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ASME B31.8-2016 pdf download

ASME B31.8-2016 pdf download.Gas Transmission and Distribution Piping Systems.
801 GENERAL 801.1 Approved Standards and Specifications Standards and specifications approved for use under this Code and the names and addresses of the sponsor- ing organizations are shown in Mandatory Appendix A. It is not considered practicable to refer to a specific edition of each of the standards and specifications in the individual Code paragraphs. 801.2 Use of Standards and Specifications Incorporated by Reference Some standards and specifications cited in Mandatory Appendix A are supplemented by specific requirements elsewhere in this Code. Users of this Code are advised against attempting direct application of any of these standards without carefully observing the Code’s refer- ence to that standard. 801.3 Standard Dimensions Adherence to American National Standards Institute (ANSI) dimensions is strongly recommended wherever practicable. Paragraphs or notations specifying these and other dimensional standards in this Code, however, shall not be mandatory, provided that other designs of at least equal strength and tightness, capable of with- standing the same test requirements, are substituted. 801.4 SI (Metric) Conversion For factors used in converting U.S. Customary units to SI units, see Nonmandatory Appendix J. 802 SCOPE AND INTENT 802.1 Scope (a) This Code covers the design, fabrication, installa- tion, inspection, and testing of pipeline facilities used forthetransportationofgas. This Codealso covers safety aspects of the operation and maintenance of those facili- ties. (See Mandatory Appendix Q for scope diagrams.) This Code is concerned only with certain safety aspects of liquefied petroleum gases when they are 1 vaporized and used as gaseous fuels. All of the require- ments of NFPA 58 and NFPA 59 and of this Code con- cerning design, construction, and operation and maintenance of piping facilities shall apply to piping systems handling butane, propane, or mixtures of these gases. (b) This Code does not apply to (1) design and manufacture ofpressure vessels cov- ered by the BPV Code 1 (2) piping with metal temperatures above 450°F (232°C) (For low-temperature considerations, see para. 812.) (3) piping beyond the outlet of the customer’s meter set assembly (Refer to ANSI Z223.1/NFPA 54.) (4) piping in oil refineries or natural gasoline extraction plants, gas treating plant piping other than the main gas stream piping in dehydration, and all other processing plants installed as part of a gas transmission system, gas manufacturing plants, industrial plants, or mines (See other applicable sections of the ASME Code for Pressure Piping, B31.) (5) vent piping to operate at substantially atmo- spheric pressures for waste gases of any kind (6) wellhead assemblies, including control valves, flow lines between wellhead and trap or separator, off- shore platform production facility piping, or casing and tubing in gas or oil wells (For offshore platform produc- tion facility piping, see API RP 14E.) (7) the design and manufacture of proprietary items of equipment, apparatus, or instruments (8) the design and manufacture of heat exchangers (Refer to appropriate TEMA 2 standard.) (9) liquid petroleum transportation piping systems (Refer to ASME B31.4.) (10) liquid slurry transportation piping systems (Refer to ASME B31.4.)
802.2 Intent 802.2.1 Adequacy for Normal Conditions. The requirements of this Code are adequate for safety under conditions usually encountered in the gas industry. Requirements for all unusual conditions cannot be spe- cifically provided for, nor are all details of engineering and construction prescribed; therefore, activities involv- ing the design, construction, operation, or maintenance of gas transmission, gathering, or distribution pipelines should be undertaken using supervisory personnel hav- ing the experience or knowledge to make adequate pro- vision for such unusual conditions and specific engineering and construction details. All work per- formed within the scope of this Code shall meet or exceed the safety standards expressed or implied herein. 802.2.2 More Complete Analysis. The Code gener- ally specifies a simplified approach for many of its requirements. (a) For design and construction, a designer may choose to use a more rigorous analysis to develop design and construction requirements. When the designer decides to take this approach, the designer shall provide to the operating company details and calculations dem- onstrating that design, construction, examination, and testingare consistentwiththe criteria ofthis Code. These details shall be adequate for the operating company to verify the validity ofthe approach and shall be approved by the operating company. The details shall be docu- mented in the engineering design. (b) Foroperationandmaintenance,anoperatingcom- pany may choose to use a more rigorous analysis to develop operation and maintenance requirements. When the operating company decides to take this approach, the operating company shall provide details and calculations demonstrating that such alternative practices are consistent with the objectives of this Code. The details shall be documented in the operating records and retained for the lifetime of the facility. 802.2.3 Safety. This Code is concerned with (a) safety of the general public. (b) employee safety to the extent that it is affected by basic design, qualityofmaterials and workmanship, and requirements for testing, operations, and maintenance of gas transmission and distribution facilities. Existing industrial safety procedures pertaining to work areas, safety devices, and safe work practices are not intended to be supplanted by this Code.

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