Overview
EN ISO 12736-1:2023 (ISO 12736-1:2023) defines requirements for the validation of wet thermal insulation systems used on pipelines and subsea equipment in the oil and gas industries - including lower carbon energy applications. It applies specifically to insulation systems submerged in seawater and focuses on validating materials and full insulation systems rather than project-specific installation or maintenance. This Part 1 is the validation-focused element of the ISO 12736 series and supersedes ISO 12736:2014.
Key topics and technical requirements
- Scope and exclusions
- Applicable to wet thermal insulation submerged in seawater.
- Not applicable to maintenance of existing systems, anti-corrosion coating qualification, or insulation in pipe-in-pipe annulus.
- Material classes
- Introduces material classification to guide validation testing and performance expectations.
- Validation testing
- Material validation testing: small-scale exposure tests and standardized physical property tests (references include ISO 34-1/34-2, ISO 37, ISO 178, ISO 179-1, ISO 527, ISO 604).
- System validation testing: full-scale test programs, small-scale full-system exposure tests, and tests addressing system interfaces and repairs.
- Performance parameters
- Detailed thermal conductivity testing (Annex B) and mechanical tests such as hydrostatic compressive/tri-axial tests (Annex C), simulated bend (Annex D), shear resistance (Annex E), impact (Annex F), and simulated service tests for pipelines and subsea equipment (Annexes G, H).
- Long-term performance and risk
- Requires validation of long-term performance and a risk-based analysis of system longevity.
- Deliverables
- A technical validation dossier detailing test programs, results and justification for system deployment.
Practical applications
- Demonstrates material suitability and system reliability for subsea and submerged pipeline insulation.
- Supports design, procurement, and acceptance of wet thermal insulation systems by providing standardized validation evidence.
- Helps operators and suppliers mitigate operational risks related to thermal performance, mechanical damage, and degradation in seawater environments.
Who should use this standard
- Insulation system manufacturers and material suppliers
- Pipeline and subsea equipment designers and integrators
- Operators and asset owners in oil, gas and lower-carbon subsea projects
- Certification bodies and testing laboratories performing validation and acceptance testing
Related standards
- Other parts of the ISO 12736 series (Parts 2 and 3) and the normative material-test standards cited within (e.g., ISO 34, ISO 37, ISO 527).
- Adopted by CEN as EN ISO 12736-1:2023 and intended for implementation across European national standards bodies.
Keywords: wet thermal insulation systems, pipelines, subsea equipment, validation, ISO 12736-1, thermal conductivity, material validation, system testing, long-term performance.