall never be less
than five.”
For extended coverage heads, from NFPA 13,
“11.2.3.2.2.3 For extended coverage sprinklers, the minimum design area shall
be that corresponding
to the hazard in Figure 11.2.3.1.1 or the area protected by five sprinklers,
whichever is greater.”
Jeff Hewitt, PE, SET, PM.SFPE
Corporate Engineer
[cid:[email protected]]
American Fire Protection, Inc.
5525 Eastcliff Industrial Loop | Birmingham, AL 35210
205-591-9111 ext. 1452 | 205-317-0918 (cell)
205-591-9990 (Fax)
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Licensed in AL, AR, FL, GA, IL, KY, MS, MO, NC, SC, TN, TX
Fire sprinklers save lives. Can you live without them?
From: Sprinklerforum [mailto:[email protected]] On
Behalf Of Timothy W Goins
Sent: Wednesday, July 13, 2016 2:41 PM
To: [email protected]
Subject: Re: Calculating extended coverage
Use the small room rule where the head is allowed to be 9' from one wall and
calc as if it were a 16 x 16. Less pressure and water overages. 4 head calc for
900 sqft.
"For I am not ashamed of the gospel, because it is God's power for salvation to
everyone who believes..." HCS Romans 1:16
"Therefore having overlooked the times of ignorance, God is now declaring to
men that all people everywhere should repent,..." NASB Acts 17:30
On Jul 13, 2016, at 9:50 AM, Jay Stough
<[email protected]<mailto:[email protected]>> wrote:
I have a nursing care facility that I am trying to calc. Must be 13 (2007)
light. Can not use room design or residential method per state AHJ. The
building is shaped like an upper case H with the bottom legs cut off. There
are 4 rooms on one side of the corridor and 3 rooms on the other side of the
corridor in each upper leg that use extended coverage sprinkler in each room.
Also 1 standard spray sprinkler in a closet and one standard spray sprinkler in
a bathroom in each room. Sprinklers in the corridor are standard spray also.
Since I am using extended coverage sprinklers, I need to calculate 5 minimum.
The sprinklers cover 16'3 X 14', so need to calc at the 18' X 18' rate.
22.4.6.2 allows me in "rooms like closets, washrooms and similar small
compartments requiring only one sprinkler shall be permitted to be omitted from
calculations within the area of application". Can I calculate 6 extended
coverage sprinklers, without the corridor or "small rooms or compartments" for
my 1500 sq ft? Or should I calc 5 extended coverage and the hallway sprinklers
in the 1500 sq ft?
Jay Stough
NICET IV LAYOUT
NICET III ITM
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