RISK ANALYSIS ― HEAVY LIFTS; NORNE FPSO GAS EXPORT PROJECT

摘要

In 2000 The Nome FPSO was upgraded with an export riser and necessary process equipment for gas export. Due to high risks during installation of the new units onto the FPSO, it was decided to carry out a risk analysis of the most critical lifts. This paper concentrates on the risk analysis carried out for the lifting of one particular module, the TEG unit. The static clearance between the FPSO and the lifting vessel Regalia during the lift was very small and studies of vessel motions showed that a vessel collision could occur based on a normal vessel motion and DP inaccuracies. In particular the lift was very sensitive to the heading control of the FPSO and 1 degree heading change reduced the clearance between the vessels by 2 m. The purpose of this paper is to show that risk analyses have shown to be a very useful tool to identify where efforts in terms of economic resources and manpower should be directed to control and reduce risk prior to critical marine operation.