542 



(16) "Clean ballast" means the ballast in a tank which since oil was 

 last carried therein, has been so cleaned that effluent therefrom if it 

 were discharged from a ship which is stationary into clean calm water 

 on a clear day would not produce visible traces of oil on the surface 

 of the water or on adjoining shore lines or cause a sludge or emulsion 

 to be deposited beneath the surface of the water or upon adjoining 

 shore lines. If the ballast is discharged through an oil discharge mon- 

 itoring and control system approved by the Administration, evidence 

 based on such a system to the effect that the oil content of the effluent 

 did not exceed 15 parts per million shall be determinative that the 

 ballast was clean, notwithstanding the presence of visible traces. 



(17) "Segregated ballast" means the ballast water introduced into 

 a tank which is completely separated from the cargo oil and oil fuel 

 system and which is permanently allocated to the carriage of ballast 

 or to the carriage of ballast or cargoes other than oil or noxious sub- 

 stances as variously defined in the Annexes of the present Conven- 

 tion. 



(18) "Length" (L) means 96 per cent of the total length on a water- 

 line at 85 per cent of the least moulded depth measured from the top 

 of the keel, or the length from the fore side of the stem to the axis of 

 the rudder stock on that waterline, if that be greater. In ships de- 

 signed with a rake of keel the waterline on which this length is meas- 

 ured shall be parallel to the designed waterline. The length (L) shall 

 be measured in metres. 



(19) "Forward and after perpendiculars" shall be taken at the for- 

 ward and after ends of the length (L). The forward perpendicular 

 shall coincide with the foreside of the stem on the waterline on which 

 the length is measured. 



(20) "Amidships" is at the middle of the length (L). 



(21) "Breadth" (B) means the maximum breadth of the ship, meas- 

 ured 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. The breadth (B) shall be measured in metres. 



(22) "Deadweight" (DW) means the difference in metric tons be- 

 tween the displacement of a ship in water of a specific gravity of 1.025 

 at the load water line corresponding to the assigned summer free- 

 board and the lightweight of the ship. 



(23) "Lightweight" means the displacement of a ship in metric tons 

 without cargo, oil fuel, lubricating oil, ballast water, fresh water and 

 feedwater in tanks, consumable stores, passengers and their effects. 



(24) "Permeability" of a space means the ratio of the volume with- 

 in that space which is assumed to be occupied by water to the total 

 volume of that space. 



(25) "Volumes" and "areas" in a ship shall be calculated in all cases 

 to moulded lines. 



' REGULATION 2 



Application 



(1) Unless expressly provided otherwise, the provisions of this 

 Annex shall apply to all ships. 



(2) In ships other than oil tankers fitted with cargo spaces which 

 are constructed and utilized to carry out in bulk of an aggregate 

 capacity of 200 cubic metres or more, the requirements of Regulations 

 9, 10, 14, 15(1), (2) and (3), 18, 20 and 24(4) of this Annex for oil 



