4.2.1 Where
a ship is in dry dock or on a slipway it is to be placed on blocks
of sufficient height, and proper staging is to be erected as may be
necessary for the examination of the outside of the hull, rudder(s)
and underwater fittings. The outside surface of the hull is to be
cleaned as may be required by the Surveyor.
4.2.2 The
external shell plating is to be examined for excessive corrosion,
structural deterioration from causes such as high stresses, chafing
or contact with the ground, to areas of structural discontinuity and
for undue unfairness or buckling. Special attention is to be given
to the connection between the bilge strakes and the bilge keels.
4.2.3 The
following parts of the external hull structure are to be specially
examined:
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For steel hulls
attention is to be given to parts of the structure particularly liable
to excessive corrosion and to any undue unfairness of the plating
of the bottom. The coating system is to be examined and made good
as necessary.
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For aluminium
alloy hulls attention is to be given to areas adjacent to any bimetallic
connections at skin fittings, etc.
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For composite
hulls the gelcoat or other protective finish is to be examined for
surface cracking, blistering, abrasion or other damage which may impair
the efficiency of the protection to the underlying laminate.
4.2.4 Where
fitted, the satisfactory condition, attachment and operation of the
cathodic protection (active or passive) is to be confirmed.
4.2.5 The sea connections, scuppers and sanitary discharges, their attachments
to the hull and the gratings at the sea inlets are to be examined. Where applicable,
pressure testing of the rudder may be required if deemed necessary by the Surveyor.
4.2.6 The
clearances of the rudder bearings and pintles are to be measured.
Where considered necessary by the Surveyor, rudders and stabilisers
are to be lifted for examination of the stock. The securing of rudder
and stabiliser couplings is to be confirmed.
4.2.7 Special
attention is to be given to the hull in way of underwater fittings
such as thrusters, shaft brackets, stabilisers, rudders, rope guards,
eddy plates, GRP domes, bilge keels, echo sounders, and their attachments.
4.2.8 Where
applicable, attention is to be given to the connection and/or intersection
of the cross-deck structure to the hulls of multi-hull ships.
4.2.10 For
Surface Effect Ships any flexible skirts together with their attachment
are to be examined.
4.2.11 For
hydrofoil or foil assisted craft the attachment of foils is to be
examined.
4.2.12 The
Surveyor is to verify all draught markings as applicable at the time
of dry-docking.
4.2.13 When
Machinery Naval Class has been adopted, the following items are additionally
applicable. The work is to be carried out in accordance with maintenance
manuals and the manufacturer’s recommendations for servicing
and renewals observed.
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The propeller
and fastenings are to be examined. (Where a controllable pitch propeller
is fitted, examination is to include blade fastenings and hub). The
sternbush is to be examined as far as practicable.
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Where propeller
shafts are wrapped for corrosion protection, the condition of the
wrapping is to be confirmed.
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The clearance
in the sternbush or the efficiency of the oil glands is to be ascertained.
The clearance of any shaft bracket bearing is to be ascertained.
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The inboard shaft
seals or glands are to be examined. Where flexible sternglands are
fitted, the satisfactory condition of the rubber hose and securing
clips is to be confirmed. Where inflatable shaft seals are fitted,
their condition and operation are to be verified.
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Visible parts of side thrusters are to be examined. Other propulsion systems which
also have manoeuvring characteristics (such as directional propellers, vertical
axis propellers, water jet units) are to be examined externally with focus on the
condition of gear housing, propeller blades, bolt locking and other fastening
arrangements. Sealing arrangements of propeller blades, propeller shaft and
steering column are to be verified.
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Where water jet
units are fitted, the impeller, hull ducting, grating, nozzle steering
and reversing arrangements are to be examined as far as practicable.
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Where podded
propulsion units are fitted, the bearings and sealing arrangements,
steering ring and thrust bearings in the hull are to be examined as
far as practicable.