Scope: Far more complex than B31.4, this code covers gathering lines, transmission lines, and distribution mains for natural gas and vapor-state fluids. It is the most cited code in pipeline safety regulations (e.g., 49 CFR 192 in the US).
Key Highlights:
Who uses it? Natural gas transmission companies (e.g., TC Energy, Kinder Morgan) and municipal gas utilities. asme pipeline standards compendium
| Old Standard | Status | Replaced By | |--------------|--------|--------------| | ASME B31.4-1959 (original) | Historic | Current B31.4 | | ASME B31.8-1968 | Historic | Current B31.8 | | ASME B31G-1991 (original) | Superseded | 2012 edition (still active) | Scope: Far more complex than B31
| If your pipeline carries… | Primary standard | |--------------------------|------------------| | Crude oil, refined products, liquid CO₂ | B31.4 | | Natural gas (transmission or distribution) | B31.8 | | Hydrogen (pure or blend) | B31.12 | | Slurry (mining, minerals) | B31.11 | | Corroded pipe assessment (any liquid/gas) | B31G | | Personnel qualification (safety tasks) | B31Q | Who uses it
Note: Always check the latest edition (e.g., B31.4 – 2022, B31.8 – 2022, B31.12 – 2023). Local regulations (e.g., PHMSA in the US, CER in Canada) may mandate specific editions.
| Standard | Title | Key Focus | |----------|-------|-----------| | ASME B31.8S | Managing System Integrity of Gas Pipelines | Safety management systems, threat identification, risk assessment, performance monitoring | | ASME PCC-2 | Repair of Pressure Equipment and Piping | Permanent & temporary repairs (sleeves, clamps, composite wraps) for pipelines | | ASME B31G | Manual for Determining Remaining Strength of Corroded Pipelines | Corrosion assessment for B31.4 / B31.8 pipelines (simplified method) |