🛑 UL 429 / NFPA 86 (Dual Fast-Closing Safety Valves <1.0s & Normally-Open Vent)

Industrial Gas Train Safety Valve Calculator

Size double-block-and-bleed safety gas trains for industrial furnaces and process boilers under NFPA 86 & UL 429: calculate fast-closing motorized Safety Shutoff Valves (SSV closing in <1.0 second on flame failure) and normally-open atmospheric vent valve pipe diameter (1/4x header diameter preventing gas pressurization between valves), and combustion safety margins.

1. Project & Operating Inputs

Burner Gas Trains Engineered (Train Count e.g. 6 Industrial Boilers)

Burner Firing Heat Input (MBH e.g. 12,000 MBH / 12 MMBTU Firing Rate)

Customer Bid Price for Supplied & Pre-Assembled Gas Train ($ / Train)

Kromschroder / Maxon SSV Valves, Proof-of-Closure Switches, Solenoids ($)

2. Financial Breakdown & Yield

NFPA 86 DOUBLE BLOCK & BLEED

Turnkey Safety Gas Train Profit

Combustion Safety Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost