TradeShowDave:
The National Fire Protection Association Preprint Draft for the 2011 edition of NFPA 58: Liquefied Petroleum Gas Code reads:
11.13.2 Industrial Truck Cylinders
11.13.2.1 Cylinders shall be designed, constructed, or fitted
for installation and filling in either the vertical or horizontal
position or, if of the universal type, in either position.
11.13.2.2 The cylinder shall be in the design position while
being filled or, if of the universal type, shall be filled in either
position.
The 2011 final edition can be viewed online (read only):
Google: NFPA 58: Liquefied Petroleum Gas Code
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