APISafety & Relief Devices

API 526

Flanged Steel Pressure-relief Valves

International
Safety & Relief Devices

Reference profile

Designation
API 526
Title
Flanged Steel Pressure-relief Valves
Issuing body
API
Current edition
[verify]
Status
Library record: published; official standard status [verify].
Category
Safety & Relief Devices
1

Overview

Specifies minimum requirements for direct spring-loaded pressure-relief valves and pilot-operated pressure-relief valves as follows: orifice designation and area, valve size and pressure rating, materials, and center-to-face dimensions.

2

Scope & Applicability

Covers

  • Orifice Areas (D through T)
  • Center-to-Face Dimensions
  • Materials
  • Pressure-Temperature Limits

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.
3

Key Requirements

Lifecycle requirements

  • Specifying PRV Dimensions
  • Standardizing Valve Sizes
  • Procurement
4

Technical Details

Specifies minimum requirements for direct spring-loaded pressure-relief valves and pilot-operated pressure-relief valves as follows: orifice designation and area, valve size and pressure rating, materials, and center-to-face dimensions.

Components: Flanged Spring-Loaded PRV, Pilot-Operated PRV.

Where to find it in the codeRefer to the official table of contents and the sections cited by the project specification; section numbering can vary by edition.
5

Engineering Notes

  • Provides standardized letter orifices (D through T) and physical dimensions for interchangeability.
6

Related Standards

  • API 520

    Companion or referenced standard; verify its exact relationship in the adopted edition.

  • API 527

    Companion or referenced standard; verify its exact relationship in the adopted edition.

7

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.