EN ISO 18797-2:2021 specifies selection criteria and minimum requirements for maintenance and field‑repair coating systems used to provide external corrosion protection of riser pipes exposed to splash‑zone conditions in the petroleum, petrochemical and natural gas industries. It covers qualification, testing and application requirements for repair coatings but does not address methods to restore riser structural integrity or separate mechanical protective materials. New shop‑applied riser coatings are covered by ISO 18797-1; this part focuses on compatible maintenance and field repair coatings.
Keywords: ISO 18797-2:2021, riser coatings, external corrosion protection, field repair coatings, splash zone, maintenance coatings.
Key technical topics and requirements
- Selection criteria for repair coatings considering substrate condition, contamination (soluble salts, oil/grease, dust), wet substrates and compatibility with existing coatings.
- General requirements for client and contractor responsibilities, documentation, marking and conformity evaluation.
- Qualification and application procedures including APS (Application Procedure Specification), ITP (Inspection and Test Plan), procedure qualification trials and pre‑production trials.
- Inspection, testing and traceability: monitoring during production and site application, thickness testing, holiday detection and retest procedures.
- Operational performance: resistance to ageing, weathering, mechanical loads and interaction with cathodic protection systems.
- Specific coating families: the standard includes guidance for types such as non‑crystalline low‑viscosity polyolefin‑based coatings (identification, surface preparation, application and testing).
- Test programs and substrate conditions: defines test regimes, inspection frequencies and substrate scenarios used for testing.
Practical applications
- Use this standard to specify and approve field repair coatings for riser pipes on offshore platforms, fixed facilities and onshore production risers subject to splash‑zone exposure.
- Supports development of repair procedures for corrosion engineers, coating inspectors, QA/QC teams and coating contractors performing in‑situ repairs.
- Guides procurement and acceptance criteria for maintenance coatings, ensuring compatibility with existing shop coatings (ISO 18797-1) and operational requirements such as cathodic protection.
Who should use this standard
- Corrosion and asset integrity engineers
- Offshore maintenance supervisors and coating contractors
- Inspection and quality assurance teams (NDT/holiday detection, thickness measurement)
- Specification writers and procurement teams in the petroleum, petrochemical and natural gas sectors
Related standards
- ISO 18797-1 - New construction (shop‑applied) riser coatings and compatible maintenance systems.
- ISO/TC 67 publications and national adoptions (EN ISO 18797-2) for regional compliance.
Using EN ISO 18797-2:2021 helps ensure consistent, auditable selection and application of repair coatings that protect risers from external corrosion while meeting industry‑level testing, qualification and documentation requirements.
