Learning Experience from West Leda - Sat diving platform project

1. WEST LEDA – SAT DIVING PLATFORMLearning experience By Ranjith Kumar & Kuldipak Pednekar

3. Name: West Leda

4. Owner: Seadrill

5. Type: Saturation diving

6. Name: S4 Sat system

8. Design philosophy Main chamber, HRC, Umbilical basket, Reclaim van, and Workshop to go on platform In case of emergency, HRC (diving rescue boat) to be launched in sea by using onboard crane Platform not to extend beyond anchor pocket arrangement Platform to be well above Anchor winch

9. ISO format minutes of onboard meeting with Rig master

11. Meeting at Cal Dive workshop Initial Preparation Summary of meeting General layout drawing showing all items of diving system 3D model prepared on basis of initial scope of work In case of emergency HRC have to have its own launching system Opening for HRC to launch HRC launching davit with self powered winch arrangement Two more containers to be added Gas quads to be located on platform

12. ISO format minutes of the meeting conducted at Cal dive

15. Main deck structural drawingPARTIES PRESENT Seadrill ABS PPL shipyard Cybermarine

16. Information transmission

17. Information transmission Initial info received from client via email, same has been forwarded Minutes of meeting prepared and sent Design changes have been conveyed over phone Hand sketches made at site sent via email Drawings collected from client scanned and sent via email Photos clicked by phone sent via mobile network Maximum information collected and forwarded

18. Sample Hand sketches

19. Sample Concept hand sketches

20. Sample design philosophies

21. Information tracking Created hard copy of project file for easy reference All layout drawings, information collected in hard copy format, concepts hand sketches and design philosophies maintained in project file

22. Modifications done in initial stage

23. Interferences at site Interference of platform support bracings with vent pipe Interference of offloading hose with support bracing Interference of pipe with underdeck newly added web

24. Vent pipe interference

25. Pipe interference with Under deck web

26. Design Changes Overturning procedure Platform extension on offloading platform Introduction of HRC lifting spreader Collapsible beam design change Introduction of hydraulic ram arrangement and later same is canceled Umbilical basket location change Opening on platform for umbilical to pass Fixed platform for HRC outboard access HRC frame height increase Change in HRC launch opening

27. Design changes HRC leveling to match with flange on main chamber Collapsible foldable platform to access control panel on main chamber which was later changed to fixed platform New inboard platform to be added to access valves on reclaim van Introduction of Air diving system HRC pull out pad eye Container access platform modification Pad-eye reorientation on HRC lifting spreader Winch shifted on platform

28. Overturning procedure

29. Issues encountered

30. Incorrect details hrc frame pulley

31. Incorrect orientation of pulley on hrc frame Extension plate was provided on aft where as it was required on fwd side

32. Incorrect orientation of pad eye on hrc lifting spreader Top pad eye orientation has been changed to suit sheave assembly with hydraulic pin

33. Umbilical basket Wire lengths were different and drawing was not followed properly Issue was solved by using wire at correct location

34. Photo gallery

38. Platform waiting for sand blasting

41. bottom view of Hrc launch opening

42. Top of hrc

43. Collapsible beams with pin arrangement

44. HRC Pull-out pad eye

45. Hrc frame

46. Pulley on hrc frame

47. FIXED PLATFORM TO ACCESS PANEL door

48. Container access platform

49. Air diving system

50. Air diving launching pad eye

51. HRC lifting winch

52. Sheave on top of HRC lifting frame

53. HRC lifting hydraulic sheave

54. Thanks for your patience