ASME B31.1-2020

ASME B31.1 2020 Edition – Power Piping

This Code 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.

ASME B31.1 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

ASME B31.1 is one of ASME’s most requested codes, widely adopted by jurisdictions worldwide. It is prominently referenced in ASME Boiler and Pressure Vessel Code Section I.

This Code serves as a companion to ASME B31.3 Code on Process Piping as well as to the other codes in ASME B31 series. Together, they remain essential references for anyone engaged with piping. Intended for manufacturers, designers, operators and owners of piping systems including, but not limited to, steam, water, oil, gas, and air services, plus all potential governing entities.