Laser Scanner vs. Total Station
Subsea Survey & Positioning UK Ltd.
Wednesday 18th June 2014
Simon Canning
Dimensional Control Manager
THSiS & SUT Subsea Metrology Seminar 2014
Laser Scanner vs. Total Station
• Introduction
• Project Introduction
• Project & Scope of Work
• DC Survey Overview – Total Station
• DC Survey Overview – Laser Scanner
• Results & Cross Correlation
• What Next?
Content
Laser Scanner vs. Total Station – Introduction
Damaged field architecture was recovered from the seabed
• Banff P1 Production Riser Base
• Banff P2 Production Riser Base
• Banff Gas Export Subsea Isolation Valve (SSIV)
• Banff Gas Injection Riser Base
• Kyle Production Riser Base
• Kyle SSIV
• Kyle Umbilical Riser Base
• 68m 6” Rigid Gas Injection Spool
• 47m 8” Rigid Production Spool
Laser Scanner vs. Total Station – Introduction
Purpose of DC Survey?
Install Structures in Design Position
Install Structures in Design Orientation
Determine As-installed Position
Determine As-installed Orientation
Determine As-installed Attitude
Determine Hub to Hub HD
Determine Hub to Hub VD
Determine Hub P&R&HDG
Design & Manufacture Rigid Spools
Laser Scanner vs. Total Station – Project Scope of Work
What we need to know about all 7 structures?
Sensor & Hub XYZ offsets relative to the Common Reference Point (CRP)
• Positioning Aids
• Gyro
• Gyro/MRU
• Bullseye Bubble
• Centre of Hub Face
• Centre of Hub Boltholes
Positioning Compatt
Gyro & Gyro/MRU + Bullseye
CRP
+X Axis
Structure North +Y Axis
Laser Scanner vs. Total Station – Project Scope of Work
What else we need to know about all 7 structures?
Sensor & Hub orientation and attitude, relative to structure north, and the
horizontal & vertical planes
• Gyro Mounting – P&R & HDG
• Gyro/MRU – P&R & HDG
• Bullseye Bubble – P&R & HDG
• Hub Face – P&HDG
• Hub Bolthole Rotations
Laser Scanner vs. Total Station
Structures were re-furbished ready to be re-installed on the seabed in
the design orientation and position
Positioning
Aid
Bullseye
Bubble
Bullseye
Bubble
MRU & Ring Laser
Gyro
Laser Scanner vs. Total Station – Project Scope of Work
Dimensional Control Survey Scope
• Accuracy & Precision Requirement
• XYZ Offsets – 0.010m
• XYZ Angular Rotations – 0.05°
• Trimble S8 Precise Total Station
• Distance – 1mm + 1ppm
• Angular – 1”
• FARO Focus 3D
• Distance – 2mm
Laser Scanner vs. Total Station – DC Survey Overview – Total Station
• Trimble S8 Precise Total Station
• Surveyed Discrete Points With a Mini Prism
• Define the CRP and Z Datum
• Define XYZ Offsets & Rotations
• Basic Point Coding
• Process Using SC4W Software
• Shift & Rotate Survey Data
• Extract Coordinates Directly for Offsets
• Extract Coordinates & Calculate Pitch & Roll
• Extract Coordinates & Calculate Headings
• Extract Coordinates for Bolthole Rotations
Laser Scanner vs. Total Station – DC Survey Overview – Laser Scanner
• FARO Focus 3D
• Surveyed Millions of Points
• ~15 Scan Positions per Structure
• Spheres & Checker Board Targets
• Process Using FARO SCENE
• Automated Cleaning Routines
• Register Scans
• Process Using Trimble RealWorks
• Shift & Rotate Survey Data
• Extract Coordinates Directly for Offsets
• Extract Pitch & Roll Directly from Planes
• Extract Headings Directly from Planes
• Export to CAD for Bolthole Rotations
Laser Scanner vs. Total Station – Results & Cross Correlation
Banff P1 Production Riser Base
Trimble S8 FARO Focus 3D Δ Values
Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor Δ X Offset
(m)
Δ Y Offset
(m)
Δ Z Offset
(m)
Male Stab Plate (Top
Surface) -0.667 -0.859 4.19
Male Stab Plate (Top
Surface) -0.672 -0.854 4.196
Male Stab Plate (Top
Surface) 0.005 -0.005 -0.006
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.667 -0.729 4.65
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.659 -0.724 4.646
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.008 -0.005 0.004
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
-0.657 -0.499 5.262
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
-0.652 -0.492 5.259
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
-0.005 -0.007 0.003
Bullseye Bubble
(Bottom Surface) 0.213 -0.878 4.165
Bullseye Bubble
(Bottom Surface) 0.21 -0.872 4.173
Bullseye Bubble
(Bottom Surface) 0.003 -0.006 -0.008
System C-O Value
(DD) System
C-O Value
(DD) System
Δ C-O Value
(DD)
Male Stab Plate HDG -90.04 Male Stab Plate HDG -90.00 Male Stab Plate HDG -0.041
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.08
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.05
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.035
Bullseye Bubble 0 Bullseye Bubble 0.01 Bullseye Bubble -0.006
System Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Δ Pitch C-O
Value (DD)
Δ Roll C-O
Value (DD)
Male Stab Plate -0.18 -0.24 Male Stab Plate -0.20 -0.26 Male Stab Plate 0.024 0.019
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.43 -0.47
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.41 -0.50
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.018 0.027
Bullseye Bubble -0.17 0.34 Bullseye Bubble -0.16 0.31 Bullseye Bubble -0.011 0.029
Laser Scanner vs. Total Station – Results & Cross Correlation
Banff P2 Production Riser Base
Trimble S8 FARO Focus 3D Δ Values
Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor Δ X Offset
(m)
Δ Y Offset
(m)
Δ Z Offset
(m)
Male Stab Plate (Top
Surface) -0.646 -0.858 4.194
Male Stab Plate (Top
Surface) -0.652 -0.85 4.192
Male Stab Plate (Top
Surface) 0.006 -0.008 0.002
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.646 -0.728 4.654
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.65 -0.733 4.643
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
0.004 0.005 0.011
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
-0.646 -0.491 5.261
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
-0.653 -0.484 5.27
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
0.007 -0.007 -0.009
Bullseye Bubble
(Bottom Surface) 0.267 -0.872 4.173
Bullseye Bubble
(Bottom Surface) 0.259 -0.878 4.184
Bullseye Bubble
(Bottom Surface) 0.008 0.006 -0.011
System C-O Value
(DD) System
C-O Value
(DD) System
Δ C-O Value
(DD)
Male Stab Plate HDG -89.58 Male Stab Plate HDG -89.60 Male Stab Plate HDG 0.016
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.47
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.50
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
-0.033
Bullseye Bubble 0 Bullseye Bubble -0.05 Bullseye Bubble 0.05
System Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Δ Pitch C-O
Value (DD)
Δ Roll C-O
Value (DD)
Male Stab Plate -0.53 0 Male Stab Plate -0.50 0.03 Male Stab Plate -0.029 -0.032
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
-0.09 -0.61
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
-0.11 -0.57
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.023 -0.041
Bullseye Bubble -0.2 0.05 Bullseye Bubble -0.23 0.01 Bullseye Bubble 0.033 0.039
Laser Scanner vs. Total Station – Results & Cross Correlation
Banff Gas Injection Riser Base
Trimble S8 FARO Focus 3D Δ Values
Sensor X Offset
(m)
Y Offset
(m)
Z Offset
(m) Sensor
X Offset
(m)
Y Offset
(m)
Z Offset
(m) Sensor
Δ X Offset
(m)
Δ Y Offset
(m)
Δ Z Offset
(m)
Male Stab Plate (Top
Surface) -0.69 -0.763 4.188
Male Stab Plate (Top
Surface) -0.679 -0.772 4.185
Male Stab Plate (Top
Surface) -0.011 0.009 0.003
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.687 -0.78 5.206
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.682 -0.785 5.206
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.005 0.005 0
Bullseye Bubble
(Bottom Surface) 0.224 -0.84 4.164
Bullseye Bubble
(Bottom Surface) 0.216 -0.846 4.153
Bullseye Bubble
