ROV Inspection Powerpoint

Remotely Operated Vehicle Inspection and Maintenance Systems : 

Remotely Operated Vehicle Inspection and Maintenance Systems 6401 Carmel Road, Suite 209 Charlotte, North Carolina 28226 T: 704-540-9777 F: 704-540-7707

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Outline: Review “Diverless” Remote Systems utilized by Glenn Underwater Services, Inc. on similar projects; Identify Potential for Remote Technology to be utilized on Hydroelectric Dams; Adaptability of same technology for inspection and maintenance on non-underwater components and structures at facilities worldwide. Presentation Overview 7/26/2010 2

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Penstocks Tunnels Intake Gates Spillway Gates Upstream Dam Face Downstream Toe of Dam & Powerhouse Trash Racks Structures where Remote Technology has been utilized by Glenn Underwater Services, Inc. 7/26/2010 3

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Benefits of Remote Technology 7/26/2010 4 Minimize high risk exposure to divers; Quicker mobilization; Eliminate confined space and lockout / tagout permitting; Does not require floating equipment; Reduced amount of support personnel required per event.

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ROV’s Provide Controlled Inspection Platforms 7/26/2010 5

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Example Projects Using Remote Technology by Glenn Underwater Services, Inc. 7/26/2010 6

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Hydroelectric Dam ROV Visual Inspection supplemented by Acoustical Positioning and NDT Data 7/26/2010 7 Inspection Objectives: Verify the general condition of the steel surfaces of the 5 penstocks, joints, and supporting structures; Obtain thickness readings of the steel surfaces of the penstocks and provide exact location data; Observe operation of butterfly valves. Logistical Constraints: 1,200 foot - long tunnel penetration; Entry through Surge Shaft.

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Access to Penstocks through Surge Tank Vent Shaft 7/26/2010 8 Access for ROV

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Inspection Performed Utilizing ROV with Acoustical Positioning and Remote UT Gauge 7/26/2010 9

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Acoustical Positioning Inside Penstock 7/26/2010 10

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Hydroelectric Dam ROV Inspection of Upstream Face of Dam Using Acoustical Positioning for Defect Mapping 7/26/2010 11 Inspection Objectives: Inspect entire upstream face of dam and gate house; Map all horizontal and vertical joints; Locate and map all cracks and defects; Logistical Constraints: Depth of water – 221 feet; Surface area to inspect – 226,200 sq. ft.

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7/26/2010 12 Equipment: Remotely Operated Vehicle ROV w / 2,000 feet of tether; Long Range Acoustical Positioning System; Computer Aided Data Recorder. Remote Equipment and Instrumentation Utilized for This Project

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7/26/2010 13 Acoustical Positioning System Utilized for Defect Mapping

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7/26/2010 14 ROV with Acoustical Positioning System ROV Unit Transponder Transponder Transponder

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7/26/2010 15 Final CADD Drawing Showing Joints and Cracks Mapped by ROV

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7/26/2010 16 Defect Mapping & Remote Crack Monitoring Remote U/W LVDT Sensor for Crack Monitoring

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7/26/2010 17 Underwater Inspection of Headworks at Hydroelectric Dam

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Guri Dam – Venezuela, South America ROV Inspection / Defect Mapping and Remote Cleaning of Intake Structure 7/26/2010 18 Inspection Objectives: To determine the condition of the concrete surfaces of the sealing face at each intake portal; Evaluate condition of gate guides (focus on poor concrete grout behind guides); Logistical Constraints: Depth of water – 360 feet. Surface area to inspect – 720,000 sq. ft.

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7/26/2010 19 Equipment: Remotely Operated Vehicle ROV w / 2,000 feet of tether; Long Range Acoustical Positioning System; Computer Aided Data Recorder; Remote cleaning system. Remote Equipment and Instrumentation Utilized for This Project

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Hydroelectric Dam – United States ROV Inspection / Defect Mapping and Leak Detection of Surge Tank Shaft 7/26/2010 20 Inspection Objectives: To locate areas of leakage in concrete lined section of surge shaft; Map and define cracking; Condition Survey of steel lined section of shaft. Logistical Constraints: Depth of water – 950 feet. Only Access through opening at top of surge tank.

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Special Remote Equipment on ROV 7/26/2010 21 Equipment: Dye Release with actuator at Pilots Control; Black light to enhance view of red dye entering area of leakage; Positioning system to track vehicles radial position; Altimeter to document ROV’s vertical position.

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Limited Crew Requirements 7/26/2010 22

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Hydroelectric Dam – United States 7/26/2010 23 Inspection Objectives: Catastrophic event caused a failure in the penstock and butterfly valve and flooded the intake building; Determine structural integrity of building and condition of equipment. Logistical Constraints: Depth of water – 175 feet; Flooded intake building; Unknown condition of structure and equipment.

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ROV Operation 7/26/2010 24

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Objectives of Remote “Diverless” Technology 7/26/2010 29 Remove the diver from areas of potential hazard; Provide system that will collect data to the same level of accuracy as the diver; Make the remote systems universal and adaptable to all facilities worldwide both above and below the waterline; Develop technology that will reduce future inspection costs; Utilize systems at multiple facilities under same “Owner” to generate revenue back to principle “Owner”; Adapt advanced data and information catalog system.

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Design and Construction of Remote Technology 7/26/2010 30 System designed to fit all inspection criteria: Dye release for leak detection; Dual function manipulator to detect and seal leaks; Long tether and adequate power for the inspection of intake tunnels and penstocks; Positioning system for mapping of defects; Sonar for profiling and navigation.

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Profiling Sonar 7/26/2010 31

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Data Management & Archiving 7/26/2010 32

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Tunnel Inspection Data 7/26/2010 34

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CAD of Tunnel Inspection 7/26/2010 35

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Safety - Safety - Safety “Your cost savings really begin past 60 – feet, especially at depths greater than 100 feet where a decompression chamber and depth pay are required for the divers. The biggest savings involves SAFETY . . . Let the ROV identify the hazards during its investigation and not the diver.” In Conclusion 7/26/2010 36