Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Effects of Ambient Temperature Change on the Internal Pressure Change of Multi-Layered Subsea Pipeline

주위 온도변화가 다층구조 해저 파이프라인 내부 압력변화에 미치는 영향

  • Yang, Seung Ho (Department of Mechanical Engineering, Ulsan College)
  • 양승호 (울산과학대학교 기계공학부)
  • Received : 2019.08.26
  • Accepted : 2019.10.28
  • Published : 2019.10.31
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Abstract

The subsea pipeline has received considerable attention as a high-value-added industry linked to the energy and steel industries including natural resource development. The design and installation of the subsea pipeline require a variety of key technologies to carry out the project. In particular, a thorough pre-verification process through pre-commissioning is essential for the safe operation of the subsea pipeline. The hydrotesting stage in the pre-commissioning process of the subsea pipeline is known to be affected significantly by the ambient temperature change; however, there is a little study based on the theoretical and numerical approach. In this study, the method of predicting the internal temperature change using the transient heat transfer method for the stage of hydrotesting during the pre-commissioning process of the subsea pipeline and the prediction method of the pressure variation in the pipeline using it were proposed. The predicted results were compared with field test results and its effectiveness was verified. The proposed analysis procedure is expected to contribute to the productivity improvement of the subsea pipeline installation project by enabling the prediction of pressure variation through pipeline heat transfer simulation from the initial design stage of the subsea pipeline installation project.

해저 파이프라인은 자원개발을 포함한 에너지산업 및 철강산업과 연계한 고부가가치 산업으로서 상당한 관심을 받아왔다. 해저 파이프라인의 설계와 설치 프로젝트 수행을 위해서는 다양한 핵심요소기술들이 필요하다. 특히, 해저 파이프라인의 안전한 운영을 위해서는 예비커미셔닝을 통한 철저한 사전검증과정이 필수 불가결한 부분이다. 해저 파이프라인 예비커미셔닝 과정 중 하이드로테스팅 공정은 파이프라인 주위 온도변화에 크게 영향을 받는 것으로 알려져 있으나 이에 관한 이론적, 수치해석적 접근방법을 활용한 연구는 미미한 편이다. 본 연구에서는 해저 파이프라인의 예비커미셔닝 과정 중 하이드로테스팅 공정에 대해 과도열전달 해석법을 활용하여 내부 온도변화량 산정 및 이를 활용한 파이프라인 내부 압력변동량 예측법을 제시하였고 예측된 결과를 현장 실계측 데이터와 비교·검토하여 그 유효성을 입증하였다. 제안된 해석절차는 해저 파이프라인 설치 프로젝트 수행 사전단계에서부터 파이프라인 열전달 시뮬레이션을 통해 압력변동량 예측을 가능하게 함으로써 해저 파이프라인 설치 프로젝트의 생산성 향상에 크게 기여할 것으로 사료된다.

Keywords

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