CHIEF ENGINEER Unit 16 Dry Docking Procedure Flashcards

CHIEF ENGINEER Unit 16 Dry Docking Procedure

In a Vertical Ship Lift, what guides the platform to ensure it stays aligned while moving?

B) Guiding rails or tracks

Why should electrical power to dock lighting and equipment in the dry dock be secured before flooding?

B) To minimize risk of electrical hazards during flooding

Why is it necessary to confirm that all hull openings, such as sea chests and valves, are properly secured before flooding?

A) To maintain buoyancy and prevent water from entering the vessel unexpectedly

Before flooding, which system on the vessel should be tested to ensure functionality in case of emergencies?

B) Fire-fighting system

What action should be taken regarding scaffolding and tools in the dry dock before flooding?

B) Move them away to ensure no debris is left in the dry dock

How is the ship raised and lowered in a Vertical Ship Lift system?

C) Through hydraulic or winch-driven vertical movement of the platform

Why must docking personnel be especially vigilant during the critical period?

B) To monitor for any structural signs of stress or shifting of the vessel on the blocks

Who is responsible for signing the authority for a Flood Certificate before flooding a dry dock?

C) The Dock Master or authorized dock personnel

What is meant by the "critical period" when a vessel is settling onto dock blocks?

B) The moment when the vessel's weight transfers from water buoyancy to dock blocks

What is another advantage of a Vertical Ship Lift over traditional methods?

B) It occupies less horizontal space, making it ideal for space-constrained areas

Which of the following should be checked before flooding a dry dock?

A) Ensure all workers have left the dry dock area

What is another potential disadvantage of a Vertical Ship Lift?

B) It requires additional safety measures for heavier ships

What must be inspected to prevent water leakage into the dry dock during flooding?

C) The integrity of all dock gates and seals

During the critical period, why is it essential to control the vessel’s descent onto the blocks carefully?

C) To ensure an even distribution of the vessel's weight on the blocks

What is one key way to reduce the risk associated with the critical period?

B) Gradually lowering the water level to allow slow and controlled settling

Which platform component is essential to support the ship during lifting on a Vertical Ship Lift?

C) Load-bearing steel platforms with adjustable cradles

What final inspection should be conducted regarding the dock’s pumping and dewatering system before flooding?

B) Verify the system’s readiness to ensure efficient water inflow

What should be the last action taken before initiating the flooding of the dry dock?

B) Get clearance from responsible personnel

Why is the critical period considered dangerous for the vessel’s structure?

C) The vessel experiences a loss of even buoyant support, which can create stress concentrations

What additional measure can help ensure a safe transfer of weight during the critical period?

B) Adjusting the block layout to match the hull’s support needs

What is a key structural feature of a Vertical Ship Lift that enables it to move vessels?

B) It has a set of hydraulic jacks or winches

Which of the following is a disadvantage of a Vertical Ship Lift?

B) It has a high installation and maintenance cost

Which of the following is an advantage of a Vertical Ship Lift?

B) It allows faster lifting and lowering compared to traditional dry docks

Which of the following structural risks is increased during the critical period of dry-docking?

B) Hull deformation or buckling
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