Corrosion Prevention: Methods & Solutions

The decision point changes fundamentally once measurable wall loss, pitting, or localised defects appear. At this stage, the integrity assessment must transition from corrosion control to structural rehabilitation.

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Consequences of Unchecked Corrosion

For integrity engineers and technical authorities, corrosion is ultimately a load-bearing problem:

• Reduction in pressure containment capacity
• Lower allowable operating pressures (MAOP downgrade)
• Increased inspection frequency and escalating RBI risk ranking
• Unplanned outages and environmental release events
• Regulatory exposure

In high-temperature systems, corrosion can combine with creep and thermal cycling. In offshore environments, chloride exposure accelerates degradation. In buried systems, soil resistivity and microbiological activity influence kinetics unpredictably.

The engineering question becomes: How do you restore structural capacity while isolating the substrate from further attack?

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Traditional Structural Repair Methods

Where corrosion has resulted in significant wall loss, traditional intervention includes:

The gap in the market: What if you need structural rehabilitation without hot work, without extended downtime, and with corrosion isolation built in?

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The Dual-Function Requirement

Effective rehabilitation of corroded assets requires two functions delivered simultaneously:

1. Environmental isolation — deny the corrosion cell access to electrolyte, oxygen, and moisture
2. Structural load sharing — redistribute hoop stress away from the degraded substrate

This dual function defines the transition from a coating to an engineered repair. Coatings provide the first. Only engineered composite systems provide both.

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What Is an Engineered Composite Wrap?

An engineered composite wrap consists of:

• A high-performance polymer matrix (typically epoxy-based)
• A fibre reinforcement (commonly E-glass or carbon fibre)
• A defined laminate architecture (specified ply orientation and thickness)

When applied to a prepared substrate, the fibre-reinforced polymer (FRP) laminate bonds to the steel surface and cures to form a rigid structural shell. Unlike conventional coatings, composite systems are designed with calculated laminate thickness, defined mechanical properties (modulus, tensile strength, shear strength), and controlled curing behaviour—all compliant with recognised engineering standards.

The composite does not simply cover corrosion. It participates in load sharing.

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Structural Reinforcement Mechanism

In pressurised cylindrical systems, hoop stress is the dominant stress component.

Where corrosion reduces wall thickness (t), hoop stress increases. An engineered composite wrap redistributes stress by:

• Bonding to the steel substrate
• Increasing effective section thickness
• Carrying a defined proportion of the hoop load
• Reducing stress concentration around defects (pits, thinned areas)

Load transfer occurs via interfacial shear between steel and composite. For properly designed systems, the composite laminate assumes part of the pressure-induced stress, effectively restoring the pressure capacity of the degraded section.

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Barrier Protection Function

Simultaneously, the cured composite laminate provides:

• Very low permeability to oxygen and water
• Chemical resistance to hydrocarbons, acids, and salts
• Complete electrolyte isolation of the substrate

By removing electrolyte access, the corrosion cell is interrupted and further degradation arrested.

Composite wraps are therefore a single solution that delivers both:

1. A structural reinforcement system (restoring load-bearing capacity)
2. A corrosion isolation barrier (arresting further degradation)

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Defect Types Addressed

Composite repair systems are used to rehabilitate:

• Uniform wall thinning
• External corrosion
• Internal corrosion (after process-side arrest or conservative estimates on defect growth)
• Pitting and localised defects
• Through-wall defects (with appropriate leak-sealing methodology)
• Erosion-corrosion zones

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Design Standards and Engineering Basis

Engineering design is performed in accordance with internationally recognised standards:

• ISO 24817 — Composite repairs for pipework
• ASME PCC-2 — Repair of pressure equipment and piping

These standards define:

• Defect assessment methodology
• Laminate thickness calculation
• Design factors and safety margins
• Long-term performance considerations
• Qualification testing requirements

The result is a calculated repair with documented engineering justification—not an improvised patch.

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Advantages Over Traditional Methods

Limitations

Composite systems do not replace cathodic protection in buried systems, nor do they eliminate the need for sound corrosion management practices. They are not a substitute for material replacement where degradation is complete. They are a rehabilitation pathway—designed, calculated, and applied where conventional coatings alone are insufficient but replacement is not yet justified.

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Engineered composite systems must be selected based on operating temperature, environmental exposure, defect type, and required design life. Glass transition temperature (Tg), mechanical modulus, chemical resistance, and curing behaviour are the critical parameters.

Icarus Composites provides a temperature-stratified portfolio of ISO 24817 and ASME PCC-2 compliant systems, enabling engineers to select the appropriate laminate for the service envelope.

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Ambient Temperature Systems (Up to ~82°C)

BioWrap 102™ — Structural Reinforcement for General Service

For water systems, hydrocarbon lines, storage tanks, and general process piping operating in moderate temperature environments.

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Applications: External corrosion, uniform wall thinning, localised pitting, tank shell degradation, atmospheric and marine exposure.

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Elevated Temperature Systems (Up to ~138°C)

Helios 158™ — For High-Temperature Process Piping

For steam tracing, hot process fluids, refinery lines, and industrial systems where resin thermal stability becomes critical.

