An offshore as-built project with on-shore checking.
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An offshore complex is surveyed and modelled using photogrammetry to ensure modifications achieve a first time fit. Zero re-work was the goal and was readily attained. Project managed by Gerard Hind.
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An offshore as-built project with on-shore checking.
- 1. M1 COMPLEX AS-BUILT FROM EXISTING DRAWING Vs AS-BUILT FROM PHOTOGRAMMETRY AND CONSEQUENCES ON DESIGN AND CLASHES Report presented to client By Gerard Hind Technical Director.
- 2. AS-BUILT MODEL FROM PHOTOGRAMMETRY HAS BEEN BASED ON THE FOLLOWING DATUM ALIGNMENT DATA PROVIDED BY CLIENT AS HARD COPY. M1DR M1PQ ELEVATION DATUM PLAN DATUM EXTRAPOLATED EXTRAPOLATED CENTRE LINE CENTRE LINE LEG HORIZONTAL MEMBER EAST 0 MM UP 10 000 MM NORTH 0 MM DATUM DIRECTION THESE TWO LEGS HAVE BEEN ALIGNED NORTH
- 3. GRAPHICAL VIEW SHOWING AS-BUILT FROM PHOTOGRAMMETRY OF M1DR
- 4. GRAPHICAL VIEW SHOWING AS-BUILT FROM PHOTOGRAMMETRY OF M1DR-M1PQ LINK BRIDGE
- 5. GRAPHICAL VIEW SHOWING AS-BUILT FROM PHOTOGRAMMETRY OF M1PQ
- 6. BASED ON THIS GLOBAL ALIGNMENT THE DISCREPANCIES BETWEEN DESIGN AS- BUILT PROVIDED BY CLIENT AND THE TRUE AS BUILT PROVIDED BY PHOTOGRAMMETRY CAN BE VISUALISED. RED = AS-BUILT CLIENT GREY = AS-BUILT PHOTO MIDR
- 7. RED = AS-BUILT CLIENT GREY = AS-BUILT PHOTO MODEL ALIGNED ON THESE AREAS
- 8. BASED ON THIS GLOBAL ALIGNMENT THE DISCREPANCIES BETWEEN DESIGN AS- BUILT PROVIDED BY CLIENT AND THE TRUE AS BUILT PROVIDED BY PHOTOGRAMMETRY CAN BE VISUALISED. RED = AS-BUILT CLIENT GREY = AS-BUILT PHOTO M1DR-M1PQ LINK BRIDGE
- 9. BASED ON THIS GLOBAL ALIGNMENT THE DISCREPANCIES BETWEEN DESIGN AS- BUILT PROVIDED BY CLIENT AND THE TRUE AS BUILT PROVIDED BY PHOTOGRAMMETRY CAN BE VISUALISED. RED = AS-BUILT CLIENT GREY = AS-BUILT PHOTO M1PQ
- 10. ALL THE PROCEEDING IMAGES ARE BASE ON GLOBAL ALIGNMENT BASE ON :- M1DR M1PQ ELEVATION DATUM PLAN DATUM EXTRAPOLATED EXTRAPOLATED CENTRE LINE CENTRE LINE LEG HORIZONTAL MEMBER EAST 0 MM UP 10 000 MM NORTH 0 MM DATUM DIRECTION THESE TWO LEGS HAVE BEEN ALIGNED NORTH
- 11. HOWEVER IF A LOCAL ALIGNMENT IS ASSUMED THEN THE DEFERENCE BETWEEN THE MODELS BECOMES MUCH MORE LESS – ALTHOUGH PLATFORM-TO- PLATFORM IS AS SURVEYED IT CAN BE DISPLAYED ON A LOCAL BASIS.THE CLIENT AS-BUILT MODEL IS DIMENSIONALLY INCORRECT
- 13. THIS TRUE ARRANGEMENT IS MAINTAINED AND THE AS- BUILT MODEL IS LOWERED UNTIL THIS FLOOR LEVEL IS LOCALLY ALIGNED
- 14. VIEW SHOWING M1DR LOCALLY ALIGNED TO CLIENT DESIGN MODEL RED = AS-BUILT CLIENT GREY = AS-BUILT PHOTO
- 15. VIEW SHOWING M1-BRIDGE LOCALLY ALIGNED TO CLIENT DESIGN MODEL RED = AS-BUILT CLIENT GREY = AS-BUILT PHOTO
- 16. RED = AS-BUILT CLIENT GREY = AS-BUILT PHOTO
