Journal
WEAR
Volume 372, Issue -, Pages 208-215Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2016.11.003
Keywords
Test rig; Slurry erosion; Pelton turbine; Needle valve; Nozzles; Wear; Erosion; Sediment; Plasma nitriding; HVOF coatings
Funding
- AES CHIVOR management
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Over 75% of domestic electric power consumption in Colombia is supplied by hydropower. Abrasive wear is degrading turbine components such as Pelton needle valve nozzles. This problem has been studied on the components themselves (in situ). However, it was necessary reproduce the same hydro-abrasive phenomena in a controlled laboratory environment. This study describes the design and construction of a test rig capable of replicating the same wear mechanism present in Pelton needle valve nozzles at Chivor hydroelectric plant. The development of the test rig allowed to conduct empirical testing for the comparison of the plasma nitriding process versus the WC-Co-Cr coat deposited by HVOF to extend the lifetime of the nozzle. Both processes showed significant improvement in hardness and wear resistance compared to the original material specification of the needle valves. (C) 2016 Elsevier B.V. All rights reserved.
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