-  L E X I C O N



A B C D ---Please note that not for all letters contents are put in.
E F G H ---These letters in the list are black. To go back to the
I J K L ---selection list please click "back!" next to the topic!
M N O P ---
Q R S T ---
U V W X  
Y Z  
Sources: THE TUG BOOK / by M.J.Gaston, TUGS USE IN PORT / by Captain Henk Hensen

 

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Anchor-Handling

Laying and retrieving the anchors for oil rigs, dredgers and other offshore floating plants.

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ASD- Tug

Special tugboat called "azimuth sterndrive tug". The thruster are at the stern of the hull.

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Bitts

A heavy construction to secure ropes for mooring and towing on it. You will find it often in pairs. See also Bollard

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Bollard see Bitts.
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Bollard Pull

The towing force produced by a tug pulling against a static bollard. ( in tons or tonnes )

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Bow Thruster A special thruster to help the ship going sideways. Also to help while manoeuvering.
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Brake Horse Power (bhp)

The power generated by diesel engine under test conditions. While this test the engine is coupled to a dynamometer.

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Bridle

Two short pieces of a ropes building a "Y". It is used to make a connection between the tug and the tow. See also Gog rope!

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Bulwark Plating on the ship sides above the deck level
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Capstan

Small winch used for hauling ropes and towlines.

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Chaser

A chaser is used for anchor-handling. With this tool then anchor can located and heave from the bed of the sea.

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Combi-Tug

A conventional tugboat fitted with an steerable azimuth thruster beneath the bow.

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Controllable-Pitch-Propeller The pitch of this propeller can be controlled and so the speed can be changed.
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Dead Ship This ship is without engine and steering. Systems are out of order.
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Deadweight

The weight in tonnes of cargo, stores, fuel oil, passengers and crew of a ship loaded to its loadline.

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Dry Towing

A vessel loaded on a barge. Often use when it is too difficult to tow this vessel.

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DWT short for: Dead Weight Tons
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Fairlead A "hole" in the bulwark or a fitting at the deck used for guiding the rope. Very often made of stainless steel to prevent the rope chafing.
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Flanking Rudders

Additional rudders in front of the propellers.

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Flybridge

Helmsman stand on to top of the bridge.

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Girding

Describes the movement of a tugboat which capsized by the action of the towed ship. Means the same like girting.

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Gogrope

Arope to control the position of the towline on conventional tugs. Used to prevent the capsizing of the tugboat. Also named Gobrope or Stoprope.

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Gross tonnage

The volume of the hull. 100 cubic feet is 1 gross ton. The formulars which used can be vary between the registration companies.

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Heaving Line

A light rope to haul the towing line onto the vessel which will be towed.

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Indicated Horse Power

The theoretical power of a diesel or steam engine.

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Messenger

A rope with a small diameter used to haul the towing line.

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Molgoggers see Norman Pins
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Norman Pins

Pin which can be erected at the stern bulwark of the tugboat to guide the towing line.

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Nozzles

Looks like a small piece of a tube around the propellers to enforce the thurst.

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Pendant

It is a short piece of steel wire at the end of the towing line to prevent this agianst chafing. Also named Pennant.

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Pitch

The distance ( theoretical ) the propeller will go ahead at one rotation.

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Pushknees

Fitted a the bow of the hull to enforce the structures. Used to push barges.

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Rotortug

a tractor tug with an additional azimuth-thurster instead of the skeg at the stern of the tug. Developed by KoTug.

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Rubbingband

A band around the hull to protect against damage.

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Running Crew

Additonal crew on a towed ship.

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Ship Docking Module (SDM)

A special tugboat from the USA which has two azimuth propellers, one fore and one after. The thrusters are also set one to port and one to starboard beside the midship line.

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Ship-Handling

Help a ship in difficult waters.

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Skeg

A fin beneath the stern part of the hull to improve the course stability and the indirect towing force.

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Splice

A method to connect to piece of a rope or forming an eye.

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Spring

A piece of rope in the towline with elasticity to reduce shocks during the tow. This term is also use for a line which prevent against fore or aft movements of a ship at the pier.

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Stern Thruster

see bow thruster, this device is located at the stern of the ship.

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Stopper

Used to secure the towingline for a moment while repairs can do.

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Superstructure

Term for the deckshouse with the accomodation, wheelhouse and similar structures onto the deck.

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Tackle

A combination of blocks and ropes to support hauling and heaving.

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Towbeams

Protective tubes over the tugboats aftdeck to prevent the line fouling at the deckfittings. Most of these tubes connect the bulwarks at both sides of the ship.

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Towline no comment
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Tractor Tug

A tugboat which has the propulsion units beneath the bow.

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Wheelhouse

Main control position on a tugboat. (bridge)

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Winch

A tool for hauling of the towline.

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Z-TECH

A new tugboat developed by Robert Allan Ltd. which connects the andvantages of ASD and tractor in one tugboat.

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