(Please advise whether there is a filling ratio specified for UN drums and jerricans.)

Q.
Packing instructions show the maximum weight (kilograms) or the maximum volume (litres) for drums and jerricans. Is there a specific filling ratio tht we must observe? For instance, can we put 5L into a UN 5L jerrican, or should we leave some ullage? (31 Dec 13)

A.
As stated in DGR 5.0.2.8 Ullage, sufficient ullage must be considered in filling a drum or a jerrican with liquids. Pressure at sea level and the pressure experienced in the cargo hold of an aircraft at cruising altitude would show a pressure differential of about 25kPa. It would theoretically mean that a 25% ullage would be desirable.

Needless to state, for air transportation, it is a prerequisite that the packaging material must be of such strength that it would endure a pressure differential of 95kPa. As stated in DGR 5.0.1.2 (c), the contents of the inner packagings must not exceed the inner packaging limits of the Packing Instructions shown in columns G, I and K of the List of Dangerous Goods. The quantity inside the packagings must not exceed the design limit of the packaging itself.


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