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ASME B31.3-2016 K314.3.2 Other Straight-Threaded Joints K316 CAULKED JOINTS (a) Other Joints Using Components Conforming to Listed Caulked joints are not permitted. Standards. Joints made up using straight-threaded fit- tings covered by standards listed in Table K326.1 may be used,provided the fittings and joints are suitable for K317 SOLDERED AND BRAZED JOINTS the pipe with which they are to be used (considering K317.1 Soldered Joints piping tolerances and other characteristics), are used Soldered joints are not permitted. within the pressure—temperature limitations of the fit- ting, and comply with para. K302.2.1. K317.2 Brazed Joints (b) Other Joints Using Components Not Conforming to (a) Braze welded joints and fillet joints made with Listed Standards. Other straight-threaded joints (e.g., a brazing filler metal are not permitted. union comprising external and internal ends joined with (b) Brazed joints shall be made in accordance with a threaded union nut,or other constructions shown typi- para. K333 and shall be qualified as required by cally in Fig. 335.3.3) may be used. Such joints shall be para.K304.7.2.Such application is the owner's responsi- qualified by performance testing in accordance with bility.The melting point of brazing alloys shall be consid- para. K304.7.2(b). Testing shall be conducted for each ered when exposure to fire is possible. material type/grade and heat treatment condition,com- ponent configuration (e.g.,elbow),size (e.g.,NPS),and K318 SPECIAL JOINTS pressure rating. Performance testing of joints in which the process of making up the joint involves significant Special joints include coupling,mechanical,and gland uncontrolled loads (e.g., hammer unions) shall include nut and collar types of joints. testing designed to simulate actual loads. K318.1 General Joints may be used in accordance with para.318.2 and K315 TUBING JOINTS the requirements for materials and components in this Chapter. K315.1 Flared Type Joints Joints of the flared type are not permitted. K318.2 Specific Requirements K318.2.1 Prototype Tests. A prototype joint shall K315.2 Flareless Joints Using Components have been subjected to performance tests in accordance Conforming to Listed Standards with para.K304.7.2(b)to determine the safety of the joint Joints made up using flareless type fittings covered under test conditions simulating all expected service by listed standards in Table K326.1 may be used, pro- conditions. Testing shall include cyclic simulation. vided that the fittings K318.2.2 Prohibited Joints. Bell type and adhesive (a) do not rely on friction to carry loads from the joints are not permitted. tubing to the fitting (b) are suitable for the tubing or pipe with which they PART 5 are to be used (considering piping tolerances and other FLEXIBILITY AND SUPPORT characteristics) K319 FLEXIBILITY (16) (c) are used within the pressure—temperature limita- tions of the fitting and the joint Flexibility analysis shall be performed for each piping (d) comply with para. K302.2.1 system. Paragraphs 319.1 through 319.7 apply, except for para. 319.4.1(c). The computed displacement stress K315.3 Flareless Joints Using Components Not range shall be within the allowable displacement stress Conforming to Listed Standards range in para.K302.3.5 and shall also be included in the fatigue analysis in accordance with para. K304.8. Joints made up using flareless type fittings not listed in Table K326.1 may be used,provided that the type of K321 PIPING SUPPORT fitting selected is adequate for the design pressure,other loadings,and the design temperature,and does not rely Piping supports and methods of attachment shall be on friction to restrain the axial load. The design shall in accordance with para. 321 except as modified below, also be qualified by performance testing in accordance and shall be detailed in the engineering design. with para. K304.7.2(b). Testing shall be conducted for K321.1 General each material type/grade and heat treatment condition, component configuration (e.g.,elbow),size (e.g.,NPS), K321.1.1 Objectives. Paragraph 321.1.1 applies,but and pressure rating. substitute "Chapter" for "Code" in (a).