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Pigtails and Flexible Hose Connectors for LP-Gas
UL 569
1 Scope
1.1 These requirements cover pigtails and flexible hose connectors used in the assembly of fuel-supply systems other than those outlined in 1.3(b) and (c), intended for liquefied petroleum gas (LP-Gas). Low or high pressure flexible hose connectors are also suitable for low pressure (1.0 psig (6.9 kPa) or less) natural gas service. LP-Gas systems use either Department of Transportation (DOT) cylinders or ASME tanks and are intended to be installed in accordance with the Liquified Petroleum Gas Code, NFPA/ANSI 58. Low pressure flexible hose connectors used in natural gas systems are intended to be installed in accordance with the National Fuel Gas Code, NFPA 54/ANSI Z223.1. Pigtails and flexible hose connectors are used to make connection between parts of equipment or between equipment and service piping.

1.2 These requirements also cover hose without end-connection fittings that is used to manufacture flexible hose connectors.

1.3 This Standard does not apply to:

• Gas appliance connectors for handling fuel gases at 5 psig (34.5 kPa) or less which are investigated under the Standard for Metal Connectors for Gas Appliances, ANSI Z21.24.
• Flexible hose connectors for engine fuel applications which are investigated under the Outline of Investigation, LP-Gas Fuel Hose and Hose Assemblies for Vehicle Engines, UL 1785.
• Flexible hose connectors for use in confined areas.
• Hose connectors which are investigated under the Standard for Gas Hose Connectors for Portable Outdoor Gas-Fired Appliances, ANSI Z21.54.