UL 330-2021 pdf download – Hose and Hose Assemblies for Dispensing Flammable and Combustible Liquids.
8.4 A protective coating shall provide resistance against corrosion to a degree not less than that provided by the protective coatings specified in 8.5. 8.5 Cadmium plating shall have a thickness of not less than 0.0003 in (0.008 mm) and zinc plating shall have a thickness of not less than 0.0005 in (0.013 mm), except on parts where threads constitute the major portion of the area, in which case the thickness of the cadmium or the zinc plating shall not be less than 0.00015 in (0.0038 mm). 8.6 The coupling provided on single-line hose assemblies shall have male pipe threads complying with the Standard for Pipe Threads, General Purpose (Inch), ANSI/ASME B1.20.1. 8.7 The couplings provided on coaxial vapor recovery hose assemblies shall have male 1-7/8 – 12 SAE straight threads when the inner hose is intended to dispense the liquid fuel into the vehicle and 1-1/4in – 18 SAE Straight, M34 by 1.5 metric thread or 1 in – 11-1/2 NPT threads, as required when the outer hose is intended to dispense the liquid fuel into the vehicle. All fittings shall be designed to fit the accessories connected to the hose couplings to form a leak tight connection. 8.8 When the threads of the couplings of a single-line hose assembly or vapor recovery hose assembly are not as specified in 8.6 or 8.7, the installation instructions which accompany each assembly shall indicate the specific equipment which can be connected to the fitting or shall be marked in accordance with 30.4. PERFORMANCE 9 General 9.1 The performance tests in this standard apply to hose and hose assemblies, unless the test indicates that it is applicable to hose assemblies only. 9.2 All pressure readings specified in this Standard are in gauge pressures. 10 Repeated Bending Test (Empty) 10.1 General 10.1.1 A sample shall withstand 3,000 cycles of repeated bending and shall then withstand the hydrostatic pressure as specified in the Hydrostatic Strength Test, Section 11.