🛡️ NFPA 20 Relief Valves (Pilot-Operated 3"-8" SRV, Open Waste Cone Visible Flow)

Fire Pump Pressure Relief Valve Calculator

Size main spring-loaded or pilot-operated pressure relief valves (Cla-Val / Singer) and open waste cone discharge funnels for diesel and variable speed fire pumps under NFPA 20 Section 4.19: calculate relief discharge flow (preventing overpressurizing downstream piping and sprinkler heads when churn pressure exceeds component ratings), and fire safety margins.

1. Project & Operating Inputs

Main Relief Valves Installed (Valve Count e.g. 6 Multi-Story Stations)

Relief Valve Set Pressure (PSI e.g. 175 PSI Discharge Relief)

Customer Bid Price for Supplied & Piped Main Relief Valve Skid ($ / Unit)

4"-6" Cla-Val 50B-4KG1 Pilot Relief Valve, Enclosed/Open Waste Cone, Flanges ($)

2. Financial Breakdown & Yield

NFPA 20 MAIN RELIEF VALVES

Turnkey Main Relief Valve Package Profit

Fire System Safety Engineering Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost