A Study on the Structural Analysis of Curved Portions of Pipe Loops Used in Ships

J. Ocean Eng. Technol. 2010;24(5):88-93.

Park Chi-Mo,Bae Byoung-Il

School of Naval Architecture And Ocean Engineering University of Ulsan,School of Naval Architecture And Ocean Engineering University of Ulsan

선박용 파이프 루프 곡선부의 구조해석에 관한 연구

박치모,배병일

울산대학교 조선해양공학부,울산대학교 조선해양공학부

Keywords: Pipe loop, Curvature of corners, Finite element analysis, Straight-beam element, Curved-beam element, 2-D shell element, 3-D solid element

핵심용어: 파이프 루프, 코너부 곡률, 유한요소해석, 직선 보 요소, 곡선 보 요소, 2차원 쉘 요소, 3차원 고체 요소

Abstract

Many pipes that are arranged longitudinally in ships have loops at intervals to prevent the failure of the pipes as they absorb large portions of the axial load caused by the bending of the hull girder and/or thermal loads when the pipes are carrying very hot fluids. Since the loops are curved at corners, an efficient method for conducting the structural analyses of these curved portions is required. In this paper, a pipe loop was analyzed by an analytical method and by the finite-element method in four different ways, i.e., based on straight-beam elements, curved-beam elements, 2-D shell elements, and 3-D solid elements. The results of the five analyses were compared to check the validity of the current curved-beam theory. The paper includes some suggestions on how to analyze the pipe loops efficiently.