week 2 (the main structural members of a ship) Flashcards
The main longitudinal member running along the bottom of the ship from bow to stern.
Purpose:
Acts as the backbone of the ship, providing structural support and helping to keep the vessel stable and upright.
Contribution to the maintenance of the ship’s seaworthiness:
•It helps distribute the ship’s weight and resist bending forces.
•Tt maintains the vessel’s structural integrity and alignment.
Arrangement:
•Positioned along the centerline at the bottom of the hull, extending from the bow to the stern.
Keel
Transverse members that run perpendicular to the keel, forming the ship’s skeleton.
Purpose:
•Provide the primary shape of the hull and support the outer skin of the ship.
Contribution:
•provide the ship with its shape and support the outer hull plating.
•frames prevent deformation and maintain the hull’s strength.
•help to resist bending and flexing forces.
Arrangement:
•Arranged perpendicular to the keel, running across the width of the ship at regular intervals.
Frames (or Ribs)
Sheets of steel or other materials covering the frames and forming the outer surface of the hull.
Purpose:
•Protect the ship’s interior from water and external forces, and contribute to the ship’s overall strength.
Contribution:
•Hull plating provides a protective skin for the ship, preventing water ingress and contributing to the hull’s strength.
•It resists external forces such as waves and impacts, maintaining the vessel’s buoyancy and overall seaworthiness.
Arrangement:
•Arranged transversely across the ship’s length, perpendicular to the keel
Plating (Hull Plates)
Longitudinal members running parallel to the keel, often found on top of the frames.
Purpose:
•Reinforce the hull structure by distributing loads and stresses along the length of the ship.
Contribution:
•Stringers reinforce the hull by running along the length of the ship, adding longitudinal strength.
•Help distribute the stresses and loads from the frames and decks, reducing the risk of structural failure and maintaining the ship’s shape
Arrangement:
•Installed parallel to the keel, often on top of or attached to the frames.
Stringers
Vertical partitions that divide the ship’s interior into compartments.
Purpose:
•Provide structural strength, improve stability, and help in compartmentalizing the ship for safety and efficiency.
Contribution:
•Bulkheads divide the ship into compartments, which improves stability by ensuring that flooding in one compartment does not compromise the entire vessel.
Arrangement:
Positioned vertically across the width of the ship, typically at regular intervals from the bow to the stern.
Bulkheads
Horizontal platforms that divide the ship into different levels.
Purpose:
•Provide working and living spaces, and contribute to the ship’s structural integrity by distributing loads across the hull.
Contribution:
•Decks provide horizontal support and distribute loads across the ship.
•Decks also help manage weight distribution and improve stability.
Arrangement:
•Horizontal layers across the ship, each supported by the frames and stringers, with multiple decks often used for different functions (e.g., cargo hold, accommodation).
Decks
The flat or slightly curved surface forming the stern (rear) end of the ship.
Purpose:
•Supports the rudder and propeller, and provides a boundary for the aft end of the hull
Contribution:
•The transom supports the stern of the ship, providing a structural end to the hull.
•It supports the rudder and propeller, and helps resist the forces from propulsion and steering.
Arrangement:
•The flat or curved plate forming the rear end of the hull, aligned with the stern frame.
Transom
Vertical extensions of the ship’s sides above the deck.
Purpose:
•Provide protection against waves and falling overboard, and contribute to the ship’s safety.
Contribution:
•Bulwarks provide protection against waves and help prevent crew and cargo from falling overboard.
Arrangement:
•Vertical extensions of the ship’s sides, running along the deck from the bow to the stern.
Bulwarks
A movable vertical plate located at the stern of the ship.
Purpose:
•Controls the ship’s direction and steering by redirecting the flow of water.
Contribution:
•The rudder controls the ship’s direction by altering the flow of water around the stern.
•Proper alignment and strength of the rudder ensure effective steering and maneuverability.
Arrangement:
•Located at the stern of the ship, attached to the stern frame.
Rudder
The structural frame at the stern that supports the rudder and propeller.
Purpose:
•Provides a strong foundation for the rear end of the ship, ensuring proper alignment and support for propulsion equipment.
Contribution:
•The stern frame provides support for the rudder and propeller, ensuring they are properly aligned and supported.
It also contributes to the structural integrity of the rear end of the hull.
Arrangement:
Positioned at the stern, forming part of the structure supporting the propulsion and steering equipment.
Stern Frame
The structural frame at the bow (front) of the ship.
Purpose:
•Supports the forward part of the hull and is designed to withstand the forces encountered when the ship is moving forward.
Contribution:
•The bow frame supports the forward end of the ship, helping it withstand the impact of waves and the stresses from heading into the sea.
•It contributes to the ship’s strength and alignment at the bow.
Arrangement:
•Located at the front of the ship, forming part of the hull structure at the bow.
Bow Frame
A structural feature where the bottom of the hull is made with two layers of plating.
Purpose:
•Provides extra strength and space for cargo and tanks, and helps in compartmentalization and damage control.
Contribution:
•It provides additional strength, compartmentalizes the bottom of the ship for ballast, cargo, or fuel, and enhances damage control.
•Helps to maintain stability and protect against potential breaches in the hull.
Arrangement:
•Positioned along the bottom of the hull, with space between the inner and outer plating used for tanks or compartments.
Double Bottom
