The following table indicates which modules are to be followed when undertaking conformity assessment procedures.
| Category of transportable pressure vessel | Modules |
|---|---|
| Vessels for which the product of the test pressure and the capacity is no more than 30 Mpay litre (300 barylitre) | A1, D1, or E1 |
| Vessels for which the product of the test pressure and the capacity is more than 30 and no more than 150 Mpay litre (300 and 1500 bary litre respectively) | H, B in combination with E, B in combination with C1, B1 in combination with F, or B1 in combination with D |
| Vessels for which the product of the test pressure and the capacity exceeds 150 Mpay litre (1500 bary litre) | G, H1, B in combination with D, or B in combination with F |