T-codes

The below table defines the T-code or "portable tank instruction" in terms of test pressure, shell thickness, pressure relief set up and bottom outlet arrangement. These T-code instructions apply to dangerous goods of classes 1 and 3 to 9. Class 2, or non-refrigerated liquified gases are covered by the T50 code.

Code	Minimum Test Pressure	Minimum Shell Thickness	Pressure Relief Provisions	Bottom Opening Provisions
T1	1.5	5 mm if D < 1.80 m or 6 mm if D > 1.80	Normal (no bursting disc required)	2 shut-off devices
T2	1.5	5 mm if D < 1.80 m or 6 mm if D > 1.80	Normal (no bursting disc required)	3 shut-off devices
T3	2.65	5 mm if D < 1.80 m or 6 mm if D > 1.80	Normal (no bursting disc required)	2 shut-off devices
T4	2.65	5 mm if D < 1.80 m or 6 mm if D > 1.80	Normal (no bursting disc required)	3 shut-off devices
T5	2.65	5 mm if D < 1.80 m or 6 mm if D > 1.80	Safety relief valve with bursting disc in series	Not allowed
T6	4	5 mm if D < 1.80 m or 6 mm if D > 1.80	Normal (no bursting disc required)	2 shut-off devices
T7	4	5 mm if D < 1.80 m or 6 mm if D > 1.80	Normal (no bursting disc required)	3 shut-off devices
T8	4	5 mm if D < 1.80 m or 6 mm if D > 1.80	Normal (no bursting disc required)	Not allowed
T9	4	6 mm	Normal (no bursting disc required)	Not allowed
T10	4	6 mm	Safety relief valve with bursting disc in series	Not allowed
T11	6	5 mm if D < 1.80 m or 6 mm if D > 1.80	Normal (no bursting disc required)	3 shut-off devices
T12	6	5 mm if D < 1.80 m or 6 mm if D > 1.80	Safety relief valve with bursting disc in series	3 shut-off devices
T13	6	6 mm	Normal (no bursting disc required)	Not allowed
T14	6	6 mm	Safety relief valve with bursting disc in series	Not allowed
T15	10	5 mm if D < 1.80 m or 6 mm if D > 1.80	Normal (no bursting disc required)	3 shut-off devices
T16	10	5 mm if D < 1.80 m or 6 mm if D > 1.80	Safety relief valve with bursting disc in series	3 shut-off devices
T17	10	6 mm	Normal (no bursting disc required)	3 shut-off devices
T18	10	6 mm	Safety relief valve with bursting disc in series	3 shut-off devices
T19	10	6 mm	Safety relief valve with bursting disc in series	Not allowed
T20	10	8 mm	Safety relief valve with bursting disc in series	Not allowed
T21	10	10 mm	Normal (no bursting disc required)	Not allowed
T22	10	10 mm	Safety relief valve with bursting disc in series	Not allowed
T50	Varies by Gas	Varies by Gas	Varies by Gas	Varies by Gas

T11 24,000L T11 26,000L T14 14,300L T50 22,500L T22 22,500L T11 31,000L Swap T11 35,000L Swap T11 7,500L Mini Tank Refrigerated TC Chassis More specs available from regional offices.