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We have a airplane hangar that is over the 2,000 sqft threshold for a residential hangar, which makes it a Group III Hangar.
I'm having a hard time determining what fire suppression system would be necessary - would it be an NFPA 13 system? It's not really clear in NFPA 409. Thanks for any help. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
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I would like to get your thoughts on the intent of NFPA 409 7.7.3.5 which states "Discharge devices for the protection of columns within the remote area of the overhead sprinkler systems shall be included in the calculations for the overhead system."
When determining the remote area, should it be assumed that the column protection sprinklers are activated? In the specific case that I am referring to, if column sprinklers are not activated, the remote area of the overhead system does not fall around the columns being protected. If the column sprinklers are activated, the remote area of the overhead system shifts to fall around the columns being protected. My thought is that column protection sprinklers should be assumed to be activated when determining the remote area of the overhead system since a fire condition near the column has the potential to activate the column protection sprinklers and the remote area of the overhead system. If the column protection sprinklers is not included in determination of remote area, this fire condition could cause the system demand to exceed the available supply. What are your thoughts? Thanks! Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe NFPA 13 required Extra Hazard Group I sprinkler protection for Aircraft Hangars.
What is the appropriate density/area be under CMDA design? NFPA 409 has a minimum density of 0.17 gpm/sqft (6.9 Lpm) and uses k5.6 to k8.0 quick response sprinklers, however the design area is 15,000 sqft (1,394 sqm). The hanger is only 9,680 sqft (900 sqm) and three light aircraft are to be stored in the hangar. Would 0.30 gpm/sqft (12.2mm) density and an area of 2,500 sqft (230 sqm) with quick response not be more affective than 0.17 gpm/sqft (6.8mm) density and a 9,690 sqft (900 sqm) area? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe We're working on an aircraft hanger with a foam system. I can't quite nail this down, as NFPA 409 and the UFC don't spell this out - do the hangar doors need to be open, or closed, in case of a fire or to test the foam system?
Again, don't see any guidance spelled out in either standard. Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe Could anyone enlighten me on the purpose of "draft curtains" where mentioned in NFPA 409 (Standard on Aircraft Hangars)?
In particular in the context of sprinkler protection; paragraph A.5.17.3 clearly states that the reason for limiting a draft curtain area to 7,500 sqft (697 m2) is to improve detection and sprinkler response times...." Am I right to assume that the intention is to prevent heat from a fire event from being distributed away from sprinklers above? Would I also be right to say the same thing would apply to smoke from a fire (in respect to fire detection)? Many thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe NFPA 409, 2016 Edition, Sections 6.2.10 and 7.8 discuss the addition of a 500-gpm allowance for exterior hose.
The standard does not specify a duration, only to fall back on NFPA 13 for calculation purposes. Without any firm guidance, am I looking at a duration of 90-minutes for Extra Hazard occupancy? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe |
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