3.6.4 The means to ensure the watertight integrity
of internal openings should comply with the following:
-
.1 Doors and hatch covers which are used during
the operation of the unit while afloat should be remotely controlled
from the central ballast control station and should also be operable
locally from each side. Open/shut indicators should be provided at
the control station .
-
.2 Doors or hatch covers which are normally closed
while the unit is afloat should be provided with an alarm system (e.g.
light signals) showing personnel both locally and at the central ballast
control station whether the doors or hatch covers in question are
open or closed. A notice should be affixed to each such door or hatch
cover stating that it is not to be left open while the unit is afloat.
3.6.5 The means to ensure the watertight integrity
of internal openings which are kept permanently closed during the
operation of the unit, while afloat, should comply with the following:
-
.1 A notice should be affixed to each such closing
appliance stating that it is to be kept closed while the unit is afloat;
however, manholes fitted with close bolted covers need not be so marked
.
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.2 On self-elevating units, an entry should be
made in the official log-book or tour report, as applicable, stating
that all such openings have been witnessed closed before the unit
becomes waterborne.