🛡️ ASHRAE 15 / IIAR 2 (Dual Safety Relief Valves SRV, Atmospheric Discharge Header)

Ammonia Relief Valve & Header Calculator

Size dual safety relief valves (SRV with 3-way manifold) and atmospheric discharge vent headers for ammonia pressure vessels under ASHRAE 15 & IIAR 2 Section 15: calculate required discharge capacity (Lbs/min air equivalent = C x f x D x L based on vessel surface area), size common atmospheric vent stack pipe diameter (limiting backpressure <15% of setpoint), and PSM margins.

1. Project & Operating Inputs

Pressure Vessels Protected (Vessel Count e.g. 14 NH3 Pressure Vessels)

Atmospheric Vent Line Length (Linear Feet e.g. 180 ft to Roof Stack)

Customer Bid Price for Supplied & Flanged Dual Relief System ($)

Dual SRV 3-Way Manifolds, Schedule 40 Steel Vent Pipe, Riggers & Labor ($)

2. Financial Breakdown & Yield

ASHRAE 15 AMMONIA RELIEF VALVES

Turnkey PSM Relief Header Profit

Refrigeration Safety Engineering Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost