Division 2 Vessel design

The manufacturer shall, when designing the vessel, define the use to which it will be put, and select:

1. (i)

   the minimum working temperature T_min;

2. (ii)

   the maximum working temperature T_max;

3. (iii)

   the maximum working pressure PS.

However, should a minimum working temperature exceeding – 10 °C be selected, the qualities required of the materials shall be satisfied at – 10 °C.

The manufacturer shall also take account of the following provisions:

1. (i)

   it shall be possible to inspect the inside of vessels;

2. (ii)

   it shall be possible to drain the vessels;

3. (iii)

   the mechanical qualities shall be maintained throughout the period of use of the vessel for the intended purpose;

4. (iv)

   the vessels shall, bearing in mind their prescribed use, be adequately protected against corrosion.

The manufacturer shall take account of the fact that under the conditions of use envisaged:

1. (i)

   the vessels shall not be subjected to stresses likely to impair their safety in use;

2. (ii)

   internal pressure shall not permanently exceed the maximum working pressure PS. However, it may momentarily do so by up to 10 %.

Circumferential and longitudinal seams shall be made using full penetration welds or welds of equivalent effectiveness. Convex ends other than hemispherical ones shall have a cylindrical edge.