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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Technical Aspects of Repair<br />
• <strong>Blade</strong>s measure 46” inches long by 16” wide<br />
• Thickness approximately 0.75” inches at leading and trailing<br />
edges; 1.25” at middle sections<br />
• Average repaired area 160 square inches some exceeding 250<br />
square inches<br />
• <strong>Cavitation</strong> generally exceeded 0.300” deep<br />
• Some areas greater than 1.00” deep<br />
• <strong>Blade</strong>s mapped prior <strong>to</strong> repair (as found condition)<br />
• Mapped repairs (as left condition) and pho<strong>to</strong>graphed<br />
• <strong>Blade</strong> vent openings measured before and after welding<br />
• Band gap clearance and run out was measured<br />
• Unit 13 downstream runner repaired while replacement blades<br />
for the upstream runner were being cast<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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