NFPA 15 Standard for Water Spray Fixed Systems for Fire Protection
The vertical distance between nozzles shall not exceed 12 ft (3.7 m) where rundown is contemplated for vertical or inclined surfaces.
The horizontal distance between nozzles shall be such that spray patterns meet or overlap at the protected surface.
Horizontal Structural Steel.
Horizontal, stressed (primary) structural steel members shall be protected by nozzles and piping of such size and arrangement to discharge a net rate of not less than 0.10 gpm/ft 2 [4.1 (L/min)/m2] over the wetted area.
Vertical Structural Steel.
Vertical structural steel members shall be protected by nozzles and piping of such size and arrangement as to discharge a net rate of not less than 0.25 gpm/ft2 [10.2 (L/min)/m2] over the wetted area.
Minimum operating pressure of any nozzle protecting outdoor hazards shall be 20 psi (1.4 bars). Nozzles protecting interior hazards shall operate in accordance with their listing.
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