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ASME B31.3-2016 A306.1.2 Unlisted Fittings. Unlisted fittings maybe A308.2 Nonmetallic Flanges used only in accordance with para. A302.2.3. A308.2.1 General A306.2 Pipe Bends (a) Flanges shall be adequate, with suitable facing, A306.2.1 General. Abend made in accordance with gasketing,and bolting,to develop the full rating of the para. A332 and verified for pressure design in accor- joint and to withstand expected external loadings. dance with para.A304.2.1 shall be suitable for the same (b) The designer should consult the manufacturer for service as the pipe from which it is made. ratings of flanges. A306.2.2 Corrugated and Other Bends. Bends of A308.2.2 Threaded Flanges. Threaded flanges are other designs (such as creased or corrugated) shall be subject to the requirements for threaded joints in qualified for pressure design as required by para. A314. para. A304.7.2. A308.3 Flange Facings A306.3 Miter Bends Paragraph 308.3 applies in its entirety. Except as specified in para. 306.3.2,a miter bend that conforms to para.A304.2.3 may be used in Normal Fluid A308.4 Limitations on Gaskets Service. See also Appendix F,para. F308.4. A306.4 Fabricated or Flared Laps A308.4.1 Lining Used as Facing or Gasket. Lining The following requirements do not apply to fittings material extended over the flange face and used as a conforming to para. A306.1. gasket shall conform to para. 308.4. A306.4.1 Fabricated Laps (a) The requirements in paras.306.4.1(a)and (b)shall A309 BOLTING be met. (b) Lap material shall be suitable for the service condi- Bolting includes bolts, bolt studs, studs, cap screws, tions. Pressure design shall be qualified as required by nuts, and washers. See Appendix F,para. F309. para. A304.7.2. A306.4.2 Flared Laps. Flared laps shall not be used A309.1 General in nonmetallic piping. Paragraph 309.1 applies in its entirety. A306.5 Fabricated Branch Connections A309.2 Specific Bolting The following requirements do not apply to fittings Any bolting that meets the requirements of para.309.1 conforming to para. A306.1. may be used with any combination of flange materials A306.5.1 General. A fabricated branch connection and flange facings. Joint assembly shall conform to the made by bonding the branch pipe directly to the header requirements of para. A335.2. pipe,with or without added reinforcement as stated in para.328.5.4,and shown in Fig. 328.5.4,may be used in A309.3 Tapped Holes in Nonmetallic Components Normal Fluid Service,provided that pressure design is Tapped holes for pressure-retaining bolting in piping qualified as required by para. A304.7.2. components may be used provided pressure design is A306.5.2 Specific Requirements. Fabricated branch qualified as required by para. A304.7.2. connections shall be made as specified in para. A328.5. PART 4 A307 VALVES AND SPECIALTY COMPONENTS FLUID SERVICE REQUIREMENTS FOR PIPING JOINTS Paragraph 307 applies in its entirety, except that in A310 GENERAL para. 307.1.2 reference to paras. A302.2.3 and A304.7.2 replaces reference to paras. 302.2.3 and 304.7.2, Paragraph 310 applies in its entirety. respectively. A308 FLANGES, BLANKS, FLANGE FACINGS, AND A311 BONDED JOINTS IN PLASTICS GASKETS A311.1 General A308.1 General Bonding shall be in accordance with para. A328 and Paragraph 308.1 applies, except that in para. 308.1.2 examination shall be in accordance with para. A341.4.1 reference to para. A302.2.3 replaces reference to for use in Normal Fluid Service,subject to the limitations para. 302.2.3. of the material.