s. s. 18 18 (i) where the ship is self-propelled, at least 7 knots; or (ii) where the ship is not self-propelled, at least 4 knots; and (e) the procedures and arrangements for the discharge have been approved by a prescribed officer, being procedures and arrangements that ensure that the concentration and rate of discharge of the effluent is such that the concentration of the substance in Category B in the wake astern of the ship does not exceed 1 part in 1 000 000 parts; and (f) the maximum quantity of cargo discharged from each tank of the ship (including the associated piping system of the tank) does not exceed the maximum quantity specified in the procedures referred to in paragraph (e), not being a quantity exceeding 1 cubic metre or 1 part in 3000 parts of the tank capacity in cubic metres, whichever is the greater; and (g) the discharge is made below the water line of the ship, taking into account the location of the sea-water intakes; and (h) the discharge is made when the ship is at a distance of not less than 12 nautical miles from the nearest land and in a depth of water of not less than 25 metres. (7) Without limiting the generality of subsection (2), (6) or (12) but subject to subsection (13), where— S. 18(7)(a) (a) the tank of a ship that held— amended by No. 46/1991 (i) a substance in Category B; or s. 10(2)(d).
(i) where the ship is self-propelled, at least 7 knots; or (ii) where the ship is not self-propelled, at least 4 knots; and s. 18 (e) the procedures and arrangements for the discharge have been approved by a prescribed officer, being procedures and arrangements that ensure that the concentration and rate of discharge of the effluent is such that the concentration of the substance in Category B in the wake astern of the ship does not exceed 1 part in 1 000 000 parts; and (f) the maximum quantity of cargo discharged from each tank of the ship (including the associated piping system of the tank) does not exceed the maximum quantity specified in the procedures referred to in paragraph (e), not being a quantity exceeding 1 cubic metre or 1 part in 3000 parts of the tank capacity in cubic metres, whichever is the greater; and (g) the discharge is made below the water line of the ship, taking into account the location of the sea-water intakes; and (h) the discharge is made when the ship is at a distance of not less than 12 nautical miles from the nearest land and in a depth of water of not less than 25 metres. (7) Without limiting the generality of subsection (2), (6) or (12) but subject to subsection (13), where— s. 18 S. 18(7)(a) amended by No. 46/1991 s. 10(2)(d). (a) the tank of a ship that held— (i) a substance in Category B; or
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