The IMO type, like IMO Type 1, IMO Type 2, and IMO Type 5, was the original classification system for tank containers, but this was replaced by the “T” code system in 2001.
This is helpful because it includes more specific details such as test pressure, shell thickness, pressure relief setup, and outlet arrangement (both top and bottom). The “T” code identifies tank containers from T1 to T22, T50 and T75 tank container codes. And also defines the type of cargo each container can transport.
All containers are classified according to the international standard ISO 6346. This code, also called the size type, indicates the length of the container and the type of container. For example, in code 22T4, the first 2 show a length of 20 feet, and the second 2 stand for 8.6 feet high. T4 indicates the type of container, as described in the table below.
All hazardous materials have a substance identification number or 'UN number' and a 'packing group.' With this combination, it is possible to determine which type of tank container is required for transport based on the regulations -IMDG Code, ADR, RID, and so on. T1 through T3 label containers for non-hazardous products, and the codes from T4 onwards concern hazardous substances.
Refer to Chapter 4.2 of the ADR or IMDG code for full details of T codes and detailed provisions for individual substances.
Instructions for portable tanks specify the provisions applicable to a tank container when it is used to transport specific hazardous substances. T codes T1 to T22 specify the minimum test pressure and the minimum wall thickness of the tank container (referred to in mm reference steel) and the pressure relief valve and bottom opening provisions.
These portable tank instructions apply to liquid and solid substances of classes 3 to 9.
The general provisions of IMDG Section 4.2.1 and the requirements of Section 6.7.2
|Portable Tank||Minimum test||Minimum shell thickness||Pressure-relief||Bottom opening|
|Instruction||pressure (bar)||(in mm-reference steel)||requirements||requirements|
|(see IMDG 188.8.131.52)||(see IMDG 184.108.40.206)||(see IMDG 220.127.116.11)|
|T1||1,5||>or = 6mm||normal||int + ext|
|T2||1,5||>or = 6mm||normal||Int+ext+cap/blank|
|T3||2,65||>or = 6mm||normal||int + ext|
|T4||2,65||>or = 6mm||normal||Int+ext+cap/blank|
|T5||2,65||>or = 6mm||normal + rupture disc||not allowed|
|T6||4||>or = 6mm||normal||int + ext|
|T7||4||>or = 6mm||normal||Int+ext+cap/blank|
|T8||4||>or = 6mm||normal||not allowed|
|T9||4||6 mm||normal||not allowed|
|T10||4||6 mm||normal + rupture disc||not allowed|
|T11||6||>or = 6mm||normal||Int+ext+cap/blank|
|T12||6||>or = 6mm||normal + rupture disc||Int+ext+cap/blank|
|T13||6||6 mm||normal||not allowed|
|T14||6||6 mm||normal + rupture disc||not allowed|
|T15||10||>or = 6mm||normal||Int+ext+cap/blank|
|T16||10||>or = 6mm||normal + rupture disc||Int+ext+cap/blank|
|T18||10||6 mm||normal + rupture disc||Int+ext+cap/blank|
|T19||10||6 mm||normal + rupture disc||not allowed|
|T20||10||8 mm||normal + rupture disc||not allowed|
|T21||10||10 mm||normal||not allowed|
|T22||10||10 mm||normal + rupture disc||not allowed|
|T23||Depending on product||Depending on product||Depending on product||Depending on product|
|T50||Depending on gas||Depending on gas||Depending on gas||Depending on gas|
|T75||Depending on gas(frozen)||Depending on gas(frozen)||Depending on gas(frozen)||Depending on gas(frozen)|
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