ANCHOR (1) Flashcards
A device, usually of metal, attached to a ship or boat by a cable or chain and lowered to the seabed to hold the vessel in a particular place by means of a fluke or pointed projection that digs into the sea bottom
generally made of metals resistant to long-term corrosion that use suitable methods of protection such as electroplating and galvanization
ANCHOR
uses flukes attached to the central arm of the anchor, commonly referred to as the shank
Flukes are structures similar to the tines of a fork, that are used to provide grip and weight to the anchor
This design was most commonly used in ships belonging to the early British and Viking sailors
FLUKE ANCHORS
uses two flukes attached to the central shank by arms perpendicular to the main axis
A long bar attached to the inter section between the shank and chain links is known as the stock
used to pull the anchor towards the ocean bed or floor until one of the flukes finally digs into the bottom and settles in
ADMIRALTY ANCHORS
It involved a basic admiralty anchor design that had projections along the bottom which forced the flukes to sink in to the ocean bed or floor
the holding power of the stockless anchors is less than their admiralty counter parts
widely used these days because of ease of storage
STOCKLESS ANCHORS
are shaped like inverted mushrooms, with the head being laid in the sea or ocean bed
utilizes its weight, suction power and relative friction between the bed and anchor head to keep itself firmly attached to the strata of the ocean floor
it only works in conditions when mud, silt or sand are prevalent on the floor of the ocean
MUSHROOM ANCHORS
makes use of the physics behind the high retention power of screw design, and their ability to remain locked in a position for extended periods
consist of large threaded heads that are drilled into the bed of the sea or ocean where the structure is to be installed
Often instead of directly being driven into the ocean floor, a casing is first attached to the bottom of the ocean, with grooves cut into it. The casing and screw heads are often made from titanium or similar alloys and materials resistant to rusting and corrosion from exposure to water and underwater organisms
AUGER PERMANENT ACHORS
characterized by their High Holding Power (HHP) or Super High Holding Power (SHHP)
used in the oil and gas industry to tether large semi-submersible structures or to hold down underwater pipelines running across the ocean bed or seafloor
must exhibit strength and retention capabilities equal to twice the normal values of conventional anchors
HIGH HOLDING PERMANENT ACHORS
an extension of the hull just below the load waterline
The basic purpose is to create a low-pressure zone to reduce or eliminate the bow wave and reduce the resulting drag
BULBOUS BOW
a type of propeller-shaped system fitted either on the bow (forward part) and stern part (known as a stern thruster) of the ship
they are smaller in size as compared to the ship’s propeller and help in better maneuverability of the vessel at lower speeds
generally used for maneuvering the ship near the coastal waters, channels or when entering or leaving a port while experiencing bad currents or adverse winds
BOW THURSTERS
is the living space where cabins for ship’s crew are located, along with galley, provision stores & refrigeration, messrooms, recreational rooms, gymnasium, meeting rooms, lockers, etc.
is supported by water supply, sewage system, air condition system, fire safeties, etc.
SHIP’S ACCOMMODATION
