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ASME B31.3-2016 PART 6 and if the designer verifies the serviceability of the mate- SYSTEMS rial in accordance with para. 323.2.4. A322 SPECIFIC PIPING SYSTEMS A323.2.2 Lower Temperature Limits,Listed Materials A322.3 Instrument Piping (a) Materials for use at design minimum tempera- tures below certain limits must usually be tested Paragraph 322.3 applies in its entirety,except that ref- to determine that they have suitable toughness for use erences to paras. A301 and A302.2.4 replace references in Code piping. Table A323.2.2 sets forth those to paras. 301 and 302.2.4, respectively. p p g requirements. A322.6 Pressure-Relieving Systems (b) When materials are qualified for use at tempera- tures below the minimum temperature listed in Paragraph 322.6 applies in its entirety, except for Appendix B,the allowable stresses or pressures shall not para. 322.6.3. See para. A322.6.3. exceed the values for the lowest temperatures shown. A322.6.3 Overpressure Protection. Paragraph (c) See also the recommended limits in 322.6.3 applies,except that maximum relieving pressure Table A323.4.2C for reinforced thermosetting resin pipe shall be in accordance with para. A302.2.4. and in Table A323.4.3 for thermoplastics used as linings. A323.2.3 Temperature Limits, Unlisted Materials. PART 7 Paragraph 323.2.3 applies. MATERIALS A323.2.4 Verification of Serviceability. When an A323 GENERAL REQUIREMENTS unlisted material is to be used,or when a listed material A323.1 Materials and Specifications is to be used above or below the limits in Appendix B Paragraph 323.1 applies except for para. 323.1.4. See or Table A323.4.2C or Table A323.4.3,the designer shall comply with the requirements of para. 323.2.4. para. A323.1.4. A323.1.4 Reclaimed Materials. Reclaimed piping A323.4 Fluid Service Requirements for Nonmetallic components may be used, provided they are properly Materials identified as conforming to a listed or published specifi- cation(see para.323.1.1)and otherwise meet the require- ments of this Code. The user shall verify that (a) Nonmetallic materials shall be safeguarded components are suitable for the intended service. Suffi- against excessive temperature, shock, vibration,pulsa- cient cleaning, examination, and testing shall be per- tion, and mechanical abuse in all fluid services. formed to determine the minimum available wall (b) Requirements in para. A323.4 apply to pressure- thickness and freedom from any of the following to containing parts. They do not apply to materials used an extent that would be unacceptable in the intended for supports,gaskets, or packing. See also Appendix F, service: para. FA323.4. (a) imperfections (b) reduction of mechanical properties, or A323.4.2 Specific Requirements (c) absorption of deleterious substances (a) Thermoplastics (1) They shall not be used in flammable fluid ser- A323.2 Temperature Limitations vice above ground, unless all of the following are met: The designer shall verify that materials that meet other (a) The size of the piping does not exceed DN 25 requirements of the Code are suitable for service (NPS 1). throughout the operating temperature range. Also see (b) Owner's approval is obtained. the Notes for Tables B-1 through B-5 in Appendix B. (c) Safeguarding in accordance with Appendix G A323.2.1 Upper Temperature Limits,Listed Materials is provided. (a) Except as provided in (b)below,a listed material (d) The precautions of Appendix F, paras. shall not be used at a design temperature higher than F323.1(a) through (c) are considered. the maximum for which a stress value or rating is shown, (2) They shall be safeguarded when used in other or higher than the maximum recommended temperature than Category D Fluid Service. in Table A323.4.2C for RTR materials and in (3) PVC and CPVC shall not be used in compressed Table A323.4.3 for thermoplastics used as linings. air or other compressed gas service. (b) A listed material may be used at a temperature (b) Reinforced Plastic Mortars (RPM) Piping. This pip- higher than the maximum stated in (a)above if there is ing shall be safeguarded when used in other than no prohibition in Appendix B or elsewhere in the Code, Category D Fluid Service.