GB/T 33373-2016 in English

Standard Background and Scope of Application

This standard was proposed by the China Petroleum and Chemical Industry Federation and managed by the National Anti-Corrosion Standardization Technical Committee. It was issued and implemented in 2016. As the basic terminology specification in the field of electrochemical protection, it is applicable to scenarios such as scientific research, construction, evaluation and standard compilation.

Comparison of core terminology systems

Key technology analysis

Cathode protection system

The standard clearly defines two methods: forced current protection (4.1.1) and sacrificial anode protection (4.1.2):

• Forced current system requires rectifiers, auxiliary anodes and other equipment, and is suitable for long-distance pipelines
• Sacrificial anode system relies on the self-corrosion drive of magnesium/zinc alloy anodes and is suitable for small structures

Potential control parameters

Key parameters include:

• Minimum protection potential (4.1.7): Steel is usually -0.85V (CSE) in soil
• Maximum protection potential (4.1.6): Limit to prevent coating peeling
• IR drop elimination (4.1.9): Essential technology for accurate potential measurement

Technology evolution analysis

This standard systematically integrates for the first time:

1. New detection technology (such as PCM pipeline current mapping system)
2. AC and DC interference protection methods (Chapter 6)
3. Quantitative evaluation indicators (protection rate, operation rate, etc.)

Implementation suggestions