Failure analysis of a large ball valve for pipe-lines

被引：12

作者：

Bagherifard, S. ^{[1
]}

Fernandez Pariente, I. ^{[2
]}

Guagliano, M. ^{[1
]}

机构：

[1] Politecn Milan, Dip Meccan, I-20156 Milan, Italy

[2] Univ Oviedo, Dpto Ciencia Ios Mat & Ingn Met, Gijon 33203, Spain

来源：

ENGINEERING FAILURE ANALYSIS | 2013年 / 32卷

关键词：

Ball valve; Brittle fracture; Notch effect; Transition temperature;

D O I：

10.1016/j.engfailanal.2013.03.012

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In this work the failure of a sub-sea ball valve, used in an oil-piping line, is analysed. The valve was of the same type and material already used for the construction of valves that were worked in service without any problem. The valve failed in the first pressure cycles during the preliminary laboratory tests, although the applied pressure was less than the design value. Metallographic and microstructural analysis of the fracture surfaces performed by means of optical and scanning electron microscope (SEM), residual stress and hardness measurement, tensile, toughness and Charpy tests, were executed in order to identify the causes of the failure. The results allowed assessing that the failure was due to two concomitant factors: a severe notch effect and an incorrect thermal treatment. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：167 / 177

页数：11

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