PART 1Dark smoke – permitted periods for emissions from vessels
Dark smoke – emissions from vessels2
1
Emissions of dark smoke from a chimney of a vessel for not longer than the period specified in column 2 of Schedule 1 to these Regulations, in respect of the class of case specified in column 1 of that Schedule, are emissions to which section 1 (prohibition of dark smoke from chimneys) does not apply, provided that—
a
continuous emissions of dark smoke caused otherwise than by the soot blowing of a water tube boiler do not exceed—
i
in the case of classes 1 and 2, 4 minutes;
ii
in the case of natural draught oil-fired boiler furnaces in class 4, 10 minutes; and
b
in no case is black smoke emitted for more than 3 minutes in total in any period of 30 minutes.
2
3
For the purposes of Schedule 1, a vessel is not under way when it is at anchor or made fast to the shore or bottom, and a vessel which is aground is deemed to be under way.