1 Every ship constructed
before 1 July 1986 shall be provided with a pumping and piping arrangement
to ensure that each tank certified for the carriage of substances
in Category X or Y does not retain a quantity of residue in excess
of 300 litres in the tank and its associated piping and that each
tank certified for the carriage of substances in Category Z does not
retain a quantity of residue in excess of 900 litres in the tank and
its associated piping. A performance test shall be carried out in
accordance with appendix 5 of
this Annex.
2 Every ship constructed
on or after 1 July 1986 but before 1 January 2007 shall be provided
with a pumping and piping arrangement to ensure that each tank certified
for the carriage of substances in Category X or Y does not retain
a quantity of residue in excess of 100 litres in the tank and its
associated piping and that each tank certified for the carriage of
substances in Category Z does not retain a quantity of residue in
excess of 300 litres in the tank and its associated piping. A performance
test shall be carried out in accordance with appendix 5 of this Annex.
3 Every ship constructed
on or after 1 January 2007 shall be provided with a pumping and piping
arrangement to ensure that each tank certified for the carriage of
substances in Category X, Y or Z does not retain a quantity of residue
in excess of 75 litres in the tank and its associated piping. A performance
test shall be carried out in accordance with appendix 5 of this Annex.
4 For a ship other
than a chemical tanker constructed before 1 January 2007 which cannot
meet the requirements for the pumping and piping arrangements for
substances in Category Z referred to in paragraphs 1 and 2 of this
regulation no quantity requirement shall apply. Compliance is deemed
to be reached if the tank is emptied to the most practicable extent.
5 Pumping performance
tests referred to in paragraphs 1, 2 and 3 of this regulation shall
be approved by the Administration. Pumping performance tests shall
use water as the test medium.
6 Ships certified
to carry substances of Category X, Y or Z shall have an underwater
discharge outlet (or outlets).
7 For ships constructed
before 1 January 2007 and certified to carry substances in Category
Z an underwater discharge outlet as required under paragraph 6 of
this regulation is not mandatory.
8 The underwater discharge
outlet (or outlets) shall be located within the cargo area in the
vicinity of the turn of the bilge and shall be so arranged as to avoid
the re-intake of residue/water mixtures by the ship’s seawater
intakes.
9 The underwater discharge
outlet arrangement shall be such that the residue/water mixture discharged
into the sea will not pass through the ship’s boundary layer.
To this end, when the discharge is made normal to the ship’s
shell plating, the minimum diameter of the discharge outlet is governed
by the following equation:
where:
|
d |
= |
minimum diameter
of the discharge outlet (m) |
|
Ld
|
= |
distance
from the forward perpendicular to the discharge outlet (m) |
|
Qd
|
= |
the
maximum rate selected at which the ship may discharge a residue/water
mixture through the outlet (m3/h).
|
10 When the discharge
is directed at an angle to the ship’s shell plating, the above
relationship shall be modified by substituting for Qd the
component of Qd which is normal to the ship’s shell
plating.
11
Slop tanks
Although this Annex does not require the fitting of dedicated
slop tanks, slop tanks may be needed for certain washing procedures.
Cargo tanks may be used as slop tanks.