In Situ Francis Turbine Blade Replacement due to Gross Cavitation
In Situ Francis Turbine Blade Replacement due to Gross Cavitation
In Situ Francis Turbine Blade Replacement due to Gross Cavitation
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Removal and <strong>Replacement</strong> of blades in situ<br />
• Upstream cavitation repair before replacement blades<br />
• During repairs it was decided that one of the three (3) blades<br />
identified for replacement was actually salvageable<br />
• Substantial time, discussion and engineering was expended<br />
prior <strong>to</strong> any site work in order <strong>to</strong> plan methods <strong>to</strong> remove,<br />
replace and inspect the blades<br />
• Peak Hydro determined the best solution was using butt weld<br />
preparations as opposed <strong>to</strong> the natural fillet conjunction of<br />
band, crown and the blades in the ‘as cast’ configuration<br />
• Post weld inspection (using ultra sound) of fillets would detect<br />
anomalies inherent <strong>to</strong> the casting<br />
• Butt joints are easier <strong>to</strong> prepare for weld processing and<br />
provide a ‘cleaner’ inspection zone<br />
<strong>In</strong> <strong>Situ</strong> <strong>Francis</strong> turbine <strong>Blade</strong> <strong>Replacement</strong> | NWHA Hood River| 2013-05-23<br />
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