These requirements cover refillable liquefied petroleum gas (LP-Gas) cylinder assemblies employing U.S. Department of Transportation (DOT) type cylinders made from steel@ aluminum@ or composite materials. Steel or aluminum cylinders will have a water capacity greater than 2.2 pounds (1 kg)@ equivalent to nominal 1-pound (0.5-kg) LP-Gas but not greater than 1000 pound (454.5 kg) water capacity@ which is equivalent to 420 pound (191 kg) propane capacity. Seamless Composite Cylinders have a size limitation of 105 pounds (48 kg) water capacity@ which is equivalent to 45 pounds (20 kg) propane capacity. Cylinder assemblies covered by these requirements are intended for use@ installation and storage in propane systems such as@ but not limited to@ applications covered by the following standards: a) Liquefied Petroleum Gas Code@ NFPA 58@ except as noted in 1.4. b) Outdoor Cooking Gas Appliances@ ANSI Z21.58/CSA 1.6. c) Recreational Vehicles@ NFPA 1192. d) Safety Standard for Low Lift and High Lift Trucks@ ASME B56.1. These cylinder assemblies are intended for use in consumer@ commercial@ and industrial applications to provide fuel for portable@ stationary@ or engine fuel equipment for such purposes as@ but not limited to@ camping@ cooking@ heating@ lighting@ soldering@ brazing@ industrial truck@ or cleaning machine service@ etc. They may be filled at a location other than the point of use and be connected to utilization equipment by the user. These requirements do not cover ASME type container assemblies covered under the Standard for Container Assemblies for LP-Gas@ UL 644@ ASME containers for industrial truck LP-Gas fuel service and containers permanently mounted on vehicles. Seamless Composite Cylinders with a CGA 793 outlet connection are intended only to be for emergency temporary indoor heating in attended use