6.2.1 The following features are to be incorporated into the unit’s design,
where applicable, in order to facilitate the underwater inspection. When verified,
they will be noted in the unit’s classification for reference at subsequent
surveys.
6.2.2
Stern bearing. For self-propelled units, means are to be provided for
ascertaining that the seal assembly on oil-lubricated bearings is intact and for
verifying that the clearance or weardown of the stern bearing is not excessive. For
oil-lubricated bearings, this may only require accurate oil loss rate records and a
check of the oil for contamination by sea-water or white metal. For wood or rubber
bearings, an opening in the top of the rope guard and a suitable gauge or wedge
would be sufficient for checking the clearance by a diver. For oil-lubricated metal
stern bearings, weardown may be checked by external measurements between an exposed
part of the seal unit and the sterntube bossing, or by use of the unit’s weardown
gauge, where the gauge wells are located outboard of the seals, or the unit can be
tipped. For use of the weardown gauges, up-to-date records of the base depths are to
be maintained on board. Whenever the stainless steel seal sleeve is renewed or
machined, the base readings for the weardown gauge are to be re-established and
noted in the unit’s records and in the survey report.
6.2.3
Rudder bearings. For self-propelled units with rudders, means and access are
to be provided for determining the condition and clearance of the rudder bearings,
and for verifying that all parts of the pintle and gudgeon assemblies are intact and
secure. This may require bolted access plates and a measuring arrangement.
6.2.4
Sea suctions. Means are to be provided to enable the diver to confirm that
the sea suction openings are clear. Hinged sea suction grids would facilitate this
operation.
6.2.5
Sea valves. For the Bottom Surveys associated with the Special Survey, means
must be provided to examine any sea valve.
6.2.6 Alternative arrangements to facilitate In-water Surveys will be
considered; details are to be submitted to LR for approval.