Section 12A(3) in The Merchant Shipping (Prevention of Pollution by Oil from Ships) Rules, 2010
(3)For the purpose of this rule, the following definitions shall be applicable, namely:(a)"Oil fuel" means any oil used as fuel oil in connection with the propulsion and auxiliary machinery of the ship in which such oil is carried;(b)"Load line draught (ds)" is the vertical distance, in metres, from the moulded baseline at mid-length to the waterline corresponding to the summer freeboard draught to be assigned to the ship;(c)"Light ship draught" is the moulded draught amidships corresponding to the lightweight;(d)"Partial load line draught (dp)" is the light ship draught plus 60% of the difference between the light ship draught and the load line draught (ds) and the partial load line draught (dp) shall be measured in metres;(e)"Waterline (ds)" is the vertical distance, in metres, from the moulded baseline at mid-length to the waterline corresponding to 30% of the depth ds;(f)"Breadth (Bs)" is the greatest moulded breadth of the ship, in metres, at or below the deepest load line draught (ds);(g)"Breadth (BB)" is the greatest moulded breadth of the ship, in metres, at or below the waterline (dB);(h)"Depth (Ds)" is the moulded depth, in metres, measured at mid-length to the upper deck at side and for the purpose of the application, "upper deck" means the highest deck to which the watertight transverse bulkheads except aft peak bulkheads extend,(i)"Length (L)" means 96% of the total length on a waterline at 85% of the least moulded depth measured from the top of the keel, or the length from the foreside of the stem to the axis of the rudder stock on' that waterline, if that be greater and in ships designed with a rake of keel the waterline on which this length is measured, it shall be parallel to the designed waterline and the length (L) shall be measured in metres;(j)"Breadth (B)" means the maximum breadth of the ship, in metres, measured amidships to the moulded line of the frame in a ship with a metal shell and to the outer surface of the hull in a ship with a shell of any other material;(k)"Oil fuel tank" means a tank in which oil fuel is carried, but excludes those tanks which would not contain oil fuel in normal operation, such as overflow tanks;(l)"Small oil fuel tank" is an oil fuel tank with a maximum individual capacity not greater than 30 m3;(m)"C" is the ship's total volume of oil fuel, including that of the small oil fuel tanks, in m3; at 98% tank filling;(n)"Oil fuel capacity" means the volume of a tank in m3 ,98% filling,
