| If your pipeline carries… | Primary standard | |--------------------------|------------------| | Crude oil, refined products, liquid CO₂ | | | 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 |

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Without a compendium approach, engineers risk missing a critical reference. A proper compendium categorizes standards by lifecycle phase:

Back at her desk she drafted comments. She suggested changing wall thickness in a stretch where soil was acidic, and adding an inspection station near a bend that floodwaters loved. The formal language she used had to translate the empathy she'd learned from the creek into numbers: allowable stress, minimum yield, inspection intervals. The engineers replied with diagrams and counterarguments; the schedule manager reminded her of delivery dates. The Code, it turned out, was less a checklist than a conversation.