Hydraulic Calculations – Fire Sprinkler System

As part of a tenant improvement fire protection design for Fire Stations 209 and 210, I performed detailed hydraulic calculations for the wet-pipe sprinkler system in accordance with NFPA 13 standards.

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📌 Scope of Work:

• Identified and labeled most remote areas for each sprinkler zone.

• Calculated sprinkler discharge density and coverage area as per Light Hazard Occupancy (0.10 gpm/ft² over 1,500 ft²).

• Performed hydraulic demand calculations using HASS software.

• Determined flow and pressure at remote heads, including:

  • Sprinkler k-factor (K = 5.6)

  • Flow rate per sprinkler

  • Minimum required pressure at each head

• Calculated total system demand, including friction loss in mains and branch lines.

• Verified that available water supply meets demand curve with 10% safety margin.

• Developed a hydraulic graph showing system pressure vs. demand.

• Prepared hydraulic calculation summary sheets for each zone with node references and elevation corrections.

• Ensured compliance with minimum residual pressure and flow rates per NFPA 13.

🛠️ This calculation ensures the designed system provides adequate pressure and flow during fire scenarios without exceeding pipe friction loss limits or pressure drops.

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