Proposal to remove the provisions for welded constructions of compressed natural gas (CNG) cylinders or metal liners, including high-strength steel CNG cylinders.

Pursuant to the proposal to enable the use of autonomous compressed natural gas (CNG) heaters for the purpose of heating the engine coolant under UN R110, this proposal would require that the alarm system and fire suppression system (required through paragraph 7.5.1.5. as amended by Supplement 4 to 06 series of amendments) be activated as soon as the heater is in function and even if the engine is not operational.

Proposal to enable the use of autonomous CNG heaters for the heating of engines before the vehicle is in service.