🚰 NFPA 20 Section 4.14 (NPSHa > NPSHr Margin, 2D Anti-Vortex Plate Dimensions)

Fire Pump Suction NPSH & Anti-Vortex Calculator

Size suction supply piping and suction water storage tank anti-vortex plates for stationary fire pumps under NFPA 20 Section 4.14: calculate Net Positive Suction Head available (NPSHa maintaining ≥ 5.0 ft safety margin above pump NPSHr at 150% peak flow), size square anti-vortex plate (2.0 x pipe diameter), and fire protection piping margins.

1. Project & Operating Inputs

Fire Pump Systems Engineered (System Count e.g. 6 Dedicated Systems)

Peak Suction Flow (GPM @ 150% Flow e.g. 2,250 GPM Peak Suction)

Customer Bid Price for Supplied & Piped Suction & Anti-Vortex Skid ($)

OS&Y Gate Valves, Eccentric Reducer, 3/8" Steel Anti-Vortex Plate ($)

2. Financial Breakdown & Yield

NFPA 20 SUCTION HYDRAULICS

Turnkey Fire Pump Suction Skid Profit

Fire Protection Piping Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost