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ASME B31.3-2016 A311.2 Specific Requirements factory cut or molded in the bottom portions of fittings A311.2.1 Fillet Bonds. A fillet bond may be used with deep sockets. only in conjunction with a qualified hot gas welding (d) Factory cut or molded threaded nipples, cou- procedure for bonding (see para. A328.5.2). plings, or adapters,bonded to plain-end RTR pipe and fittings, may be used where it is necessary to provide A311.2.2 Seal Bonds. A seal bond may be used connections to threaded metallic piping. only to prevent leakage of a threaded joint and only if it has been demonstrated that there will be no deleterious A314.2.3 Reinforced Plastic Mortar Piping. effect on the materials bonded. Threaded joints are not permitted in reinforced plastic A311.2.3 Joints Limited to Category D Fluid Service. mortar (RPM) piping. Joints that have been examined in accordance with para. 341.4.2 may be used only for Category D Fluid A315 TUBING JOINTS Service. Paragraph 315 applies in its entirety,subject to material A312 FLANGED JOINTS limitations,exclusion of 315.2(b)regarding severe cyclic conditions,and replacement of reference to Table 326.1 The designer should consult the manufacturer for rat- and para. 304.7.2 with reference to Table A326.1 and ings of flanged joints in nonmetallic piping and in piping para. A304.7.2,respectively lined with nonmetals. A313 EXPANDED JOINTS A316 CAULKED JOINTS Paragraph 313 applies in its entirety. Paragraph 316 applies in its entirety. A314 THREADED JOINTS A318 SPECIAL JOINTS A314.1 General Special joints are those not covered elsewhere in A threaded joint is suitable for use in Normal Fluid Chapter VII,Part 4,such as bell type and packed gland Service, subject to the limitations of the material and type joints. requirements elsewhere in para.A314.A joint conform- ing to para. 314.1(d) shall not be used. A318.1 General A314.2 Specific Requirements Paragraph 318.1 applies in its entirety,except that,in A314.2.1 Thermoplastic Piping para. 318.1.2,reference to para. A304.7.2 replaces refer- (a) Polyethylene (PE) pipe and tubing shall not be ence to para. 304.7.2. joined by threaded joints. A318.2 Specific Requirements (b) Threaded joints in other thermoplastic piping shall conform to all of the following: Paragraph 318.2 applies with the exception of (1) The pipe wall shall be at least as thick as para. 318.2.3. Schedule 80 as defined in ASTM D1785. (2) Threads shall be NPT, and shall conform to A318.3 Piping Lined With Nonmetals ASME 131.20.1 or ASTM F1498. A318.3.1 Welding of Metallic Piping (3) Threads shall conform to applicable standards in Table A326.1. (a) General. Joints made in accordance with the rules (4) A suitable thread sealant shall be used. in para. A329.1 may be used in Normal Fluid Service, subject to material limitations. A314.2.2 Reinforced Thermosetting Resin Piping. (b) Specific Requirements. Welds shall be limited to Threaded joints in reinforced thermosetting resin(RTR) those that do not affect the serviceability of the lining. piping shall conform to the following: (a) External threads shall be factory cut or molded on A318.3.2 Flared Linings special thick-walled pipe ends. (a) General. Flared ends of linings made in accordance (b) Matching internal threads shall be factory cut or with the rules in para. A329.2 may be used in Normal molded in the fittings. Fluid Service, subject to material limitations. (c) Threading of plain ends of RTR pipe is not permit- (b) Specific Requirements. Flaring shall be limited to ted, except where such threads are limited to the func- applications that do not affect the serviceability of the tion of a mechanical lock to matching internal threads lining.