Appendix I - List of Changes when Applying the Specifications to New Crude Oil Tankers of 20,000 Tons Deadweight and Above
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Statutory Documents - IMO Publications and Documents - Specifications and Manuals - Crude Oil Washing Systems - Revised Specifications for the design, operation and control of crude oil washing systemsResolution A.446(XI) Amended by Resolution A.497(XII) Amended by Resolution A.897(21) - Appendix I - List of Changes when Applying the Specifications to New Crude Oil Tankers of 20,000 Tons Deadweight and Above

Appendix I - List of Changes when Applying the Specifications to New Crude Oil Tankers of 20,000 Tons Deadweight and Above

  4.2.10 Subparagraph (c) is not applicable.

  6.1 Replace by the following:

  • 6.1 Tankage to be crude oil washed

  • 6.1.1 Before departure on a ballast voyage:

    • (a) Approximately one quarter of the cargo tanks shall be crude oil washed for sludge control purposes on a rotational basis and in accordance with the procedures specified in the Operations and Equipment Manual. However, for these purposes, no tank need be crude oil washed more than once in every four months; and

    • (b) If it is considered that additional ballast in a cargo tank or tanks may be required during the ballast voyage under the conditions and provisions specified in Regulation 13(3) of Annex I of MARPOL 73/78, the tank or tanks which may be used for this ballast shall be crude oil washed in accordance with the procedures specified in the Operations and Equipment Manual.

  • 6.1.2 Ballast water shall not be put into cargo tanks that have not been crude oil washed. Water that is put into a tank which has been crude oil washed but not water rinsed shall be regarded as dirty ballast.

  • 6.1.3 Crude oil washing shall not be conducted between the final discharge and loading ports; that is to say, no crude oil washing shall be undertaken during the ballast voyage.

  6.3 Replace by the following:

  • 6.3 Ballasting of cargo tanks

  • Care shall be taken at the completion of crude oil washing of any cargo tank that might contain ballast to strip the tank as completely as possible. Where this ballast is filled through cargo lines and pumps, these must be drained and stripped of oil using the means required by 4.4.5.

  6.4 The last two sentences are not applicable.

  6.5 Replace by the following:

  • 6.5 Discharge of oily water effluents on ballast voyage

  • The discharge of additional ballast from cargo tanks and any other water effluent discharged during the ballast voyage shall comply with the requirements of Regulation 9 of Annex I of MARPOL 73/78.

  6.8 This paragraph is not applicable.

  7(d) Replace by the following:

  7(d) Details of the requirements of section 6 of these Specifications together with advice and instructions, where appropriate, in meeting these requirements such as:

  • (i) Recommended methods and programmes of crude oil washing in order to accord with all foreseeable circumstances of cargo discharge restraints and to obtain maximum trim during the completion of washing and draining of each tank.

  • (ii) The method of draining tanks which shall include information on optimum trim conditions as required by 4.4.10.

  • (iii) The method of draining cargo pumps, cargo lines, crude oil washing lines and stripping lines, and spaces into which they may be drained, together with the final discharge ashore via the small discharge line on completion of discharge.

  • (iv) Typical washing programmes under various conditions of loading specifying:

    • (1) The tanks to be washed in accordance with 6.1;

    • (2) The method for washing each tank, that is, single- or multi-stage;

    • (3) The number of tank washing machines to be used simultaneously;

    • (4) The duration of the crude oil wash and water rinse where the latter is appropriate.

  • (v) The procedure for verifying by sound patterns that bottom mounted machines are operating shall be carried out towards the end of the wash cycle for each tank. When carrying out such verification all other machines shall be shut down if necessary.

Parent topic: Revised Specifications for the design, operation and control of crude oil washing systemsResolution A.446(XI) Amended by Resolution A.497(XII) Amended by Resolution A.897(21)
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