(Bottom Surface) 0.008 0.006 0.011
System C-O Value
(DD) System
C-O Value
(DD) System
Δ C-O
Value (DD)
Male Stab Plate HDG -90.05 Male Stab Plate HDG -90.09 Male Stab Plate HDG 0.036
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
179.65
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
179.67
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
-0.018
Bullseye Bubble 0 Bullseye Bubble -0.05 Bullseye Bubble 0.05
System Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Δ Pitch C-
O Value
(DD)
Δ Roll C-O
Value (DD)
Male Stab Plate -0.5 -0.62 Male Stab Plate -0.53 -0.66 Male Stab Plate 0.034 0.043
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
-1.4 -0.47
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
-1.37 -0.44
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
-0.028 -0.026
Bullseye Bubble -0.31 0.13 Bullseye Bubble -0.35 0.08 Bullseye Bubble 0.041 0.048
Laser Scanner vs. Total Station – Results & Cross Correlation
Banff Gas Export Subsea Isolation Valve (SSIV)
Trimble S8 FARO Focus 3D Δ Values
Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor Δ X Offset
(m)
Δ Y Offset
(m)
Δ Z Offset
(m)
Male Stab Plate (Top
Surface) -0.025 0.482 2.997
Male Stab Plate (Top
Surface) -0.027 0.476 3.005
Male Stab Plate (Top
Surface) 0.002 0.006 -0.008
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.025 0.612 3.457
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.036 0.606 3.455
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
0.011 0.006 0.002
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
-0.018 0.827 4.08
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
-0.009 0.82 4.087
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
-0.009 0.007 -0.007
Bullseye Bubble
(Bottom Surface) -0.068 -0.584 2.981
Bullseye Bubble
(Bottom Surface) -0.057 -0.592 2.975
Bullseye Bubble
(Bottom Surface) -0.011 0.008 0.006
System C-O Value
(DD) System
C-O Value
(DD) System
Δ C-O Value
(DD)
Male Stab Plate HDG -90.94 Male Stab Plate HDG -90.99 Male Stab Plate HDG 0.05
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.93
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.90
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.027
Bullseye Bubble 0 Bullseye Bubble 0.04 Bullseye Bubble -0.038
System Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Δ Pitch C-O
Value (DD)
Δ Roll C-O
Value (DD)
Male Stab Plate 0.15 0.02 Male Stab Plate 0.14 0.05 Male Stab Plate 0.014 -0.031
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.58 0.48
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.57 0.44
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.013 0.043
Bullseye Bubble 0.18 -0.11 Bullseye Bubble 0.15 -0.13 Bullseye Bubble 0.033 0.017
Laser Scanner vs. Total Station – Results & Cross Correlation
Kyle Umbilical Riser Base
Trimble S8 FARO Focus 3D Δ Values
Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor Δ X Offset
(m)
Δ Y Offset
(m)
Δ Z Offset
(m)
Male Stab Plate (Top
Surface) -1.898 1.714 0.785
Male Stab Plate (Top
Surface) -1.904 1.722 0.783
Male Stab Plate (Top
Surface) 0.006 -0.008 0.002
Sonardyne Lodestar
Subsea AHRS x1 - s/n 272938-002
-1.768 1.714 1.245
Sonardyne Lodestar
Subsea AHRS x1 - s/n 272938-002
-1.774 1.712 1.234
Sonardyne Lodestar
Subsea AHRS x1 - s/n 272938-002
0.006 0.002 0.011
Sonardyne MK5
Compatt x1 - s/n
215457-003 (ID - 000173
/ ADD – 106 / HPR -
B65)
-1.527 1.713 1.864
Sonardyne MK5
Compatt x1 - s/n
215457-003 (ID - 000173
/ ADD – 106 / HPR -
B65)
-1.52 1.722 1.871
Sonardyne MK5
Compatt x1 - s/n
215457-003 (ID - 000173
/ ADD – 106 / HPR -
B65)
-0.007 -0.009 -0.007
Sonardyne MK5
Compatt x2 - s/n 238678-007 (ID - 000685 / ADD –
603 / HPR - B15)
0.006 0 4.296
Sonardyne MK5
Compatt x2 - s/n 238678-007 (ID - 000685 / ADD –
603 / HPR - B15)
-0.002 0.001 4.3
Sonardyne MK5
