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Fire Department Pumper Case Study

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You asked the following question: “I have a 20 story building that has two zones for the standpipe system. If a standpipe system is designed per 7.2.2, does this mean it has two standpipe zones and if so, does the section 7.9 apply and more specifically 7.9.4.1 where it indicates that I need a high level water storage with additional pumping equipment?” In response to your question we have reviewed NFPA 14, 2007 edition that you indicated as the applicable standard. Our informal interpretation is that an auxiliary means for a water supply to the upper zone would apply when the demand exceeds the pumping capacity of the fire department pumper.

Section 7.9.4 indicates for systems with two or more zones in which potions of the second and higher zones cannot be supplied using the residual pressure required by Section 7.8 by means of fire …show more content…

A 20-story building should not be that challenging for a Class A fire department pumper. The AHJ should take the system demand and verify that against the fire department pumper. New annex wording was provided addressing this in the 2010 edition of NFPA 14 as A.7.9.3 that states, “An auxiliary means can also be in the form of pumping through the fire department connection in series with the low- or mid-zone fire pump, as approved by the AHJ.” The 2007 edition in Section 7.9.4.1 references other means acceptable to the authority having jurisdiction would allow the arrangement described in the new annex. A fire department connection would be provided for the low zone and tied into the discharge side of the fire pump. A separate fire department connection can be provided for high zone and piped to the suction of the fire pump. Multiple fire department connections for the different zones is common. Regarding water tanks, the building code such as the IBC could require a water tank in this building. Section 903.3.5.2 addresses a secondary water supply. The code indicates an

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