대형 선박의 파이프 루프 설계식 개발(Ⅱ)
The Development of Design Formulas for Pipe Loops Used in Large Vessels(Ⅱ)
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초록
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 by absorbing 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
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 by absorbing 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
참고문헌 (9)
- 박치모, "대형 선박의 파이프 루프 최적구조설계(Ⅰ)", 한국해양공학회지, 21(5), pp.47~54 (2007), 한국해양공학회
- 박치모, "대형 선박의 파이프 루프 설계식 개발 (Ⅰ)", 한국해양공학회지, 22(5), pp.132~137 (2008), 한국해양공학회
- 현대중공업, "Design Manual (Calculation of Pipe Expansion)", ~ (1987)
- 현대중공업, "Manual of Arr't of Outfittings in Passageway", ~ (2001)
- ABS (American Bureau of Shipping), "Rules for Building and Classing Steel Vessels, Part 4, Chapter 6, Section 2", 389~ (2008)
- DNV (Det Norske Veritas), "Rules for Ships, January 2007, Part 3, Ch. 1, Sec. 8, pp 69 and Sec. 12", 88~ (2007)
- JIS (Japanese Industrial Standard), "JIS G 3454-1988; Carbon Steel Pipes for Pressure Service", ~ (1988)
- Lloyd's Register, "Ship Piping Systems, Part 5, Chapter 13, Section 2", 3~4 (2006)
- Popov, E.P., "Engineering Mechanics of Solids", pp.326~ (1999), Prentice Hall