Reference profile
- Designation
- API 671
- Title
- Special-Purpose Couplings for Petroleum, Chemical, and Gas Industry Services
- Issuing body
- API
- Current edition
- [verify]
- Status
- Library record: reviewed; official standard status [verify].
- Category
- Rotating Equipment
1
Overview
Requirements for special-purpose couplings (mainly flexible disc) connecting critical rotating machinery.
2
Scope & Applicability
Covers
- Coupling design
- Balancing
- Overload capability
- Spacer / hub
- Guard
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
- Coupling selection
- Train torsional analysis input
4
Technical Details
Requirements for special-purpose couplings (mainly flexible disc) connecting critical rotating machinery.
Components: Flexible element, Spacer, Hub, Guard.
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
- Flexible disc couplings accommodate misalignment and feed into the train torsional model.
6
Related Standards
7
Source, Edition & Status
- Publisher
- API
- Edition Year
- N/A
- Industries
- Refinery, Petrochemical, Oil & Gas
- Content Status
- reviewed
- 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.