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

• US 20180335404A1
• Filed: 05/19/2017
• Published: 11/22/2018
• Est. Priority Date: 05/19/2017
• Status: Active Grant

• Current Assignee: Saudi Arabian Oil Company (Government of Saudi Arabia)
• Original Assignee: Saudi Arabian Oil Company (Government of Saudi Arabia), King Abdullah University of Science and Technology
• Inventors: Amer, Ayman, Shehri, Ali, Parrott, Brian
• Granted Patent: US 10,139,372 B1
• Time in Patent Office: Days
• CPC Class Codes: B64C 39/024 of the remote controlled vehicle type, i.e. RPV
• CPC Class Codes: B64U 10/17 Helicopters flying platforms B64U10/13
• CPC Class Codes: B64U 2101/30 for imaging, photography or videography
• CPC Class Codes: G01J 2005/0077 Imaging
• CPC Class Codes: G01J 5/10 using electric radiation detectors
• CPC Class Codes: G01N 17/02 Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
• CPC Class Codes: G01N 21/3504 for analysing gases, e.g. multi-gas analysis
• CPC Class Codes: G01N 21/954 Inspecting the inner surface of hollow bodies, e.g. bores
• CPC Class Codes: G01N 25/72 Investigating presence of flaws
• CPC Class Codes: G01N 27/00 Investigating or analysing materials by the use of electric, electrochemical, or magnetic means G01N3/00 – G01N25/00 take precedence; measurement or testing of electric or magnetic variables or of electric or magnetic properties of materials G01R
• CPC Class Codes: G01N 27/90 using eddy currents
• CPC Class Codes: G01N 27/9006 Details, e.g. in the structure or functioning of sensors

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.

Claims

1. A method for detecting corrosion under insulation within insulated equipment using at least one device supporting an infrared detector and at least one pulsed eddy current (PEC) sensor, the method comprising:

detecting, at one or more locations along the insulated equipment with the infrared detector, infrared waves emitted from the insulated equipment;

developing, using the infrared waves detected by the infrared detector, at least one image of an inner surface of the insulated equipment at the one or more locations based on the detected infrared waves;

determining, using a processor configured by code executing therein, at least one area that is susceptible to corrosion under insulation based on the at least one developed image;

storing positioning data corresponding to the at least one susceptible area in a database;

returning the device to the at least one susceptible area based on the stored positioning data;

inspecting, with the at least one PEC sensor, the at least one susceptible area on the insulated equipment, wherein the step of inspecting comprises;

generating a magnetic field,

penetrating a metallic jacket of the insulated equipment with the generated magnetic field to magnetize an inner wall of the equipment, thereby inducing an eddy current in the inner wall, and

monitoring a decay in strength of the eddy current over time; and

determining, using the processor configured by code executing therein, whether any corrosion under insulation exists at the at least one susceptible area based on a rate of the decay in strength of the eddy current.

2. The method of claim 1, further comprising the step of:

testing the one or more locations along the insulated equipment using an infrared gas detector operatively connected to the device, for gas emissions indicative of corrosion under insulation.

3. The method of claim 1, wherein the at least one device is an unmanned aerial vehicle.

4. The method of claim 3, wherein the unmanned aerial vehicle includes aerial and ground locomotive capabilities.

5. The method of claim 1, wherein the at least one device is selected from the group consisting of an unmanned aerial vehicle, a control station, a mobile robot, and a handheld device.

6. The method of claim 1, wherein the positioning data is global positioning data.

7. The method of claim 1, wherein the positioning data is relative positioning data.

8. The method of claim 1, further comprising the step of:

implementing a quiescent period after detection of the insulated equipment with the infrared detector and prior to inspection of the susceptible area with the at least one PEC sensor.

9. A method for detecting corrosion under insulation within insulated equipment using at least one modular unmanned aerial vehicle (UAV) having aerial and ground locomotive capabilities, the method comprising:

installing an infrared module on the at least one UAV, wherein the infrared module comprises an infrared detector;

positioning the UAV on the insulated equipment;

detecting, at one or more locations along the insulated equipment with the infrared detector, infrared waves emitted from the insulated equipment;

developing, using the infrared waves detected by the infrared detector, at least one image of an inner surface of the insulated equipment at the one or more locations based on the detected infrared waves;

determining, using a processor configured by code executing therein, at least one area that is susceptible to corrosion under insulation based on the at least one developed image;

installing a pulsed eddy current (PEC) module on the at least one UAV, wherein the PEC module comprises at least one PEC sensor;

inspecting, with the at least one PEC sensor, the at least one susceptible area on the insulated equipment, wherein the step of inspecting comprises;

generating a magnetic field,

penetrating a metallic jacket of the insulated equipment with the generated magnetic field to magnetize an inner wall of the equipment, thereby inducing an eddy current in the inner wall, and

monitoring a decay in strength of the eddy current over time; and

determining, using the processor configured by code executing therein, whether any corrosion under insulation exists at the at least one susceptible area based on a rate of the decay in strength of the eddy current.

