UL SUBJECT 1337

Abstract

Scope: These requirements cover the following types of devices for engine fuel system applications intended for use with liquefied petroleum gas (LP-Gas), natural gas, and/or manufactured gas. a) Automatic shutoff valves – electrically operated or vacuum actuated (mechanical); b) Combination Manual/Automatic Shutoff Valves – electrically operated or vacuum actuated (mechanical); c) Carburetors or Air-Fuel Mixers; d) Regulators; e) Vaporizers and Vaporizer/Regulators; f) Filters and strainers; g) Fuel locks and fuel-lock filters; h) Fittings and connectors; i) Quick connect couplings and quick closing couplings; j) Liquid level gauges; k) Liquid level control valves (also known as overfilling prevention devices); l) Relief devices; and m) Fuel control valves. Devices covered by these requirements are for use in engine fuel systems and engine fuel systems in facilities covered in the Liquefied Petroleum Gas Code, NFPA 58, Vehicular Fuel Systems Code, NFPA 52, and/or Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines, NFPA 37. Devices covered by this standard are intended to be installed and used on board the vehicle (automobile, fork-lift, etc.) or engine generators that they are intended for use with. This outline does not cover these devices for general use. Except for such observations as are required to ascertain performance characteristics, the assigning of flow capacity ratings are not within the scope of these requirements. These requirements do not cover products for use in hazardous (Classified) locations.