Compatt x2 - s/n 238678-007 (ID - 000685 / ADD –
603 / HPR - B15)
0.008 -0.001 -0.004
Bullseye Bubble
(Bottom Surface) -2.696 1.707 0.767
Bullseye Bubble
(Bottom Surface) -2.704 1.704 0.764
Bullseye Bubble
(Bottom Surface) 0.008 0.003 0.003
System C-O Value
(DD) System
C-O Value
(DD) System
Δ C-O Value
(DD)
Male Stab Plate HDG 0.21 Male Stab Plate HDG 0.19 Male Stab Plate HDG 0.025
Sonardyne Lodestar
Subsea AHRS x1 - s/n 272938-002
-90.54
Sonardyne Lodestar
Subsea AHRS x1 - s/n 272938-002
-90.57
Sonardyne Lodestar
Subsea AHRS x1 - s/n 272938-002
0.031
Bullseye Bubble -315 Bullseye Bubble -315.04 Bullseye Bubble 0.043
System Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Δ Pitch C-O
Value (DD)
Δ Roll C-O
Value (DD)
Male Stab Plate HDG -0.02 0.09 Male Stab Plate HDG -0.06 0.10 Male Stab Plate HDG 0.041 -0.013
Sonardyne Lodestar
Subsea AHRS x1 - s/n 272938-002
0.79 0.49
Sonardyne Lodestar
Subsea AHRS x1 - s/n 272938-002
0.76 0.46
Sonardyne Lodestar
Subsea AHRS x1 - s/n 272938-002
0.034 0.031
Bullseye Bubble 0.09 0.14 Bullseye Bubble 0.08 0.09 Bullseye Bubble 0.009 0.051
Laser Scanner vs. Total Station – Results & Cross Correlation
Kyle SSIV
Trimble S8 FARO Focus 3D Δ Values
Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor Δ X Offset
(m)
Δ Y Offset
(m)
Δ Z Offset
(m)
Male Stab Plate (Top
Surface) 2.513 -1.84 3.487
Male Stab Plate (Top
Surface) 2.507 -1.843 3.491
Male Stab Plate (Top
Surface) 0.006 0.003 -0.004
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
2.513 -1.71 3.947
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
2.521 -1.707 3.952
Sonardyne Lodestar
Subsea AHRS – s/n 273071-002
-0.008 -0.003 -0.005
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
2.51 -1.495 4.572
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
2.505 -1.507 4.574
Sonardyne MK5
Compatt - s/n 241756-002 (ID - 000A5C / ADD - 805 / HPR - B12)
0.005 0.012 -0.002
Bullseye Bubble
(Bottom Surface) 2.508 -2.651 3.533
Bullseye Bubble
(Bottom Surface) 2.504 -2.66 3.526
Bullseye Bubble
(Bottom Surface) 0.004 0.009 0.007
System C-O Value
(DD) System
C-O Value
(DD) System
Δ C-O Value
(DD)
Male Stab Plate HDG -89.26 Male Stab Plate HDG -89.27 Male Stab Plate HDG 0.013
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
2.55
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
2.52
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.029
Bullseye Bubble 0 Bullseye Bubble -0.04 Bullseye Bubble 0.037
System Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Δ Pitch C-O
Value (DD)
Δ Roll C-O
Value (DD)
Male Stab Plate 0.13 0 Male Stab Plate 0.16 0.03 Male Stab Plate -0.033 -0.031
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.32 1.84
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.30 1.80
Sonardyne Lodestar
Subsea AHRS – s/n
273071-002
0.024 0.038
Bullseye Bubble -0.12 -0.09 Bullseye Bubble -0.13 -0.11 Bullseye Bubble 0.013 0.019
Laser Scanner vs. Total Station – Results & Cross Correlation
Kyle Production Riser Base
Trimble S8 FARO Focus 3D Δ Values
Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor X Offset (m) Y Offset (m) Z Offset (m) Sensor Δ X Offset
(m)
Δ Y Offset
(m)
Δ Z Offset
(m)
Male Stab Plate (Top
Surface) -3.016 1.5 0.788
Male Stab Plate (Top
Surface) -3.022 1.508 0.786
Male Stab Plate (Top
Surface) 0.006 -0.008 0.002
Sonardyne Lodestar
Subsea AHRS - s/n 3453-SX-GC-01-069
-2.886 1.5 1.248
Sonardyne Lodestar
Subsea AHRS - s/n 3453-SX-GC-01-069
-2.892 1.498 1.237
Sonardyne Lodestar
Subsea AHRS - s/n 3453-SX-GC-01-069
0.006 0.002 0.011
Sonardyne MK5
Compatt - s/n 245688-010 (ID - 000E63 / ADD -
609 / HPR - B25)
-2.661 1.503 1.879
Sonardyne MK5
Compatt - s/n 245688-010 (ID - 000E63 / ADD -
609 / HPR - B25)
-2.654 1.512 1.886
Sonardyne MK5
Compatt - s/n 245688-010 (ID - 000E63 / ADD -
609 / HPR - B25)
-0.007 -0.009 -0.007
Northern Compatt
