Section 3 Definitions

301. Application

Unless expressly provided otherwise, the definitions and symbols used in the Rules are to be in ac- cordance with Sec 3.

302. Dredger

Dredger is a vessel equipped with the dredging equipment for soils, sands, pebbles and stones at

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the bottom of river, harbor, and sea lanes.

303. Non self-propelled dredger

A non self-propelled dredger is a dredger which is not equipped with propulsion system.

304. Length

Length(Ä ) is the distance in meters, measured on the load line as prescribed in 307. from the in- ner side of the stem plating to the inner side of the stern plating. However, in dredgers with hull form of ship type, this length is the distance in meters, measured on the load line as prescribed in

307. from the fore side of the stem to the after side of the rudder post in case of a dredger with rudder post, or to the axis of the rudder stock in case of a dredger without rudder post.

305. Breadth

Breadth(A ) is the horizontal distance in meters, measured between the inner sides of the side plat- ing at the broadest part of the hull.

306. Depth

Depth(Ǽ) is the vertical distance in meters at the middle point of Ä, measured from the top of the keel to the lower side of the upper deck plating at the side of the vessel.

307. Load Line

Load Line is the waterline corresponding to the designed summer load draught in case of a dredger which is required to be marked with load lines, and the waterline corresponding to the designed maximum draught in case of a dredger which is not to be marked with load lines.

308. Load draught

Load draught(Ẁ) is the vertical distance in meters, measured from the top of the keel to the load line at the middle of the Ä .

309. Upper deck

Upper deck is the uppermost continuos deck.

310. Superstructure

The superstructure is a decked structure on the upper deck extending from side to side of the dredger or having its side wall at the position not more than 0.04 A from the side shell plating.

311. Midship

The midship is the part covering 0.4 Ä amidships. However, it means 0.6 Ä amidships in the pon- toon type or similar shape of dredgers.

312. Fore and aft end part

Fore and aft end means the part covering 0.1 Ä from the fore and aft end of the ship.

313. Strengthened bottom forward

The strengthened bottom forward part is the flat area forward the point of 0.15 Ä from the fore end.

314. Essential installation

Essential installation is an installation which has relation to the safety of life or of dredger.

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315. Truss

Truss is a structure connecting the deck and the bottom structure with pillar and diagonal, and sus- taining the deck loads effectively.