Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Proposed OHTC Formula for Subsea Pipelines Considering Thermal Conductivities of Multi-Layered Soils

다층 지반의 열전도율을 고려한 해저배관의 총괄열전달계수식 제안

  • Park, Dong-Su (Department of Ocean Engineering, Korea Maritime and Ocean University) ;
  • Shin, Mun-Beom (Department of Ocean Engineering, Korea Maritime and Ocean University) ;
  • Seo, Young-Kyo (Department of Ocean Engineering, Korea Maritime and Ocean University)
  • 박동수 (한국해양대학교 해양공학과) ;
  • 신문범 (한국해양대학교 해양공학과) ;
  • 서영교 (한국해양대학교 해양공학과)
  • Received : 2017.11.01
  • Accepted : 2018.04.12
  • Published : 2018.04.30
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Abstract

Subsea pipelines are designed to transport mixtures of oil, gas, and their associated impurities from a wellhead that can be in excess of approximately $100^{\circ}C$, while the external temperature may be approximately $5^{\circ}C$. Heat can be lost from a subsea pipeline containing a high-temperature fluid to the surrounding environment. It is important that the pipeline be designed to ensure that the heat loss is small enough to maintain sufficient flow from the unwanted deposition of hydrate and wax, which occurs at a critical temperature of about $40^{\circ}C$. Therefore, it is essential to estimate the heat loss of a subsea pipeline in various circumstances. In previous studies, overall heat transfer coefficient(OHTC) formulas were considered only for a single soil type. Thus, it is difficult to characterize the OHTC of the actual seabed with multiple soil layers. In this paper, an OHTC formula that considers multi-layered soils is proposed for more precise OHTC estimation.

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