These requirements cover hose in sizes up to and including a nominal internal diameter of 4 in (102 mm) for conducting liquefied petroleum gas intended to be installed in closed systems in compliance with the Standard of the National Fire Protection Association for the Storage and Handling of Liquefied Petroleum Gases, NFPA 58. The hose is made for a maximum working pressure of 350 pounds per square inch gauge (psig) (2400 kPa). Hose in sizes larger than 2 in (50.8 mm) is not intended for use on reels. Hoses covered by this standard are intended for use at temperatures within the range of minus 40 ?C (minus 40 ?F) to plus 60 ?C (140 ?F), or minus 54 ?C (minus 65 ?F) to plus 60 ?C. This standard does not apply to: a) Couplings nor their method of attachment; b) Gas appliance connectors for handling fuel gases at 5 psig (34.5 kPa) or less, nor to metallic hose intended for use in oil transportation piping, in petroleum refinery piping, or in gas transmission and distribution piping systems; or c) Hose intended for use in automotive applications or hose intended for use in confined areas. Hose for use in automotive applications is investigated under the Outline of Investigation for LP-Gas Fuel Hose and Hose Assemblies for Vehicle Engines, Subject 1785.