Bridle Pad Eye -1.631 1.381 3.884
Northern Compatt
Bridle Pad Eye -1.639 1.382 3.888
Northern Compatt
Bridle Pad Eye 0.008 -0.001 -0.004
Southern Compatt
Bridle Pad Eye -1.639 -1.414 3.876
Southern Compatt
Bridle Pad Eye -1.647 -1.417 3.873
Southern Compatt
Bridle Pad Eye 0.008 0.003 0.003
Bullseye Bubble
(Bottom Surface) -3.814 1.492 0.769
Bullseye Bubble
(Bottom Surface) -3.817 1.484 0.774
Bullseye Bubble
(Bottom Surface) 0.003 0.008 -0.005
System C-O Value
(DD) System
C-O Value
(DD) System
Δ C-O Value
(DD)
Male Stab Plate HDG -359.52 Male Stab Plate HDG -359.55 Male Stab Plate HDG 0.025
Sonardyne Lodestar
Subsea AHRS - s/n 3453-SX-GC-01-069
-89.4
Sonardyne Lodestar
Subsea AHRS - s/n 3453-SX-GC-01-069
-89.43
Sonardyne Lodestar
Subsea AHRS - s/n 3453-SX-GC-01-069
0.031
Bullseye Bubble -315 Bullseye Bubble -315.04 Bullseye Bubble 0.043
System Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Pitch C-O
Value (DD)
Roll C-O
Value (DD) System
Δ Pitch C-O
Value (DD)
Δ Roll C-O
Value (DD)
Male Stab Plate HDG 0.1 0.17 Male Stab Plate HDG 0.06 0.18 Male Stab Plate HDG 0.041 -0.013
Sonardyne Lodestar
Subsea AHRS - s/n 3453-SX-GC-01-069
-0.92 0.68
Sonardyne Lodestar
Subsea AHRS - s/n 3453-SX-GC-01-069
-0.95 0.65
Sonardyne Lodestar
Subsea AHRS - s/n 3453-SX-GC-01-069
0.034 0.031
Bullseye Bubble 0 0 Bullseye Bubble -0.01 -0.05 Bullseye Bubble 0.009 0.051
Laser Scanner vs. Total Station – Results & Cross Correlation
Laser Scanner vs. Total Station
• Total Station is the baseline measure – Assumed to be the correct values
• Accuracy & Precision Requirement – XYZ Offsets – 0.010m, Angular Rotations – 0.05°
Offset Statistics Δ X Offset (m) Δ Y Offset (m) Δ Z Offset (m)
Max 0.010 0.012 0.009
Min -0.008 -0.009 -0.011
Mean 0.002 0.001 0.000
SD 0.007 0.006 0.006
Heading Statistics Δ C-O Value (DD)
Max 0.05
Min -0.04
Mean 0.02
SD 0.03
Pitch & Roll Statistics Δ Pitch C-O Value (DD) Δ Roll C-O Value (DD)
Max 0.04 0.05
Min -0.03 -0.04
Mean 0.02 0.01
SD 0.02 0.03
Laser Scanner vs. Total Station – Results & Cross Correlation
Laser Scanner vs. Total Station
• The results show that laser scanning is suitable for Dimensional Control surveys
• It is within the tolerances for this scope of work
• Accuracy & Precision Requirement – XYZ Offsets – 0.010m, Angular Rotations – 0.05°
Laser Scanner vs. Total Station – What Next
Laser Scanner vs. Total Station
• Design Spools
• 68m 6” Rigid Gas Injection Spool
• 47m 8” Rigid Production Spool
• Using the Position, Orientation & Attitude of
Structures & Thence Hub Faces Calculate
• As-installed P&HDG of Hub Faces
• As-installed Hub to Hub Horizontal
Distance
• As-installed Hub to Hub Vertical
Distance
Laser Scanner vs. Total Station – What Next
Laser Scanner vs. Total Station
• Manufacture Spools
• 68m 6” Rigid Gas Injection Spool
• 47m 8” Rigid Production Spool
• Using Laser Scanning – Check As-built vs.
Design
• P&HDG of Hub Faces
• Bolthole Rotation of Hub Faces
• Hub to Hub Horizontal Distance
• Hub to Hub Vertical Distance
Laser Scanner vs. Total Station – What Next
Laser Scanner vs. Total Station
• Using Laser Scanning – Check As-built vs.
Design
• P&HDG of Hub Faces
• Bolthole Rotation of Hub Faces
• Hub to Hub Horizontal Distance
• Hub to Hub Vertical Distance
Laser Scanner vs. Total Station – What Next
Laser Scanner vs. Total Station
• Using Laser Scanning – Check As-built vs.
Design
• P&HDG of Hub Faces –
• Bolthole Rotation of Hub Faces –
• Hub to Hub Horizontal Distance –
• Hub to Hub Vertical Distance –
• Install
Laser Scanner vs. Total Station - Conclusions
• Laser Scanners Can be Used for DC Survey
• DC Feeds As-installed Information
• DC Feeds Metrology Information
• DC Feeds Design & Engineering
• DC Checks Manufacturing
Many Thanks
Simon Canning MSc MRICS AMRI
Dimensional Control Manager
Mob; +44 (0) 7753 310716
Email; [email protected]