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Home My WebLink About405.035 - NFPA 13D Hydraulic Calculations Effective Date: January 2011 Justin Beal, Fire Prevention Engineer Current Revision Date: 4/18/2023 Section 405.035 Next Revision (3) Date: 4/18/2027 Page 1 of 2 Fresno City Fire Department 400 Fire Prevention Manual SECTION 405.035 NFPA 13D HYDRAULIC CALCULATIONS PURPOSE The purpose of this policy is to clarify the Fresno Fire Department’s (FFD or Department) requirements related to preparing fire sprinkler systems designed for one- and two-family dwellings in accordance with National Fire Protection Association (NFPA) 13D – Standard for the Installation of Sprinkler Systems in One- and Two- Family Dwellings (current edition with California amendments). APPLICATION This policy applies to all one- and two-family dwellings that will be equipped with a fire sprinkler system within the Department’s service area, including contract service areas. These requirements apply to both required and voluntary fire sprinkler systems. OPERATIONAL POLICY Based upon the need for uniformity in application across the Department’s diverse service delivery area, and after careful deliberation, the Department has determined the following: 1. Due to the lower water pressures experienced by water purveyors in the Department’s service delivery area, every fire sprinkler system to be installed in a one- or two-family dwelling must be provided with hydraulic calculations in accordance with NFPA 13D. 2. The use of NFPA 13D, §10.1.2 is prohibited. Designers and contractors must use the Department’s prescriptive water supply curves for fire sprinkler design as the design basis for all fire sprinkler systems, including those designed under NFPA 13D. Designers and contractors must contact the Department to obtain this information, prior to submitting a permit application. 3. The use of any NFPA 13D section which uses a prescriptive pipe sizing method is prohibited. Effective Date: January 2011 Justin Beal, Fire Prevention Engineer Current Revision Date: 4/18/2023 Section 405.035 Next Revision (3) Date: 4/18/2027 Page 2 of 2 4. When a single sprinkler head is protecting a single room and the spacing is different from that shown on the required two head calculation, the designer must also provide a single head hydraulic calculation. OPERATIONAL GUIDELINE This section intentionally left blank. PROCESS This section intentionally left blank. INFORMATION As noted in the Fresno Municipal Code (FMC), §10-50103.4, Responsibility for Enforcement, the fire code official is responsible for the enforcement of building standards and fire protection requirements relating to one- and two-family dwellings. Additionally, per the California Fire Code (CFC) and California Residential Code (CRC), the fire code official has the authority to formulate policies they deem necessary based upon local conditions related to fire sprinkler systems in one- and two-family dwellings. DEFINITIONS This section intentionally left blank. CROSS-REFERENCES California Fire Code (CFC), Current edition California Residential Code (CRC), Current edition Fresno Municipal Code (FMC) Section 10-50103.4, Responsibility for Enforcement National Fire Protection Association (NFPA) - 13D, Standard for the Installation of Sprinkler Systems in One- and Two- Family Dwellings (current edition with California amendments)