Optimum Structural Design of Pipe Loops Used in Large Vessels(I)

J. Ocean Eng. Technol. 2007;21(5):47-54.

Park Chi-Mo,Jang Dae-Oh,Han Sam-Duck

School of Naval Architecture and Ocean Engineering University of Ulsan,School of Naval Architecture and Ocean Engineering University of Ulsan,Hyundai Heavy Industry Co. Ltd.

대형 선박의 파이프 루프 최적구조설계(I)

박치모,장대오,한삼덕

울산대학교 조선해양공학부,울산대학교 조선해양공학부,현대중공업(주)

Keywords: Structural design, Pipe loop, Longitudinal bending of ships, Displacement load, Pipe stiffness, Design formula

핵심용어: 구조설계, 파이프 루프, 선체 종굽힘, 변위하중, 파이프 강성, 설계식

Abstract

Ship structures are subject to severe environmental loads causing appreciable hull girder deflection which in turn affects the piping system attached to the main hull in the form of displacement load. While this load may cause failure in the pipes, loops have been widely adopted as a measure of preventing this failure with the idea that they may lower the stress level in a pipe by absorbing some portion of the displacement load. But as the loops also have some negative effects such as causing extra manufacture cost, deteriorating the function of the pipe and occupying extra space, the number and the dimensions of the loops adopted need to be minimized. This research develops a design formula for pipe loops. The accuracy of the proposed design formula was verified by comparing two results respectively obtained by the proposed formula and MSC/NASTRAN. The paper ends with the sample example showing the efficiency of the proposed formula.