Catalog Record

Data and Reports from S&T Project 20024: Laboratory Evaluation of Field Repairable Materials and Techniques for Cavitation Damage: Phase II

Cavitation resistant coatings have been used in mild cavitation conditions with mixed results and rarely are in service more than a few years before needing repair. Laboratory testing of two commercial polyurethane elastomers (rubber-like properties) provided superior cavitation resistance compared to prior coatings used in cavitating environments. These materials may provide protection in moderate or severe cavitating environments, comparable to stainless steel weld overlays. A field trial was deemed necessary to verify the outcomes of the laboratory findings. These two elastomers were selected for field trials on Nathaniel “Nat” Washington Power Plant Unit G21 turbine runner, a severe cavitation environment. Turbine runners have higher intensity cavitation and the commonly used stainless-steel weld overlays eventually cavitate with significant pitting, requiring repair on a three-year rotation . Initial results showed a small area of damage in the most severe cavitation location near the leading edge on the suction side of the blade.
Generation Effort S&T Project 20024: Laboratory Evaluation of Field Repairable Materials and Techniques for Cavitation Damage: Phase II
Location Western US
Themes Infrastructure and Assets, Hydropower
Tags Cavitation, Coatings, Cold Spray, Ceramic-filled Epoxy, Polyurethane Elastomer
Reclamation Project
Reclamation Program Science and Technology Program

Location Information

Location Name Western US
Location Description The 17 western states of Washington, Oregon, Idaho, Montana, North Dakota, South Dakota, Nebraska, Wyoming, California, Nevada, Utah, Colorado, Kansas, Oklahoma, Texas, New Mexico, and Arizona..
Location Tags Reclamation Domain
Location Parent
State(s) Arizona, California, Colorado, Idaho, Kansas, Montana, North Dakota, Nebraska, New Mexico, Nevada, Oklahoma, Oregon, South Dakota, Texas, Utah, Washington, Wyoming
Unified Region(s) Missouri Basin, Arkansas-Rio Grande-Texas-Gulf, Upper Colorado Basin, Lower Colorado Basin, Columbia-Pacific Northwest, California-Great Basin
Timezone MT
Elevation [ N/A ]
Vertical Datum NAVD88
Coordinates (lat, long) See Location Details
Horizontal Datum WGS84