|
INDEX OF SECTIONS
1 Main features of MARPOL 73/78, Annex II
2 Description of the ship's equipment and arrangements
3 Cargo unloading procedures and tank stripping
4 Procedures relating to the cleaning of cargo tanks, the discharge of residues, ballasting and deballasting
5 Information and Procedures
SECTION 1 Main features of MARPOL 73/78, Annex II
1.1 The requirements of Annex II apply to all ships carrying Noxious Liquid Substances in bulk. Substances posing a threat of harm to the marine environment are divided into three categories, X, Y and Z. Category X substances are those posing the greatest threat to the marine environment, whilst Category Z substances are those posing the smallest threat.
1.2 Annex II prohibits the discharge into the sea of any effluent containing substances falling under these categories, except when the discharge is made under conditions which are specified in detail for each Category. These conditions include, where applicable, such parameters as:
.1 the maximum quantity of substances per tank which may be discharged into the sea;
.2 the speed of the ship during the discharge;
.3 the minimum distance from the nearest land during discharge;
.4 the minimum depth of water at sea during discharge; and
.5 the need to effect the discharge below the waterline.
1.3 For certain sea areas identified as "special area" more stringent discharge criteria apply. Under Annex II the special area is the Antarctic area.
1.4 Annex II requires that every ship is provided with pumping and piping arrangements to ensure that each tank designated for the carriage of Category X, Y and Z substances does not retain after unloading a quantity of residue in excess of the quantity given in the Annex. For each tank intended for the carriage of such substances an assessment of the residue quantity has to be made. Only when the residue quantity as assessed is less than the quantity prescribed by the Annex a tank may be approved for the carriage of a Category X, Y or Z substances.
1.5 In addition to the conditions referred to above, an important requirement contained in Annex II is that the discharge operations of certain cargo residues and certain tank cleaning and ventilation operations may only be carried out in accordance with approved procedures and arrangements.
1.6 To enable the requirement of paragraph 1.5 to be met, this Manual contains in section 2 all particulars of the ship's equipment and arrangements, in section 3 operational procedures for cargo unloading and tank stripping and in section 4 procedures for discharge of cargo residues, tank washing, slops collection, ballasting and deballasting as may be applicable to the substances the ship is certified to carry.
1.7 By following the procedures as set out in this Manual, it will be ensured that the ship complies with all relevant requirements of Annex II to MARPOL 73/78.
SECTION 2 Description of the ship's equipment and arrangements
2.1 This section contains all particulars of the ship's equipment and arrangements necessary to enable the crew to follow the operational procedures set out in sections 3 and 4.
2.2 General arrangement of ship and description of cargo tanks
This section shall contain a brief description of the cargo area of the ship with the main features of the cargo tanks and their positions.
Line or schematic drawings showing the general arrangement of the ship and indicating the position and numbering of the cargo tanks and heating arrangements shall be included.
2.3 Description of cargo pumping and piping arrangements and stripping system
This section shall contain a description of the cargo pumping and piping arrangements and of the stripping system. Line or schematic drawings shall be provided showing the following and be supported by textual explanation where necessary:
.1 cargo piping arrangements with diameters;
.2 cargo pumping arrangements with pump capacities;
.3 piping arrangements of stripping system with diameters;
.4 pumping arrangements of stripping system with pump capacities;
.5 location of suction points of cargo lines and stripping lines inside every cargo tank;
.6 if a suction well is fitted, the location and cubic capacity thereof;
.7 line draining and stripping or blowing arrangements; and
.8 quantity and pressure of nitrogen or air required for line blowing if applicable.
2.4 Description of ballast tanks and ballast pumping and piping arrangements
This section shall contain a description of the ballast tanks and ballast pumping and piping arrangements.
Line or schematic drawings and tables shall be provided showing the following:
.1 a general arrangement showing the segregated ballast tanks and cargo tanks to be used as ballast tanks together with their capacities (cubic metres);
.2 ballast piping arrangement;
.3 pumping capacity for those cargo tanks which may also be used as ballast tanks; and
.4 any interconnection between the ballast piping arrangements and the underwater outlet system.
