4.1 General
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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 - 4 Oil Outflow Analysis - 4.1 General

4.1 General

  4.1.1 The oil pollution prevention performance of a tanker design is expressed by a non-dimensional oil pollution prevention index E which is a function of the three oil outflow parameters: “probability of zero oil outflow”, “mean oil outflow” and “extreme oil outflow”. The oil outflow parameters should be calculated for all conceivable damage cases within the entire envelope of damage conditions as detailed in section 5.

  4.1.2 The three oil outflow parameters are defined as follows:

  • .1 Probability of zero oil outflow. This parameter represents the probability that no cargo oil will escape from the tanker in case of collision or stranding. If, e.g., the parameter equals 0.6, in 60% of all collision or stranding accidents no oil outflow is expected to occur.

  • .2 Mean oil outflow parameter. The mean oil outflow represents the sum of all outflow volumes multiplied by their respective probabilities. The mean oil outflow parameter is expressed as a fraction of the total cargo oil capacity at 98% tank filling.

  • .3 Extreme oil outflow parameter. The extreme oil outflow is calculated - after the volumes of all outflow cases have been arranged in ascending order - as the sum of the outflow volumes between 0.9 and 1.0 cumulative probability, multiplied by their respective probabilities. The value so derived is multiplied by 10. The extreme oil outflow parameter is expressed as a fraction of the total cargo oil capacity at 98% tank filling.

  4.1.3 In general, consideration of ship’s survivability will not be required for the conceptual approval of an alternative design. This may, however, be required in special cases, depending on special features of the design.

Parent topic: 4 Oil Outflow Analysis
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