Safe Handling of Tank Containers - ITCO

ICHCA International Safety Panel Briefing Pamphlet No 30
A2.2.13Maximum Degrees of Filling – Worked Example
Paragraphs A2.2.3, A2.2.4 and A2.2.8 cover three situations for differing
substances:
maximum filling of lesser danger liquid substances loaded at ambient
temperatures
maximum filling of greater danger liquid substances or with a higher
vapour pressure
maximum filling of molten dangerous substances (carried above their
melting point temperature)
Example1: The substance ACRYLONITRILE, STABLIZED, Class 3,
Subsidiary Hazard 6.1, Packing Group I, UN 1093 is to be
shipped in tank containers. A shipper wishes to ship 22,500 kg.
The largest suitable tank container available has a capacity of
26,000 litres. Can this consignment be accepted? The substance
has a liquid density at the filling temperatures:
of 0.812 at 15 º C (filling temperature); and
of 0.772 at 50ºC (highest possible temperature).
Step 1 Determine the volume represented by 22,500 kilos of the
substance at the filling temperature:
Cargo Net Mass
Liquid Density
22,500 kg
0.812
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1 + α(tr - tf)
= Volume (litres)
= 27,709 litres
Conclusion: A 26,000 litre tank container is too small for the shipper’s
preferred consignment. The shipper must be informed as to the
maximum permitted quantity that can be loaded in this tank
container.
Step 2 From the Dangerous Goods List (column 14 – Portable tank
provisions) UN 1093 this substance require TP2 and TP13
provisions to be applied
IMDG Code paragraph 4.2.5.3 indicates that TP13 requires self
contained breathing apparatus shall be provides when this
substance is transported (see Table A5.2), and TP2 directs th
reader to 4.2.1.9.3 of the Code (see A2.2.4).
Degree of filling =