4.1.6.4

a change of use of a refillable pressure receptacle shall include emptying, purging and evacuation

operations to the extent necessary for safe operation (see also table of standards at the end of this

section). in addition, a pressure receptacle that previously contained a class 8 corrosive substance or a

substance of another class with a corrosive subsidiary risk shall not be authorized for the carriage of a

class 2 substance unless the necessary inspection and testing as specified in 6.2.1.6 and 6.2.3.5

respectively have been performed.