Application of wear-resistant anti-abrasive coating on the details of the “Ring of the labyrinth seal of the turbine” of the Baksan hydroelectric station

Application of wear-resistant anti-abrasive coating on the details of the “Ring of the labyrinth seal of the turbine” of the Baksan hydroelectric station
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Protection of the rings of the labyrinth compaction of the water turbine against abrasive and cavitation effects.

What problem was solved: Protection of the rings of the labyrinth compaction of the hydraulic turbine against abrasive and cavitation effects.
What is the name of the equipment: hydraulic turbine Type RO-110-B-130 (power 9 MW, capacity 35 m3 / sec.).
Working conditions details: High-pressure water flow, abrasive, cavitation wear.
Characteristics of parts without coating: Base - steel 06H12NZD.
Customer’s problem: Baksanskaya HPP is one of the oldest in Russia, built in 1930. The main problem is the presence of a large amount of solid impurities in the water entering the turbine: quartz sand, particles of tungsten and molybdenum ore. As a result, turbine parts are subject to strong abrasive wear.
Plakart Solution: HVOF deposition with Plakart material - 0.08-H. In the process of preparatory processing of parts, defects were identified (shells, grooves along the weld due to poor-quality welding). The problem was solved by manual machining of parts, followed by welding defects and grinding under spraying.

This solution provides an increase in the service life of the labyrinth seal rings by several times as compared with uncoated parts. Plakart coating application - 0.08-Н is laid in the project documentation, which makes it possible to present this solution to design and production organizations of the industry for similar projects.


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