ASME B31.1 prescribes minimum requirements for the design, materials, fabrication, erection, test, inspection, operation, and maintenance of piping systems typically found in electric power generating stations, industrial and institutional plants, geothermal heating systems, and central and district heating and cooling systems.



It also covers boiler-external piping for power boilers and high-temperature, high pressure water boilers in which steam or vapor is generated at a pressure of more than 15 psig, and high temperature water is generated at pressures exceeding 160 psig and/or temperatures exceeding 250 degrees F.



Key changes to this revision include:

- New and updated figures for Code Jurisdictional Limits on Piping

- New Mandatory Appendix on Metallic Bellows Expansion Joints

- New Mandatory Appendix on Use of Alternative Ultrasonic Acceptance Criteria

- Reference to ASME CA-1, Conformity Assessment Requirements