Test Case Head-On Collision

Introduction

This page describes one of a series of selected Test Cases which have been analysed/verified by use of the IWRAP program and by hand calculation. Only the number of collision candidates is calculated.

This test case calculates the number of head on collisions per year.

The Scenario

To calculate this scenario with the IWRAP tool, do the following steps:

• Define leg;
• define traffic distribution in each direction;
• define causation factors;
• define number of ships in each direction;
• run the job and read results.

Note that we here use 10000 crude oil tankers in the length interval 200-225m.

From this length interval and ship type IWRAP looks up the breadth and speed using the predefined dimension tables described Here.

Hand calculation of the Head-On Collision Senario

This result is equal to the result calculated by IWRAP

Source: IWRAP Mk II, Basic Modelling Principles for Prediction of Collision and Grounding Frequencies, (draft working document), Rev. 4, 2008.03.09, Peter Friis-Hansen, Technical University of Denmark.