10. The method of claim 9, further comprising the steps of:

storing positioning data corresponding to the at least one susceptible area in a database; and

returning the UAV to the at least one susceptible area based on the stored positioning data.

11. The method of claim 9, wherein the step of installing the PEC module comprises uninstalling the infrared module.

12. The method of claim 9, wherein the step of positioning the UAV comprises:

attaching the UAV to the insulated equipment via a clamping mechanism housed on the UAV.

13. The method of claim 9, further comprising the steps of:

installing an infrared gas module on the at least one UAV, wherein the infrared gas module comprises an infrared gas detector; and

testing the at least one location on the insulated equipment, using the infrared gas detector, for gas emissions indicative of corrosion under insulation.

14. The method of claim 9, further comprising the step of:

implementing a quiescent period after detection of the insulated equipment with the infrared detector and prior to inspection of the susceptible area with the at least one PEC sensor.

15. An autonomous, modular unmanned vehicle having aerial and ground locomotive capabilities for inspection of insulated equipment for corrosion under insulation, the vehicle comprising:

a controller, having a memory storing instructions in the form of code and a processor configured by executing the instructions therein, wherein the controller is configured to enable operations of the vehicle;

a power source configured to power all components of the vehicle;

an infrared module comprising an infrared detector, wherein the infrared detector is configured to detect infrared waves emitted from the insulated equipment and to develop an image of the inner wall of the insulated equipment at one or more locations based on the detected infrared waves, and wherein the infrared module is selectively removable from the vehicle;

a pulsed eddy current (PEC) module comprising at least one PEC sensor, wherein the at least one PEC sensor is configured to induce an eddy current in the inner wall and monitor a decay in strength of the eddy current over time, and wherein the PEC module is selectively removable from the vehicle;

a clamping mechanism configured to selectively attach the vehicle to the insulated equipment; and

at least one pair of wheels configured to move the vehicle along an outer surface of the insulated equipment when the vehicle is attached to the insulated equipment via the clamping mechanism.

16. The vehicle of claim 15, further comprising:

at least one of an infrared gas detector, a positioning module, a depth sensor, an inertia measurement unit, and a LIDAR device.

17. The vehicle of claim 15, wherein the power source is a battery.

18. The vehicle of claim 17, further comprising:

a power receiver operatively connected to the battery, wherein the power receiver is configured to wirelessly transfer power from a remote power source to the battery.

19. The vehicle of claim 15, wherein the at least one pair of wheels are configured to move the vehicle longitudinally along the outer surface of the insulated equipment.

20. The vehicle of claim 15, wherein the at least one pair of wheels are omniwheels configured to enable omnidirectional locomotion along the outer surface of the insulated equipment.

21. A system for inspection of insulated equipment for corrosion under insulation, comprising:

at least one autonomous, modular unmanned vehicle having aerial and ground locomotive capabilities, wherein the vehicle comprises;

a controller, having a memory storing instructions in the form of code and a processor configured by executing the instructions therein, wherein the controller is configured to enable operations of the vehicle,

a battery configured to power all components of the vehicle,

a power receiver operatively connected to the battery,

at least one of an infrared module and a pulsed eddy current (PEC) module, wherein the infrared module comprises an infrared detector configured to detect infrared waves emitted from the insulated equipment and to develop an image of the inner surface of the insulated equipment at one or more locations based on the detected infrared waves, and the infrared module is selectively removable from the vehicle, and wherein the PEC module comprises at least one PEC sensor configured to induce an eddy current in the inner wall and monitor a decay in strength of the eddy current over time, and the PEC module is selectively removable from the vehicle, and

a clamping mechanism configured to selectively attach the vehicle to the insulated equipment, and

at least one pair of wheels configured to move the vehicle along the equipment; and

a control station comprising a power source and a power transmitter, wherein the power transmitter is configured to wirelessly transfer power from the power source to the power receiver of the at least one vehicle.

22. The system of claim 21, wherein the at least one vehicle comprises a first vehicle comprising the infrared module and a second vehicle comprising the PEC module.