Failure analysis of AISI 321 tubes of heat exchanger

被引：28

作者：

Corte, J. S. ^{[1
]}

Rebello, J. M. A. ^{[1
]}

Areiza, M. C. L. ^{[1
]}

Tavares, S. S. M. ^{[2
]}

Araujo, M. D. ^{[3
]}

机构：

[1] Univ Fed Rio de Janeiro, COPPE, Programa Engn Met & Mat, BR-21941 Rio De Janeiro, Brazil

[2] Univ Fed Fluminense, Escola Engn, PGMEC, BR-24210240 Niteroi, RJ, Brazil

[3] Araujo Engn Ltd, Vinhedo, Brazil

来源：

ENGINEERING FAILURE ANALYSIS | 2015年 / 56卷

关键词：

Stress corrosion cracking; Austenitic stainless steel; Tube shell heat exchanger;

D O I：

10.1016/j.engfailanal.2015.03.008

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The present study is about the failures of tubes from a tube shell heat exchange in one of the compression stages used to cool and purify the gas produced in an off-shore platform. Conventional hydrostatic tests did not detect leaking in the heat exchanger, but these tests were conducted at room temperature, i.e., very distant to the service temperature (163 degrees C). However, tightness tests with helium gas have detected leaking. Some tubes were taken off for analysis and the liquid penetrating test detected cracks in crevices formed between the tube and the tube sheet. The cracks were found to be typical stress corrosion cracks with branched pattern. A non-destructive test with Eddy current probes was developed to give high percentage of detection. The work was conclusive about the main cause of failures. Due to the increase of chloride content of the water processed to concentrations higher than 1000 mg/L over the years, the substitution of AISI 321 tubes by superduplex steel is recommended. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：170 / 176

页数：7

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