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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Repair Results and Conclusions<br />
• Vent openings measured between each blade set<br />
• Hydraulic Balance measured as percentage from nominal<br />
• ‘As Found’ measurements not considered reliable <strong>due</strong> <strong>to</strong> the<br />
poor condition of the blade surfaces<br />
• Averaged 0.85% for the downstream and -0.36% for the<br />
upstream<br />
• ‘As Left’ measurements reveal hydraulic balance has improved<br />
<strong>to</strong> 0.08% downstream and -0.05% upstream<br />
• The two blades replaced in situ were subjected <strong>to</strong> full NDT<br />
examination in addition <strong>to</strong> dimensional checks and found <strong>to</strong> be<br />
acceptable <strong>to</strong> ASME VIII standards<br />
• Runner integrity, hydraulic balance and fairness are all<br />
substantially improved<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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