I looked at the 2016 edition to see if the language was changed, it was not. This is usually my first move. If you ever want a committee's interpretation of the standard, look at the next edition. If they encountered an interpretation error or misunderstanding, that is where they fix it. My second move is to go back to basics, put the water on the fire. In my opinion they were going for something like this.
Additional sprinklers are not required below obstructions centered between sprinklers, in accordance with Figure 8.11.5.3.4, where the obstructions are limited to a maximum width of 24" and it does not extend more than 12" past the midpoint between sprinklers. There has been a move to remove negative language from the standard. The idea is to state where additional sprinklers are required instead of where they are not required. I think the language in this case just got a little awkward. My humble opinion only. Nick Maneen, SET c 704.791.7789 From: Sprinklerforum [mailto:[email protected]] On Behalf Of James Crawford Sent: Friday, November 24, 2017 7:51 PM To: [email protected] Subject: Obstructions with CMSA Looking for some input as some of the wording does not make sense. NFPA #13 (2013 ed) CMSA Section 8.11.5.3.4 Where the bottom of the obstruction is located 24in or more below the sprinkler deflector, the following shall occur: This would seem to infer that all the items listed must be met, but for item 2b and 3b you require a sprinkler head under the obstruction, so if you put a head under the obstruction do you still need to meet Item 1 and center the obstruction between heads. This does not make sense. Opinions please as we have an AHJ that is asking for the obstruction to be relocated and for the head under it. Thank you James Crawford Phaser Fire Protection Ltd. Phone 604-888-0318 Fax 604-888-4732 Cel 604-790-0938 Email [email protected] Web www.phaserfire.ca
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