UL 109:2018 pdf download.Tube Fittings for Flammable and Combustible Fluids，Refrigeration Service, and Marine Use.
4 General
4.1 Tube fittings shall be of the flare, inverted flare, threaded-and-ball-sleeve compression, and other types for use with copper, brass, aluminum, and steel tubing.
4.2 Tube fittings shall be designed and constructed to be equivalent in mechanical strength, provisions
for assembly and disassembly, and resistance to corrosion to tube fittings conforming to the Standard for
Automotive Tube Fittings, SAE J512; Cast Copper Alloy Fittings for Flared Copper Tubes, ANSI/ASME
B16.26; or the Standard for Refngeration Tube Fittings — General Specilicahons, SAE J513.
4.3 The design of the fitting shall be such as to minimize the risk of incorrect assembly, such as reversal of components
5 Materials
5.1 The various parts of a tube fitting shall be formed using materials having the strength and resistance to corrosion associated with the Intended use or as designated in the appropriate Standard. Such materials include brass, bronze, stainless steel, or plated carbon steel In the form of bar stock or cast, forged, or extruded.
5.2 A Marine-Use fitting and component part shall have less than 38 percent zinc content or indude inhibitors to attain equivalent resistance to dezincilicabon. Metals shall be machined, forged, or extruded and shall be designed for use in salt atmosphere and shall not be affected significantly by submersion in salt bilge water.
5.2 revised July 19, 2000
5.3 FIttings for gas and refrigeration Service shall be machined, forged, or extruded.
5.4 With reference to 5.2 and 5.3, the fitting shall be capable of withstanding, without cracking, the
1 0-Day Moist Ammonia Air Stress Cracking Test, Section 11. for copper and copper alloys.
5.4 revIsed JLNie 19. 1997
5.5 Carbon steel shall have a protective coating equivalent to that afforded by a cadmium or zinc plating 0.0002 inch (0.005 mm) m thickness plus a cliromate treatment or phosphate coating.
5.6 Carbon steel and stainless steel Marine-Use fittings for use with seamless steel tubrng in diesel engine fuel systems shall be resistant to corrosion in salt atmosphere. Stainless steel fittings shall have corrosion resistance equivalent to that of stainless steel No. 304.
4.1 Tube fittings shall be of the flare, inverted flare, threaded-and-ball-sleeve compression, and other types for use with copper, brass, aluminum, and steel tubing.
4.2 Tube fittings shall be designed and constructed to be equivalent in mechanical strength, provisions
for assembly and disassembly, and resistance to corrosion to tube fittings conforming to the Standard for
Automotive Tube Fittings, SAE J512; Cast Copper Alloy Fittings for Flared Copper Tubes, ANSI/ASME
B16.26; or the Standard for Refngeration Tube Fittings — General Specilicahons, SAE J513.
4.3 The design of the fitting shall be such as to minimize the risk of incorrect assembly, such as reversal of components
5 Materials
5.1 The various parts of a tube fitting shall be formed using materials having the strength and resistance to corrosion associated with the Intended use or as designated in the appropriate Standard. Such materials include brass, bronze, stainless steel, or plated carbon steel In the form of bar stock or cast, forged, or extruded.
5.2 A Marine-Use fitting and component part shall have less than 38 percent zinc content or indude inhibitors to attain equivalent resistance to dezincilicabon. Metals shall be machined, forged, or extruded and shall be designed for use in salt atmosphere and shall not be affected significantly by submersion in salt bilge water.
5.2 revised July 19, 2000
5.3 FIttings for gas and refrigeration Service shall be machined, forged, or extruded.
5.4 With reference to 5.2 and 5.3, the fitting shall be capable of withstanding, without cracking, the
1 0-Day Moist Ammonia Air Stress Cracking Test, Section 11. for copper and copper alloys.
5.4 revIsed JLNie 19. 1997
5.5 Carbon steel shall have a protective coating equivalent to that afforded by a cadmium or zinc plating 0.0002 inch (0.005 mm) m thickness plus a cliromate treatment or phosphate coating.
5.6 Carbon steel and stainless steel Marine-Use fittings for use with seamless steel tubrng in diesel engine fuel systems shall be resistant to corrosion in salt atmosphere. Stainless steel fittings shall have corrosion resistance equivalent to that of stainless steel No. 304.
