5 Procedure for calculating the travel time T
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1238 – Guidelines for Evacuation Analysis for New and Existing Passenger Ships – (30 October 2007) - Annex 2 - Guidelines for an Advanced Evacuation Analysis of New and Existing Passenger Ships1 - Appendix - Method to Determine the Travel Time (T) by Simulation Tools for the Advanced Evacuation Analysis - 5 Procedure for calculating the travel time T

5 Procedure for calculating the travel time T

  5.1 The travel time, both that predicted by models and as measured in reality, is a random quantity due to the probabilistic nature of the evacuation process.

  5.2 In total, a minimum of 50 different simulations should be carried out for each of the four-benchmark cases. This will yield, for each case, a total of at least 50 values of tA .

  5.3 These simulations should be made up of at least 10 different randomly generated populations (within the range of population demographics specified in paragraph 3). Simulations based on each of these different populations should be repeated at least 5 times. If these 5 repetitions produce insignificant variations in the results, the total number of populations analysed should be 50 rather than 10, with only a single simulation performed for each population.

  5.4 The value of the travel time for each of the four cases: the value tI is taken which is higher than 95% of all the calculated values (i.e., for each of the four cases, the times tA are ranked from lowest to highest and tR is selected for which 95% of the ranked values are lower).

  5.5 The value of the travel time to comply with the performance standard T is the highest of the four calculated travel times tI (one for each of the four cases).

Parent topic: Appendix - Method to Determine the Travel Time (T) by Simulation Tools for the Advanced Evacuation Analysis
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