Stride JIP: Steel Risers in Deepwater Environments – Progress Summary

Event:
Stride JIP: Steel Risers in Deepwater Environments – Progress Summary
Date:
May 1999
Author:
N. Willis, R. Thethi

The STRIDE JIP has performed test initiatives into several areas considered to be crucial to the design of steel catenary risers for harsh, deepwater environments. The following investigations are described:

  • Water-tank testing of a ¼” diameter x 100ft long catenary riser model, looking at response to production vessel motions, in particular the response in the touchdown region for rigid and elastic seabed simulations.
  • Vortex induced vibration tests on riser models 20ft long, 6” in diameter, in simulated currents up to 16.5 ft/s (5m/s – Reynolds 6.7×105 ). Helical straked and bare pipe models were towed at angles of up to 45o to the flow, simulating current flow over non-vertical riser sections of simple catenary and buoyant wave risers. The requirement and effectiveness of strakes on inclined sections was investigated.
  • Vortex induced vibration tests on riser strings 650ft long, 10.75” diameter in simulated currents up to 5.8 knots (3m/s – Reynolds 6×105 ). Helical straked and bare pipe models were towed at angles of up to 75o to the vertical in a Norwegian Fjord between two tugs, continuing the investigation into non-vertical riser response to high currents.

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