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ASME B31.3-2016 A335 ASSEMBLY AND ERECTION the end of the tubing shall be cut perpendicular to the A335.1 Alignment tube centerline,preferably with a tubing cutter specially made for thermoplastic tubing.No cuts,scratches,dirt, Paragraph 335.1 applies in its entirety. or surface damage to either inside or outside diameter A335.2 Flanged and Mechanical Joints are permitted on the pipe end to be flared. Paragraph 335.2 applies in its entirety. A335.4.2 Flareless and Compression Tubing Joints. Paragraph 335.4.2 applies. (16) A335.2.5 Nonmetallic Bolted Joints (a) Bolted joints in nonmetallic piping may be assem- bled with any combination of flange material and flange Paragraph 335.5 applies. facings,except that the following apply when other than A335.6 Special Joints flat face flanges and full face gaskets are used: (1) consideration shall be given to the strength of Paragraph 335.6 applies, except that expanded joints the flanges,and to sustained loads,displacement strains, are not permitted. and occasional loads described in paras. A302.3.3 and A335.6.3 Flexible Elastomeric Sealed Joints. Assem- A302.3.4 bly of flexible elastomeric sealed joints shall be in accor- (2) an appropriate bolt-up sequence shall be dance with the manufacturer's recommendations and specified the following: (b) Appropriate limits shall be specified for bolt-up (a) Seal and bearing surfaces shall be free from injuri- torque, and those limits shall not be exceeded. ous imperfections. (c) Flat washers shall be used under bolt heads and (b) Any lubricant used to facilitate joint assembly nuts. shall be compatible with the joint components and the A335.2.6 Metallic Piping Lined With Nonmetals. In intended service. assembling mechanical joints in metallic piping lined (c) Proper joint clearances and piping restraints(if not with nonmetals, consideration shall be given to means integral in the joint design)shall be provided to prevent for maintaining electrical continuity between pipe sec- joint separation when expansion can occur due to ther- tions,where static sparking could cause ignition of flam- mal and/or pressure effects. mable vapors. See Appendix F, para. FA323.4(a). A335.8 Assembly of Brittle Piping A335.3 Threaded Joints A335.8.1 General. Care shall be used to avoid Paragraph 335.3 applies except for para. 335.3.2. See scratching of brittle nonmetallic piping in handling and para. A335.3.2. supporting.Any scratched or chipped components shall be replaced. Care shall be used in handling glass-lined A335.3.2 Joints for Seal Bonding. A threaded joint and cement-lined metal pipe because the lining can be to be seal bonded shall be made up without thread injured or broken by blows that do not dent or break compound. A joint containing thread compound that the pipe. leaks during leak testing may be seal bonded in accor- dance with para. A328.6, provided all compound is A335.8.2 Borosilicate Glass Piping. In addition to the precaution in para. A335.8.1,borosilicate glass pip- removed from exposed threads. ing components shall be protected from weld spatter. A335.3.4 Tools, Nonmetallic Piping. Either strap Any component so damaged shall be replaced. Flanges wrenches or other full circumference wrenches shall be and cushion inserts shall be carefully fitted and aligned used to tighten threaded pipe joints. Tools and other to pipe,fittings,and valve ends. Gaskets shall be of the devices used to hold or apply forces to the pipe shall construction recommended for the joint.Installation and be such that the pipe surface is not scored or deeply torquing of bolts shall be in accordance with the manu- scratched. facturer's recommendations. A335.3.5 RTR and RPM Piping. In assembling A335.9 Cleaning of Piping threaded joints in RTR and RPM piping,where threads may be exposed to fluids that can attack the reinforcing See Appendix F,para. F335.9. material, threads shall be coated with sufficient resin to cover the threads and completely fill the clearance between the pipe and the fitting. PART 10 A335.4 Tubing Joints INSPECTION, EXAMINATION, AND TESTING A335.4.1 Flared Joints in Thermoplastic Tubing. In A340 INSPECTION addition to preparation in accordance with para.335.4.1, Paragraph 340 applies in its entirety.