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. | 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

3. | 3 Different unpiggable riser-lay-outs

4. | 4 Inspection options & conditions 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 Advantage: No shut-down required Advantage: UT tools provide quantitative data A screening tool called Incotest will be explained in part II of this presentation

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

6. | 6 Tethered vehicle capabilities

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

8. | 8 Deployment of Riser Inspection Tool

9. | 9 Near future challenges 2000 m water depth! SCRs TTRs

10. | 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.

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