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ASME B31.3-2016 of reinforcement shall be qualified as required by A304.7 Pressure Design of Other Components para. A304.7.2 except as provided in para. A304.3.2. A304.7.1 Listed Components. Other pressure con- A304.3.2 Branch Connections Using Fittings. It may taining components, manufactured in accordance with be assumed without calculation that a branch connection standards in Table A326.1 but not covered elsewhere in has adequate strength to sustain the internal and exter- para. A304, may be utilized in accordance with nal pressure that will be applied to it if it utilizes a fitting para. A303. (a tee,lateral, or cross) in accordance with para. A303. A304.7.2 Unlisted Components. Pressure design of A304.3.3 Additional Design Considerations. The unlisted components and joints,to which the rules else- requirements of paras. A304.3.1 and A304.3.2 are where in para. A304 do not apply, shall be based on intended to assure satisfactory performance of a branch calculations consistent with the design criteria of this connection subjected only to internal or external pres- Code.Calculations shall be substantiated by one or both sure. The designer shall also consider paras. 304.3.5(a), of the means stated in (a) and (b) below, considering (c), and (d). applicable ambient and dynamic effects in paras. 301.4 through 301.11. A304.4 Closures (a) extensive, successful service experience under Closures not in accordance with para. A303 shall be comparable design conditions with similarly propor- qualified as required by para. A304.7.2. tioned components made of the same or like material (b) performance test under design conditions includ- A304.5 Pressure Design of Nonmetallic Flanges ing applicable dynamic and creep effects,continued for a time period sufficient to determine the acceptability (16) A304.5.1 General of the component or joint for its design life (a) Flanges not in accordance with para. A303, or For (a) or (b) above, the designer may interpolate A304.5.1(b) or (d) shall be qualified as required by between sizes, wall thicknesses, and pressure classes, para. A304.7.2. and may determine analogies among related materials. (b) Flanges for use with flat ring gaskets may be A304.7.3 Nonmetallic Components With Metallic designed in accordance with the BPV Code,Section VIII, Pressure Parts. Components not covered by standards Division 1, Appendix 2, except that the allowable in Table A326.1,in which both nonmetallic and metallic stresses and temperature limits of this Code shall gov- ern.Nomenclature shall be as defined in the BPV Code, parts contain the pressure,shall be evaluated by applica- ble requirements of para. 304.7.2 as well as those of except for the following: P = design gage pressure para. A304.7.2. SQ = bolt design stress at atmospheric temperature Sb = bolt design stress at design temperature PART 3 Sf = allowable stress for flange material from FLUID SERVICE REQUIREMENTS FOR PIPING Table B-1, B-2, or B-3 COMPONENTS (c) The rules in (b) above are not applicable to a A305 PIPE flanged joint having a gasket that extends outside the Listed pipe may be used in Normal Fluid Service, bolts (usually to the outside diameter of the flange). subject to the limitations of the pressure-containing (d) For flanges that make solid contact outside the material and para. A323.4. Unlisted pipe may be used bolts, Section VIII, Division 1, Appendix Y should be only in accordance with para. A302.2.3. used. A304.5.2 Blind Flanges. Blind flanges not in accor- A306 FITTINGS, BENDS, MITERS, LAPS, AND dance with para. A303 may be designed in accordance BRANCH CONNECTIONS with para. 304.5.2, except that allowable stress S shall be taken from Tables in Appendix B. Otherwise, they General. Fittings,bends,miters,laps,and branch con- shall be qualified as required by para. A304.7.2. nections may be used in accordance with paras. A306.1 through A306.5. Pipe and other materials used in such A304.6 Reducers components shall be suitable for the manufacturing pro- Reducers not in accordance with para. A303 shall be cess and the fluid service. qualified as required by para. A304.7.2. A306.1 Pipe Fittings A306.1.1 Listed Fittings. Listed fittings maybe used 4 Bolt design stresses shall not exceed those in Table A-2 or in Normal Fluid Service subject to limitations on Table A-2M. materials.