如何在绝缘(CUI)下发现腐蚀以及无损检测(NDT)技术最好?这些是有利于尽职尽责的系统运营商在试图抵消其系统中隐藏腐蚀的昂贵问题时应询问。CUI是预防措施最困难的腐蚀过程之一,但采用主动措施,例如旨在检测腐蚀早期迹象和缓解潜在管道故障的检验方案的开发至关重要。
事实上,腐蚀是如此昂贵的是全国腐蚀工程协会(NACE)estimates that the global cost of corrosion is approximately $2.5 trillion USD. So, what is the key to limiting the cost of corrosion for a system operator and how do you find corrosion under insulation?
我们写了关于这个可能会发现腐蚀的条件在前一个博客文章中的绝缘下。电竞app竞猜如果您想了解CUI风险因素,您可能会发现它,您可能希望在那里开始。但是,如果您想知道我们如何使用非破坏性测试技术在绝缘系统中找到腐蚀,请阅读。
让我们看看你最常见的方法NDT顾问在构建检查计划时可能会考虑或排除:
目视检查I.E.绝缘清除
目视检查是定位腐蚀的最有效的NDT方法之一,但具有一对大警告的措施。绝缘体的去除是最昂贵和劳动密集型腐蚀的方法。通过石棉的存在,可以使这个过程的物流更加复杂。更重要的是,如果您的操作在目视检查期间使用,则系统可能会遇到过程问题。
While extremely effective, visual inspection is ultimately more useful to establish a baseline and a plan of action moving forward for your CUI inspection which will be paired with other NDT methods.
Profile Radiography
轮廓造影是一种简单且有效的技术,可以检查易受腐蚀的管道,尽管其检测内壁厚度的减小的能力。该NDT技术具有一些不同的优点,包括高水平的便携性,扫描管道的能力而不消除绝缘,以及相对便宜和快速的结果。
然而,这种方法可能是限制性的,因为它只能验证小区域,并且在扫描直径大于10英寸的管道时可以在技术上具有挑战性。由于辐射导致的安全问题,防止他人在检查期间在周围地区工作。根据您的系统,这可能导致停机或调度延迟。
超声波厚度测量
Ultrasonic thickness measurement is a technique that measures the thickness of a solid element based on the movement of ultrasound waves. This is another effective technique that can measure wall thickness through a variety of linings and coatings. One benefit of this technique is that you only need access to one side of the piping under inspection.
然而,超声波厚度测量随着自己的一组限制,包括扫描限制在一个小面积和需要将小孔切入绝缘的并发症以执行可能昂贵并且可能损害绝缘的完整性(这可以增加已经检查的CUI问题)。
红外热成像
红外热成像是一种能够检测管道绝缘内的水分斑点的技术。该方法通过检测干燥绝缘和潮湿绝缘之间的温度差。在有湿绝缘的情况下,有可能(但并不总是)是腐蚀。这种方法的一个好处是红外热成像可以在不直接接触管道的情况下,增强安全性以及节省时间和金钱的管道。该方法通常比其他水分量表更快且更敏感。
中子反向散射
中子后向散射是另一个技术用于detect moisture within insulation. This method uses a radioactive source which emits high energy neutrons into the insulation which respond to water particles that may be present. These results point to areas where there is a higher probability of corrosion present. This process is relatively quick and accurate. However, methods like neutron backscatter, which point to areas of probable corrosion, can generate false positives because the presence of moisture does not guarantee that corrosion is also present.
实时射线照相
这种技术符合其名称,通过绝缘提供管道外径的实时看,该绝缘是在检查期间在电视监视器上看到的Import拍摄的图像。实时造影提供相对于传统射线照相的安全性和速度增强。该方法仅限于小结构,并且需要在检查下进入管道的两侧。
Pulsed Eddy Current
Pulsed eddy current is an NDT inspection technique which uses electromagnetic waves to determine the wall thickness of a material which conducts electricity with probes placed on the pipe wall under inspection. While highly accurate, this technique is typically only used as a screening method because it only provides an average wall thickness.
为您的CUI检验计划提供NDT方法
As you can tell by the strengths and weaknesses of the typical methods an NDT consultant can use to detect and measure corrosion, a combination of methods are often leveraged to screen a system for areas where corrosion has likely occurred. This initial screening then points to targeted areas of piping that require additional inspection and measurement. While Braun Intertec does not currently offer neutron backscatter, real-time radiography, or pulsed eddy current, it’s important to be aware of the range of options available.
As NDT inspectors with decades of experience between us, we use our expertise and experience examining complex operations to help guide you to the inspection methods best suited for your system, budget and concerns.
Contact Our Nondestructive Testing Consultants
If you’re interested in learning more about how Braun Intertec can help you develop a CUI inspection program or assess your operation for corrosion threats, reach out to us through the contact us button below and we will be in touch.