UL 109-2020 pdf free download.Tube Fittings for Flammable and Combustible Fluids, Refrigeration Service, and Marine Use.
5.2 A Marine-Use fitting and component part shall have less than 38 percent zinc content or include inhibitors to attain equivalent resistance to dezinclflcation. 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.
5.3 Fillings 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 Moist
Ammonia Air Stress Cracking Test, Section 11, for copper and copper alloys.
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) in thickness plus a chromate treatment or phosphate coating.
5.6 Carbon steel and stainless steel Marine-Use fittings for use with seamless steel tubing 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.
5.7 The composition of metal alloys used for the fabrication of Marine-Use fittings shall be of known characteristics for normal corrosion resistance, dezincification resistance, and galvanic compatibility with other parts of the fuel system. The material shall be tested, when required, by a salt water atmosphere exposure test. The test is to be conducted for 500 hours.
5.8 Fittings shall be fabricated of a material having a melting point (solidus temperature) not less than
950°F (510°C).
5.9 Brazing material if used, shall have a melting point (solidus temperature) in excess of 1000 F
(537°C).
Exception: Marine use fittings if soldered, shall be soldered or brazed with a material having a melting point exceeding 840°F (450° C), in accordance with the Standard for Pleasure and Commercial Motor Craft, NFPA 302.
PERFORMANCE
6 General
6.1 Representative samples of each fitting and related adaptor design shall be subjected to the tests described in this Standard.
6.2 Samples for the Pull Test, Section 7, and the vibration tests, Sections 8 and 9, are to be of the straight connector type, with one end threaded for pipe connection. Samples for the pull test are to be for female pipe connection in all cases.UL 109 pdf download.