Two-Stage Corrosion Under Insulation Detection Methodology and Modular Vehicle with Dual Locomotion Sensory Systems

Abstract

Methods and systems for inspecting insulated equipment for corrosion under insulation are provided. The system includes an autonomous unmanned vehicle having aerial and ground locomotive capabilities. The vehicle includes an infrared detector and a pulsed eddy current sensor. In the method, infrared waves emitted from the equipment are detected along the equipment with the infrared detector. Using the infrared detector, at least one image of an inner surface of the equipment is developed based on the detected infrared waves. At least one area that is susceptible to corrosion is determined based on the at least one image. The susceptible area is inspected with the pulsed eddy current sensor, which induces an eddy current in the inner wall of the equipment. Based on a rate of the decay in strength of the eddy current, it is determined whether corrosion exists at the susceptible area using a processor configured by code.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a system and process for inspecting equipment for corrosion, and, more specifically, relates to nondestructive testing systems and methods for evaluating insulated equipment for corrosion under insulation and to vehicles including unmanned, autonomous, modular vehicles with dual locomotion (e.g., aerial and crawling) capabilities and dual sensory systems.BACKGROUND OF THE INVENTION[0002]Corrosion under insulation (CUI) is a particular type of corrosion that can occur in insulated equipment (e.g., piping) due to ingress of water into the insulated layer and moisture build-up on the external surface of the insulated equipment. Insulated equipment that is exposed to mist and cooling water towers, as well as equipment that is exposed to steam vents can be especially vulnerable to the development of CUI. CUI is difficult to detect in its early stages as its precursor is merely the accumulation of moisture and water patches unde...

AI Technical Summary

Benefits of technology

The present invention provides systems for inspecting insulated equipment for corrosion under insulation. These systems include an autonomous, modular unmanned vehicle that has aerial and ground locomotive capabilities and is capable of inspecting insulated equipment. The vehicle has an infrared module with an infrared detector and a pulsed eddy current (PEC) module with at least one sensor. The vehicle can also have a power source and a power receiver for wireless transfer of power. The vehicle can also have an infrared gas detector for testing for gas emissions indicative of corrosion under insulation. The system also includes a control station, mobile robot, and handheld device for inspecting insulated equipment.

Problems solved by technology

Insulated equipment that is exposed to mist and cooling water towers, as well as equipment that is exposed to steam vents can be especially vulnerable to the development of CUI.

CUI is difficult to detect in its early stages as its precursor is merely the accumulation of moisture and water patches underneath the insulation layers, which is not visible from outside of the equipment.

CUI that remains undetected can cause major damage to the equipment and, in severe cases, can even result in the closure of a process unit that features the damaged equipment.

These current practices, however, are time consuming and costly.

Specifically, downtime of the insulated equipment during inspection, replacement of cladding after inspection, and repairs to damaged equipment (e.g., removing damaged insulation) all result in increased costs.

Early detection of CUI can limit the damage to the equipment and thus limit the economic effects of the damage; however, early detection of CUI is difficult due to the time-consuming nature of the current inspection processes and the hidden nature of the precursors of CUI.

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