Reference profile
- Designation
- API 520 Part II
- Title
- Sizing, Selection, and Installation of Pressure-relieving Devices - Part II: Installation
- Issuing body
- API
- Current edition
- [verify]
- Status
- Library record: published; official standard status [verify].
- Category
- Safety & Relief Devices
Overview
Covers methods of installation for pressure-relief devices for equipment that has a maximum allowable working pressure of 15 psig or greater.
Scope & Applicability
Covers
- Inlet Pressure Drop
- Discharge Backpressure
- Reactive Forces
- Isolation Valves
Does NOT cover (exclusions)
- Exclusions are not documented in this library record. Confirm the official publication, neighbouring codes, the adopted edition, and jurisdictional boundaries before application.
Key Requirements
Lifecycle requirements
- Piping Design around PSV
- Installation Guidelines
- Support Design
Technical Details
Covers methods of installation for pressure-relief devices for equipment that has a maximum allowable working pressure of 15 psig or greater.
Components: Inlet Piping, Discharge Piping, Isolation Valves, PRV Supports.
Engineering Notes
- Critical for ensuring PRV inlet pressure drop < 3% and managing reactive forces.
Related Standards
- API 520 Part I
Companion or referenced standard; verify its exact relationship in the adopted edition.
- API 521
Companion or referenced standard; verify its exact relationship in the adopted edition.
- API 526
Companion or referenced standard; verify its exact relationship in the adopted edition.
Source, Edition & Status
- Publisher
- API
- Edition Year
- N/A
- Industries
- Petrochemical, Refinery, Chemical, Oil & Gas
- Content Status
- published
- Last Reviewed
- 2026-07-01
- Last Updated
- 2026-07-01
- Verified By
- Engineering Reviewer
- Official Link
- N/A
This paraphrased summary is a discovery aid. Do not reproduce or substitute it for the copyrighted official publication or jurisdictional requirements.