Non-refillable gas cylinders that are fitted with burst discs, such as those shown in Figure 1, may not be used for flammable and toxic gases if they are more than 1.25 L water capacity. This is a requirement of:
- International Maritime Dangerous Goods Code (IMDG Code) covering the transport of dangerous goods by sea; and
- section 4.1.6.1.9 of the Australian Code for the Transport of Dangerous Goods by Road and Rail, 7th Edition (ADG7).
Some refrigerant vendors have imported flammable refrigerants in these cylinders, and a number have been sold to vehicle-servicing workshops and refrigeration mechanics across Australia. It is illegal for vendors to transport or supply flammable refrigerants in these cylinders.