Smooth-Bore Nozzle Flow (GPM)

gpm = 29.7 x tip diameter^2 x sqrt(nozzle pressure), with the companion nozzle reaction 1.57 x d^2 x NP. Standard nozzle pressure is 50 psi on a handline and 80 psi on a master stream (both editable). A discharge estimate; incident command and the pump operator govern the actual flow target.

gpm = 29.7 x bore_in^2 x sqrt(nozzle_pressure_psi); companion nozzle reaction = 1.57 x bore_in^2 x nozzle_pressure_psi.

IFSTA Pumping Apparatus Driver/Operator Handbook smooth-bore discharge form (by name); classical orifice discharge, no edition cycle.

The discharge relation is public physics; standard nozzle pressures are 50 psi handline / 80 psi master. Incident command and the pump operator govern.

Estimate. AHJ and licensed fire protection engineer govern.

Field names used by the API: bore_in, nozzle_pressure_psi, gpm, reaction_lb

• Discharge coefficient the 29.7 constant bundles the standard smooth-bore discharge coefficient and unit conversion; the tip must be a true smooth boreIFSTA
• Nozzle pressure default 50 psi handline / 80 psi master, editable to the tip in useIFSTA
• Estimate a discharge estimate; incident command governs the flow target and the pump operator sets engine pressureincident command