Overview
ISO/TS 19392-3:2018 provides standardized test methods to determine the resistance of coating systems or tapes on wind‑turbine rotor blades to rain erosion using a water jet. The Technical Specification describes laboratory procedures that simulate rain impingement by applying controlled water jets to coated glass‑fibre composite test panels and evaluating coating damage until the composite substrate is exposed.
Key topics and requirements
- Scope: Laboratory water‑jet methods for rain erosion assessment of blade coatings and tapes; intended to support pass/fail decisions and comparative evaluations.
- Test principles: Three test modes are specified:
- Interrupted/pulsating water jet on a fixed panel (PJET)
- Continuous water jet on a moving panel with a vertical rotation axis
- Continuous water jet on a moving panel with a horizontal rotation axis
- Apparatus & calibration:
- High‑pressure pump, nozzle(s), panel holder and rotation drive as appropriate for each mode.
- Mandatory calibration of equipment (reference to ASTM G73‑10) using traceable calibration materials (e.g., Al, stainless steel, PU, PMMA).
- Specimens & preparation:
- Flat test panels made from typical glass‑fibre composite substrate; sample geometry examples are provided.
- Panels must be prepared to reflect actual leading‑edge configuration (fillers, protection layers) and conditioned per ISO 291 (23 ±2 °C / 50 ±10 % RH) for at least 7 days.
- Coating thickness shall be specified and agreed between parties.
- Procedure & evaluation:
- Test at least three specimens per condition.
- Pre‑ and post‑exposure examination (visual/microscopic) and thickness measurements; endpoint is when defects expose the composite substrate.
- Test media: deionized water, tap water, chloride‑containing water or artificial sea water (conductivity and temperature to be reported).
- Example test parameters (as given in the specification): nozzle diameters ~0.8–1.0 mm, pressures ~100–160 MPa, jet velocities ~140–165 m/s, flow rates and distances defined per method.
Applications and users
ISO/TS 19392-3 is aimed at organizations involved in wind‑turbine blade durability and protection:
- Coating and tape manufacturers validating product resistance to rain erosion
- Wind‑turbine OEMs and blade designers comparing leading‑edge protection systems
- Independent testing laboratories performing standardized erosion testing
- Certification bodies and procurement teams requiring reproducible, comparable test data
- R&D and field maintenance groups assessing material performance and failure mechanisms
Practical uses include benchmarking coating systems, qualifying leading‑edge tapes, supporting material selection for harsh climates, and correlating lab results with field performance.
Related standards
Relevant normative references and companion documents include ISO 291, ISO 1513, ISO 2808, ISO 4618, ISO 4628 series (assessment of degradation), ISO 13076, ISO 15528, ISO 19403‑2 and ASTM G73‑10. These support conditioning, sample preparation, measurement and calibration practices for consistent rain‑erosion testing.
Keywords: ISO/TS 19392-3:2018, rain erosion, water jet test, wind‑turbine rotor blades, coating systems, PJET, liquid impingement erosion, leading‑edge protection, coating resistance.