• Situation: During routine maintenance of a Chinese hydro-power station, heavy cavitation damage was recorded on the Kaplan turbine blades, particularly on the leading edges and the root of the blade near the hub connections. 

• Solution: Prepare the substrate and rebuild with Resimetal 101 Metal Repair Paste. Protect with Resichem 209 EIP PU. 

• Application Details: Blades abrasive grit blasted to SA2.5 with a 75-micron angular profile. Cavitation damaged sections rebuilt with 101 Paste using a plastic applicator. After a 4-hour cure, repaired sections machined to a flush finish. Following an overnight cure, blades fully coated with two applications of 209 EIP PU, applied by brush to a nominal total dry film thickness of 750 microns. 

• Situation: Leading edges of turbine blades showing signs of corrosion and wear damage. 

• Solution: Replace lost steelwork and protect with 203 Superflow Ceramic Fluid. 

• Application Details: Blades abrasive blast cleaned to SA2.5 with a 75-micron profile. Pitted sections rebuilt with 201 Ceramic Repair Paste. Blades coated by brush with 203 Superflow Ceramic Fluid, applied in two coats to a nominal total dry film thickness of 500 microns. 

• Situation: Internal turbine components, including Francis runners and runner hubs, suffering from pitting and requiring refurbishment. 

• Solution: Prepare the surface and fill pitted sections with Resimetal 203 Superflow. Protect with additional coating. 

• Application Details: Steel substrate abrasive blast cleaned to SA2.5 with a 75-micron profile. Pitted sections filled with 203 Superflow using a plastic applicator. Once cured, 203 Superflow applied by brush to the entire steel substrate in two coats to a nominal total dry film thickness of 500 microns. 

Using Resimac’s protective coatings and repair solutions offers numerous benefits for hydropower customers: 

Repairing rotating components in hydropower systems is essential for maintaining operational efficiency and extending the lifespan of critical equipment. Resimac’s advanced repair materials provide effective solutions for addressing cavitation and corrosion damage, ensuring that these components remain in excellent condition. 

For expert assistance in selecting the right Resimac grade for your specific application, contact Millstream Engineering today. Our team is ready to help you enhance the durability, cost-efficiency, and performance of your hydropower systems.