Comprehensive inspection of refrigerated ammonia storage tank welded joints by the metal magnetic memory technique and c
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RESEARCH PAPER
Comprehensive inspection of refrigerated ammonia storage tank welded joints by the metal magnetic memory technique and conventional NDT methods Sergey Kolokolnikov 1
&
Anatoly Dubov 1
&
Andrei Medvedev 2
&
Dmitry Boriskin 2
Received: 18 March 2019 / Accepted: 14 June 2020 # International Institute of Welding 2020
Abstract Refrigerated ammonia storage tanks (RAST) are hazardous industrial facilities, where accidents with severe consequences occur. Defects of welded joints are one of the main reasons of RAST accident occurrence. Due to this, during the technical inspection, special attention is paid to quality control of welded joints. The use of non-destructive testing (NDT) for defect detection is essentially important as it can be used to assess the integrity of such critical steel structures as storage tanks. Among the several NDT techniques available, acoustic emission (AE) can supply valuable information assessing structural integrity, detecting flaws and leaks in base metal and welded joint. However, assessing structural integrity usually includes other NDT techniques (e.g., visual examination, ultrasonic testing, dye penetrant test) additionally to AE, providing complementarity between different NDT techniques. Nevertheless, conventional NDT methods are aimed at detecting only the defects that occurred during manufacturing and operation and do not assume stress-strained state (SSS) assessment. The metal magnetic memory (MMM) technique is a passive magnetic one that is recommended to be applied for SSS assessment in accordance with guidance documents. A flaw detectability relation between UT and MMM techniques is observed. Keywords Defect . Metal magnetic memory technique . Non-destructive testing . Stress analysis . Weld
1 Introduction
Recommended for publication by Commission V - NDT and Quality Assurance of Welded Products * Sergey Kolokolnikov [email protected] Anatoly Dubov [email protected] Andrei Medvedev [email protected] Dmitry Boriskin [email protected] 1
Energodiagnostika Co. Ltd., Moscow, Russia
2
“Azot” KJSC, Kemerovo, Russia
Tanks for storage of refrigerated gases are one of the most hazardous industrial facilities (HIF), where accidents with severe consequences occur [1]. Defects of welded joints are one of the main reasons for storage tank accident occurrence [2, 3]. Due to this, during the technical inspection, special attention is paid to quality control of refrigerated ammonia storage tank (RAST) welded joints, especially in the bottom part and the first rings of the tank shell to the height of up to 10 m [4]. In the technical inspection of a refrigerator vertical steel tank based on [4], the main non-destructive testing (NDT) method is acoustic emission (AE). Other NDT methods (visual examination (VE), ultrasonic testing (UT), dye penetrant test) are considered additional and used on the internal shell in places with increased activity of identified AE sources in order to determine the actual location of defects that occurred in the process of
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