GB/T 33791-2025Technical specification for the cathodic protection of steel well casings (English PDF)
钢质井套管阴极保护技术规范
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 2, 2025
Implementation date
July 1, 2026
Scope
GB/T 33791-2025 is the English-translated version of 钢质井套管阴极保护技术规范.
GB/T 33791-2025 is the Chinese standard "Technical specification for the cathodic protection of steel well casings".
Its scope clause reads: This document specifies the corrosion environment assessment, cathodic protection criteria, cathodic protection system design, installation, and stray electricity management for the outer surface of steel well casings.
Records of flow control, cathodic protection system operation and maintenance, and corrosion control. This document applies to the design and installation of cathodic protection systems for the outer surface of steel well casings. Its clauses include terms and definitions.
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Document preview — GB/T 33791-2025
National Standard of the People's Republic of China
- ICS
- 25.220.99
- Classification
- A 29
- Replacing
- GB/T 33791-2017
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1.Scope
- 2 Normative References
- 3.Terms and Definitions
- 4.Corrosion Environment Assessment
- 5.Cathodic Protection Criteria
- 6.Design of Cathodic Protection System
- 7.Installation of the cathodic protection system
- 8.Stray current control 6.
- 9.Operation and maintenance of the cathodic protection system
- 10 Corrosion Control Records
- Appendix A (Informative) Profile Potential Method
- Appendix B (Informative) E-LogI Test Method
1 Scope
This document specifies the corrosion environment assessment, cathodic protection criteria, cathodic protection system design, installation, and stray electricity management for the outer surface of steel well casings.
Records of flow control, cathodic protection system operation and maintenance, and corrosion control.
This document applies to the design and installation of cathodic protection systems for the outer surface of steel well casings.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 21447 Standard for External Corrosion Control of Steel Pipelines
GB/T 21448-2017 Technical Specification for Cathodic Protection of Buried Steel Pipelines
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 steel well casing
A hollow cylindrical tube made of steel that is inserted into a pre-drilled well from the ground surface.
3.2 coupling
A cylindrical body used to connect two threaded pipes and having internal threads.
3.3 Natural potential
The potential of the metallic structure in the electrolyte relative to the reference electrode before applying cathodic protection.
3.4 groundbed
One or more sacrificial anodes or forced current-assisted anode systems installed under the ground surface to provide cathodic protection.
3.5 Negative return at the confluence point
The connection point between the cathode cable and the protected structure.
Note. The protection current flows back to the power source through this point.
3.6 deep groundbed
One or more anodes are installed vertically at a depth of 15m or more below the ground surface to provide cathodic protection.
3.7
A graph showing the change in voltage drop (IR) relative to the depth of the well casing.
GB/T 37309 | GB/T 35505 | GB/T 31554 | GB/T 19824 | GB/T 11372 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 19 pages — is available in the English PDF.
Referenced standards
Editions of GB/T 33791
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 33791-2025 | Technical specification for the cathodic protection of steel well casings | current edition | Current |
| GB/T 33791-2017 | Technical specification for the cathodic protection of steel well casings | previous edition | Superseded |
This page sells the current edition, GB/T 33791-2025. Earlier editions are listed for reference only.
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Related Standards
GB/T 21447-2018 — Specifications for steel pipeline external corrosion control
GB/T 21448-2017 — Specification of cathodic protection for underground steel pipelines
GB/T 7251.4-2026 — Low-voltage switchgear and controlgear assemblies - Part 4: Particular requirements for assemblies for construction sites (ACS)
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