Joe,
Is the 42’ the full width of the building or ½ the building width? If the
building is 42’ wide then a row of BBs at the ridge will do the job.
Regards,
G. Tim Stone
G. Tim Stone Consulting, LLC
NICET Level III Engineering Technician
Fire Protection Sprinkler Design
and Consulting Services
117 Old Stage Rd. - Essex Jct., VT. 05452
CELL: (802) 373-0638 TEL: (802) 434-2968
[email protected] <mailto:[email protected]>
From: Sprinklerforum [mailto:[email protected]] On
Behalf Of Joseph Meyer
Sent: Tuesday, October 10, 2017 4:34 PM
To: [email protected]
Subject: Attic Design, Using BB1 & AP Sprinklers
Assisted living facility under NFPA 13 with an attic above entry level with a
42 foot wide span. We are able to use BB1 sprinklers along the attic ridge
line, but the main size becomes slightly inflated when designed this way.
Tyco's published literature regarding attic sprinklers indicate that BB1
sprinklers along the ridge, used with AP sprinklers at the eaves on a dry
system should be calculated using seven BB sprinklers plus up to two most
demanding AP sprinklers (Figure 20-B-2 from TFP610 page 20, below).
If the AP sprinklers at the eaves are on their own branch lines running
perpendicular to structure (see Figure 14A below), should these branch lines
really be sized to only accommodate two sprinklers? Figure 20-C-3 indicates
that AP sprinklers should be calculated using the most demanding 1950 sqft, but
this appears to describe hip roofs, not a traditional gable. Any insight is
appreciated, thanks in advance.
--
Joe Meyer, P.E.
Fire Protection Engineer
18207 Edison Avenue
Chesterfield, MO 63005
Office Phone: (636) 530-7770
Fax: (636) 530-7877
[email protected] <mailto:[email protected]>
Fire Alarm | Fire Suppression | Life Safety
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