Podcast
Questions and Answers
What is the purpose of twistlocks in container shipping?
What is the purpose of twistlocks in container shipping?
To lock the container stack together at the corner posts.
How are lashing rods used to secure containers in upper deck stow positions?
How are lashing rods used to secure containers in upper deck stow positions?
They are used in conjunction with a turnbuckle.
What is the function of a single stacking cone in container shipping?
What is the function of a single stacking cone in container shipping?
To provide alignment and shear restraint in a stack of containers.
When are extension rods used in container shipping?
When are extension rods used in container shipping?
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What is the purpose of penguin hooks in container shipping?
What is the purpose of penguin hooks in container shipping?
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What is the primary function of cell guides on a container ship?
What is the primary function of cell guides on a container ship?
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How are containers stowed and secured in the holds of a container ship?
How are containers stowed and secured in the holds of a container ship?
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What is a lashing bridge, and what is its purpose on large container ships?
What is a lashing bridge, and what is its purpose on large container ships?
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On what size of container ships are lashing bridges typically equipped?
On what size of container ships are lashing bridges typically equipped?
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Describe the modern practice of securing containers on large ships with lashing bridges.
Describe the modern practice of securing containers on large ships with lashing bridges.
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Study Notes
Dovetail Foundations
- Dovetail foundations, also known as dovetail shoes, are used to secure hatch tops and deck stow positions.
- Portable bottom twistlocks are fitted in these units.
Fixed Lashing Points
- D-rings and Pad-eyes are fixed lashing points welded on decks for attaching turnbuckles.
Portable Securing Gear
- Twistlocks are used to interlock containers in tiers.
- Twistlocks consist of a steel body with a central shaft and cones at both ends.
- The cones are placed in a longitudinal direction and then rotated to a transverse direction to lock the containers vertically.
- Twistlocks come in many variations, but their purpose is to lock the container stack together at the corner posts.
Lashing Rods
- Lashing rods are used to secure containers on upper deck stow positions when carried in two tiers or more.
- Extension rods are attached to lashing rods to secure High cube containers.
- Lashing rods are used in conjunction with a turnbuckle.
Turnbuckles
- Turnbuckles, or Bottle screws, are used to connect lashing wires or lashing rods to lashing plates or D-rings.
- Tightening the screw puts tension into the lashing wires or lashing rods.
Single Stacking Cones
- Single Stacking Cones are devices inserted into container corner fittings to provide alignment and shear restraint in a stack of containers.
- They are placed between containers in a stack and slot into corner castings.
Double Stacking Cones
- Double Stacking Cones are devices that fit into container corner fittings to connect adjacent stacks of containers.
- They are placed between containers in adjacent stacks and slot into corner castings.
Bridge Fitting
- Bridge fittings are devices that connect the top most corner fittings of two adjacent stacks of containers.
Extension Rods
- Extension rods are used to extend the length of lashing rods as and when required.
- The hook end is attached to the lashing rod and the eye attached to the turnbuckle.
Penguin Hooks
- Penguin hooks are used as a supporting device in conjunction with a special lashing rod with an eye end.
Cell Guides
- Cell guides are a series of vertical steel angles in the hold, suitably spaced according to container lengths and widths.
- They provide alignment and horizontal restraint for container stacks on a container ship.
- Containers are guided by these rails of the cell guides during loading and unloading.
Lashing Bridge
- Lashing bridges are dedicated constructions used to securely lash containers on board.
- They are equipped on large ships over 5,000 Teu and designed to restrain racking forces from container stack loads.
- Lashing bridges allow the anchoring points for each stack to be moved higher up the stack, making the lashings more effective in reducing the tipping moments acting on a stack when a vessel is rolling heavily.
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Description
Learn about cell guides, which are vertical steel angles in a container ship's hold used for aligning and restraining container stacks. Understand how containers are stowed and secured using cell guides during loading and unloading processes.
