Design of a Floating-Liquefied-Natural-Gas System for Severe Metocean Conditions

Fig. 1—Spread-moored FLNG host FPSO.

In the past few years, several floating-liquefied-natural-gas (FLNG) projects have become commercial. However, most FLNG systems designed to date remain complex, costly, and operationally limited to areas with benign-to-moderate metocean conditions that allow side-by-side offloading of the liquefied natural gas (LNG). This paper describes a split-process FLNG design where primary production and gas-treatment functions are provided on a host platform while liquefaction occurs on a separate vessel. The arrangement works in moderate-to-severe metocean conditions.

Introduction

Today, FLNG is generally accepted in the industry as feasible. The focus is now on technology selection, liquefaction and storage capacity, and safe operational considerations, particularly with regard to LNG offloading.

Concerns typically raised with proposed FLNG schemes include

  • Size, weight, and complexity of topside
  • Topside hydrocarbon inventory and effect on safety design
  • LNG-offloading method and sea-state limitations
  • Overall project cost, schedule, and uncertainty
  • Design for generic application and residual value
This article, written by Special Publications Editor Adam Wilson, contains highlights of paper OTC 27074, “Design Case Study for a 4-Mt/a FLNG System for Severe Metocean Conditions,” by Robert M. Shivers III, SPE, and Richard P. Michel, LoneStar FLNG; and Norman P. Kolb, Strategy Engineering, prepared for the 2016 Offshore Technology Conference, Houston, 2–5 May. The paper has not been peer reviewed. Copyright 2016 Offshore Technology Conference. Reproduced by permission.
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Design of a Floating-Liquefied-Natural-Gas System for Severe Metocean Conditions

01 February 2017

Volume: 69 | Issue: 2

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