- 17. FOR LOCAL ALIGNMENT OF M1PQ ALL OF THE PLATFORM REQUIRES TO BE MOVED AND WILL BE ALIGNED ON THESE 3 PLACES M1PQ ALIGNED ON 2 LEGS AND FLOOR CELLAR DECK TOP OF STEEL
- 18. VIEW SHOWING M1PQ LOCALLY ALIGNED TO CLIENT DESIGN MODEL
- 19. NOW THAT WE HAVE ALIGNED LOCALLY M1DR – BRIDGE –M1PQ A SAMPLE OF DESIGN ERRORS CAN BE VIEWED.
- 20. VIEW SHOWING (WHITE) AS BUILT MODEL (PHOTO) ALIGNED TO CLIENT (BLUE) DESIGN MODEL AND CLASHES CAN NOW BE EXAMINED. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT M1PQ PLATFORM
- 21. SUPPORT STRUCTURE CLASHES EXISTING INSTRUMENTATION WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 22. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 23. NEW CABLE TRAY CLASHES EXISTING WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 24. WHITE – AS-BUILT PHOTO NEW STRUCTURE CLASHES EXISTING BLUE – NEW DATA BY CLIENT
- 25. TIE-IN ERRORS WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 26. WHITE – AS-BUILT PHOTO NEW PIPE CLASHES EXISTING CABLE TRAY BLUE – NEW DATA BY CLIENT
- 27. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 28. WHITE – AS-BUILT PHOTO TIE-IN ERRORS BLUE – NEW DATA BY CLIENT
- 29. WHITE – AS-BUILT PHOTO NEW STRUCTURE CLASHES EXISTING BLUE – NEW DATA BY CLIENT
- 30. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 31. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 32. ALL OF THE CLASHES CAN EASILY BE IDENTIFIED BY:- ALIGNING THE CLIENT DESIGN MODEL TO THE REAL AS- BUILT LOCATION AND ORIENTATION OF THE M1PQ PLATFORM AND THEN USING PDMS CLASH DETECTION UTILITY TO PROCESS DESIGN DATA.
- 33. VIEW SHOWING (WHITE) AS BUILT MODEL (PHOTO) ALIGNED TO CLIENT (BLUE) DESIGN MODEL AND CLASHES CAN NOW BE EXAMINED. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 34. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT CLASHES TIE-IN ERROR
- 35. WHITE – AS-BUILT PHOTO TIE-IN ERROR BLUE – NEW DATA BY CLIENT
- 36. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT CLASHES
- 37. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT TIE-IN ERROR CLASH
- 38. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT CLASHES
- 39. WHITE – AS-BUILT PHOTO TIE-IN ERROR AND/OR CLASH BLUE – NEW DATA BY CLIENT
- 40. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 41. CLASHES WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
- 42. WHITE – AS-BUILT PHOTO TIE-IN ERRORS BLUE – NEW DATA BY CLIENT
- 43. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT TIE-IN ERROR
- 44. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT CLASHES
- 45. ALL OF THE CLASHES CAN EASILY BE IDENTIFIED BY:- ALIGNING THE CLIENT DESIGN MODEL TO THE REAL AS- BUILT LOCATION AND ORIENTATION OF THE M1DR PLATFORM AND BRIDGE AND THEN USING PDMS CLASH DETECTION UTILITY TO PROCESS DESIGN DATA.