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ANSI/ITSDF B56.1-2009
SAFETY STANDARD FOR LOW LIFT AND HIGH LIFT TRUCKS

4.6 Fuel Handling and Storage

4.6.2 The storage and handling of liquefied petroleum gas fuel shall be in accordance with ANSI/NFPA 505 and ANSI/NFPA 58.
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OSHA, Powered Industrial Trucks, 1910.178(f)(2)

The storage and handling of liquefied petroleum gas fuel shall be in accordance with NFPA Storage and Handling of Liquefied Petroleum Gases (NFPA No. 58-1969), which is incorporated by reference as specified in Sec. 1910.6.

OSHA 1910.110, Storage and handling of liquefied petroleum gases.
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The ANSII/NFPA Standards are the Industry Standard. Your local LPG supplier should have copies of these codes.