Which of the following is irrelevant with the survey of “crude oil washing system”?

A
Testing ballast pipelines that through Cargo tanks and those cargo pipelines that pass through ballast tanks to ensure there is no cross contamination
B
Examing washing piping, pumps, valves and deck-mounted washing machines for leakage.
C
Carrying out pressure testing of the washing system to 1.5 times the working pressure
D
Checking that, when fitted, steam heaters for water washing can be properly isolated during oil washing operations.
E