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.
Minimum Test Pressure (bar)
1.5
T-Code
Minimum Shell Thickness ~
Pressure Relief Provisions
Bottom Outlet Provisions
T1
6 mm *
SRV only required
2 shut-off devices
T2
6 mm *
SRV only required
3 shut-off devices
Minimum Test Pressure (bar)
2.65
T-Code
Minimum Shell Thickness ~
Pressure Relief Provisions
Bottom Outlet Provisions
T3
6 mm *
SRV only required
2 shut-off devices
T4
6 mm *
SRV only required
3 shut-off devices
T5
6 mm *
SRV with in series bursting disc and check gauge
Prohibited
Minimum Test Pressure (bar)
4
T-Code
Minimum Shell Thickness ~
Pressure Relief Provisions
Bottom Outlet Provisions
T6
6 mm*
SRV only required
2 shut-off devices
T7
6 mm *
SRV only required
3 shut-off devices
T8
6 mm *
SRV only required
Prohibited
T9
6 mm
SRV only required
Prohibited
T10
6 mm
SRV with in series bursting disc and check gauge
Prohibited
Minimum Test Pressure (bar)
6
T-Code
Minimum Shell Thickness ~
Pressure Relief Provisions
Bottom Outlet Provisions
T11
6 mm*
SRV only required
3 shut-off devices
T12
6 mm *
SRV with in series bursting disc and check gauge
3 shut-off devices
T13
6 mm
SRV only required
Prohibited
T14
6 mm
SRV with in series bursting disc and check gauge
Prohibited
Minimum Test Pressure (bar)
10
T-Code
Minimum Shell Thickness ~
Pressure Relief Provisions
Bottom Outlet Provisions
T15
6 mm*
SRV only required
3 shut-off devices
T16
6 mm *
SRV with in series bursting disc and check gauge
3 shut-off devices
T17
6 mm
SRV only required
3 shut-off devices
T18
6 mm
SRV with in series bursting disc and check gauge
3 shut-off devices
T19
6 mm
SRV with in series bursting disc and check gauge
Prohibited
T20
8 mm
SRV with in series bursting disc and check gauge
Prohibited
T21
10 mm
SRV only required
Prohibited
T22
10 mm
SRV with in series bursting disc and check gauge
Prohibited
Minimum Test Pressure Varies by Gas
T-Code
Minimum Shell Thickness ~
Pressure Relief Provisions
Bottom Outlet Provisions
T50
Varies by Gas
Varies by Gas
Varies by Gas
T75
Varies by Gas
Varies by Gas
Varies by Gas
~ In reference steel
* 5 mm if diameter < 1.8m
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