Intervention Riser System (IRS)

IRS Integral Dual BoreOil States’ first high-pressure Merlin® intervention riser was designed and supplied in the 1990’s and is still in operation. With the design evolving, we now have 10K and 15K variants that meet NACE for 10,000-foot applications. They offer superior fatigue resistance and, because the makeup is non-rotational, hard annulus lines can be utilized.

See completion workover riser animation here.

Sales Contacts

Email +44 1224 290 000

Key Features

  • High-pressure intervention riser.
  • 10K option ISO 13628-7 approved.
  • Multiple break-out capability for problem-free installation and retrieval of riser joints.
  • Proven gas-tight connection after 150 make and breaks.
  • Tension, fatigue and bending tests completed.


  • Floating subsea intervention/workover riser
  • Landing string


  • Engineering
  • Fatigue monitoring
  • Life-cycle management
  • Inspection
  • Maintenance
  • Bespoke testing