ABSTRACT

As lifting of FPSO accommodation is an important process of the project construction, safe lifting of the accommodation onto the hull can ensure the normal operation of the subsequent construction. The overall hoisting method can not only shorten the hoisting cycle, but also better ensure the integrity of the built-up structure, so it has been widely used in recent years. On the other hand, overall lifting is mostly floating lifted based on the huge weight. Therefore, more factors must be considered in the finite element strength analysis of accommodation structure for floating lifting than the general lifting on land. The purpose of this paper is to study the design of the load and working conditions of FEA for accommodation structure, based on lifting method of floating crane, the setting of the lifting lugs, the inclination angle caused by the hull. The results show that the high stress area is concentrated on the supporting structure of lifting holes and the area near the lifting holes. And reasonable arrangement of the lugs and the structure strengthened by temporary supporting members can reduce the stress.

INTRODUCTION

The FPSO accommodation is an important part of the FPSO construction. In order to improve the efficiency and quality of the shipyard during the construction, the accommodation of large ships and offshore engineering vessels usually adopt modular construction methods. All the components and associated equipment will be installed in the final assembly stage, which leads to the weight of the total module getting bigger and bigger.

Due to factors such as the dock cycle and the size of the dock and the lifting capacity of the shipyard, the overall lifting of accommodation is usually floating lifted at the dock. As the module's size and weight is increasing, the module's rigidity is weak. The accommodation is not directly involved in the overall longitudinal strength analysis of the hull and the structural strength is relatively weak. So that leads to reinforcement of the structure of the lifting lug when liting, and it is also necessary to simulate the lifing procedure through simulation software to check whether the structural strength meets the requirements, which ensure the safety and stability of the lifing process(Huang, 2017).

This content is only available via PDF.
You can access this article if you purchase or spend a download.