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. 1. M1 COMPLEX AS-BUILT FROM EXISTING DRAWING Vs AS-BUILT FROM PHOTOGRAMMETRY ANDCONSEQUENCES ON DESIGN AND CLASHES Report presented to client By Gerard Hind Technical Director.
  2. 2. AS-BUILT MODEL FROM PHOTOGRAMMETRY HAS BEEN BASED ON THE FOLLOWINGDATUM 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. 3. GRAPHICAL VIEW SHOWING AS-BUILT FROM PHOTOGRAMMETRY OF M1DR
  4. 4. GRAPHICAL VIEW SHOWING AS-BUILT FROM PHOTOGRAMMETRY OF M1DR-M1PQ LINK BRIDGE
  5. 5. GRAPHICAL VIEW SHOWING AS-BUILT FROM PHOTOGRAMMETRY OF M1PQ
  6. 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 CLIENTGREY = AS-BUILT PHOTO MIDR
  7. 7. RED = AS-BUILT CLIENT GREY = AS-BUILT PHOTOMODEL ALIGNED ON THESE AREAS
  8. 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 CLIENTGREY = AS-BUILT PHOTO M1DR-M1PQ LINK BRIDGE
  9. 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 CLIENTGREY = AS-BUILT PHOTO M1PQ
  10. 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 MMDATUM DIRECTIONTHESE TWO LEGS HAVE BEENALIGNED NORTH
  11. 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
  12. 12.  ALIGNMENT OF M1DR AND M1PQ PLATFORMS M1DR – MOVE ALL NEW SITES UP BY 835.18 MM    M1PQ ALIGNMENT MOVEMENT AND ROTATIONS  ALL NEW SITESMOVE BY U 784.84MOVE BY E 307.78MOVE BY N 482.04 ALL NEW SITES ROTATE      
  13. 13. THIS TRUEARRANGEMENT ISMAINTAINED AND THE AS-BUILT MODEL ISLOWERED UNTIL THISFLOOR LEVEL ISLOCALLY ALIGNED
  14. 14. VIEW SHOWING M1DR LOCALLY ALIGNED TO CLIENT DESIGN MODELRED = AS-BUILT CLIENTGREY = AS-BUILT PHOTO
  15. 15. VIEW SHOWING M1-BRIDGE LOCALLY ALIGNED TO CLIENT DESIGN MODELRED = AS-BUILT CLIENTGREY = AS-BUILT PHOTO
  16. 16. RED = AS-BUILT CLIENTGREY = AS-BUILT PHOTO
  17. 17. FOR LOCAL ALIGNMENT OF M1PQ ALL OF THE PLATFORM REQUIRES TO BE MOVED AND WILL BE ALIGNED ON THESE 3 PLACESM1PQ ALIGNED ON 2 LEGS AND FLOOR CELLAR DECK TOP OF STEEL
  18. 18. VIEW SHOWING M1PQ LOCALLY ALIGNED TO CLIENT DESIGN MODEL
  19. 19. NOW THAT WE HAVE ALIGNED LOCALLY M1DR – BRIDGE –M1PQA SAMPLE OF DESIGN ERRORS CAN BE VIEWED.
  20. 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. 21. SUPPORT STRUCTURE CLASHES EXISTING INSTRUMENTATIONWHITE – AS-BUILT PHOTOBLUE – NEW DATA BY CLIENT
  22. 22. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
  23. 23. NEW CABLE TRAY CLASHES EXISTING WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
  24. 24. WHITE – AS-BUILT PHOTONEW STRUCTURE CLASHES EXISTING BLUE – NEW DATA BY CLIENT
  25. 25. TIE-IN ERRORS WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
  26. 26. WHITE – AS-BUILT PHOTONEW PIPE CLASHES EXISTING CABLE TRAY BLUE – NEW DATA BY CLIENT
  27. 27. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
  28. 28. WHITE – AS-BUILT PHOTOTIE-IN ERRORS BLUE – NEW DATA BY CLIENT
  29. 29. WHITE – AS-BUILT PHOTONEW STRUCTURE CLASHES EXISTING BLUE – NEW DATA BY CLIENT
  30. 30. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
  31. 31. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
  32. 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 M1PQPLATFORM AND THEN USING PDMS CLASH DETECTIONUTILITY TO PROCESS DESIGN DATA.
  33. 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. 34. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENTCLASHES TIE-IN ERROR
  35. 35. WHITE – AS-BUILT PHOTOTIE-IN ERROR BLUE – NEW DATA BY CLIENT
  36. 36. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENTCLASHES
  37. 37. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENTTIE-IN ERROR CLASH
  38. 38. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENTCLASHES
  39. 39. WHITE – AS-BUILT PHOTOTIE-IN ERROR AND/OR CLASH BLUE – NEW DATA BY CLIENT
  40. 40. TIE-IN ERROR WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
  41. 41. CLASHES WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENT
  42. 42. WHITE – AS-BUILT PHOTOTIE-IN ERRORS BLUE – NEW DATA BY CLIENT
  43. 43. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENTTIE-IN ERROR
  44. 44. WHITE – AS-BUILT PHOTO BLUE – NEW DATA BY CLIENTCLASHES
  45. 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 M1DRPLATFORM AND BRIDGE AND THEN USING PDMS CLASHDETECTION UTILITY TO PROCESS DESIGN DATA.

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