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Maintaining stability after major repair work onboard container ship

Container ship prior departure

As the nature of container ship operation, it’s tread to be lack of stability, due to Top Heavy Load, the Master shall always take special attention for her stability. Also the Master should remind factors to cause reducing stability more such as Alternating course with Big angle of Rudder, Towing by tugs at the scene of Berthing / Un-berthing, etc.

In principle, IMO designated criteria of minimum GoM for Container ship should always be considered.

If the Master observes deviating from the above criteria, even though applying the best Ballast and Fuel layout, the Terminal planner / Central planner must be informed and cargo stow plan appropriately modified. Stability may similarly affect securing equipment. If the vessel is excessively stiff she may be subject to a short rolling period, creating greater loads on all equipment and fittings. Also it has a great influence on “Lashing strength for containers on deck.

Check items upon completion of repair works

Upon completion of the repair works the vessel is to sail from the yard in a safe condition as soon as possible. It is essential however, that adequate function tests and inspections are carried out under the supervision of superintendent of all safety systems and systems that had been disturbed during the repair period.

A suitable checklist is to be compiled in order to ensure that all critical equipment, such as key navigational, propulsion, steering, cargo, ballast, fire and gas detection systems are tested. Also to be included is the replacement of bottom plugs, anodes, sea chest valves correctly set and ensuring echo sounder and Doppler transducers are cleared and written confirmation that all personnel are adequately rested before departure.

Suitable checklist to be completed by the Master under the supervision of the Fleet Superintendent after completing repairs, before and during flooding and prior to departure from the repair facility. A further checklist on testing of safety automation and protection devices is also to be completed). The completed checklists are to be sent to the management office in advance of sailing.

Prior to departure from a repair / dry-docking facility, it is imperative that the vessel emails / faxes to the management office the completed and signed forms. Entries must be made in the deck and engine room log books upon completion.

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