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Combined Standpipe & Sprinkler Systems
NFPA 14 tells you how to install standpipes when they are required by another code or authority. NFPA 101, (2006) in section 126.96.36.199 requires Class I standpipes for high-rise buildings, which are those buildings that are 75' or more from the highest occupiable floor to the lowest place that a fire truck pulls up to for fighting a fire. NFPA 1, (2006), requires Class I standpipes in section 188.8.131.52 for new buildings...
(1)...more than 3 stories above grade.
(2)...more than 50" above grade and containing intermediate stories or balconies.
(3)....more than 1 story below grade.
(4)....more than 20' below grade.
NFPA 14, (2007), in sections 184.108.40.206.1 and 220.127.116.11.2 states that the Class I standpipes for high rise buildings must be automatic or semiautomatic, but if the building is not classified as high rise, then the Class I standpipe may be manual.
NFPA 14, (2007), in section 7.7 states that if the standpipe is a manual system and is combined with a fire sprinkler system, then calcs are not required for the standpipe. If the standpipe is an automatic or semiautomatic system, and is combined with the fire sprinkler system, then the most demanding calcs must be met for the sprinkler system or the standpipe system. In either case however, the standpipe sizing must match fire truck supply, (which would be a minimum of 65 psi from our sprinkler technical policy plus NFPA 14 flow requirements).
Don't confuse hose connections with standpipe systems. NFPA 13, (2007), section 18.104.22.168 discusses hose connections. The explanatory text for this section in the handbook is well worth reading if you get a chance.
[Last Updated 4-11-08]
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