joseph h
1. At one time Ford Motor Company (a very safety oriented company) required an ASME LPG tank (fixed mounted) in their ZA-1, 300A lift truck specifications for LPG powered equipment and later revised the specification to the ICC (removable) tank type.

2. My understanding on LPG regulations is that specific states, counties or cities can impose specific regulations that are more stringent than national requirements, i.e. OSHA, NFPA, etc., as long as the local requirements do not conflict with the national or fed standards. It is always advisable for users to check with their local code enforcement agency.

Away from LPG, but an example of local codes, in Gwinnett County Georgia, local codes require all storage racks to be seismic compliant i.e. meet the same standards as required in California. Rumor has it, the county safety commissioner came from the Shaky Side.