Relief Sizer

Pro

Pressure-relief valve and vent-line sizing per ASHRAE 15 and IIAR 2.

Overview

Relief Sizer produces the relief-protection deliverable code reviews ask for: required discharge capacity for the fire case, an API 526 orifice selection sized with the ASME air-flow equation, and the maximum vent-line run for the selected discharge pipe size — following ASHRAE 15 and IIAR 2 methodology.

Key features

• Fire-case required capacity C = f·D·L with refrigerant-specific f factors
• Combustible-occupancy multiplier for vessels near combustible materials
• API 526 orifice selection (letters D through T) via the ASME air-flow relation
• Vent-line check from isothermal compressible flow — allowable length per pipe size
• Capacity and set pressure carry from the sizing tab to the vent-line tab automatically
• Reference tabs with the underlying factors and equations for review submittals

How to use it

1. 1

   Click Relief Sizer on the RIME ribbon (Refrigeration panel).

2. 2

   Enter the vessel dimensions, refrigerant, and relief set pressure.

3. 3

   Review the required capacity and recommended orifice letter.

4. 4

   Switch to the Vent Line tab to verify the discharge piping run.