11.1.1 Plate
heat exchangers are to be classed as follows:
Class 2 where either of the following conditions apply:
-
the maximum metal
design temperature is 150°C or greater; or
-
design pressure is 1,72 MPa or greater.
Class 3 in all other cases.
11.1.2 Where
the design temperature is equal to or lower than minus 10°C, a
higher class is to apply.