2.5 Description of dedicated slop tanks with associated pumping and piping arrangements
This section shall contain a description of the dedicated slop tank(s), if any, with the associated pumping and piping arrangements. Line or schematic drawings shall be provided showing the following:
.1 which dedicated slop tanks are provided together with the capacities of such tanks;
.2 pumping and piping arrangements of dedicated slop tanks with piping diameters and their connection with the underwater discharge outlet.
2.6 Description of underwater discharge outlet for effluents containing Noxious Liquid Substances
This section shall contain information on position and maximum flow capacity of the underwater discharge outlet (or outlets) and the connections to this outlet from the cargo tanks and slop tanks. Line or schematic drawings shall be provided showing the following:
.1 location and number of underwater discharge outlets;
.2 connections to underwater discharge outlet;
.3 location of all seawater intakes in relation to underwater discharge outlets.
2.7 Description of flow rate indicating and recording devices
Deleted
2.8 Description of cargo tank ventilation system
This section shall contain a description of the cargo tank ventilation system.
Line or schematic drawings and tables shall be provided showing the following and supported by textual explanation if necessary:
.1 the Noxious Liquid Substances the ship is certified fit to carry having a vapour pressure over 5 kPa at 20℃ suitable for cleaning by ventilation to be listed in paragraph 4.4.10 of the Manual;
.2 ventilation piping and fans;
.3 position of the ventilation openings;
.4 the minimum flow rate of the ventilation system to adequately ventilate the bottom and all parts of the cargo tank;
.5 the location of structures inside the tank affecting ventilation;
.6 the method of ventilating the cargo pipeline system, pumps, filters, etc; and
.7 means for ensuring that the tank is dry.
2.9 Description of tank washing arrangements and wash water heating system
This section shall contain a description of the cargo tank washing arrangements, wash water heating system and all necessary tank washing equipment.
Line or schematic drawings and tables or charts showing the following:
.1 arrangements of piping dedicated for tank washing with pipeline diameters;
.2 type of tank cleaning machines with capacities and pressure rating;
.3 maximum number of tank cleaning machines which can operate simultaneously;
.4 position of deck openings for cargo tank washing;
.5 the number of cleaning machines and their location required for ensuring complete coverage of the cargo tank walls;
.6 maximum capacity of wash water which can be heated to 60℃ by the installed heating equipment; and
.7 maximum number of tank cleaning machines which can be operated simultaneously at 60℃.
SECTION 3 Cargo unloading procedures and tank stripping
3.1 This section contains operational procedures in respect of cargo unloading and tank stripping which must be followed in order to ensure compliance with the requirements of Annex II.
3.2 Cargo unloading
This section shall contain procedures to be followed including the pump and cargo unloading and suction line to be used for each tank. Alternative methods may be given.
The method of operation of the pump or pumps and the sequence of operation of all valves shall be given.
The basic requirement is to unload the cargo to the maximum extent.
3.3 Cargo tank stripping
This section shall contain procedures to be followed during the stripping of each cargo tank.
The procedures shall include the following:
.1 operation of stripping system;
.2 list and trim requirements;
.3 line draining and stripping or blowing arrangements if applicable; and
.4 duration of the stripping time of the water test.
3.4 Cargo temperature
This section shall contain information on the heating requirements of cargoes which have been identified as being required to be at a certain minimum temperature during unloading.
Information shall be given on control of the heating system and the method of temperature measurement.
3.5 Procedures to be followed when a cargo tank cannot be unloaded in accordance with the required procedures
This section shall contain information on the procedures to be followed in the event that the requirements contained in sections 3.3 and/or 3.4 cannot be met due to circumstances such as the following:
.1 failure of cargo tank stripping system; and
.2 failure of cargo tank heating system.
3.6 Cargo Record Book
The Cargo Record Book shall be completed in the appropriate places on completion of any cargo operation.
|
