Abstract

Floating Liquefied Natural Gas (FLNG) is the term used for producing, processing, storing and offloading natural gas at sea. Cryogenic hazards represent a significant safety risk for assets and personnel, but current methods to estimate the cryogenic risks are still coarse.

Lloyd's Register (LR) has taken the initiative to develop a more advanced approach to Cryogenic Risk and Cryogenic Spill Protection (CSP) Optimization: the Advanced Cryogenic Structural Collapse Analysis (CSCA). The CSCA is a numerical approach that fully couples 3D CFD cryogenic flow modelling with 3D FEM thermal and structural response to prevent structural escalation.

This paper describes the first and second step of the CSCA: the cryogenic flow modelling with CFD and the thermal response of the load bearing structures with FEM to one representative cryogenic load. The CFD solver used is KFX-LNG by ComputIT and the thermal code is FAHTS by USFOS.

The capabilities, tests and state-of-the-art of KFX™-LNG for cryogenic flow modelling are discussed. The paper also describes the capabilities, tests and state-of-the-art of FAHTS for thermal response of main load bearing structures. The paper then concludes with a cryogenic analysis with KFX-LNG and FAHTS of an accidental LNG leak on a realistic offshore module. The CSCA numerical approach to solve the potential structural collapse of the offshore module (non-linear stress-strain analysis) is not described here.

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