Coffee Break Training: Inspection Techniques: Arrangement and Operation of LP-Gas Transfer Systems [open pdf - 475KB]
"The model fire codes rely in detail on the provisions of National Fire Protection Association (NFPA) 58, Liquefied Petroleum Gas Code, to establish operational safety requirements for bulk LP-Gas transfer facilities. Today's illustration identifies just a few of the safety requirements, including a fenced enclosure to prohibit public access to areas where LP-Gas is stored and transferred. (An enclosure is not required when and where necessary for the conduct of normal business activities.)"
Coffee Break Training - Fire Protection Series No. FP-2012-45
United States Fire Administration: http://www.usfa.fema.gov/