Contains universal definitions and requirements for materials, welding, inspection, and maintenance that apply across all sections.
Always verify the revision. ASME B3112 was first issued in 2019. A newer revision may be in development (check the ASME website for the latest edition). Do not rely on PDFs dated prior to 2019.
The latest version, , was published in December 2023 and supersedes the 2019 edition. It's important to always use the most current edition, as codes like this are frequently updated to reflect new research and industry practices. asme b 3112 pdf
The table below summarizes the key differences:
Free PDF download sites are notorious vectors for malware, ransomware, and corporate espionage tools. How to Get the Official Document A newer revision may be in development (check
A common question among piping engineers is whether they can simply use ASME B31.3 for a hydrogen project. While ASME B31.3 covers general process piping, it does not feature the specific material reduction factors required for safe hydrogen containment.
Requirements to maintain material toughness. It's important to always use the most current
Tailored for transmission lines. It addresses route selection, soil loads, pipeline crossings (roads, rivers), cathodic protection against corrosion, and fracture control plans. Material Selection and Design Criteria
Recent assessments indicate that many existing natural gas pipelines do not automatically meet the stringent requirements of B31.12 for hydrogen service. For example, a natural gas pipeline operating at a hoop stress of 80% of SMYS would likely need a significant reduction in Maximum Operating Pressure (MOP), replacement, or a shift to the more demanding performance-based design (Option B) to comply with the standard. For pipeline engineers, this standard is essential for bridging the gap between conventional natural gas practices and the specialized demands of hydrogen transport.
: The current edition is available for purchase directly from the ASME Standards Store .