Overview
ISO 15741:2016 - Paints and varnishes - Friction-reduction coatings for the interior of on- and offshore steel pipelines for non-corrosive gases - defines requirements and test methods for liquid epoxy paints and their internal application in steel pipes and fittings used to convey non‑corrosive gas. The standard covers material qualification, coating application (normally shop‑applied, single‑layer on blast‑cleaned steel by airless spray or equivalent), production control, handling, storage and repair. The cured film must be smooth to achieve the intended friction‑reduction performance; brush application is limited to small repairs.
Key topics and technical requirements
- Coating material qualifications: non‑volatile matter (mass/volume), viscosity, density, ash (residue on ignition), pot life, infrared spectrograms and appearance.
- Cured film properties: dry film thickness (DFT), adhesion, Buchholz hardness, resistance to neutral salt spray, artificial ageing, bend (conical mandrel) test, resistance to gas pressure variations, water immersion, chemicals and hydraulic blistering.
- Application and surface preparation: specification for blast‑cleaned steel (surface cleanliness and profile), paint preparation and recommended spray techniques.
- Production control and inspection: on‑pipe and panel assessments (appearance, DFT, adhesion, hardness, porosity, curing tests) and documentation (product data sheet, qualification and batch test certificates).
- Logistics and QA: packaging, labelling, storage, handling, transportation, loading of coated pipes and repair procedures.
- Normative test annexes: procedures for ash determination, DFT measurement, gas pressure variation, hydraulic blistering, porosity, curing and wet‑sponge testing.
Applications and practical value
- Internal pipeline coatings to reduce frictional losses, improving flow efficiency and reducing compressor/pumping energy in onshore and offshore gas pipelines.
- Temporary corrosion protection during pipe storage and transport plus long‑term lining for non‑corrosive gas service.
- Guidance for shop application of single‑layer epoxy systems to ensure consistent performance, reproducibility and inspectability across pipeline projects.
- Supports specification and acceptance criteria useful to owners, contractors and coating suppliers to avoid disputes and ensure fitness for service.
Who should use ISO 15741:2016
- Pipeline owners, EPC contractors and operators in oil & gas and utility sectors
- Coating manufacturers and formulators of epoxy internal linings
- Fabricators, applicators and shop coating facilities
- Coating inspectors, third‑party certifiers and design consultants
Related standards
ISO 2409; ISO 2811; ISO 2812‑1/2; ISO 2815; ISO 3233‑1; ISO 3251; ISO 6860; ISO 8501‑1; ISO 8503‑1/2; ISO 9227; ISO 19840:2012 - referenced for specific test methods, surface preparation and corrosion/resistance testing.