Appendix 3 - Model Format for the Procedure for Discharging and Loading Portable Tanks Containing Dangerous Goods Carried as Deck Tanks on Offshore Support Vessels
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Appendix 3 - Model Format for the Procedure for Discharging and Loading Portable Tanks Containing Dangerous Goods Carried as Deck Tanks on Offshore Support Vessels

 1 PURPOSE

1.1 The purpose of this Procedure is to identify the arrangements and equipment required to enable compliance with MARPOL Annex II and the IMDG Code, and to identify for the vessel's officers all operational procedures with respect to cargo handling, tank cleaning, slops handling, ballasting and deballasting which should be followed in order to comply with the requirements of MARPOL Annex II.

1.2 This Procedure covers all marine transportation aspects of the shipment for the products identified in the cargo list of the Certificate of Fitness issued, and in accordance with chapter 16 of the present Code describing the provisions for loading, sea passage, offshore discharge, return voyage and subsequent unloading of those tanks to shore.

1.3 This Procedure should include:

  • .1 a summary giving a description of the intended offshore campaign;

  • .2 related discharge permits from local water jurisdictions;

  • .3 material safety data sheets;

  • .4 sea fastening arrangements and calculations;

  • .5 deck arrangements and pipeline drawing; and

  • .6 portable tank information and details.

2 APPLICATION

This Procedure applies to all personnel on OSVs involved in the handling and discharging or loading of the products listed in the cargo list of the Certificate of Fitness issued, and in accordance with chapter 17 of the present Code. It is intended to be an informative document for those involved in the safe management of the installed deck spread and for the Administration concerned with enforcing safe working practices while these operations are being conducted.

3 REFERENCES, DEFINITIONS AND RESPONSIBILITIES

3.1 References

The proposed operations should be carried out in accordance with the following:

  • .1 International Maritime Dangerous Goods Code (IMDG Code), as amended

    The IMDG Code, as amended, is used as a basis for national regulations in pursuance of their obligation under SOLAS chapter VIII and MARPOL Annex III. Observance of the Code harmonizes the practices and procedures followed in the carriage of dangerous goods by sea and ensures compliance with the mandatory requirements of SOLAS and MARPOL Annex III.

  • .2 Guidelines for the design and construction of offshore supply vessels, 2006

    These Guidelines have been developed for the design and construction of new offshore supply vessels with a view to promoting the safety of such vessels and their personnel, recognizing the unique design features and service characteristics of these vessels.

    The Guidelines furthermore provide a standard of safety equivalent to the relevant requirements of SOLAS, and in particular to the stability criteria of the International Code on Intact Stability, 2008 (2008 IS Code), as amended.

  • .3 International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code)

    The IBC Code was adopted by the Marine Environment Protection Committee of the Organization by resolution MEPC.19(22), as amended, provided that such amendments were adopted and brought into force in accordance with the requirements of article 16 of MARPOL concerning amendment procedures applicable to an appendix to an annex.

  • .4 Code for the Transport and Handling of Hazardous and Noxious Liquid Substances in Bulk on Offshore Support Vessels (OSV Chemical Code)

3.2 Definitions

3.2.1 Dangerous goods are those substances (including mixtures and solutions) and articles subject to the requirements of the IMDG Code assigned to one of the Classes 1-9 according to the hazard or the most predominant of the hazards present.

3.2.2 Marine pollutants are environmentally hazardous substances identified as marine pollutants in the IMDG Code, are considered a threat to marine life, and are carried under the requirements of MARPOL Annex III.

3.3 Responsibilities

3.3.1 The OSV should be in compliance with section 17.3 of the present Code.

3.3.2 Master: The master of the supply vessel involved in the transportation is responsible for all activities carried out on his or her vessel. The master has the authority to stop any operation he or she considers to be unsafe, that puts personnel or the vessel at risk or that could pollute the environment.

3.3.3 Specialist operator: The specialist operator, if required, will be the person/contractor responsible for the cargo transfer operations with regards to the deck spread. He or she will be additional to the normal vessel crew, and directly responsible to the master.

4 DESCRIPTION OF THE DECK SPREAD EQUIPMENT AND ARRANGEMENTS

4.1 General arrangements of deck spread

4.1.1 This should contain a brief description of the cargo deck area of the vessel with the main features of the portable tanks and their positions on the deck taking into consideration the definition of "cargo area" in 1.2.7 of the present Code.

4.1.2 A brief description of the physical arrangements for the securing of the portable tanks, pipelines and other equipment to the deck of the vessel should also contain details of deck protection systems, etc.

4.1.3 Description of deck spread pumping and piping arrangements

This section should contain a description of the pumping and piping arrangements. Line or schematic drawings should be provided showing the following and be supported by textual explanation where necessary:

  • .1 cargo piping arrangements with diameters;

  • .2 cargo piping arrangements that cross-connect to the vessel's bulk tanks;

  • .3 cargo pumping arrangements with pump capacities;

  • .4 location of suction points of cargo lines and valve position for every portable tank;

  • .5 stripping or blowing back arrangements;

  • .6 quantity and pressure of nitrogen or carbon dioxide required for line blowing and inerting if applicable; and

  • .7 tank ventilation arrangements and position of vent outlets, etc.

4.1.4 Description of the portable tank ventilation systems

This section should contain a description of the portable tank ventilation system and details to prevent accumulation of vapours on the deck area, based on the properties of the tank contents.

4.1.5 Description of securing arrangements of tanks and pipelines

This section should contain a description of securing arrangements of tanks and pipelines.

4.2 Discharging and loading operations for portable tanks

This section should contain a description of and operational procedures for the loading and discharging of the portable tank while on board the vessel and they are supported by text regarding the following:

  • .1 inerting systems if required when carrying low-flashpoint products;

  • .2 suitable fire-fighting media determined to be effective for the substance being carried will be provided and available for immediate use during the transfer operation;

  • .3 spillage clean up material specific to the substance, if required, is available in the event of an incident;

  • .4 personal protective equipment, if required, will be provided for the operator loading the portable tank; this will be worn at all times, by those involved, during cargo handling operations; equipment supplied should be in addition to equipment required when carrying dangerous goods; and

  • .5 emergency procedures in the event of an incident.

4.3 Additional operational information

This section should contain additional details and a description of the operational procedures involved when the deck spread is in operation and should cover the following points:

  • .1 procedures to be followed in the event of a spillage and the disposal of the clean-up material;

  • .2 details of the blowback system and whether the residues are to be blown to the installation or to the tanks on deck;

  • .3 details of the process that will be carried out on board when the deck spread is in operation;

  • .4 emergency shut-down procedures for the deck spread; and

  • .5 details of the hose coupling arrangements to the installation and method of quick release.

Attachments:

The following attachments should be prepared:

  • 1. summary covering description of intended offshore campaign;

  • 2. related discharge permits from local water jurisdictions;

  • 3. material safety data sheets;

  • 4. sea fastening arrangements and calculations;

  • 5. deck arrangements and pipeline drawing; and

  • 6. portable tank information and details.

Parent topic: OSV Chemical Code - Code for the Transport and Handling of Hazardous and Noxious Liquid Substances in Bulk on Offshore Support Vessels
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