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The Development of Design Formulas for Pipe Loops Used in Large Vessels(II)  

Park, Chi-Mo (School of Naval Architecture And Ocean Engineering, University of Ulsan)
Yang, Park-Dal-Chi (School of Naval Architecture And Ocean Engineering, University of Ulsan)
Lee, Jong-Hoon (Institute of e-Vehicle Technology, University of Ulsan)
Publication Information
Journal of Ocean Engineering and Technology / v.23, no.1, 2009 , pp. 158-163 More about this Journal
Abstract
Many longitudinal pipes in ships are subject to considerable loads, caused by hull girder bending in the ships and/or thermal loads in some special pipes through which fluids with highly abnormal temperatures are conveyed. As these loads may cause failure in the pipes or their supporting structures, loops have been widely adopted to prevent such failure, based on the idea that they can lower the stress level in a pipe byabsorbing some portion of these loads. But as the loops also have some negative effects, such as causing extra manufacturing cost, deteriorating the function of the pipe, and occupying extra space, the number and dimensions of these loops need to be minimized. This research developed design formulas for pipe loops, modeling them as a spring element, for which the axial stiffness is calculated based on the beam theory, incorporating the flexibility effect of the straight portion of the pipe. The accuracy of the proposed design formulas was verified by comparing two results obtained from the proposed formulas and MSC/NASTRAN. This paper concludes with a sample application of the proposed formulas, showing their efficiency.
Keywords
Pipe loop; Design formula; Displacement load; Longitudinal bending of ships; Thermal load; Pipe stiffness;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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