Eddy current analysis of shipped stainless steel heat exchanger bundle

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI:10.1016/j.csndt.2016.11.003

J.D. Angelo , A. Bennecer , P. Picton , S. Kaczmarczyk , A. Soares

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引用次数: 9

Abstract

In this paper, we present the results of a failure analysis done on new heat exchanger tubes, which shows loss of thickness during a EC inspection to stablish a prior loss of thickness base line aiming guarantee fitness for service during its working life. The root cause analysis indicates that there is intergranular corrosion due a differential concentration caused by seawater evaporation inside the tubes during the ship transit from the port of origin in China to the destination port in Brazil.

The intergranular corrosion depth showed by root cause failure analysis is smaller than that showed by EC inspection. We attribute the EC inspection results deviation to a tube magnetisation due to mechanical stress and to a secondary phase due to an incomplete solubilisation after tube conforming and welding.

Traditionally, these tubes are visually inspected and deemed acceptable but our conclusions reveal that eddy current testing is capable of detecting some corrosion anomalies which makes the tubes unfit for service.

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不锈钢热交换器管束的涡流分析

在本文中，我们提出了对新热交换器管进行失效分析的结果，该结果显示了EC检查期间厚度损失的情况，以建立厚度损失基线，以保证其在工作寿命期间的适用性。根本原因分析表明，船舶在从中国始发港到巴西目的港的运输过程中，由于管内海水蒸发造成的浓度差异，造成了晶间腐蚀。根本原因分析显示的晶间腐蚀深度小于EC检测显示的深度。我们将EC检查结果偏差归因于由于机械应力引起的管磁化和由于管合格和焊接后不完全溶解引起的二次相。传统上，这些管是目测检查，认为是可以接受的，但我们的结论表明，涡流测试能够检测到一些腐蚀异常，使管不适合使用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Case Studies in Nondestructive Testing and Evaluation

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