Deluge System Sizing Calculator

Calculate deluge water spray system requirements per NFPA 15 for transformers, conveyors, and special hazards.

NFPA 15: 0.25 gpm/sq ft typical for transformers

NFPA 15 Design Densities

Application Density (gpm/sf) Duration
Transformers0.2530 min
Conveyors (coal)0.3020 min
Tank Exposure0.2560 min
Aircraft Hangar0.2010 min
Cable Trays0.3020 min

Deluge System Components

Deluge Valve

Main control valve held closed by air pressure or mechanical latch. Opens on detection signal to flood the entire system simultaneously.

Open Nozzles

Unlike sprinklers, deluge nozzles have no fusible element. All nozzles discharge immediately when the valve opens.

Detection System

Heat detectors, flame detectors, or smoke detectors activate the system. Manual pull stations provide backup activation.