ASME Code for Pressure Piping, B31 (Revision of ASME B31.3-2004) Chapter IScope and Definitions
ASME B31.3-2006
300 GENERAL STATEMENTS (a) Identification. This Process Piping Code is a Section of the American Society of Mechanical EngineersCode for Pressure Piping, ASME B31, an American National Standard. It is published as a separate docu-ment for convenience of Code users.(b) Responsibilities(1) Owner. The owner of a piping installation shall have overall responsibility for compliance with thisCode, and for establishing the requirements for design, construction, examination, inspection, and testingwhich will govern the entire fluid handling or process installation of which the piping is a part. The owner isalso responsible for designating piping in certain fluid services and for determining if a specific Quality Systemis to be employed. [See paras. 300(d)(4), (d)(5), (e), and Appendix Q.](2) Designer. The designer is responsible to the owner for assurance that the engineering design of pip-ing complies with the requirements of this Code and with any additional requirements established by theowner.(3) Manufacturer, Fabricator, and Erector. The manufacturer, fabricator, and erector of piping are responsiblefor providing materials, components, and workmanship in compliance with the requirements of this Code andof the engineering design.(4) Owner’s Inspector. The owner’s Inspector (see para. 340) is responsible to the owner for ensuring thatthe requirements of this Code for inspection, examination, and testing are met. If a Quality System is specifiedby the owner to be employed, the owner’s inspector is responsible for verifying that it is implemented.(c) Intent of the Code(1) It is the intent of this Code to set forth engineering requirements deemed necessary for safe design

and construction of piping installations.

(2) This Code is not intended to apply to the operation, examination, inspection, testing, maintenance, orrepair of piping that has been placed in service. The provisions of this Code may optionally be applied forthose purposes, although other considerations may also be necessary.(3) Engineering requirements of this Code, whileconsidered necessary and adequate for safe design, generally employ a simplified approach to the subject. Adesigner capable of applying a more rigorous analysis shall have the latitude to do so; however, the approachmust be documented in the engineering design and its validity accepted by the owner. The approach used shallprovide details of design, construction, examination, inspection, and testing for the design conditions of para.301, with calculations consistent with the design criteria of this Code.(4) Piping elements should, insofar as practicable, conform to the specifications and standards listed inthis Code. Piping elements neither specifically approved nor specifically prohibited by this Code may be usedprovided they are qualified for use as set forth in applicable Chapters of this Code.(5) The engineering design shall specify any unusual requirements for a particular service. Whereservice requirements necessitate measures beyond those required by this Code, such measures shall be specifiedby the engineering design. Where so specified, the Code requires that they be accomplished.(6) Compatibility of materials with the service and hazards from instability of contained fluids are notwithin the scope of this Code. See para. F323.(d) Determining Code Requirements(1) Code requirements for design and construction include fluid service requirements, which affect selectionand application of materials, components, and joints. Fluid service requirements include prohibitions, limita-tions, and conditions, such as temperature limits or a requirement for safeguarding (see para. 300.2 andAppendix G). Code requirements for a piping system are the most restrictive of those which apply to any ofits elements.(2) For metallic piping not in Category M or high pressure fluid service, Code requirements are found inChapters I through VI (the base Code), and fluid service requirements are found in(a) Chapter III for materials(b) Chapter II, Part 3, for components(c) Chapter II, Part 4, for joints(3) For nonmetallic piping and piping lined with nonmetals, all requirements are found in Chapter VII.(Paragraph designations begin with “A.”)(4) For piping in a fluid service designated by the owner as Category M (see para. 300.2 and Appendix M),all requirements are found in Chapter VIII. (Paragraph designations begin with “M.”)(5) For piping in a fluid service designated by the owner as Category D (see para. 300.2 and Appendix M), iping elements restricted to Category D Fluid Service in chaters I through VII, as well as elements suitablefor other fluid services, may be used.(6) Metallic piping elements suitable for Normal Fluid Service in Chapters I through VI may also beused under severe cyclic conditions unless a specific requirement for severe cyclic conditions is stated.(e) High Pressure Piping. Chapter IX provides alternative rules for design and construction of piping desig-nated by the owner as being in High Pressure Fluid Service.(1) These rules apply only when specified by the owner, and only as a whole, not in part.(2) Chapter IX rules do not provide for Category M Fluid Service. See para. K300.1.4.(3) Paragraph designations begin with “K.”(f ) Appendices. Appendices of this Code contain Code requirements, supplementary guidance, or otherinformation. See para. 300.4 for a description of the status of each Appendix.

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