Fee: €25 million
Fee: €25 million
The Single Decker of general cargo vessel is a flexible design of vessel which will go anywhere and carry a wide variety of cargo. The cargo may be break bulk or containers. (SOLAS, CHAPTER II-1, Part B) The vessel to be built with a single screw, diesel engine general cargo ship having a continuous freeboard deck, forecastle, poop, bulbous stern and bulbous bow. Above poop deck there are four tiers of deckhouse. It’s to have double bottom and top side tank in way of cargo area. Double bottom tank and side tank may be used for ballast water tank and light oil tank. Such vessels have several large clear open cargo-carrying spaces or holds. One or more decks may be present within the holds. (SOLAS, CHAPTER II-1, Part B) These are known as ’tween decks and provide increased flexibility in loading and unloading, permit cargo segregation and improved stability. (SOLAS, CHAPTER II-1, Part A-1, Reg 5) Access to the holds is by openings in the deck known as hatches. Hatches are made as large as strength considerations permit in order to reduce the amount of horizontal movement of cargo within the ship. Typically the hatch width is about a third of the ship’s beam. Hatch covers are of various types. Pontoon hatches are quite common in ships of up to 10 000 dwt, for the upper deck and ’tween decks, each pontoon weighing up to 25 tonnes. A pontoon hatches a used as grain bulkheads. They are opened and closed using a gantry or cranes. (SOLAS, CHAPTER II-1, Part A-1, Reg 3-6) In large bulk carriers side rolling hatch covers are often fitted, opening and closing by movement in the transverse direction. Another type of cover is the folding design operated by hydraulics.
The machinery spaces are often well aft but there is usually one hold aft of the accommodation and machinery space to improve the trim of the vessel when partially loaded. General cargo ships are generally smaller than the ships devoted to the carriage of bulk cargos. (SOLAS, CHAPTER II-1, Part C, Reg 27) The engine room on a vessel is usually near the stern, under the house and above the fuel tanks. Larger of the Single Decker, from Handymax up, have a two-stroke diesel engine which directly moves a single propeller. An alternator is coupled directly with the propeller shaft, and an auxiliary generator is used. On the smallest bulkers, one or two four-stroke diesels are used, and coupled with the propeller via a gear box. The average design ship speed for Single Decker of Handysize and above is between 9.5 and 12 knots (21 km/h). The propeller speed is relatively low, at about 2190 KW or 250 revolutions per minute. Propeller is AU type 5 blades, diameter 3.616m, disk area ratio 0.50, and pitch ratio 0.71, material Cu3 Ni-Al-Bronze.
Figure 7: Main Engine
The Cargo vessel is a damage stability to calculate according to the requirement of (SOLAS, CHAPTER II-1, Part B-1). The ingress water in damage area carrying fuel oil, fresh water and ballast water or cargo oil to be sea water (density = 1.025) in all damage condition. Damage stability criterion is as following:
1) Final waterline considering immersion, heel, trim shall happen below any edge of opening lower.
2) On immersion final stage, heeling angle by non-symmetry immersion shall be less than 15o, but if deck edge haven submersion appearance, the angle can be increased to 17o
3) Restoring lever curve at scope outside of the equilibrium shall be more than 200, max. Remainder restoring lever in 20o scope is higher than 0.1m and area of the curve at this scope is more than 0.0175 mm rad, in this condition, the stability to meet the requirement.
After the calculation of light weight and height of gravity center from the results of inclining test, checking computation of the damage stability at 6000t operating condition to be performed.