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Key capability: Maintains stiffness at elevated temperatures; resists thermal softening; withstands thermal cycling.

Applications: High-temperature corrosion zones, steam lines, refinery process piping, chemical plant equipment.

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Ultra-High Temperature Systems (Up to ~203°C)

Hyperion 223™ — For Severe Thermal and Chemical Service

For refinery, power generation, and chemical processing environments where extreme thermal exposure is continuous.

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Note: Proper post-curing is required to achieve maximum Tg and thermo-mechanical stability.

Applications: Steam systems, high-temperature hydrocarbons, refinery units, power generation process piping, thermal cycling environments.

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Subsea and Splash-Zone Systems

Oceanus 142™ — Water-Activated Composite Repair

For environments where corrosion exposure is continuous and electrolyte presence cannot be eliminated during application.

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Applications: Subsea pipelines, caissons, marine infrastructure, potable water systems, splash-zone rehabilitation.

Key advantage: Water-activated prepreg format enables rapid deployment in environments where mixing conventional epoxies is impractical.

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Preventative Systems (Non-Structural)

Not every corrosion application requires ISO 24817 design calculations.

UV-Curing FRP Shield

For assets where there is no significant wall loss and the objective is purely environmental isolation and mechanical protection.

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Typical applications: Atmospheric corrosion protection, pipe racks and structural steel, insulation terminations, localised coating repair, protection of vulnerable geometries.

Important distinction: Where wall loss exceeds allowable limits, or where pressure containment must be restored, an engineered composite repair system designed to ISO 24817 or ASME PCC-2 is required. Barrier systems prevent corrosion progression. Engineered systems prevent corrosion and restore structural integrity.

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Supporting Systems

PVC Outer Wrap — Mechanical Protection Layer

Flexible PVC tapes with pressure-sensitive rubber adhesive, designed as a mechanical protection layer over corrosion-preventive coatings.

• Impact, abrasion, and chemical resistance; UV resistant
• Applied with 50% overlap manually or via tape wrapping machine
• Application temperature: 0°C to +60°C
• Does not contribute to pressure containment

Viscoelastic Anticorrosion Tape — Primary Barrier Layer

Solid polyolefin-based compound designed as the primary corrosion-preventing inner layer, adhering directly to steel and existing coatings.

• Void-free conformable seal; self-healing behaviour
• Eliminates oxygen and moisture ingress
• Excellent resistance to aggressive soils and acids
• Applications: Girth weld rehabilitation, flange encapsulation, underground repairs
• No structural contribution

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Portfolio Summary: Matching System to Environment

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Selecting the appropriate corrosion prevention or rehabilitation strategy requires balancing electrochemical control, structural integrity, operational constraints, and whole-life cost. No single solution is universally optimal.

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Decision Factors

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Consolidated Decision Matrix

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Engineering Interpretation

• Preventative systems are appropriate where no structural degradation exists
• Structural systems are required once wall loss affects integrity
• Replacement is reserved for end-of-life or non-repairable assets

Composite systems occupy a unique position: cold-applied, structurally reinforcing, corrosion-isolating, and low-disruption—making them particularly suitable for ageing infrastructure where shutdown is not feasible and where both integrity restoration and corrosion arrest are required.

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Effective corrosion protection requires more than material selection. It requires a controlled engineering and execution process. The Icarus approach follows three stages.

Stage 1: Consultation and Data Collection

Asset data is gathered to define the problem accurately:

• Inspection reports (UT, MPI, visual)
• Operating conditions (pressure, temperature, cyclic loading)
• Defect sizing and characterisation
• Access constraints and geometry assessment

This ensures the repair strategy is based on verified asset condition—not assumptions.

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Stage 2: Engineered Design

Repair calculations are performed in accordance with ISO 24817 and ASME PCC-2 methodologies, producing:

• Repair specifications and laminate thickness design
• Material selection based on temperature and chemical environment
• Installation procedures and acceptance criteria

This transforms the repair from a field decision into a documented, defensible engineering solution.

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Stage 3: Certified Installation and QA/QC

Installation is carried out under controlled procedures, supported by:

• Surface preparation to recognised standards (typically Sa 2.5)
• QA/QC verification (laminate thickness, cure monitoring, adhesion testing)
• Full material traceability
• Completion documentation for integrity records

This ensures the installed system performs in line with the design assumptions and can be formally incorporated into your integrity management system.

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Corrosion is thermodynamically inevitable. Structural failure is not.

The distinction at the core of effective integrity management is clear:

• Barrier systems interrupt the corrosion process
• Engineered composite systems interrupt the corrosion process and restore load-bearing capacity

By combining environmental isolation with calculated structural reinforcement in accordance with ISO 24817 and ASME PCC-2, composite systems enable asset owners to extend service life without replacement, maintain operation without shutdown, and restore integrity with documented engineering justification.

While paint buys you time, engineering buys you certainty.

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Discuss Your Requirements

If you are responsible for critical infrastructure showing signs of corrosion, the next step is to define a solution that restores integrity, extends service life, and aligns with your operational constraints.

Our engineering team provides:

• Technical assessment of your corrosion challenge
• Standards-compliant design recommendations
• Material selection based on your operating environment

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