4.1 This section contains operational procedures
in respect of tank cleaning, ballast and slops handling which must
be followed in order to ensure compliance with the requirements of Annex II.
4.2 The following paragraphs outline the sequence
of actions to be taken and contain the information essential to ensure
that Noxious Liquid Substances are discharged without posing a threat
of harm to the marine environment.
4.4 The information necessary to establish the
procedures for discharging the residue of the cargo, cleaning, ballasting
and deballasting the tank, shall take into account the following:
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.1
Category of substance
The Category of the substance should be obtained from the relevant
Certificate.
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.2
Stripping efficiency of
tank pumping system
The contents of this section will depend on the design
of the ship and whether it is a new ship or existing ship (See flow
diagram and pumping/stripping requirements).
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.3
Vessel within or outside
Special Area
This section shall contain instructions on whether the
tank washings can be discharged into the sea within a special area
(as defined in section 1.3)
or outside a special area. The different requirements shall be made
clear and will depend on the design and trade of the ship.
No discharges into the sea of residues of Noxious Liquid Substances,
or mixtures containing such substances, are allowed within the polar waters.
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.4
Solidifying or High-Viscosity
Substance
The properties of the substance should be obtained from the
shipping document.
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.5
Persistent floaters with a viscosity equal to or greater than 50 mPaˇs at 20ēC
and/or a melting point equal to or greater than 0ēC
This section should contain instructions on how to deal with tank
washings of substances identified by the presence of '16.2.7' in column 'o' of
chapter 17 of the IBC Code and the latest version of the
MEPC.2/Circular, when operating in the areas specified in regulation 13.9 of Annex
II.
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.6
Compatibility with slops
containing other substances
This section shall contain instructions on the permissible
and non-permissible mixing of cargo slops. Reference should be made
to compatibility guides.
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.7
Discharge to reception facility
This section shall identify those substances the residues
of which are required to be prewashed and discharged to a reception
facility.
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.8
Discharging into the sea
This section shall contain information on the factors
to be considered in order to identify whether the residue/water mixtures
are permitted to be discharged into the sea.
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.9
Use of cleaning agents or
additives
This section shall contain information on the use and
disposal of cleaning agents (e.g. solvents used for tank cleaning)
and additives to tank washing water (e.g. detergents).
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.10
Use of ventilation procedures
for tank cleaning
This section shall make reference to all substances suitable
for the use of ventilation procedures.
4.5 Having assessed the above information, the
correct operational procedures to be followed should be identified
using the instructions and flow diagram of section 5. Appropriate entries
shall be made in the Cargo Record Book indicating the procedure adopted.