GB/T 23258-2020 in English
VALIDStandard practicecontrolling internal corrosion in steel pipelines and piping systems
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$194.00
《GB/T 23258-2020钢质管道内腐蚀控制规范》由TC355（全国石油天然气标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Core changes in the standard revision
| Technical module | Contents of the 2009 version | Main points for upgrading the 2020 version |
|---|---|---|
| Process control | Basic process requirements | Added sand scouring control (5.4) and prevention of sudden flow pattern changes (5.1.4) |
| Material selection | Simple material regulations | Refine the application scenarios of 6 types of corrosion-resistant alloys (Table 2-5) and supplement galvanic corrosion protection (6.1.4) |
| Chemical agents | Basic requirements for corrosion inhibitors | Add bactericide/scaling inhibitor system (Chapter 7), compatibility evaluation (7.1.3) |
Corrosion control technology system
1. Key points of process control
The standard requires that the flow rate be controlled within the range of 0.5-7m/s, and a de-sander should be configured for sand-containing pipelines (5.4.1). The dehydration process should reduce the water content to <3% (5.2.1), and the oxygen content should be lower than 0.1mg/L (5.2.2).
2. Material selection matrix
316L stainless steel is suitable for CO₂ partial pressure <0.2MPa environment, UNSN06625 alloy is used for acidic conditions with H₂S partial pressure >0.003MPa (Table 2). 25Cr duplex stainless steel is preferred for seawater systems (Table 5), and its upper limit of crevice corrosion temperature is 20℃ (Table 6).
Implementation Suggestions
- New projects should be classified according to Article 4.2 for corrosivity, and composite anti-corrosion measures must be adopted for medium/severe grades
- The corrosion inhibitor filling system must be equipped with resistance probes (9.2.4) and hanging plate monitoring (9.2.6), and data records must be kept for ≥10 years (Chapter 10)
- It is recommended to use the field signal method monitoring technology (9.2.7) for submarine pipelines, and conduct a comprehensive inspection at least once a year
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
GB/T 46424-2025 in English
Failure analysis method for oil and gas transportation pipeline girth welds
2025-10-05 -
GB/T 21447-2018 in English
Specifications for steel pipeline external corrosion control
2018-02-06 -
GB/T 24259-2023 in English
Petroleum and natural gas industries—Pipeline transportation systems
2023-09-07 -
GB/T 42033-2022 in English
Specification for oil and gas pipeline integrity assessment
2022-10-12 -
GB/T 27699-2023 in English
Technical specification for in-line inspection of steel pipeline
2023-05-23 -
GB/T 23257-2017 in English
Polyethylene coating for buried steel pipeline
2017-05-12 -
GB/T 31468-2015 in English
Petroleum and natural gas industries―Pipeline transportation systems―Recommended practice for pipeline life extension
2015-05-15
