10.1.1 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 17,2 bar, or greater. Class 3 in all other cases.
10.1.2 Where
the design temperature is equal to, or lower than minus 10°C,
a higher class is to apply.