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

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