35. ASME Piping Code: B31.1, Power Piping
Jim Meyer is a principal engineer for CDM Smith, in addition he frequently teaches ASME B31 Pressure Piping courses all over the world for ASME. He has a BSME from Akron University and has been in the working in the piping industry since 1973. His experiences are in Refinery, Chemical, Coal and Nuclear Power and Cryogenic Piping Systems.
Mrs. Kristi Vilminot is the Director of Engineering Power Generation and Energy/System Studies and the Director of Project Management at Commonwealth Associates Inc. Kristi has over 28 years of experience in power engineering with an emphasis on critical system piping design across all fuel types. Project types have included coal plants, combined and simple cycle plant, biomass plants and institutional power generation. Kristi has been a member of ASME B31.1 Code Committee for 20 years and has served as Vice Chairman of ASME B31.1 and Chairman of the Design Subgroup. Kristi is currently Vice Chair of ASME B31 Standards Committee.
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This chapter covers the ASME B31.1 Power Piping Code and provides additional insight into the proper use of the Code. The chapter intends to supplement and provide additional insight to the proper use of the Code. It begins with a discussion of the conditions or considerations for the design of piping systems; the basis of the allowable stresses, quality factors, etc. to be used for the design of piping systems; and the requirements for pressure design of piping components. The chapter briefly addresses various piping components or types of piping joints which might be limited to nonhazardous or nonflammable fluids, size limitation, pressure, and temperature limits. It also addresses the requirements for designing power piping systems subject to thermal expansion, contraction, or other displacement stress producing loads. The chapter then provides information on the factors to be considered during the design of pipe supports and those piping systems typically found in power generating facilities. It presents some examples of how the piping codes are interrelated for some common carbon steel and stainless steel Pressure Rating/Dimensional Standards, Material Forming Standards, and Material Grades. The chapter lists the acceptable standards for Code construction such as ASME, API, AWWA, ASTM, etc. It then addresses the requirements for fabrication, assembly, inspection, examination, testing, and maintenance of piping systems. A number of appendices are included in the Code. The Mandatory Appendices contain information on allowable stress, thermal expansion data, moduli of elasticity, stress intensification factors and rules for nonmetallic pipes to name a few. The Nonmandatory Appendices include information on safety valves, corrosion, and operation and maintenance and more.
Charles Becht IV was the author of “Chapter 16” titled “B31.1 Power Piping” for the original, second and third editions. Chapter 17 of the third edition was revised in its entirety and renumbered as Chapter 36 in the fourth edition. The fifth edition was authored by Jimmy E. Meyer and Joe Frey. The current online edition has been updated by Jimmy E. Meyer and Kristi A. Vilminot.