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What is the gross tonnage of a ship?

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What is the gross tonnage of a ship?

Gross tonnage (GT) is a function of the volume of all of a ship’s enclosed spaces (from keel to funnel) measured to the outside of the hull framing. The numerical value for a ship’s GT is always smaller than the numerical values of gross register tonnage (GRT).

How do you calculate net tonnage of a ship?

It is calculated by subtracting non-revenue-earning spaces i.e. spaces not available for carrying cargo, for example engine rooms, fuel tanks and crew quarters, from the ship’s gross register tonnage. Net tonnage is thus used in situations where a vessel’s earning capacity is important, rather than its mere size.

How is cargo capacity of a ship calculated?

On cargo ships, it’s a two dimensional thing – volume and weight. A ship’s cargo volume capacity is indicated by the net tonnage indicated on its tonnage certificate. Each ton for gross or net tonnage is 100 cubic feet. If very heavy cargo is carried, the ship’s loadout is limited to the amount of cargo deadweight.

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What is engine margin?

An engine margin, normally 10-15\% of its maximum continuous rating (MCR), is recommended in order to lower fuel and maintenance costs and to have reserve power for increased speed. This means that specified service speed is to be achieved with 85-90\% of the MCR.

How much power does a ship need?

Usually, ships are powered by four or five generator sets (medium-speed, 500 revolutions per minute), fueled by diesel and creating 8-10 MW energy each. The power density of marine diesel medium-speed engine is 80 kilowatts per cubic meter.

What is relation between GRT NRT and DWT?

There is very little relation between the three. GRT: Gross Register Tons – A measurement of the total internal volume of a vessel in register tons, equivalent to 100 cubic feet. NRT: Net Register Tons – A measurement of the volume of a vessel that could concievably hold cargo, measured in the same units.

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Which space S are exempt when measuring gross tonnage?

(1) Space that is between the shelter deck and the uppermost complete deck and that is under cover (sheltered) but open to the weather is exempt from tonnage when all openings in the uppermost complete deck are provided with a watertight means of closing.

What is net tonnage of a ship?

Net tonnage (often abbreviated as NT, N.T. or nt) is a dimensionless index calculated from the total moulded volume of the ship’s cargo spaces by using a mathematical formula. Net tonnage is used to calculate the port duties and should not be taken as less than 30 per cent of the ship’s gross tonnage.

What is the difference between gross tonnage and deadweight?

Deadweight Tonnage: expresses the number of tons of 2,240 pounds that a vessel can transport of cargo, stores, and bunker fuel. Gross Tonnage: applies to vessels, not to cargo. It is determined by dividing by 100 the contents, in cubic feet, of the vessel’s closed-in spaces. A vessel ton is 100 cubic feet.

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What is sea margin in ship?

marine. A provision for an increased resistance caused by wind, sea state, fouling of hull and propeller, shallow water, currents, etc. Usually a sea margin of 10-25\% is applied.

What is engine load diagram?

Standard Engine Load Diagram Definitions The load diagram (Fig. 2) defines the power and speed limits for the continuous as well as overload operation of an installed engine, which has a specified MCR point M that conforms to the ship’s specification.

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