Failure of hydrocracker heat exchanger tubes in an oil refinery by polythionic acid-stress corrosion cracking

被引：19

作者：

Tawancy, H. M. ^{[1
]}

机构：

[1] King Fahd Univ Petr & Minerals, Res Inst, Engn Res Ctr, Dhahran 31261, Saudi Arabia

来源：

ENGINEERING FAILURE ANALYSIS | 2009年 / 16卷 / 07期

关键词：

Stainless steel; Stress corrosion cracking; Polythionic acid; Oil refinery;

D O I：

10.1016/j.engfailanal.2009.02.002

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Heat exchanger tubes of a hydrocracker unit in an oil refinery developed cracks at the bent sections after about 48 h of operation at 400 degrees C following a period of downtime. The tubes were fabricated from 321 stainless steel. Detailed analysis by various electron-optical techniques and X-ray diffraction showed that the tubes were cracked by stress corrosion cracking induced by polythionic acid. Due to the presence of H(2)S in the environment, the inner surface of the tubes was converted into sulfur-bearing scale during operation. This could promote the formation of polythionic acid by aqueous condensates during downtime leading to cracking in the presence of residual internal stresses. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2091 / 2097

页数：7

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