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Fire Sprinkler Case Study

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You asked the following question: “We have been hired to add two pendent fire sprinklers (per a local ordinance) on to a newly enclosed porch in a condominium building. The building is six stories tall and the apartment is on the sixth floor. The building does not have a fire sprinkler system. We want to use the domestic water but the design parameters are unknown. Q1) How do we account for domestic water usage? Q2) Does NFPA 13 give guidance on this?” In response to your question we have reviewed NFPA 13, 2010 edition that you indicated as the applicable standard. Our informal interpretation is that the AHJ has to be consulted when limited area systems are installed. Limited area sprinkler protection is allowed by NFPA 13 in Section 4.2 that states, “When partial sprinkler systems are installed, the requirements of this standard shall be used insofar as they are applicable.” The limited area systems are usually installed to lower the hourly rating of an enclosure specified by the building code. This application is odd to require sprinklers for an enclosed porch in a building that is not protected with sprinklers throughout. Since these systems are code driven, section 4.2.2 states, “The authority having jurisdiction shall…show more content…
The NFPA 13 standard does not provide any guidance for determining domestic demands included for limited area systems. The NFPA 13R standard does have domestic demand information in Section 9.5 and A.9.5. The annex has tables for determining fixture load values and total estimated domestic demand. An additional resource would be the International Plumbing Code or the applicable plumbing code for that
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