GLSC // Global Leak Sealing Code

Composite Repair

Wrapping a weakened pipe in fibre composite instead of replacing it. This is the one area with a real standard of its own. And still the mistake often starts before the first layer, at the question of whether composite is even the right answer here.

Request consulting GLSC in the Veritas Library All methods

Definition

What composite repair is

In composite repair, a damaged or weakened pipe is wrapped in a fibre composite to restore or reinforce wall strength and load capacity. It is the only method in this series governed by dedicated standards, ISO 24817 and ASME PCC-2, Article 4.1.

Because a standard exists, the grey zone here is narrower than for the other methods. It does not disappear though. It shifts from execution to the fundamental question: is this wrap a repair or only a time bridge until replacement.

The grey zone

Repair or time bridge

The standard says how a laminate is designed, applied and tested. It does not say whether composite is the right solution for this defect and this service or whether replacement is due. That classification is often skipped in the sale.

Composite is frequently sold as permanent even though, depending on defect type and design life, it is a time bridge. Naming the honest, calculated life to ISO 24817 rather than promising permanence is the real professional standard. FRALEX makes that classification mandatory.

Decision logic

The six questions before the first layer

Even with a standard behind you, six questions precede the wrap, and their answers are documented.

1. Defect type: leaking or not

ISO 24817 distinguishes non leaking defects with wall loss from leaking defects. The type governs design, admissibility and whether composite is suitable at all.

2. Substrate and surface preparation

Adhesion is everything. Surface condition, roughness and cleanliness must meet the standard, otherwise even the best laminate will not hold.

3. Temperature and medium compatibility

Operating temperature and medium must match the resin system. A laminate wrong for the condition fails gradually, not visibly at once.

4. Design life to ISO 24817

A calculated, honest life instead of a blanket permanent. Design follows the standard, not the wish.

5. Repair or time bridge

Is composite the final solution here or does it bridge until replacement. That classification belongs in the release, not in the fine print.

6. Documentation and verifiability

Design calculation, batches, cure and acceptance must be traceable. Without that chain the wrap cannot be reliably assessed.

Normative frame

The relevant reference documents

ISO 24817Composite repairs for pipework. Design, qualification, application

ASME PCC-2, Art. 4.1Nonmetallic composite repair systems for pressure equipment

ASME B31.3 / EN 13480Design frame of the base pipe

API 570Condition assessment of the in service line

FRALEX GLSCThe decision layer above them. Repair or time bridge

Here a real code exists, and still the decisive question remains a decision, not a formula. Integrity is a decision, not a material property.

FAQ

Common questions

Short, reliable answers on composite repair. The full design and decision logic is in the GLSC in the Veritas Library.

Wrapping a weakened or damaged pipe in a fibre composite to restore or reinforce load capacity. Governed by ISO 24817 and ASME PCC-2, Article 4.1.

Both are possible. Depending on defect type and design life, a wrap is a permanent repair or a time bridge until replacement. The honest classification belongs in the release.

The governing references are ISO 24817 and ASME PCC-2, Article 4.1. The design frame of the base pipe comes from ASME B31.3 or EN 13480.

ISO 24817 covers both non leaking and leaking defects with different design requirements. The defect type decides admissibility and design.

Composite restores wall load capacity. Online leak sealing contains an existing leak without removing the leak path. Composite can be a repair, online leak sealing is always a time bridge.

With unsuitable substrate or surface condition, temperature or medium incompatibility of the resin, or when the defect demands replacement. Then the wrap is the wrong answer.