T10 is the IMDG Code Chapter 6.7 portable tank instruction at 4 bar test pressure with 6 mm reference-steel shell explicitly required, no bottom outlet, and a frangible-disc plus tell-tale-gauge relief regime. Mechanically identical to T9 in build; the IMDG distinguishes T9 and T10 by hazard-axis specifics in the per-UN-entry assignments rather than by mechanical difference.
What T10 is built for
The IMDG Dangerous Goods List assigns T10 to specific UN entries that combine high hazard with the same 4 bar / no-BO / frangible-disc profile as T9. The substitution rule of IMDG 4.2.5.2.5 allows a T10 cargo to also ride T11 through T22, which in practice means most T10 cargoes ship in T14 builds because the T14 fleet is bigger and the 6 bar test pressure provides margin.
Construction and materials
Identical to T9 from a build standpoint: 316L stainless cylinder, 6 mm reference shell, ASME U-stamp, top discharge through a dip-pipe, frangible disc plus tell-tale gauge.
When T10 is the right choice
T10 is the right tank when IMDG DGL Column 13 specifies T10 for the UN entry and an operator has T10-spec inventory. In commercial trade T10 bookings are rare; the substitution into T14 is the common operating choice.
When T10 is the wrong choice
T10 is the wrong tank for any cargo IMDG DGL assigns to T11 / T14 / T19 / T20 / T22 where the higher pressure or thicker shell is required.