Transformer Fire Protection Deluge Calculator

Calculate transformer deluge fire protection system design per NFPA 850 including water application rate, nozzle count, and drain sizing.

Input Parameters

Results

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Total Water Demand
gpm
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Nozzles Required
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Minimum Discharge Duration
min
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Water Tank Capacity
gallons
Note: NFPA 850 requires deluge protection for oil-insulated transformers with oil volume > 500 gallons or rating > 35 MVA. FM Global DS 5-4 recommends 0.25 gpm/ft² application density. Coordinate with NFPA 15 for water spray fixed system design.

Reference

NFPA 850 / FM Global DS 5-4 Transformer Deluge: Total Flow = Surface Area * Application Rate Application Rate >= 0.25 gpm/ft² (NFPA 850 Sec 7.5) Nozzles = Total Flow / Nozzle Flow Rate Duration >= 30 min for oil-filled transformers Tank Capacity = Total Flow * Duration