1 General
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Marine Environment Protection Committee - Resolution MEPC.110(49) - Revised Interim Guidelines for the Approval of Alternative Methods of Design and Construction of Oil Tankers Under Regulation 13F(5) of Annex I of MARPOL 73/78 - (adopted on 18 July 2003) - Annex - Revised Interim Guidelines for the Approval of Alternative Methods of Design and Construction of Oil Tankers Under Regulation 13F(5) of Annex I Of MARPOL 73/78 - Appendix - Example for the Application of the Revised Interim Guidelines - 1 General

1 General

  1.1 The application of the Revised Interim Guidelines, hereunder referred to as “the Guidelines”, is shown in the following worked example illustrating the calculation procedure of the oil outflow parameters for a tank barge. For presentation purposes, a simplified hull form and level of compartmentation have been assumed. The procedures described herein are readily adaptable as a computer application, which will be necessary as more complicated arrangements are evaluated. This example is evaluated in accordance with the requirements for “concept approval”. Additional requirements for a shipyard design approval are noted where applicable.

  1.2 An application of the Guidelines will typically follow these seven basic steps:

  • .1 Vessel design: In accordance with paragraph 3.1 of the Guidelines, the vessel is designed to meet all applicable regulations of MARPOL Annex I.

  • .2 Establishing of the full load condition: In accordance with paragraph 5.1.5 of the Guidelines, a full load condition is developed.

  • .3 Assembling of the damage cases: By applying the damage density distribution functions provided in the Guidelines, determine each unique grouping of damaged compartments and the probability associated with that damage condition. Independent sets of damage cases are derived for side (collision) and bottom (stranding) damage.

  • .4 Computation of the equilibrium condition for each damage case: Compute the final equilibrium condition for all side and bottom damage conditions. This step is only required for the final shipyard design, in accordance with paragraph 5.1.5.10 of the Guidelines.

  • .5 Computation of the oil outflow for each damage case: Calculate the oil outflow for each damage case. Separate calculations are done for side damage and for bottom damage at 0.0 m and 2.5 m fall in tide conditions. For side damage, all oil is assumed to escape from damaged tanks. For bottom damage, a hydrostatic balance method is applied. For the final shipyard design, survivability is evaluated in accordance with the requirements of MARPOL regulation I/25(3).

  • .6 Computation of the oil outflow parameters: The cumulative probability of occurrence of each level of oil outflow is developed. This is done for the side damage and for each bottom damage tide condition. The associated oil outflow parameters are then computed. The bottom damage tidal parameters are combined in accordance with paragraph 5.1.3 and the side and bottom damage parameters are then combined in accordance with paragraph 5.1.2 of the Guidelines.

  • .7 Computation of the Pollution Prevention Index E: The new design has satisfactory characteristics if index E, as defined in paragraph 4.2 of the Guidelines, is greater than or equal to 1.0.

Parent topic: Appendix - Example for the Application of the Revised Interim Guidelines
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