Study on leak rate in LBB analysis of welded pipe

2018 International Conference on Advanced Materials, Intelligent Manufacturing and Automation

材料科学;机械制造;运输工程

Li, Chunrun^1,2 ; Shen, Yanwei^1,2 ; He, Yazhang^1,2 ; Zhang, Tianli^1,2 ; Liu, Jian^1,2 ; Chang, Liang^1

CNPC Engineering Technology Research Co. Ltd, No. 40 Jintang Road Tanggu, Tianjin

300451, China^1

Key Laboratory of Offshore Engineering of CNPC, No. 40 Jintang Road Tanggu, Tianjin

300451, China^2

关键词: Crack length;    Finite element analysis software;    Leak before breaks;    Leak rate;    Linear relationships;    Single phase fluids;    Through cracks;    Welded pipes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/382/3/032020/pdf
DOI  :  10.1088/1757-899X/382/3/032020

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The leak-before-break (LBB) technology has been widely used in the design of welded pressure vessels and pipelines, and it is based on the theory that the penetration of fluid through cracks, which exist in the walls of the pipe and vessel, can be detected before the they reach a state of instability. In this paper, leak rates in different opening direction are calculated and analysed by finite element analysis software Fluent in the case of single phase fluid. It is concluded that there is no linear relationship between the leak rate and the CTOD value or the crack length, and that the influence of the CTOD increase on the leak rate is greater than that of the crack length.