There are five categories of discharges that may be associated
with the operation of fixed or floating platforms covered by this
regulation when engaged in the exploration and exploitation of mineral
resources, i.e.:
-
.1 machinery space drainage;
-
.2 offshore processing drainage;
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.3 production water discharge;
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.4 displacement water discharge; and
-
.5 contaminated seawater from operational purposes
such as produced oil tank cleaning water, produced oil tank hydrostatic
testing water, water from ballasting of produced oil tank to carry
out inspection by rafting.
Only the discharge of machinery space drainage and contaminated
ballast should be subject to MARPOL (see diagram shown in appendix
5).