PSV Sizing Calculation Report – Multi-Scenario Calculation Package (API 520/521)

Description:

Professional PSV sizing package covering four credible overpressure scenarios — fire case, blocked outlet, thermal relief, and control valve failure — with automatic governing-case comparison and standard API 526 orifice selection. Includes the full calculation workbook (Excel, live formulas across all 4 scenarios plus a governing-case summary) and a formatted report (Word) documenting methodology, equations, and results per API 520 (sizing) and API 521 (scenario basis). Ideal for relief system engineers and process engineers needing a defensible, multi-scenario sizing basis for PSV selection.

Disclaimer:

This document is a calculation template and methodology reference based on API Standards 520, 521, and 526. It is not a substitute for a complete, project-specific relief system design performed and reviewed by a qualified process safety engineer using the full applicable scenario analysis and current code editions. Required orifice areas and valve selections generated from this template must be independently verified before use for procurement or installation. No liability is accepted for damages, injury, or losses arising from use of this document.