Overview
EN ISO 18796-1:2020 - Petroleum, petrochemicals and natural gas industries - Internal coating and lining of carbon steel process vessels - Part 1: Technical requirements - specifies minimum technical requirements for internal coating and lining systems applied to carbon steel process vessels used in the oil & gas and petrochemical industries. The standard covers new construction, maintenance, and repair of coatings and linings for vessels subjected to significant pressure/temperature changes, corrosive service and aggressive chemicals. It also defines acceptance criteria for coated/lined samples and approval procedures.
Key Topics
The document addresses practical and technical topics that control coating performance and long-term integrity:
- Scope and conformance: application to carbon steel process vessels and requirements for compliance.
- Pre-work requirements and safety: confined-space entry, flammable atmosphere precautions, isolation and ventilation for blasting/coating work.
- Materials and approvals: qualification of coating/lining materials, material approvals, and requirements for procedure qualification trials (PQT) and pre‑production trials (PPT).
- Surface preparation: cleaning, patching, dry abrasive blasting, humidity control and after-blast cleaning to achieve specified surface profiles.
- Coating/lining application: primer use (including holding/blast primers), environmental condition limits, application methods and thickness classifications for coating systems.
- Inspection and testing: inspection of materials and equipment, compressed air and abrasive quality, surface preparation inspection, holiday detection, film thickness measurement, curing tests and adhesion testing.
- Quality assurance and documentation: work proposals, inspection/test reporting, final reports and standardized data sheets for coating/lining records.
Applications and Who Uses It
EN ISO 18796-1:2020 is intended for organizations and professionals involved in the specification, application and verification of internal coatings and linings in process vessels:
- Asset owners & operators in petroleum, petrochemical and natural gas facilities who require durable corrosion protection.
- Coating specifiers and engineers developing system requirements and acceptance criteria.
- Contractors and applicators performing surface preparation, coating/lining application and testing.
- QA/QC and inspection personnel conducting PQT/PPT, film-thickness checks, holiday testing, adhesion tests and documentation.
- Fabricators and maintenance teams performing rehabilitation and repair of defective or deteriorated coatings.
Related Standards
For comprehensive program development, pair EN ISO 18796-1:2020 with standards covering surface preparation methods, test procedures (film thickness, holiday detection, adhesion), and workplace safety guidance from ISO/CEN and industry bodies. These complementary documents help ensure consistent application, inspection and record-keeping for internal coating and lining systems.
Keywords: EN ISO 18796-1:2020, internal coating and lining, carbon steel process vessels, petroleum petrochemicals natural gas, surface preparation, inspection and testing, procedure qualification trial, holiday detection.
