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Transcript of Engineering measurements from subsea laser … brett...Engineering measurements from subsea laser...
![Page 1: Engineering measurements from subsea laser … brett...Engineering measurements from subsea laser scanning Data gathering and analysis Presented by Brett Lestrange, Regional Director](https://reader031.fdocuments.us/reader031/viewer/2022022517/5b09a2f77f8b9a404d8e1ca3/html5/thumbnails/1.jpg)
Engineering measurements from subsea laser scanningData gathering and analysis
Presented by Brett Lestrange, Regional Director Europe
![Page 2: Engineering measurements from subsea laser … brett...Engineering measurements from subsea laser scanning Data gathering and analysis Presented by Brett Lestrange, Regional Director](https://reader031.fdocuments.us/reader031/viewer/2022022517/5b09a2f77f8b9a404d8e1ca3/html5/thumbnails/2.jpg)
Introduction
• There is a growing number of aging subsea assets in use today
• Repairs and modifications are required to prolong lifespan
• Engineering data for assets may be limited, or not available
• Ability to produce accurate “as is” engineering models is hugely beneficial
• Historically photogrammetry, sonar and physicalmeasurements have been employed subsea tocollect engineering data
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Laser scanning applications
• Modelling of subsea components
• Spool Metrology
• Pipeline damage inspection
• Inspection of wear on subsea components
• Structural corrosion monitoring
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Subsea lasers
• An increasing number of laser systems are available for subsea use
• The two most common types of subsea laser scanners Triangulation Time of Flight (TOF)
• All subsea lasers face similar challenges Mobilisation Subsea Data collection Data processing Report generation
• Laser scanning creates an almost instant3D point cloud representation of an objects surface features
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Benefits of subsea laser scanning
• Non contact measurement
• Scanned area data available in seconds
• Diver or ROV deployed
• Ultra High Resolution data
• Sub millimetre measurement capability
• Data can be converted to CAD models for measurement and analysis
Image of surface corrosion
Meshed scanned data
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Subsea laser scanning constraints
• Good visibility is essential
• Poor visibility will result in increased noise within the data
• High reflectivity within the scan creates noise within the data
• Maximum range for triangulation laser systems is typically 10m
• Ambient light causes reduced laser line detection
• Overall accuracy of the data decreases with range
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Example laser scanning project
• Wellhead laser inspection
• Well-bay laser inspection
• Diver deployment
• 110m water depth
• Less than 24hr inspection time
• Sub millimetre data analysis
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Project planning and deliverable requirements
• Clearly defined measurement requirements
• A “Scan Plan” is essential to ensure coverage
• Agreed reporting format
• Project specific system integration
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Typical diver deployment configurationSubsea equipment including laser scanner,
pan & tilt multiplexer
Subsea laser scanner
Surface equipment including control software and multiplexer console
Control laptop
Multiplexer topside
150m power and fibre communications umbilical
Multiplexer subsea bottle
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Final Acceptance Test (FAT)
Subsea deployment mock up Computer suite
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Data processing (noise)
• Noisy data requires filtering
• Noise from turbidity
• Noise from reflections
• Initial noise is filtered through software
• Final filtering performed manually
• Differing processing requirements from topside laser scanning
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Processed data (noise)
Before noise filtering After noise filtering
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Data processing (scan registration)
• Multiple scans stitched together
• Co-locating features between scans (REGISTRATION)
• Registration targets may be employed
• Initial manual feature selection
• Software automatically aligns selected features
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Processed data set
• Registration targets removed during processing
• CAD models can be created from the processed data
Meshed data set CAD model
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Example measurements
Unrolled heat map
Deformation analysis
• Comparison between the scanned data and the CAD model• Measurements in millimetres
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Example measurements
• Horizontal deformation
• Vertical deformation
• Ovality analysis
Horizontal section Vertical section
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Summary
• An emerging subsea technology • Specialised personnel are required
to deliver results• Subsea laser scanning requires a
different skillset to that for topside scanning
• Deliverables must be clearly defined from the outset
• Detailed project preparation and FAT minimise offshore risks
• Scan data can provide critical sub millimetre measurements of subsea infrastructure
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Questions
Engineering measurements from subsea laser scanningData gathering and analysis