Code LGAV(+):

L = Type of tank:

Tank for substances in the liquid state (liquids or solids handed over for carriage in the molten state).
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G = Calculation pressure:

Minimum calculation pressure according to the general requirements of 6.8.2.1.14.
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A = Openings (see 6.8.2.2.2):

Tank with bottom-filling or bottom-discharge openings with 2 closures.
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V = Safety valves/devices:

Tank with a breather device, according to 6.8.2.2.6, but no device protecting against the propagation of a flame; or non-explosion pressure shock resistant tank.
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(+) = The indication of a "(+)" after the tank code means that the substance is subject to special provisions. In that case the alternate use of the tanks for other substances and groups of substances is permitted only where this is specified in the certificate of type approval. Higher value tanks according to the provisions at the end of the table in 4.3.4.1.2 may be used with due regard to the special provisions indicated in Column (13) of Table A in Chapter 3.2.