Feed Main & Riser Sizing Calculator

Size feed mains and risers for sprinkler systems based on system demand and pressure constraints.

Input Parameters

Results

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Riser Size
in
--
Feed Main Size
in
--
Elevation Pressure Loss
psi
--
Total Friction Loss
psi
Note: Feed mains and risers must be sized for the total system demand including hose streams. Elevation pressure is a static loss that must be added to friction losses when calculating total pressure required at the base of the riser.

Reference

Elevation Pressure = Height × 0.433 psi/ft Hazen-Williams: p = (4.52 × Q^1.85) / (C^1.85 × d^4.87) psi/ft Velocity = 0.4085 × Q / d^2 Feed main velocity limit: 15 ft/s (recommended) Riser velocity limit: 20 ft/s