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| ASME B31.1 |
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ASME B31.1 - Power Piping
Date of Issuance: Dec. 10, 2001
Mandatory Date: June 10, 2002
This Edition was approved by the American National Standards Institute and designated ASME B31.1-2001 on July 2, 2001
Scope (abbreviated)
This Code prescribes requirements for the design, materials, fabrication, erection, test, and inspection of piping systems.
Piping as used in this Code includes pipe, flanges, bolting, gaskets, valves, relief devices, fittings, and the pressure containing portions of other piping components, whether manufactured in accordance with Standards listed in Table 126.1 or specially designed. It also includes hangers and supports and other equipment items necessary to prevent overstressing the pressure containing components.
Rules governing piping for miscellaneous appurtenances, such as water columns, remote water level indicators, pressure gages, gage glasses etc., are included within the scope of this Code, but the requirements for boiler appurtenances shall be in accordance with Section I of the ASME Boiler and Pressure Vessel Code, PG-60.
Power piping systems as covered by this Code apply to all piping and their component parts except as excluded in para. 100.1.3. They include but are not limited to steam, water, oil, gas, and air services.
(A) This Code covers boiler external piping as defined below 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 [100 kPa (gage)]; and high temperature water is generated at pressures exceeding 160 psig [1103 kPa (gage)] and/or temperatures exceeding 250°F (120°C).
Boiler external piping shall be considered as that piping which begins where the boiler proper terminates at:
(1) the first circumferential joint for welding end connections; or
(2) the face of the first flange in bolted flanged connections; or
(3) the first threaded joint in that type of connection; and which extends up to and including the valve or valves required by para. 122.1.
The terminal points themselves are considered part of the boiler external piping. The terminal points and piping external to power boilers are illustrated by Figs. 100.1.2(A), 100.1.2(B), and 100.1.2(C).
Piping between the terminal points and the valve or valves required by para. 122.1 shall be provided with Data Reports, inspection, and stamping as required by Section I of the ASME Boiler and Pressure Vessel Code. All welding and brazing of this piping shall be performed by manufacturers or contractors authorized to use the appropriate symbol shown in Figs. PG-105.1 through PG-105.3 of Section I of the ASME Boiler and Pressure Vessel Code. The installation of boiler external piping by mechanical means may be performed by an organization not holding a Code symbol stamp. However, the holder of a valid S, A, or PP Certificate of Authorization shall be responsible for the documentation and hydrostatic test, regardless of the method of assembly. The quality control system requirements of Section I of the ASME Boiler and Pressure Vessel Code shall apply. These requirements are shown in Appendix J of this Code.
The valve or valves required by para. 122.1 are part of the boiler external piping, but do not require ASME Boiler and Pressure Vessel Code, Section I inspection and stamping except for safety, safety relief, and relief valves, see para. 107.8.2. Refer to PG-11.
Pipe connections meeting all other requirements of this Code but not exceeding NPS 1.2 may be welded to pipe or boiler headers without inspection and stamping required by Section I of the ASME Boiler and Pressure Vessel Code.
Nonboiler external piping includes all the piping covered by this Code except for that portion defined above as boiler external piping.
This Code does not apply to the following:
(A) economizers, heaters, pressure vessels, and components covered by Sections of the ASME Boiler and Pressure Vessel Code;
(B) building heating and distribution steam and condensate piping designed for 15 psig [100 kPa(gage)] or less, or hot water heating systems designed for 30 psig [200 kPa (gage)] or less;
(C) piping for hydraulic or pneumatic tools and their components downstream of the first block or stop valve off the system distribution header;
(D) piping for marine or other installations under Federal control;
(E) towers, building frames, tanks, mechanical equipment, instruments, and foundations.
Reference Standards
Specifications and standards of the following organizations, appear in Appendix E of ASME B31.3
ANSI (American National Standards Institute)
API (American Petroleum Institute)
ASCE (The American Society of Civil Engineers)
ASME (ASME International)
ASNT (American Society for Nondestructive Testing Inc.)
ASTM (ASTM International)
AWWA (American Water Works Association)
AWS (American Welding Society)
MSS (Manufacturers Standardization Society of the Valve and Fittings Industry Inc.)
NFPA (National Fire Protection Association)
PFI (Pipe Fabrication Institute)
PPI (Plastics Pipe Institute)
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