I have a situation with obstructed construction; solid 18-inch steel beams with pockets being over 320 square feet. The beams are 10-ft on center.
The area is part of a warehouse, Ordinary Hazard Group 2. Can I space my branch lines 14-ft apart if I'm protecting every pocket? Sprinklers are 5-ft (on center) from beam and 14-ft to the next branch line. Thanks in advance! Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
8 Comments
Dan Wilder
1/5/2023 06:51:17 am
You can space sprinklers or branch lines up to 15' on center (standard sprinklers) per NFPA 13-22_10.2.4.2.1(b) provided the maximum coverage area of the sprinkler does not exceed 130 sq. ft.. Area of coverage is detailed in 13-22_9.5.2.
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Anthony
1/5/2023 07:44:41 am
As Dan said you don't have obstructed construction. you have mildly annoying construction.
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Alex
1/5/2023 10:16:23 am
Another reason why I love this forum. Wouldn't have thought about that issue. Great advise
Reply
Casey Milhorn
1/5/2023 03:09:42 pm
Love it! Mildly annoying construction. They need to add that definition to NFPA 13!
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Casey Milhorn
1/5/2023 03:09:51 pm
Love it! Mildly annoying construction. They need to add that definition to NFPA 13!
Reply
Patrick Drumm
1/6/2023 02:54:09 pm
Casey, great addition regarding the dictionary. Rhode Island is working off NFPA #13 2016 Edition, so I always have "Merriam Webster's Collegiate Dictionary Eleventh Edition" handy for all definitions of terms not defined by NFPA. I have also found NFPA's "Glossary of Terms" helpful in hunting down definitions of terms.
Glenn Berger
1/5/2023 09:22:05 am
To qualify for obstructed construction, you need deep beams spaced 7-6 on center or less. The 130 sf max area of coverage per sprinkler applies.
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Jesse
1/5/2023 02:19:55 pm
Yeah I don't think you have obstructed construction. But when you consider the beam spacing and the requiring sprinkler spacing its a pain!
Reply
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