Underwater Pipeline Repair Without Shutdowns

Our engineered underwater pipeline repair systems allow damaged subsea pipelines to be repaired in-situ without shutdown, dewatering, or pipe replacement. Using diver-installed composite wraps and leak sealing technologies, we restore structural integrity, arrest corrosion, and regain pressure containment in the most demanding subsea environments. The result is a permanent, standards-compliant repair that extends asset life while minimising risk, downtime, and cost.

  • Diver-Installed Repairs Without Shutdown
  • Engineered Composite Systems Certified to ISO 24817 & ASME PCC-2
  • Long-Term Corrosion Protection in Seawater & Subsea Environments
  • Rapid Deployment to Minimise Downtime, Risk & Environmental Exposure
Explore our repair solutions

Certified Quality & Standards-Compliant Engineering

All underwater pipeline repairs are delivered under an ISO 9001-certified quality management system and engineered in accordance with ISO 24817 and ASME PCC-2. This ensures every repair is fully traceable, auditable, and designed to meet the expectations of operators, insurers, and regulators.

‍

The Most Reliable Composite Repair Solution for Submerged & Subsea Pipelines

Diver-Installed Repairs Without Shutdown

Our underwater composite repair systems are designed for direct diver installation, allowing pipelines to be repaired in-situ while remaining fully operational—eliminating the need for shutdowns, cofferdams, or costly dewatering.

Engineered Composite Systems Certified to ISO 24817 & ASME PCC-2

Each repair is engineered, calculated, and installed in full compliance with ISO 24817 and ASME PCC-2, ensuring predictable structural performance, pressure containment, and long-term integrity underwater.

Long-Term Corrosion Protection in Seawater & Subsea Environments

The composite systems form a fully encapsulated, impermeable barrier that isolates the substrate from seawater, oxygen, and chlorides, arresting active corrosion and preventing further metal loss.

Rapid Deployment to Minimise Downtime, Risk & Environmental Exposure

Lightweight, modular repair materials enable fast mobilisation and installation by small dive teams, reducing offshore time, safety exposure, and the risk of environmental release.

Engineered Composite Wrap Systems for Subsea Pipelines

Our composite wrap systems are structurally engineered to restore hoop strength, axial capacity, and pressure containment on damaged subsea pipelines. By permanently reinforcing areas affected by corrosion, wall loss, or mechanical damage, the repair extends asset life, avoids pipe replacement, and reduces long-term integrity risk.

  • Restores pressure containment and structural capacity without pipe replacement.
  • Designed to accommodate subsea loads, temperature variation, and operational stresses.
  • Compatible with corroded, pitted, and irregular substrates following diver surface preparation.
  • Extends service life by decades while avoiding high CAPEX intervention.

Diver-Applied Leak Sealing & Pressure Containment Solutions

Icarus Composites provides diver-installable leak sealing solutions for both weeping and active leaks. These systems allow operators to regain pressure integrity rapidly, minimise product loss, and stabilise defects without interrupting operations or escalating the repair scope.

  • Enables rapid stabilisation of live, weeping, or low-rate leaks underwater.
  • Reduces product loss and environmental exposure during repair activities.
  • Eliminates the need for hot work, welding, or mechanical clamps offshore.
  • Allows permanent composite reinforcement to be applied immediately after sealing.

Corrosion Mitigation & Structural Reinforcement Below the Waterline

The composite systems create a continuous, bonded barrier that isolates steel substrates from seawater and oxygen while adding structural reinforcement. This dual function arrests ongoing corrosion and prevents further degradation, delivering predictable long-term protection in aggressive subsea environments.

  • Arrests active corrosion by isolating steel from seawater and oxygen.
  • Adds structural reinforcement to areas of localised wall loss or damage.
  • Provides a continuous, non-conductive barrier resistant to chlorides and marine fouling.
  • Reduces future inspection findings and integrity management interventions.

Turnkey Underwater Repair Design, Supply & Installation Support

From defect assessment and repair calculations to material supply, installation procedures, and quality documentation, Icarus Composites supports the full repair lifecycle. This reduces engineering burden on the asset owner, accelerates approval, and ensures underwater repairs are delivered safely, compliantly, and right-first-time.

  • Includes engineered repair calculations compliant with ISO 24817 & ASME PCC-2.
  • Provides diver-friendly installation procedures and tooling guidance.
  • Supplied with full QA/QC documentation for regulatory and operator approval.
  • Minimises internal engineering workload and accelerates repair execution.

Trusted by Asset Owners, Operators & Engineering Authorities

Underwater Pipeline Repair for Corrosion, Leaks & Mechanical Damage

Localised Corrosion & Wall Loss on Subsea Pipelines

Composite wrap repairs restore lost structural capacity and arrest corrosion, extending the service life of subsea pipelines without replacement or shutdown.

