ANSI/CAN//UL/ULC 331B:2024

Scope 1.1 These requirements cover complete, self-contained strainer or filter assemblies intended for use with the fuels designated in 1.3. Although these devices are designated strainers, they may be either strainers or filters according to the common terminology of the industry. 1.2 Strainers or filter assemblies for diesel fuel, biodiesel fuel, diesel/biodiesel blends with nominal biodiesel concentrations up to 20 Percent (B20), kerosene, and fuel oil shall be constructed to comply with the following: a) The requirements defined in UL/ULC 331, Standard for Strainers for Flammable and Combustible Liquids, Anhydrous Ammonia and Non-potable Water; and b) The requirements in this Standard. 1.3 Strainers and filter assemblies covered by these requirements are intended for use with one or more of the following: a) Diesel fuel, which includes renewable diesel, and diesel/biodiesel blends with nominal biodiesel concentrations up to 5 percent (B0 – B5) formulated in accordance with the Standard Specification for Diesel Fuel Oils, ASTM D975; b) Diesel/biodiesel blends and renewable diesel/biodiesel blends with nominal biodiesel concentrations from 5 percent up to 20 percent (B6 – B20) formulated in accordance with the Standard Specification for Diesel Fuel Oil, Biodiesel Blends (B6 – B20), ASTM D7467; c) Biodiesel (B99.9/B100) formulated in accordance with the Standard Specification for Biodiesel Fuel Blend Stock (B100) for Middle Distillate Fuels, ASTM D6751; d) Kerosene formulated in accordance with the Standard Specification for Kerosine, ASTM D3699; e) Fuel oil (heating oil) formulated in accordance with the Standard Specification for Fuel Oils, ASTM D396. 1.4 These requirements do not cover the following: a) Strainers for handling liquids under cryogenic conditions; b) Strainers for marine use; c) Strainers for automotive fuel lines; d) Strainers for handling refrigerants; e) Strainers for use in such facilities as chemical, petrochemical, petroleum, and utility power plants; f) Strainers for use in fluid-power (hydraulic and pneumatic) applications; g) Strainers or filter assemblies for use with gasoline or gasoline/ethanol blends, which are covered under the Standard for Strainers for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations Up to 85 Percent (E0 – E85), UL/ULC 331A; h) Strainers or filter assemblies for use with LP-Gas, Natural Gas, Manufactured Gas, and Anhydrous Ammonia, which are covered under the Standard for Strainers for Flammable and Combustible Liquids, Anhydrous Ammonia and Non-potable Water, UL/ULC 331. 1.5 Products covered by this Standard are intended to be installed and used in accordance with the applicable Codes and Regulations as determined by the Authority Having Jurisdiction (AHJ), such as, but not limited to: a) In the United States: 1) Flammable and Combustible Liquids Code, NFPA 30; 2) Code for Motor Fuel Dispensing Facilities and Garages, NFPA 30A; or 3) Standard for the Installation of Oil-Burning Equipment, NFPA 31. b) In Canada: 1) National Fire Code of Canada; 2) Installation Code for Oil-Burning Equipment, CSA B139; 3) Oil-Burning Equipment: General Requirements, CSA B140; or 4) Provincial or other Regulations.