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 />
• Metallurgical samples from runner crowns, bands and blades<br />
revealed chemistry similar <strong>to</strong> ASTM A27 Grade 70-36<br />
• Highly variable carbon content – classified as Medium Carbon<br />
Steel - Carbon Equivalent (CE) determines weldability<br />
• Repairs costs for in situ cavitation and blade replacements<br />
estimated <strong>to</strong> be substantially less than replacement runners<br />
• Return the unit <strong>to</strong> service one year earlier<br />
• Determined that the most cost effective and least risk repair<br />
was removal of three (3) blades by casting replacements<br />
• <strong>Blade</strong>s were 3D Laser Scanned<br />
• Data translated in<strong>to</strong> a CAD model and drawings from which<br />
blades were 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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