GB/T 34346-2017 in English
VALIDGuidelines for risk based safety hazard classification of oil and gas pipelines
- Issued on:2017-10-14
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 34346-2017基于风险的油气管道安全隐患分级导则》由TC262（全国锅炉压力容器标准化技术委员会）归口，TC262SC6（全国锅炉压力容器标准化技术委员会在役承压设备分会）执行，主管部门为国家标准化管理委员会。
Introduction
Interpretation of the core content of the standard
This standard establishes a three-level hidden danger classification system (major/major/general hidden dangers) and a dual assessment mechanism (first-level screening assessment + second-level quantitative assessment). The technical framework includes:
- Five types of hidden danger identification standards (occupancy/insufficient spacing/irregular crossing/geological disasters/body defects)
- Three-stage work flow (investigation→rating→disposal)
- 12 supporting detection methods (see Appendix AC)
Technical specifications for hidden danger classification
| Hazard type | Judgment standard | Typical scenario |
|---|---|---|
| Occupancy | Buildings/stockyards/deep-rooted plants within 5m of the pipeline centerline | Illegal factory building occupation and large equipment stacking |
| Insufficient spacing | Distance from densely populated areas/flammable places does not meet the standard | Schools/gas stations near pipelines |
| Body defects | Corrosion/crack depth exceeds 20% of wall thickness | Pipeline damaged by third-party construction |
Key technologies for risk assessment
Level 1 assessment (rapid screening)
The weighted scoring method is used to quickly distinguish general hidden dangers from major/significant hidden dangers through 12 indicators. The key indicators include:
- Regional level (four-level division)
- Cathode protection effectiveness (≥80% compliance)
- Nature of the occupied material (flammable/non-flammable)
Secondary assessment (quantitative analysis)
The failure probability model is used: PoF = aff×FM×FD, where:
- aff: baseline failure probability (0.41-10×10-4/km·a)
- FM: management correction factor (0.1-10)
- FD: damage correction factor (five dimensions such as corrosion/third-party damage)
Suggestions for the implementation of the standard
Key points for data collection
Three types of basic data need to be fully collected:
- Pipeline properties (material/corrosion protection/design parameters)
- Operation records (cathodic protection/internal detection data)
- Environmental information (soil corrosivity/geological disasters)
Disposal strategy
Differentiated measures are taken according to the level:
- Major hidden dangers: Immediately stop transmission + pipe replacement and transformation (disposal within 72 hours)
- Major hidden dangers: Reduced pressure operation + 6-month rectification period
- General hidden dangers: Strengthen inspection + annual re-evaluation
Technical evolution analysis
Major breakthroughs of this standard compared with the old version:
- Introducing the ALARP principle (As Low as Reasonably Practicable)
- Adding the Quantitative Risk Calculation Model (Appendix C)
- Referencing the applicable provisions for urban gas pipelines
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