You are planning to use a crude oil washing system. What precaution must be taken with the tank as the source for the washing machines?

A
It must be debottomed and the level lowered by at least one meter.
B
The oil in the source tank must be sampled for compatibility.
C
The source tank must have been crude oil washed at least once in the past 150 days.
D
The inert gas system must lower the oxygen content to a maximum of 12% oxygen in the tank.
E