Tri-Strakes® Combi
Tri-Strakes® Lite
Tri-Strakes® Lite uses overlapping interlocking mouldings with three-start helical strakes to reduce vortex induced vibration. It is lightweight, stackable and cost-effective, enabling fast installation.
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Tri-Strakes® Stinger
Tri-Strakes® Stinger is a vortex induced vibration (VIV) suppression system designed for deepwater steel catenary risers and flowlines, reducing fatigue damage caused by vortex shedding and improving long-term pipeline performance.
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AIS is a global leader in the engineering, manufacture and application of insulation and passive fire protection systems, as well as buoyancy and SURF (subsea, umbilicals, risers and flowlines) products.
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Tri-Strakes® Combi

Vortex induced vibration protection for pipelines

Tri-Strakes® Combi is a Vortex Induced Vibration (VIV) suppression system designed to protect free spanning pipelines and risers from vortex induced vibration, reducing fatigue and preventing failures in steel flowlines and catenary risers. Tri-Strakes® Combi combines the stackability of the Tri-Strakes® Lite with the load resilience of the Tri-Stakes® Stinger.

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Benefits

Efficient VIV suppression for offshore pipelines

Tri-Strakes® Combi uses overlapping interlocking polyurethane mouldings with three-start helical strakes to reduce vortex induced vibration. It provides impact and abrasion resistance, improves handling and enables faster installation while maintaining long-term structural integrity in offshore pipeline and riser applications.

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VIV reduction
Reduces vortex induced vibration in unsupported free spans of pipelines and risers, preventing fatigue damage such as girth weld failure and improving long-term structural performance offshore.
Fast installation
Lightweight hinged components allow quick pre-installation onshore or offshore installation, with efficient stacking design that reduces handling time and improves deployment efficiency in subsea environments.
Impact protection
Manufactured from marine grade polyurethane, providing impact and abrasion resistance while maintaining an effective VIV suppression profile for long-term subsea durability in harsh offshore conditions.

Specifications

Applications

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AIS receives its seventh King’s Award for Enterprise
The award for innovation was for our cable protection system, NjordGuard.
Offshore wind
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October 23, 2026
The new AIS website is now live
With a fresh look and simple navigation, we are pleased to announce that the new AIS website is now live.
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October 1, 2026
AIS completes acquisition of Matrix Composites & Engineering
Marking the next phase of its growth strategy, AIS is delighted to announce that it has received all necessary approvals and completed the acquisition of Matrix Composites & Engineering, a leading Australian provider of advanced composite materials and subsea engineering solutions.
Subsea
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July 23, 2026
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