Dry-Docking

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    Dry Dock
Periods

A
docking survey should be carried out twice within a 5 year period. The
intermediate survey must be completed within 3 years. One of the two docking
surveys within the 5 year period should coincide with a special survey. A Docking
Survey is considered to coincide with the Special Survey when held within the
15 months prior to the due date of the Special Survey
An in water survey may be
accepted in lieu of the intermediate survey
For vessels operating in fresh
water special consideration may be given.

In-water
Surveys

An
In-water Survey may be accepted in lieu of the intermediate docking between
Special Surveys, an *IWS notation is assigned. This requires suitable
underwater protection for the hull in part taking the form of high resistance
paint. This survey is to provide information normally obtained from a docking
survey.
The In-water Survey is to be carried out at agreed geographical locations under
the surveillance of a Surveyor to LR, with the ship at a suitable draught in sheltered
waters; the in-water visibility is to be good and the hull below the waterline
is to be clean. The Surveyor is to be satisfied that the method of pictorial
presentation is satisfactory. There is to be good two-way communication between
the Surveyor and the appropriately qualified diver.

Should damage be found a dry dock may be required for better inspection

Dry Dock
file

Preparation
for dry dock begins after the ship sails from its previous one. A dry-dock list
of new items is created with specification sheets describing individual jobs.
These sheets are compiled into a dry dock file which some time before the due
date of the docking is submitted to several dry docks for pricing.
The jobs are priced individually and as a whole. This allows the ship managers
to streamline the jobs to provide maximum value for money.

Preparation

The
vessel must be prepared before entering the dry dock. Structural loading must
be taken into account as the vessel is to be point supported on blocks. A
docking plan of the ships which shows such things as drain plugs, sea boxes,
underwater attachments etc is sent to the dry dock. Added to this are
indications where hull repairs are required. This allows the drydock ship
managers to place the blocks on which the vessel will sit.
The vessel must be trimmed so as to be equal draught with zero list. Special
attention should be made when planning this for any tanks whose contents may be
varied due to repair or housekeeping requirements.

In dock

The
safety and fire fighting responsibilities of the vessel are handed over to the
dry dock safety department for the duration of the dry and wet dock period. All
hot work, tank entry or jobs requiring special safety measures carried out by
ships crew must be first agreed with the dry dock safety department. A daily
meeting is held to discuss forth coming jobs and any special requirements. This
also allows the vessels staff and company representatives to monitor the
progress of the dock.

Inspections
& Measurements

·        
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 shell including bottom
and bow plating, keel, stern, sternframe and rudder. The rudder is to be lifted
for examination of the pintles if considered necessary by the Surveyor.

·        
Attention is to be given to parts of the
structure particularly liable to excessive corrosion or to deterioration from
causes, such as chafing and lying on the ground, and to any undue unfairness of
the plating of the bottom.

·        
The clearances in the rudder bearings are to
be measured.

·        
The sea connections and overboard discharge
valves and their attachments to the hull are to be examined.

·        
The propeller, sternbush and sea connection
fastenings and the gratings at the sea inlets are to be examined.

·        
The clearance in the sternbush or the
efficiency of the oil glands is to be ascertained.

·        
When chain cables are ranged, the anchors and
cables are to be examined by the Surveyor

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