Questions and Answers
What is the maximum period allowed between intermediate surveys of a ship's hull as per SOLAS requirements?
36 months
Which type of dry dock is typically constructed on land with solid concrete construction?
Graving dock
Which type of dry dock is commonly used to salvage and carry damaged ships?
Floating dock
What is a distinguishing feature of a floating dry dock?
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How often are ships required to complete a survey of the hull in a dry dock as per SOLAS?
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What happens to the floating dock after a ship slides inside it?
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Study Notes
Dry Dock Survey Requirements
- Ships require a complete survey of the hull in a dry dock twice within a 5-year period and an intermediate survey within 36 months as per SOLAS requirements.
Types of Dry Docks
- There are five main types of dry docks: Graving dock, Floating dock, Marine Rail Dock, Ship lifts, and Marine mobile lifts.
Graving Dry Dock
- A Graving dock is a rectangular solid concrete construction with blocks, walls, and gates near coastal waters.
- The vessel is shifted inside the dry dock and rested on the blocks.
- After the ship is in the required position, the gate is closed and water is removed.
Floating Dry Dock
- A floating dock is a "U" structure used for salvage and repair of damaged ships that cannot sail to a coastal dock.
- It is also used for regular sea-going, small and mid-size vessels.
- Multiple "U" type floating docks can be joined to carry a large vessel.
- The ship is brought near the channel where the floating dry dock will partly submerge itself and the ship slides inside the dock.
- Once the ship is in position, the floating dock is de-ballasted to drain water from its hollow floors and walls to support the vessel on the blocks.
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