💧 NFPA 20 Suction Line (Velocity <15 FPS at 150% Flow), Flat-on-Top Reducer

Fire Pump Suction Pipe & NPSHa Calculator

Size fire pump suction supply piping under NFPA 20 Section 4.14: calculate water velocity limits (<15.0 FPS at 150% pump rated flow preventing suction vortex cavitations), eccentric reducer flat-on-top installation (preventing air pockets), Net Positive Suction Head Available (NPSHa margin), and mechanical engineering profits.

1. Project & Operating Inputs

Fire Pump Rated Flow (GPM e.g. 1,250 GPM Rated Fire Pump)

Suction Pipe Length (Linear Feet e.g. 65 ft Suction Run)

Customer Bid Price for Fabricated & Tested Suction Line ($)

OS&Y Gate Valve, Eccentric Flat-on-Top Reducer, Flanged Pipe & Fitters ($)

2. Financial Breakdown & Yield

NFPA 20 SUCTION PIPE VELOCITY

Turnkey Suction Piping Profit

Mechanical Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost