|
SECTION 4 Procedures relating to the cleaning of cargo tanks, the discharge of residues, ballasting and deballasting
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.
4.3 Deleted
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:
.1 Category of substance
The Category of the substance should be obtained from the relevant Certificate.
.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).
.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 Antarctic area (the sea area south of latitude 60°S).
.4 Solidifying or High-Viscosity Substance
The properties of the substance should be obtained from the shipping document.
.5 Miscibility with water
Deleted
.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.
.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.
.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.
.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).
.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.
SECTION 5 Information and procedures
This section shall contain procedures, which will depend on the age of the ship and pumping efficiency. Examples of flow diagram referred to in this section are given at addendum A and incorporate comprehensive requirements applicable to both new and existing ships. The Manual for a particular ship shall only contain those requirements specifically applicable to that ship.
Information relating to melting point and viscosity, for those substances which have a melting point equal to or greater than 0℃ or a viscosity equal or greater than 50 mPa.s at 20℃, shall be obtained from the shipping document.
For substances allowed to be carried, reference is made to the relevant Certificate.
The Manual shall contain:
Table 1 : Deleted
Table 2 : Cargo tank information.
Addendum A : Flow diagram.
Addendum B : Prewash procedures.
Addendum C : Ventilation procedures.
Addendum D :
Additional information and operational instructions when required or accepted by the Administration.
Outlines of the above table and addenda are shown below.
Table 2 - Cargo tank information
* See the latest edition of MEPC.2 circular (issued annually in December).
|
