The portable tank instructions T1 to T22 apply to liquid and solid substances of Class 1 and Classes 3 to 9. The general provisions of Section 4.2.1 and the requirements of Section 6.7.2 shall be met. The instructions for portable tanks with FRP shells apply to substances of classes 1, 3, 5.1, 6.1, 6.2, 8 and 9. Additionally, the requirements of Chapter 6.9 apply. T7 Minimum test pressure (bar): 4 Minimum shell thickness (in mm-reference steel) (see 6.7.2.4): See 6.7.2.4.2 Pressure-relief requirements (see 6.7.2.8): Normal *) Bottom opening requirements (see 6.7.2.6): See 6.7.2.6.3 *) When the word "Normal" is indicated, all the requirements of 6.7.2.8 apply except for 6.7.2.8.3.

Code L4BV(+): L = Type of tank: Tank for substances in the liquid state (liquids or solids handed over for carriage in the molten state). ------------------------- 4 = Calculation pressure: Minimum calculation pressure: 4 bar (see 6.8.2.1.14) ------------------------- B = Openings (see 6.8.2.2.2): Tank with bottom-filling or bottom-discharge openings with 3 closures. ------------------------- 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. ------------------------- (+) = 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.