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ASME B31.3-2016 M322.6.3 Overpressure Protection M325 MATERIALS — MISCELLANEOUS (a) Paragraph 322.6.3(a) applies. M325.1 Joining and Auxiliary Materials (b) Relief set pressure shall be in accordance with BPV Code, Section VIII, Division 1. In applying para. 325, materials such as solvents, (c) The maximum relieving pressure shall be in accor- brazes,and solders shall not be used.Nonmetallic mate- dance with Section VIII, Division 1. rials used as gaskets and packing materials shall be suitable for the fluid service. PART 7 METALLIC MATERIALS PART 8 STANDARDS FOR PIPING COMPONENTS M323 GENERAL REQUIREMENTS M326 DIMENSIONS AND RATINGS OF M323.1 Materials and Specifications COMPONENTS Paragraph 323.1.1 applies. See paras. M323.1.2, Paragraph 326.1.3 applies. M323.1.3, and M323.1.4. M323.1.2 Unlisted Materials. Paragraph 323.1.2 M326.1 Dimensional Requirements applies, with the additional requirement that the M326.1.1 Listed Piping Components. Except for designer shall fully document the determination of prohibitions and restrictions stated elsewhere in allowable stresses as part of the engineering design. Chapter VIII, components made in accordance with M323.1.3 Unknown Materials. Materials of standards and specifications listed in Table 326.1 may unknown specification shall not be used. be used in Category M service. M323.1.4 Reclaimed Metallic Materials. Reclaimed M326.1.2 Unlisted Piping Components. materials may be used when the material certification Paragraph 326.1.2 applies, except that dimensions of records are available for the specific materials employed, unlisted components shall be governed by requirements and the designer is assured that the material is sound in paras. 303 and 304. and free from harmful defects. M326.2 Ratings of Components (16) M323.2 Temperature Limitations Paragraph 326.2 applies in its entirety. Paragraph 323.2 applies with the exception that, in M326.3 Reference Documents regard to lower temperature limits, the relaxation of minimum temperature limits stated in Notes(3)and (6) Paragraph 326.3 applies in its entirety. of Table 323.2.2 and in para. 323.2.2(d)is not permitted. M323.3 Impact Testing Methods and Acceptance PART 9 Criteria FABRICATION, ASSEMBLY, AND ERECTION OF METALLIC PIPING Paragraph 323.3 applies in its entirety. M327 GENERAL M323.4 Fluid Service Requirements for Metallic Metallic piping materials and components are pre- Materials pared for assembly and erection by one or more of Paragraph 323.4.1 applies. the fabrication processes in paras. M328, M330, M331, M323.4.2 Specific Requirements. Paragraph 323.4.2 and M332.When any of these processes is used in assem- applies, except that cast irons other than ductile iron bly and erection, requirements are the same as for shall not be used for pressure-containing parts,and lead fabrication. and tin shall be used only as linings. M323.4.3 Metallic Cladding and Lining Materials. M328 WELDING OF METALS In addition to the requirements of para. 323.4.3,where Welding shall be in accordance with paras. M311.1 materials covered in paras. 323.4.2(c)(2) and 323.4.3 are and 328, except see para. M328.3. used as cladding or lining in which the cladding or lining also serves as a gasket or as part of the flange M328.3 Welding Materials facing,consideration shall be given to the design of the Paragraph 328.3 applies in its entirety,except that split flanged joint to prevent leakage to the environment. backing rings shall not be used,and removable backing rings and consumable inserts may be used only where M323.5 Deterioration of Materials In Service their suitability has been demonstrated by procedure Paragraph 323.5 applies in its entirety. qualification.