The guide vanes and housings of hydropower turbines are exposed to permanent loads due to the ongoing impact of floating debris. Very deep erosion and cavitation occur in the clearance area towards the impeller. Overhauling by welding overlay to repair this damage is not always an adequate and optimum solution for these often-older cast structures, not to mention the enormous time involved.
We have a solution for problems with erosion on housings by means of repair compounds! Scope of application: Turbine casings Wicket gates / vanes Control devices Water brakes Suction pipes Drive shafts Stop valves MetaLine - Technical solutions in detail METALINE SERIES 700 MetaLine Series 700 coatings have much smoother surface structures in comparison with brush or trowel applied conventional epoxy / ceramic coatings. Hydro-dynamic flow conditions are positively influenced. The homogenous, elastic material structure is vibration-resistant and helps to compensate the continual variances in tension and pressure influences that occur due to cavitation. Damage caused by foreign matter and waste introduction is greatly reduced due to the material's erosion-resistant characteristics. METALINE SERIES XL MetaLine Series XL offers synthetic and ceramic specialized materials for non-metal refurbishment of damaged cast housings. They operate in a wet environment during processing and require no historical knowledge for their intended use. Repair applications are possible in one go or in several layers. After full cure they offer good protection against corrosive and erosive stresses.
MetaLine Series 700 – Sprayable / OEM Manufacturer quality MetaLine Series 700 coatings have much smoother surface structures in comparison with brush or trowel applied conventional repair methods. Hydro-dynamic flow conditions are positively influenced. Via its elastomeric features, this coating technology can eat up the destructive kinetic energy of impacting trash. Furthermore the continous vibrations in the system are dampened and will not lead anymore to disbonding or chipping of the protective skin. The continual variances in tension and pressure influences in the cavitation area are almost counterbalanced - simply as rubber would do it! MetaLine Series XL – Trowel- or brushable / Repair quality MetaLine XL series are special synthetic ceramic materials for the non-metallic replacement of lost cast metal structures. They are insensitive to high humidity during processing and do not require special handling skills. The application can also be made in higher layer thicknesses in a single operation. Major advantage is the fast installation even without dismantling the impeller from the spiral casing. After solidification, they provide protection against corrosive and erosive stresses for a certain period.
