ABSTRACT

The first Floating Production Storage and Offloading platforms (FPSOs), many still operating in Campos Basin, were converted from single-hull oil tankers. Therefore, collision leading to the FPSO side plating fracture is a serious concern. To simplify the numerical simulation of collision a Platform Supply Vessel (PSV) is modelled assuming a perfectly rigid bow structure, which can deem excessively conservative assessment. Therefore, the objective of this paper is to evaluate the actual expected collision damage considering a deformable PSV bow structure. In this investigation, the resistance of a single-hull FPSO side structure is studied for two collision scenarios, considering the PSV bow rigid and deformable and employing RTCL and plastic strain fracture criteria. It is shown that the conservative combination of equivalent plastic strain criterion and rigid bow may overestimate the damage severity, while the consideration of deformable PSV bow and RTCL criterion does not lead to a single-hull FPSO fracture for the collision scenarios investigated.

摘要

第一个浮式生产储油卸油平台 (FPSO)，许多仍在坎波斯盆地运行，由单壳油轮改装而成。因此，导致FPSO侧板断裂的碰撞是一个严重的问题。为了简化碰撞的数值模拟，平台供应船（PSV）被建模，假设一个完美刚性的船首结构，这可能被认为过于保守的评估。因此，本文的目的是评估考虑可变形 PSV 船首结构的实际预期碰撞损伤。在这项研究中，考虑到 PSV 船首的刚性和可变形性，并采用 RTCL 和塑性应变断裂准则，研究了单船体 FPSO 侧结构在两种碰撞情况下的阻力。