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Different solutions to inspect platform risers

Different solutions to inspect platform risers. By: Robert van Agthoven (Part I) Manager Marketing & Sales PS-PIT Rotterdam, The Netherlands Charles Lawther (Part II) Technical Manager Offshore Business Unit Aberdeen, Scotland. Event: PPSA Seminar November 14th, 2007 Aberdeen.

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Different solutions to inspect platform risers

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  1. Different solutions to inspect platform risers By: Robert van Agthoven (Part I) Manager Marketing & Sales PS-PIT Rotterdam, The Netherlands Charles Lawther (Part II) Technical Manager Offshore Business Unit Aberdeen, Scotland Event: PPSA Seminar November 14th, 2007 Aberdeen

  2. Contents of the presentation • Focus on inspection of “unpiggable” risers • The operational conditions • Type of defects that can be detected • Travel capabilities and range of tethered tools • Deployment examples • Near future challenges • Other possibilities for non-intrusive inspections of risers in Part II of this presentation | 2

  3. Different “unpiggable” riser-lay-outs | 3

  4. Off-stream: Open access, allows internal inspection with tethered UT-tool, also where OD is not accessible (e.g. J-tube) Riser must be liquid filled for UT-inspection Liquid may be: crude oil, (sea) water, condensate For gas risers: use high-friction sealing pig and limited volume of water On-stream: Must be accessible from OD Requires diver or ROV assistance, Apply “screening” tool to assess general condition Inspection options & conditions Advantage: No shut-down required A screening tool called “Incotest“ will be explained in part II of this presentation Advantage: UT tools provide quantitative data | 4

  5. What can be detected with ultrasonics,using a tethered inspection tool? | 5

  6. Tethered vehicle capabilities | 6

  7. 100% circumferential coverage = MUST! Lay-out of ID surface 32 or 64 Fixed Ultrasonic sensors, Equidistantly divided 1 rotating sensor, # of measuring points programmable Lay-out of wall thickness Option #2 Option #1 | 7

  8. Deployment of Riser Inspection Tool | 8

  9. Near future challenges • SCR’s • TTR’s 2000 m water depth! | 9

  10. Conclusions - Part I • Today many solutions exist to inspect “unpiggable” risers • For diameters from 4-60”, distances up to 10 km. • Both gravity and self-propelled tools do not require liquid-handling or pumping, liquid remains stagnant • Accurate tool handling and positioning in vertical section, free-swimming ILI tool cannot stop and may go too fast. • Only short inspection window required (few hours) • Ultrasonics provide quantitative results with no wall thickness limitations • Reinforced tether adds to safety, tool can always be retrieved and allows on-line presentation of results. | 10

  11. Questions? After presentation of Part II by Charles Lawther | 11

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