• Title/Summary/Keyword: 해저 원유 파이프라인

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Serviceability Assessment of Corroded Subsea Crude Oil Pipelines (부식된 해저 원유 파이프라인의 사용적합성 평가)

  • Cui, Yushi;Kim, Dong Woo;Seo, Jung Kwan;Ha, Yeon Chul;Kim, Bong Ju;Paik, Jeom Kee
    • Journal of the Society of Naval Architects of Korea
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    • v.52 no.2
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    • pp.153-160
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    • 2015
  • Pipelines are one of the most important structures in subsea equipment. It is the main equipment for transportation of crude oil and natural gas to the downstream facilities. Crude oil and natural gas leak will be carry out not only political and financial issues but also pollution to the environment. Inaccurate predictions of corrosion behavior will make hazardous consequences. The serviceability assessment of corroded structures is essential especially for subsea pipelines. As corrosion is concerned, the effects of failure due to significant reduction will make it hard to the pipeline operator to maintain the serviceability of pipelines. In this paper, the serviceability assessment of corroded crude oil pipeline is performed using the industry design code (Shell92, DNV RP F101, ASME B31G, BS 7910, PCORRC) and FEA depending on corrosion area. In last step, the future integrity of the subsea crude oil pipeline is assessed to predict the remaining year in service of crude oil pipelines.

A Study on the Wave Drift Damping of Moored Floating Structures in Regular Waves (계류된 부유체의 규칙파중 표류감쇠에 대한 연구)

  • Park, In K.;Choi, Hang S.
    • Journal of the Society of Naval Architects of Korea
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    • v.33 no.1
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    • pp.40-53
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    • 1996
  • In this paper, the wave drift damping is studied. An approximate method is adopted to calculate the wave drift damping for the sake of practical applications. By assuming the ship's forward speed to be low, the Green function and the velocity potential are expanded asymptotically with respect to the Brard number(${\tau}$) and terms up to the first order of ${\tau}$ are retained. Mean wave drift forces are computed straightforwardly. The wave drift damping is estimated as the change rate of the mean wave drift force with respect to the ship's speed. In order to validate the present method, Series 60(Cb=0.7) ship is exemplified for forward speed of Fn=0, 0.02 and 0.04. To predict the wave drift damping experimentally, three geosym models of the Esso-Osaka tanker are used. Also the effect of drift angle on the wave drift damping is also considered. Comparisons between numerical and experimental results show reasonable agreements.

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