Overview
EN ISO 23936-4:2024 (ISO 23936-4:2024) defines principles, requirements and recommended procedures for assessing the stability of fibre-reinforced composite materials used in oil and gas production environments. It covers comparative testing of composite systems made from thermoplastic and thermoset polymers reinforced with continuous fibres or woven fabrics (glass, carbon, aramid and metal fibres). The standard focuses on composite components such as non-metallic pipelines, piping, liners and downhole tool components, and establishes methods to evaluate short‑term, accelerated and long‑term material stability in contact with oil and gas production media.
Important exclusions: testing/characterization of neat resins and fibre products, blistering from rapid gas decompression (RGD), coatings, and particulate- or short‑fibre‑reinforced composites are outside the scope.
Key topics and technical requirements
- Comparative testing framework for fibre‑reinforced composites used in oil and gas service.
- Material property characterization (Level 1) - baseline properties and reporting requirements.
- Material stability evaluations:
- Level 2 (short‑term): test criteria, exposure temperatures, durations, fluids and threshold criteria.
- Level 3 (accelerated): higher temperatures and accelerated ageing procedures, evaluation and reporting rules.
- Level 4 (long‑term): guidance for extended service-life testing, threshold baselines and selection of test methods.
- Test specimen preparation and traceability: specimen identification, laminate fabrication quality control and validation of conformity.
- Quality assurance: requirements for plate fabrication, specimen extraction and documentation to ensure reproducible comparative tests.
- Property test methods and threshold criteria: mechanical, dimensional and other relevant property measurements after exposure to defined fluids and conditions.
- Annexes (normative and informative) provide detailed procedures: test media and equipment for ageing (Annex A), laminated plate fabrication (B), specimen extraction (C), quality control of laminates and UD‑tape (D), and thermomechanical evaluation guidance (E).
Practical applications and who uses this standard
This standard is essential for:
- Materials and mechanical engineers qualifying composite materials for oil, gas and lower‑carbon energy production equipment.
- Manufacturers of composite pipes, liners and downhole components needing validated comparative test data.
- Testing laboratories performing accelerated ageing, mechanical testing and certification.
- Operators, procurement and integrity teams specifying, comparing and approving non‑metallic components for service environments.
- Regulators and certification bodies assessing fitness‑for‑service claims for composite materials.
Related standards
- ISO 23936 series (this is Part 4) - use in conjunction with other parts of the ISO 23936 family and applicable industry standards for complete material selection and qualification strategies.
Keywords: fibre‑reinforced composite, oil and gas industries, non‑metallic materials, material stability testing, composite pipelines, thermoplastic composites, thermoset composites, accelerated ageing, long‑term stability.