Abstract

A fully coupled analysis has been performed for simulation of offshore mating operation for a large heavy topside module on a deck of FLNG. Fully coupled hydrodynamic interactions between the crane vessel which lifts up the heavy topside and a FLNG of which deck the mating is made on. Multiple crane wires and slings are modeled with linear spring while LMU guide is modeled as bi-linear spring. Special attention is paid for accurate prediction of coupled hydrodynamic coefficients and pendulum dynamics due to the hanging heavy object. Simulation results will be validated by comparing model test results on key parameter affecting deck mating operation of a heavy topside module on the deck of a pre-installed FLNG on site.

Introduction

Due to increasing needs of environmentally friendly fuel supply, LNG is one of emerging resources replacing oil as well as renewable energies such as solar, offshore wind, etc. Recent drastic fall of oil prices requires variety of innovations for more economic solutions and earlier first oil. In spite of state of the art exploration technology, it is not seldom to find an oil and gas reservoir which has much larger or less capacity than first expectation. Especially in case of an oil field of much larger capacity it is need to accommodate additional large topside module on site. In such case much attentions should be paid on installation scenario and assurance of safety and operability of installation of the large topside module on site under wind, wave and current conditions because the large topside module can cause a serious hazard in case of poor installation operation.

In the present study a fully coupled analysis has been performed for simulation of offshore mating operation for a large heavy topside module on a deck of FLNG. The fully coupled hydrodynamic interactions between the crane vessel which lifts up the heavy topside and a FLNG of which deck the mating is made on. Multiple crane wires and slings are modeled with linear spring while LMU guide is modeled as bi-linear spring. Special attention is paid for accurate prediction of coupled hydrodynamic coefficients and pendulum dynamics due to the hanging heavy object.

Simulation results will be validated by comparing model test results and key parameter affecting deck mating operation of a heavy topside module on the deck of a pre-installed FLNG on site is investigated.

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