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ASME B31.3-2016 <br /> K321.1.4 Materials. Paragraph 321.1.4 applies,but other unexpected sources of external heat shall be set <br /> replace (e) with the following: to operate at a pressure not greater than 110% of the <br /> (e) Attachments welded to the piping shall be of a design pressure of the piping system and shall be capa- <br /> material compatible with the piping and the service. ble of limiting the maximum pressure during relief to <br /> Other requirements are specified in paras. K321.3.2 and no more than 121% of the design pressure. <br /> K323.4.2(b). <br /> K321.3 Structural Attachments PART 7 <br /> MATERIALS <br /> K321.3.2 Integral Attachments. Paragraph 321.3.2 K323 GENERAL REQUIREMENTS <br /> applies,but substitute"K321.1.4(e)"for"321.1.4(e)"and <br /> "Chapter IX" for "Chapter V." (a) Paragraph K323 states limitations and required <br /> qualifications for materials based on their inherent prop- <br /> PART 6 erties.Their use is also subject to requirements elsewhere <br /> SYSTEMS in Chapter IX and in Table K-1. <br /> K322 SPECIFIC PIPING SYSTEMS (b) Specific attention should be given to the manufac- <br /> turing process to ensure uniformity of properties <br /> K322.3 Instrument Piping throughout each piping component. <br /> K322.3.1 Definition. Instrument piping within the (c) See para. K321.1.4 for support materials. <br /> scope of this Chapter includes all piping and piping K323.1 Materials and Specifications <br /> components used to connect instruments to high pres- K323.1.1 Listed Materials <br /> sure piping or equipment. Instruments, permanently (a) Any material used in a pressure-containing piping <br /> sealed fluid-filled tubing systems furnished with instru- <br /> ments as temperature- or pressure-responsive devices, component shall conform to a listed specification,except <br /> and control piping for air or hydraulically operated con- as provided in (b) below or in para. K323.1.2. <br /> trol apparatus (not connected directly to the high pres- (b) Materials manufactured to specification editions <br /> sure piping or equipment) are not within the scope of different from those listed in Appendix E may be used, <br /> this Chapter. provided <br /> (1) the requirements for chemical composition and <br /> K322.3.2 Requirements. Instrument piping within heat-treatment condition in the edition of the specifica- <br /> the scope of this Chapter shall be in accordance with tion to which the material was manufactured meet the <br /> para.322.3.2 except that the design pressure and temper- requirements of the listed edition <br /> ature shall be determined in accordance with para.K301, (2) the specified minimum tensile and yield <br /> and the requirements of para. K310 shall apply. Instru- strengths,and,if applicable,the specified maximum ten- <br /> ments, and control piping not within the scope of this sile and yield strengths,required by the two editions of <br /> Chapter, shall be designed in accordance with the specification are the same, and <br /> para. 322.3. (3) the material has been tested and examined in <br /> K322.6 Pressure-Relieving Systems accordance with the requirements of the listed edition <br /> of the specification <br /> Paragraph 322.6 applies, except for para. 322.6.3. A material that does not meet the requirements of <br /> K322.6.3 Overpressure Protection. Overpressure paras. K323.1.1(b)(1), (2), and (3) may be evaluated as <br /> protection for high pressure piping systems shall con- an unlisted material in accordance with para. K323.1.2. <br /> form to the following: K323.1.2 Unlisted Materials. An unlisted material <br /> (a) The cumulative capacity of the pressure-relieving may be used,provided it conforms to a published speci- <br /> devices shall be sufficient to prevent the pressure from fication covering chemistry, physical and mechanical <br /> rising more than 10%above the piping design pressure properties, method and process of manufacture, heat <br /> at the operating temperature during the relieving condi- treatment,and quality control,and otherwise meets the <br /> tion for a single relieving device or more than 16%above requirements of this Chapter.Allowable stresses shall be <br /> the design pressure when more than one device is pro- determined in accordance with the applicable allowable <br /> vided, except as provided in (c) below. stress basis of this Chapter or a more conservative basis. <br /> (b) System protection must include one relief device <br /> set at or below the design pressure at the operating K323.1.3 Unknown Materials. Materials of <br /> unknown specification,type,or grade are not permitted. <br /> temperature for the relieving condition,with no device <br /> set to operate at a pressure greater than 105% of the K323.1.4 Reclaimed Materials. Reclaimed pipe and <br /> design pressure, except as provided in (c) below. other piping components may be used provided they <br /> (c) Supplementary pressure-relieving devices pro- are properly identified as conforming to a listed specifi- <br /> vided for protection against overpressure due to fire or cation,have documented service history for the material <br />