Reference profile
- Designation
- API 651
- Title
- Cathodic Protection of Aboveground Petroleum Storage Tanks
- Issuing body
- API
- Current edition
- [verify]
- Status
- Library record: reviewed; official standard status [verify].
- Category
- Static Equipment
1
Overview
Guidance on cathodic protection systems for the soil-side of aboveground storage tank bottoms.
2
Scope & Applicability
Covers
- Corrosion control
- Impressed current
- Sacrificial anode
- Monitoring
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
- Tank bottom CP design
- Corrosion mitigation
4
Technical Details
Guidance on cathodic protection systems for the soil-side of aboveground storage tank bottoms.
Components: Tank bottom, Anode, Rectifier, Reference cell.
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
- Applied to control external (soil-side) corrosion of tank bottoms; often paired with a bottom lining strategy.
6
Related Standards
7
Source, Edition & Status
- Publisher
- API
- Edition Year
- N/A
- Industries
- Refinery, 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.