• Title/Summary/Keyword: Waterjet trenching

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Study on Performance Evaluation of Subsea Waterjet Trenching Machine Using Water Tank (수조실험을 통한 해저지반 굴삭용 워터젯 장비의 성능평가에 관한 연구)

  • Na, Kyoung-Won;Jo, Hyo-Jae;Baek, Dong-Il;Hwan, Jae-Hyuk;Han, Sung-Hoon;Jang, Min-Suk;Kim, Jae-Heui
    • Journal of Ocean Engineering and Technology
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    • v.29 no.6
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    • pp.470-474
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    • 2015
  • The demand for subsea cables and pipelines that transfer marine energy resources onshore has recently increased. Laying these underground after trenching is one engineering method to stabilize exposed subsea cables and pipelines. This experimental study found the optimum conditions for operating two types of waterjet arms mounted on an ROV trencher. A waterjet arm for trenching the seabed was scaled down at a ratio of 1:6, and a comparative analysis was conducted using diverse parameters. The results of this research provide a practical fundamental database to assist in making decisions about the ROV trencher performance in advance.

A Fundamental Study to Estimate Construction Performance of Subsea Waterjet Trenching Machine (해저지반 굴삭용 워터젯 장비의 시공성능 추정에 관한 기초적 연구)

  • Na, Kyoung-Won;Beak, Dong-Il;Hwang, Jae-Hyuk;Han, Sung-Hoon;Jang, Min-Suk;Kim, Jae-Heui;Jo, Hyo-Jae
    • Journal of Navigation and Port Research
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    • v.39 no.6
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    • pp.539-544
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    • 2015
  • There is drift toward moving offshore structures operating sites to deep water that brings subsea systems and types of apparatus to meet more severe environment than onshore. At this moment, climatic condition and seabed state affect trenching efficiency so trenching process is need to make steady progress in a short time. This paper is research on estimation about construction performance of waterjet trenching machine mounted on ROV trencher. Optimal number of nozzles that can maximize trenching efficiency is selected by considering clearance and angle of nozzles through CFD. Then verified effectiveness of waterjet apparatus on the result of trenching depth and velocity by model test analogized performance for construction work of waterjet trenching machine.