FIRE FIGHTING SYSTEM DESIGN

 Firefighting system Design

This is a note to those who are willing to learn the firefighting system. It is very simple if we take care of basics. 

Main points to note:

GPM<=1250 GPM For hydrant system (500 GPM at the remotest hydrants and 250 in rest of the risers in vertical riser system: Maximum 750 GPM if horizontal hydrant system)

Gpm<=1000 GPM for sprinkler system


Pump Head:

For Hydrant: The pressure at the topmost farthest hydrant is 30 PSI i.e. 2 Bar.

For Sprinkler System: Residual Pressure is almost 20 PSI minimum. (look at the table below)



https://www.phcppros.com/articles/1903-fire-pump-sizing-and-selection






SPRINKLER HYDRANT COMBINATION
Sprinkler system GPM is not to be included as it is less compared to Hydrant. 

For Light Hazard


For Ordinary Hazard



Partial Flow system



The hydraulic designs of most deluge and water spray systems require a specific residual pressure to meet the required performance. Additionally, most fixed firewater monitors, hose reels and hydrants for high hazard chemical or petroleum process areas need at least a 700 kPa (100 psi) residual pressure to provide effective coverage. NFPA Class I, II, and III standpipes for buildings require a 455 kPa (65 psi) residual pressure with the required waterflow on the highest or most remote outlet for the system.
SPRINKLER SYSTEM DESIGN


If the system exceeds 52000 sq.. floor area, then increase the number of riser. 

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