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ASME B31.3-2016 <br /> M308.5 Blanks confined seating surface not subject to relative rotation <br /> All blanks shall be marked with material, rating, as or after the jointis tightened. [See Fig.335.3.3 sketches <br /> and size. (b) and (c) for acceptable construction.] <br /> M309 BOLTING M315 TUBING JOINTS IN METALLIC PIPING <br /> Paragraph 309 applies, except for para. 309.2.4 [see Paragraph 315 applies, except for para. 315.2(b). <br /> para. M300(e)]. <br /> M316 CAULKED JOINTS <br /> PART 4 Caulked joints shall not be used. <br /> FLUID SERVICE REQUIREMENTS FOR METALLIC <br /> PIPING JOINTS <br /> M317 SOLDERED AND BRAZED JOINTS <br /> M310 METALLIC PIPING, GENERAL <br /> Soldered, brazed, and braze welded joints shall not <br /> Paragraph 310 applies in its entirety be used. <br /> M311 WELDED JOINTS IN METALLIC PIPING M318 SPECIAL JOINTS IN METALLIC PIPING <br /> Welded joints may be made in any metal for which it Paragraph 318 applies,with the exception that adhe- <br /> is possible to qualify welding procedures,welders,and sive joints and bell type joints shall not be used. <br /> welding operators in accordance with para. M328. <br /> M311.1 General PART 5 <br /> Paragraph 311.1 applies with the following exceptions: FLEXIBILITY AND SUPPORT OF METALLIC PIPING <br /> (a) Split backing rings shall not be used. M319 FLEXIBILITY OF METALLIC PIPING <br /> (b) Socket welded joints greater than DN 50 (NPS 2) <br /> are not permitted. Paragraph 319 applies, with the exception that the <br /> (c) Examination shall be in accordance with simplified rules in para. 319.4.1(c) do not apply. <br /> para. M341.4. <br /> M311.2 Specific Requirements M320 ANALYSIS OF SUSTAINED LOADS <br /> Paragraphs 311.2.4(a); 311.2.5(a), (b),and (d); 311.2.6; Paragraph 320 applies. <br /> and 311.2.7 apply. <br /> M321 PIPING SUPPORT <br /> M312 FLANGED JOINTS IN METALLIC PIPING Paragraph 321 applies, except that supporting ele- <br /> Paragraph 312 applies in its entirety. ments welded to the piping shall be of listed material. <br /> M313 EXPANDED JOINTS IN METALLIC PIPING PART 6 <br /> SYSTEMS <br /> Expanded joints shall not be used. <br /> M322 SPECIFIC PIPING SYSTEMS <br /> M314 THREADED JOINTS IN METALLIC PIPING M322.3 Instrument Piping <br /> M314.1 General Paragraph 322.3 applies, with the exception that for <br /> signal tubing in contact with process fluids and process <br /> Paragraphs 314.1(a), (b), and (c) apply. temperature—pressure conditions <br /> M314.2 Specific Requirements (a) tubing shall be not larger than 16 mm(5/8 in.)O.D. <br /> and shall be suitable for the service <br /> M314.2.1 Taper-Threaded Joints. Paragraph 314.2.1 (b) an accessible block valve shall be provided to iso- <br /> applies except that only components suitable for Normal late the tubing from the pipeline <br /> Fluid Service in sizes 8 <— DN <— 25 (% <— NPS <— 1) are <br /> permitted (see Table 314.2.1). Sizes smaller than DN 20 (c) joining methods shall conform to the requirements <br /> of para. M315 <br /> (NPS 3/4) shall be safeguarded (see Appendix G). <br /> M314.2.2 Straight-Threaded Joints. Paragraph M322.6 Pressure-Relieving Systems <br /> 314.2.2 applies.In addition,components shall have ade- Paragraph 322.6 applies, except for para. 322.6.3. See <br /> quate mechanical strength and the joint shall have a para. M322.6.3. <br />