2.1 After the tanker has been safely berthed ballast
may be discharged:
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.1 before the cargo is loaded; and
-
.2 during the loading of cargo either simultaneously
or by interrupting the loading provided there is an effective two-valve
separation between the cargo and clean ballast system, or when cargo
tanks are served by individual pumps.
2.2 Until sufficient clean ballast has been discharged
the piping and pumping arrangement servicing the dedicated clean ballast
tanks must be kept clean.
2.3 Upon completion of ballast discharge all valves
to the dedicated clean ballast tanks are to be shut, the clean ballast
piping drained and utilized for the loading of cargo.
2.4 The tanker should be loaded taking into account
the requirements of a discharge sequence compatible with the operational
procedures for dedicated clean ballast tanks with particular reference
to trim and stress levels if the cargo is to be unloaded at two or
more discharge ports.
2.5 Slop tanks must be loaded with cargo that
will be discharged well before any ballasting operation has to be
carried out. If pipe flushing is required during the loaded passage
sufficient ullage must be left in the slop tanks to accommodate the
necessary flushing water.
2.6 At the completion of loading all valves to
the cargo tanks shall be closed.