‍

Active & Weeping Leaks Below the Waterline

Diver-applied leak sealing stabilises live defects quickly, allowing pressure integrity to be regained while minimising environmental risk and operational disruption.

‍

Mechanical Damage from Anchors, Debris & External Impact

Structural composite reinforcement redistributes loads around damaged areas, preventing crack propagation and avoiding costly cut-and-replace interventions.

‍

Long-Term Integrity Restoration for Ageing Subsea Assets

Engineered composite repairs provide a permanent, standards-compliant solution that reduces inspection findings, maintenance frequency, and long-term integrity risk.

‍

Proven on Submerged Pipeline Assets in Challenging Environments

Excavated 6" River Water Line – Live Leak Seal & Composite Repair

An excavated 6" mild steel river water line supplying a critical fire hydrant was repaired live after severe external corrosion caused a through-wall defect and full isolation was not possible. Using a live leak seal followed by an engineered BioWrap 102 composite repair, the asset was restored to its original design pressure with a 20-year design life and no shutdown or pipe replacement required.

‍

view full case study

Field-Tested Composite Systems with Documented Long-Term Performance

Engineered Repairs Designed to International Standards

All underwater pipeline repairs are engineered and calculated in accordance with ISO 24817 and ASME PCC-2, ensuring predictable structural performance and pressure containment.

‍

Independently Tested Composite Systems

Our composite repair materials are validated through UKAS-accredited laboratory testing, providing independently verified performance data for underwater applications.

‍

Controlled Installation & Quality Assurance

Every repair is delivered under ISO 9001-certified quality processes with defined installation procedures, inspection hold points, and full documentation for audit and approval.

‍

Need a repair? Contact our Engineering Team today

Ready to add engineered composite wraps and live leak sealing to your service portfolio? Tell us about your business and we'll get in touch.


Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Prefer to speak to us directly?

Contact our team and we'll guide you step-by-step on the journey to getting your assets repaired.

Phone:

+44(0)1706 334178

Email:

contact@icarusgroup.co.uk

Website:

www.icaruscomposites.co.uk

Location:

Cambridge, United Kingdom

Frequently Asked Questions (FAQ)

Q.

Can underwater pipeline repairs be carried out on live, pressurised lines?

A.

Yes—engineered composite wraps and diver-applied leak sealing can be safely installed on live, pressurised underwater pipelines, avoiding shutdowns and dewatering where conditions allow. Underwater repairs are executed by trained dive teams using tactile installation techniques, controlled procedures, and predefined quality checks specifically developed to manage low-visibility and zero-visibility conditions.

Q.

Are composite repairs suitable for seawater and submerged environments?

A.

Yes—at Icarus Composites we utilise a combination of water-activated resins and specialised epoxies specifically formulated to cure underwater, enabling reliable subsea, splash zone, and fully submerged repairs. When applying our Oceanus 142 composite system, a hydrophobic epoxy bonding layer is first used to displace water from the substrate and promote effective adhesion. Once installed, the composite repair forms a corrosion-resistant, impermeable barrier that isolates the steel from seawater, oxygen, and chlorides, arresting further corrosion and degradation.

Q.

How long do underwater composite repairs last?

A.

When correctly engineered and installed, composite repairs provide a long-term solution with design lives of up to 20 years, supported by documented calculations, QA records, and warranties. The achievable design life is governed by the root cause of the defect; where the damage mechanism can be arrested, extended design lives can be assigned. For example, defects caused by external corrosion can often be given a 20-year design life, as the fully bonded composite wrap isolates the pipe from oxygen and moisture, preventing further degradation.

Q.

What types of defects can be repaired underwater?

A.

Underwater composite repairs are suitable for external corrosion, wall loss, through-wall defects (with leak sealing), and mechanical damage such as dents or impact damage.

Q.

Do underwater composite repairs comply with industry standards?

A.

Yes—all repairs are designed and executed in accordance with ISO 24817 and ASME PCC-2, with calculations, procedures, and QA/QC documentation provided.

Q.

How are underwater repairs installed and quality-controlled?

A.

Repairs are installed by trained dive teams following defined, engineered procedures, with surface preparation, laminate application, and inspection hold points controlled under ISO 9001-certified quality processes and aligned with ISO 24817 and ASME PCC-2 requirements. Where visibility allows, diver-worn cameras relay live footage to a topside control room, enabling supervisors to monitor installation, verify quality checks, and formally sign off each critical stage of the repair.

Book your pipe repair today
A trading division of icarus group ltd
Copyright © 2025 Icarus Group Ltd