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Different solutions to inspect platform risers

Explore various methods for inspecting "unpiggable" risers in offshore platforms, from ultrasonics to tethered tools. Learn about operational conditions, defect detection, deployment examples, and upcoming challenges.

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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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