Rules for this Code Section have been developed consideringthe needs for applications which include pipingtypically found in electric power generating stations, inindustrial and institutional plants, geothermal heatingsystems, and central and district heating and coolingsystems.100.1.1 This Code prescribes requirements for thedesign, materials, fabrication, erection, test, inspection,operation, and maintenance of piping systems.Piping as used in this Code includes pipe, flanges,bolting, gaskets, valves, relief devices, fittings, and thepressure containing portions of other piping components,whether manufactured in accordance with Standardslisted in Table 126.1 or specially designed. It alsoincludes hangers and supports and other equipmentitems necessary to prevent overstressing the pressurecontaining components.Rules governing piping for miscellaneous appurtenances,such as water columns, remote water level indicators,pressure gages, gage glasses, etc., are includedwithin the scope of this Code, but the requirements forboiler appurtenances shall be in accordance with SectionI of the ASME Boiler and Pressure Vessel Code, PG-60.The users of this Code are advised that in some areaslegislation may establish governmental jurisdiction overthe subject matter covered by this Code. However, anysuch legal requirement shall not relieve the owner ofhis inspection responsibilities specified in para. 136.1.1100.1.2 Power piping systems as covered by thisCode apply to all piping and their component partsexcept as excluded in para. 100.1.3. They include butare not limited to steam, water, oil, gas, and air services.(A) This Code covers boiler external piping as definedbelow for power boilers and high temperature, highpressurewater boilers in which: steam or vapor is generatedat a pressure of more than 15 psig [100 kPa (gage)];and high temperature water is generated at pressuresexceeding 160 psig [1 103 kPa (gage)] and/or temperaturesexceeding 250°F (120°C).Boiler external piping shall be considered as that pipingwhich begins where the boiler proper terminates at(1) the first circumferential joint for welding endconnections; or(2) the face of the first flange in bolted flangedconnections; or(3) the first threaded joint in that type of connection;and which extends up to and including the valveor valves required by para. 122.1.The terminal points themselves are considered part ofthe boiler external piping. The terminal points and pipingexternal to power boilers are illustrated byFigs. 100.1.2(A.1), 100.1.2(A.2), 100.1.2(B), and100.1.2(C).Piping between the terminal points and the valve orvalves required by para. 122.1 shall be provided withData Reports, inspection, and stamping as required bySection I of the ASME Boiler and Pressure Vessel Code.All welding and brazing of this piping shall be performedby manufacturers or contractors authorized touse the appropriate symbol shown in Figs. PG-105.1through PG-105.3 of Section I of the ASME Boiler andPressure Vessel Code. The installation of boiler externalpiping by mechanical means may be performed by anorganization not holding a Code symbol stamp. However,the holder of a valid S, A, or PP Certificate ofAuthorization shall be responsible for the documentationand hydrostatic test, regardless of the method ofassembly. The quality control system requirements ofSection I of the ASME Boiler and Pressure Vessel Codeshall apply. These requirements are shown in Appendix Jof this Code.
ASME B31.1B-2009 history
2009ASME B31.1B-2009 Addenda to ASME B31.1-2007 Power Piping ASME Code for Pressure Piping, B31