For years refinery and chemical plant operators have utilized ultrasonic-based intelligent pig technology to inspect coils in convection and radiant sections of fired heaters. This proven technology provides accurate inspection data which allows reliability engineers to make critical decisions about the operation and maintenance of fired heaters. Recent advances have increased the capabilities of these tools and extended these benefits to coker heaters containing 3" (76.2mm) nominal piping size and plug headers with radial inserts. Accurately assessing the condition of fired heater coils has proven challenging due to several factors. Conventional Non-Destructive Testing (NDT) methods, such as manual ultrasonics (UT), are ineffective in accurately assessing 100percent of the internal condition of fired heater coils. The process is further complicated by coil lengths in excess of 1,524m (5,000'), raised surfaces such as studs and fins, multiple short radius 1D X 180 deg return bends, and inaccessibility.
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机译：多年来，炼油厂和化工厂的操作人员一直使用基于超声波的智能清管器技术来检查燃烧加热器的对流和辐射部分中的线圈。这项经过验证的技术可提供准确的检查数据，从而使可靠性工程师可以对燃烧式加热器的操作和维护做出重要决策。最近的进步提高了这些工具的功能，并将这些好处扩展到包含3“（76.2mm）标称管道尺寸的焦化加热器和带有径向插入件的插头集管。由于多种因素，准确地评估加热的加热线圈的状况已证明是具有挑战性的。无损检测（NDT）方法（例如手动超声波（UT））无法准确地评估加热的加热线圈内部状态的100％，而线圈长度超过1,524m（5,000'）的情况会使该过程更加复杂，凸出的表面（例如双头螺栓和鳍片），多个短半径1D X 180度的折弯以及无法进入。
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