Expansion Spool Design of an Offshore Pipeline by the Slope Deflection Method

J. Ocean Eng. Technol. 2010;24(5):1-7.

Choi Han-Suk,Do Chang-Ho,Na Young-Jang

Dept. of Naval Architecture and Ocean Engineering Pusan National University,Hyundai Heavy Industry Co. Ltd.,Hyundai Heavy Industry Co. Ltd.

Keywords: Offshore subsea pipeline, Pipeline expansion, Slope deflection method, Expansion spool

Abstract

Offshore, sub-sea pipelines that transport oil and gas experience thermal expansion induced by the temperature of the transported medium during operation. The expansion of the pipeline can induce overload and cause damage to offshore platforms or sub-sea structures that are connected to the pipelines. To mitigate and prevent these incidents, expansion spools are installed between offshore, sub-sea pipelines and risers on the platform. This paper presents the results of the study and development of a simplified design method for expansion spools, using the slope deflection method for the purpose of preliminary design or front-end engineering and design (FEED).