Riser Repair - Structural and Pressure Containing


The repair had the following specifications:

Structure Riser
Surface Preparation Sa2.5
Technowrap Fibre

Carbon (triaxial)

Carbon (uniaxial)

Glass (triaxial)

Design Pressure 125bar
Design Temperature 80 °C
Design Life 20 years
Wrap / Repair Length 500mm
Corrosion Type External
Axial Loading 331kN
Bending Moment 143kNm
Design Code ISO 24817 & ASME B31.8


A 500mm NB gas riser on an offshore platform had experienced significant wall thinning due to external corrosion below the platform sea deck. A TechnowrapTM solution was provided which met the required standards of ASME B31.8 (gas transmission and distribution, as an AEA class 3 pipe repair) and ISO 24817 with structural loadings for axial and bending moment. The repair documentation included drawings, work method statement, detailed design and the typical ICR.IAS JV quality documentation.


  • Combination of TechnowrapTM fibres to deliver the structural requirements and minimise material and labour costs
  • Technowrap 2K™ LT system used to wrap all fibre types


  • ICR.IAS JV Repair register to track repair details
  • Local ICR.IAS JV engineering experience driving the scope
  • No hot work required to complete the repair
  • No shut-down required, maintaining platform productivity
  • Documented QA/QC procedures provide an excellent record of the repair materials and application process for future reference

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