Project: Proposed Building Plan – M/s DLYFT INDIA LLP
Location: VPO Kahni, District Rohtak, Haryana
Standards: IS15105:2021

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Scope of Work

• Identified and modeled the most remote area (Mezzanine Floor) for sprinkler and hydrant demand analysis.

• Classified the sprinkler system as Ordinary Hazard – Group 1 with a design density of 0.15 gpm/ft² over 1,500 ft².

• Calculated:

  • Sprinkler discharge per head (K5.6, max. 130 ft² coverage).

  • Minimum required end-head pressure (12.12 psi).

  • Flow and friction loss in mains and branch lines using HASS software.

• Included hose stream allowance (250 gpm) and hydrant demand in the total system sizing.

• Performed hydrant demand analysis for 2 × 63 mm landing valves at ≥100 psi.

• Prepared hydraulic demand curves and system supply graphs for both sprinkler and hydrant systems.

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

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Hydraulic Demand Results

Sprinkler System

• Demand Flow: ~234 gpm

• End Sprinkler Flow: 19.5 gpm @ 12.12 psi

• Hose Stream Allowance: 250 gpm

Hydrant System

• Demand Flow: 500 gpm (2 landing valves × 250 gpm)

• Residual Pressure: >100 psi at remote outlets

Combined Maximum Demand:

• Sprinkler: 234 gpm

• Hose Stream: 250 gpm

• Hydrant: 500 gpm

• Total: 984 gpm

🚒 Fire Pump Sizing

• Main Pump: 1,000 gpm @ 124 psi (8.5 bar)

• Jockey Pump: 100 gpm @ 130 psi (9 bar) for pressure maintenance

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Compliance & Outcome

• System meets IS1501:2021 requirements for flow, pressure, and duration (≥60 minutes).

• Friction losses and velocities within acceptable limits.

• Hydraulic graphs and calculation sheets prepared for submission to AHJ.

🛠 This hydraulic design ensures reliable water delivery to sprinklers and hydrants during fire scenarios, maintaining adequate residual pressures across the system while complying with international standards.

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