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Development of Design Formulas for Pipe Loops Used in Ships Considering the Curvature of Corners  

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)
Publication Information
Journal of Ocean Engineering and Technology / v.23, no.4, 2009 , pp. 91-99 More about this Journal
Abstract
Many longitudinally arranged pipes in ships are subject to considerable displacement loads caused by the hull girder bending of 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 as a measure to prevent such failure, with the idea that they can lower the stress level in a pipe by absorbing some portion of these loads. But since such loops have some negative effects, such as causing extra manufacturing cost and occupying extra space, the number and dimensions of the 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 effects of the curvature of loop corners and the flexibility of the straight portion of the pipe. The accuracy of the proposed design formulas was verified by comparing two results respectively obtained by the proposed formulas and MSC/NASTRAN. The paper ends with a sample application of the proposed formulas showing their efficiency.
Keywords
Pipe loop; Design formula; Curvature of corners; Castigliano's theorem; Displacement load; Thermal load; Pipe stiffness;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 박치모, 양박달치, 이종훈 (2009). "대형 선박의 파이프 루프 설계식 개발(II)", 한국해양공학회지, 제23권, 제1호, pp 132-137
2 Popov, E.P. (1999). Engineering Mechanics of Solids, Prentice Hall, pp 326, 595, 853
3 박치모, 양박달치, 이종훈 (2008). "대형 선박의 파이프 루프 설계식 개발(I)", 한국해양공학회지, 제22권, 제5호, pp 132-137
4 JIS (Japanese Industrial Standard) (1988). JIS G 3454-1988;Carbon Steel Pipes for Pressure Service
5 현대중공업 (2007). Arr't of Outfittings on Upper Deck
6 Lloyd's Register (2006). Ship Piping Systems, Part 5, Chapter 13, Section 2, pp 3-4
7 ABS (American Bureau of Shipping) (2008). Rules for Building and Classing Steel Vessels, Part 4, Chapter 6, Section 2, pp 389
8 DNV (Det Norske Veritas) (2007). Rules for Ships, January 2007, Part 3, Ch. 1, Sec. 8, pp 69 and Sec. 12, pp 88
9 Pytel, A. and Kiusalaas, J. (2003). Mechanics of Materials, Thomson Learning Academic Resource Center, pp 420-421
10 현대중공업 (1987). Design Manual (Calculation of Pipe Expansion)