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.

中文翻译：

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利用金属磁记忆技术和常规无损检测方法对冷藏氨水储罐焊接接头进行全面检查

冷藏氨储存罐（RAST）是危险的工业设施，会发生严重后果的事故。焊接接头的缺陷是RAST事故发生的主要原因之一。因此，在技术检查期间，应特别注意焊接接头的质量控制。使用非破坏性测试（NDT）进行缺陷检测至关重要，因为它可用于评估诸如储罐之类的关键钢结构的完整性。在可用的几种NDT技术中，声发射（AE）可以提供有价值的信息，以评估结构完整性，检测母材和焊接接头的缺陷和泄漏。但是，评估结构完整性通常包括除AE之外的其他NDT技术（例如，目测，超声测试，染料渗透测试），提供不同NDT技术之间的互补性。然而，常规的无损检测方法仅旨在检测在制造和操作过程中发生的缺陷，而不承担应力应变状态（SSS）评估。金属磁记忆（MMM）技术是一种被动磁技术，根据指导文档，建议将其用于SSS评估。观察到UT和MMM技术之间的缺陷可检测性关系。金属磁记忆（MMM）技术是一种被动磁技术，根据指导文档，建议将其用于SSS评估。观察到UT和MMM技术之间的缺陷可检测性关系。金属磁记忆（MMM）技术是一种被动磁技术，根据指导文档，建议将其用于SSS评估。观察到UT和MMM技术之间的缺陷可检测性关系。