The collision problem is one of the design factors that must be carefully considered for the risk of collision occurring during the operation of ships and offshore structures. This paper presents the main results of the ship collision study, and its main goal is to analyze potential crash scenarios that may occur in the FLNG (Floating Liquefied Natural Gas) considering the likelihood and outcome. Consideration being given to vessels visiting the FLNG and surrounding vessels navigating around, such as functionally supported vessels and offloading carriers. The scope includes vessels visiting the FLNG facility such as in-field support vessels and off-loading carriers, as well as third party passing vessels. In this study, based on QRA (quantitative risk assessment), basic research methods and information on collision are provided. Based on the assumptions and methodologies documented in this study, it has been possible to clarify the frequency of collision and the damage category according to the type of visiting ship. Based on these results, the risk assessment results related to the collision have been derived.

Abstract
 1. Introduction
 2. Ship collision hazards
  2.1 Type of collision
  2.2 Cause of collision
 3. Impact energy calculations
  3.1 Impact energies for passing vessel
  3.2 Impact energies for off-loading carrier
  3.3 Impact energies for MPV (multi-purpose vessels)
 4. Assessment of collision risk
 5. Conclusions
 References

• Bon Guk Koo(Department of Naval Architecture and Marine Engineering, Changwon National University)