We have a long, narrow basement space which will be used for storage. Because of the direction of the structure, we plan to cover the long but narrow space by two branch lines with 8 sprinklers on each line. When we're trying to determine the remote area, NFPA 13 says that the minimum length along the branch line must be 1.2 x √(remote area), which for us is 2,000 sqft. This comes out to a minimum of six sprinklers. However, if we have two branch lines with six sprinklers each, we only reach 1,560 sqft.
Is there a maximum number of sprinklers that is required to be calculated along a branch line, or for narrow spaces does the design area just take a very long and narrow coverage until it reaches the required size, regardless of how it lays against the branch lines? Thanks in advance! Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
5 Comments
Glenn Berger
6/12/2020 10:12:38 am
Additional information is required to answer this question.
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James
6/12/2020 10:14:56 am
For this project it is bound by exterior walls.
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6/12/2020 11:07:27 am
1.2 x √(remote area) is the MINIMUM length. You need to extend the remote area until you're calculating the full 2000 sq.ft. area, or the entire space, whichever is larger.
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Franck
6/12/2020 01:36:16 pm
As indicated by Colin, you will have to take the 16 sprinklers (8 on the 2 branch lines) which will be the entire area if smaller than 2000 sq ft.
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Bruce Verhei
6/15/2020 03:54:44 pm
You didn’t note edition of 13 in use.
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