Hierarchy of tanks
Tanks with tank codes different from those indicated in this table or in Table A of Chapter 3.2 may also be used provided that any element (number or letter) of parts 1 to 4 of these tank codes correspond to a level of safety at least equivalent to the corresponding element of the tank code indicated in Table A of Chapter 3.2, according to the following increasing order:
Part 1: Types of tanks S L
Part 2: Calculation pressure
G 1.5 2.65 4 10 15 21 bar
Part 3: Openings A B C D
Part 4: Safety valves/devices V F N H
For example:
A tank with the tank code L10CN is authorized for the carriage of a substance to which the tank code L4BN has been assigned;
A tank with the tank code L4BN is authorized for the carriage of a substance to which the tank code SGAN has been assigned.
E: The hierarchy does not take account of any special provisions for each entry (see 4.3.5 and
.8.4).