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ASME B31.3-2016 and fatigue life evaluation, and otherwise meet the governed by the creep or stress rupture provisions of requirements of this Chapter. Sufficient cleaning and that paragraph. inspection shall be made to determine minimum wall K323.2.4 Verification of Serviceability thickness and freedom from defects that would be unac- ceptable in the intended service. (a) When an unlisted material is used,or when other- wise required by Appendix K, Table K-1, Note (9), the K323.1.5 Product Analysis. Conformance of materi- designer is responsible for demonstrating the validity als to the product analysis chemical requirements of the of the allowable stresses and other design limits,and of applicable specification shall be verified, and certifica- the approach taken in using the material,including the tion shall be supplied.Requirements for product analysis derivation of stress data and the establishment of tem- are defined in the applicable materials specification. perature limits. K323.1.6 Repair of Materials by Welding. A material (b) Paragraph 323.2.4(b)applies except that allowable defect may be repaired by welding,provided that all of stress values shall be determined in accordance with the following criteria are met: para. K302.3. (a) The material specification provides for weld K323.3 Impact Testing Methods and Acceptance repair. Criteria (b) The welding procedure and welders or welding operators are qualified as required by para. K328.2. K323.3.1 General. Except as provided in (16) (c) The repair and its examination are performed in Table K323.3.1, Note (2), piping components used in accordance with the material specification and with the High Pressure Fluid Service shall be subjected to Charpy V-notch impact testing. The testing shall be performed owner's approval. in accordance with Table K323.3.1 on representative K323.2 Temperature Limitations samples using the testing methods described in paras. K323.3.2,K323.3.3,and K323.3.4. Acceptance cri- The designer shall verify that materials that meet other teria are described in para. K323.3.5. requirements of this Chapter are suitable for service throughout the operating temperature range.Attention K323.3.2 Procedure. Paragraph 323.3.2 applies. is directed to Note(4)in Appendix K,and para.K323.2.1 K323.3.3 Test Specimens (16) following. (a) Each set of impact test specimens shall consist of K323.2.1 Upper Temperature Limits, Listed three specimen bars. Impact tests shall be made using Materials. A listed material shall not be used at a tem- standard 10 mm (0.394 in.) square cross section Charpy perature above the maximum for which a stress value V-notch specimen bars oriented in the transverse is shown in Appendix K,Table K-1,except as provided direction. in Note (9) of that table. (b) Where component size and/or shape does not per- mit specimens as specified in(a)above,standard 10 mm (16) K323.2.2 Lower Temperature Limits,Listed Materials square cross-section longitudinal Charpy specimens (a) The lowest permitted service temperature for a may be prepared. component or weld shall be the impact test temperature (c) Where component size and/or shape does not per- determined in accordance with para.K323.3.4(a),except mit specimens as specified in (a) or (b) above, subsize as provided in (b) or (c) below. longitudinal Charpy specimens may be prepared. Test (b) For a component or weld subjected to a longitudi- temperature shall be reduced in accordance with nal or circumferential stress<— 41 MPa(6 ksi),the lowest Table 323.3.4. See also Table K323.3.1, Note (2). service temperature shall be the lower of—46°C (-50°F) (d) If necessary in (a), (b), or (c) above, corners of or the impact test temperature determined in specimens parallel to and on the side opposite the notch para. K323.3.4(a). may be as shown in Fig. K323.3.3. (c) For materials exempted from Charpy testing by K323.3.4 Test Temperatures. For all Charpy impact Note(2) of Table K323.3.1,the service temperature shall tests the test temperature criteria in (a) or (b) below not be lower than —46°C (-50°F). shall be observed. K323.2.3 Temperature Limits, Unlisted Materials. (a) Charpy impact tests shall be conducted at a tem- An unlisted material acceptable under para. K323.1.2 perature no higher than the lower of the following: shall be qualified for service at all temperatures within (1) 20°C (70°F) a stated range from design minimum temperature to (2) the lowest metal temperature at which a piping design (maximum) temperature, in accordance with component or weld will be subjected to a stress greater para. K323.2.4. However, the upper temperature limit than 41 MPa(6 ksi).In specifying the lowest metal tem- shall be less than the temperature for which an allowable perature, the following shall be considered: stress, determined in accordance with para. 302.3.2, is (a) range of operating conditions