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To the greatest possible extent,Code requirements for design are stated in terms of basic design principles and formulas. These are supplemented as necessary with specific requirements to ensure uniform application of principles and to guide selection and application of piping elements. The Code prohibits designs and practices known to be unsafe and contains warnings where caution,but not prohibition,is warranted. This Code Section includes the following: (a) references to acceptable material specifications and component standards,including dimen- sional requirements and pressure—temperature ratings (b) requirements for design of components and assemblies,including piping supports (c) requirements and data for evaluation and limitation of stresses,reactions,and movements associated with pressure, temperature changes, and other forces (d) guidance and limitations on the selection and application of materials, components, and joining methods (e) requirements for the fabrication, assembly, and erection of piping 0 requirements for examination,inspection, and testing of piping ASME Committee B31 is organized and operates under procedures of The American Society of Mechanical Engineers that have been accredited by the American National Standards Institute. The Committee is a continuing one,and keeps all Code Sections current with new developments in materials,construction,and industrial practice.New editions are published at intervals of two years. Code users will note that paragraphs in the Code are not necessarily numbered consecutively. Such discontinuities result from following a common outline, insofar as practical, for all Code Sections.In this way,corresponding material is correspondingly numbered in most Code Sections, thus facilitating reference by those who have occasion to use more than one Section. It is intended that this edition of Code Section B31.3 not be retroactive. Unless agreement is specifically made between contracting parties to use another issue,or the regulatory body having jurisdiction imposes the use of another issue,the latest edition issued at least 6 months prior to the original contract date for the first phase of activity covering a piping installation shall be the governing document for all design,materials,fabrication, erection,examination,and testing for the piping until the completion of the work and initial operation. Users of this Code are cautioned against making use of Code revisions without assurance that they are acceptable to the proper authorities in the jurisdiction where the piping is to be installed. The B31 Committee has established an orderly procedure to consider requests for interpretation and revision of Code requirements. To receive consideration, such request must be in writing and must give full particulars in accordance with Appendix Z. The approved reply to an inquiry will be sent directly to the inquirer. In addition,the question and reply will be published as part of an Interpretation supplement. A Case is the prescribed form of reply when study indicates that the Code wording needs clarification, or when the reply modifies existing requirements of the Code or grants permission to use new materials or alternative constructions. The Case will be published as part of a Case supplement. Code Cases remain available for use until annulled by the ASME B31 Standards Committee. A request for revision of the Code will be placed on the Committee's agenda.Further information or active participation on the part of the proponent may be requested during consideration of a proposed revision. Materials ordinarily are listed in the stress tables only when sufficient usage in piping within the scope of the Code has been shown. Requests for listing shall include evidence of satisfactory usage and specific data to permit establishment of allowable stresses, maximum and minimum temperature limits,and other restrictions. Additional criteria can be found in the guidelines for addition of new materials in the ASME Boiler and Pressure Vessel Code,Section IL (To develop usage and gain experience, unlisted materials may be used in accordance with para. 323.1.2.)