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ASME B31.3-2016 system shall also comply with the following and of the approach taken in using the material,includ- requirements: ing the derivation of stress data and the establishment (-a) The piping shall be subjected to a leak test of temperature limits. at no less than 1%2 times the design pressure. (b) Data for the development of design limits shall (-b) Except for piping with a nominal wall thick- be obtained from a sound scientific program carried out ness of 13 mm (1/2 in.) or less, the piping system shall in accordance with recognized technology for both the be safeguarded (see Appendix G) from external loads material and the intended service conditions.Factors to such as maintenance loads, impact loads, and thermal be considered include shock. (1) applicability and reliability of the data, espe- (2) For design minimum temperatures lower than cially for extremes of the temperature range —48°C (-55°F),impact testing is required for all materi- (2) resistance of the material to deleterious effects als, except as provided by General Note (b) of of the fluid service and of the environment throughout Fig. 323.2.2B. the temperature range (e) The allowable stress or component rating at any (3) determination of allowable stresses in accor- temperature below the minimum shown in Table A-1, dance with para. 302.3 Table A-IM, or Fig. 323.2.2A shall not exceed the stress 323.3 Impact Testing Methods and Acceptance value or rating at the minimum temperature in Criteria Table A-1, Table A-IM, or the component standard. (f) Impact testing is not required for the following 323.3.1 General. When impact testing is required combinations of weld metals and design minimum by Table 323.2.2, provisions elsewhere in this Code, or temperatures: the engineering design, it shall be done in accordance (1) for austenitic stainless steel base materials hav- with Table 323.3.1 using the testing methods and accept- ing a carbon content not exceeding 0.10%,welded with- ance criteria described in paras. 323.3.2 through 323.3.5. out filler metal, at design minimum temperatures of 323.3.2 Procedure. Impact testing of each product —101°C (-150°F) and higher form of material for any specification (including welds (2) for austenitic weld metal in the components)shall be done using procedures and (-a) having a carbon content not exceeding 0.10%, apparatus in accordance with ASTM A370.For material and produced with filler metals conforming to forms that are represented by the ASTM specifications AWS A5.4,A5.9,A5.11,A5.14,or A5.221 at design mini- listed below,impact tests shall be conducted in confor- mum temperatures of —101°C (-150°F) and higher, or mance with those requirements as well. When conflicts (-b) having a carbon content exceeding 0.10%, exist between the specific requirements of this Code and and produced with filler metals conforming to the requirements of those specifications, the require- AWS A5.4,A5.9,A5.11,A5.14,or A5.221 at design mini- ments of this Code shall take precedence. mum temperatures of —48°C (-55°F) and higher Product Form ASTM Spec.No. 323.2.3 Temperature Limits, Unlisted Materials. An Pipe A333 unlisted material, acceptable under para. 323.1.2, shall Tube A334 be qualified for service at all temperatures within a Fittings A420 Forgings A350 stated range, from design minimum temperature to Castings A352 design maximum temperature, in accordance with Bolting A320 para. 323.2.4. Plate A20 323.2.4 Verification of Serviceability GENERAL NOTE: Titles of referenced standards not listed in the Specifications Index for Appendix Aare A20 General Requirements (a) When an unlisted material is to be used,or when for Steel Plates for Pressure Vessels and A370 Test Methods and a listed material is to be used above the highest tempera- Definitions for Mechanical Testing of Steel Products. ture for which stress values appear in Appendix A,the 323.3.3 Test Specimens. Each set of impact test designer is responsible for demonstrating the validity specimens shall consist of three specimen bars. All of the allowable stresses and other limits used in design impact tests shall be made using standard 10 mm (0.394 in.)square cross section Charpy V-notch specimen i bars,except when the material shape or thickness does Titles of referenced AWS standards are as follows:AWS A5.4, not permit. Char act tests may be performed on Stainless Steel Electrodes for Shielded Metal Arc Welding; p p5 impact y p AWS A5.9, Bare Stainless Steel Welding Electrodes and Rods; specimens of full material thickness, which may be AWS A5.11,Nickel and Nickel Alloy Welding Electrodes for machined to remove surface irregularities.Alternatively, Shielded Metal Arc Welding;AWS A5.14,Nickel and Nickel Alloy such material may be reduced in thickness to produce Bare Welding Electrodes and Rods; and AWS A5.22,Flux Cored Corrosion-Resisting Chromium and Chromium-Nickel Steel the largest possible Charpy subsize specimen. See Electrodes. Table 323.3.4.