Fire Sprinkler System Design Criteria

There are specific National Fire Protection Association (NFPA) standards that are required to be used when designing fire sprinkler system installations.


  • NFPA No. 13: Installation of Sprinkler Systems
  • NFPA No. 15: Water Spray Fixed Systems for Fire Protection
  • NFPA No. 16: Installation of Foam-Water Sprinkler and Foam-Water Spray Systems
  • NFPA No. 230: Fire Protection of Storage
  • NFPA No. 20: Installation of Stationary Fire Pumps


  • NFPA No. 13: Installation of Sprinkler Systems
  • NFPA No. 13D: Sprinkler Systems in One and Two Family Dwellings
  • NFPA No. 13R: Sprinkler Systems in Residential Occupancies up to and Including Four Stories in Height

Hydraulic Calculation Minimum Safety Factor

  • Commercial, Industrial, Multifamily = 5 PSI
  • Detached Single Family, Attached Single Family, Pre- Manufactured (i.e. Mobile Homes) Single Family = 2 PSI
  • Safety factor is added into the final calculations after all other hydraulic calculations have been completed to the point where the underground service line directly connects to the public water main system.
  • All hydraulic calculations shall be based upon on-site flow test data completed no more than 180 days prior to the design submittal.