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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Elements and Considerations of the Business Case<br />
• Unit 13 is a double runner horizontal shaft <strong>Francis</strong> <strong>Turbine</strong>. The<br />
turbine casing consists of two cast iron halves<br />
• Station sees significant seasonal temperature changes which<br />
causes rise and fall of the structure and unit alignment issues<br />
• Mani<strong>to</strong>ba Hydro elected not <strong>to</strong> separate the casing on Unit 13<br />
• <strong>In</strong>itially attempted cavitation and other repairs in situ using in<br />
house employees and internal procedures<br />
• Results and progress resulted in reassessment<br />
• Decided <strong>to</strong> contract repairs <strong>to</strong> OEM’s in combination with,<br />
specialty hydro repair service providers, MH’s in house labor,<br />
engineering and project management teams<br />
• Both Unit 13 turbine runners exhibited extensive and gross<br />
cavitation<br />
• Upstream cavitation is worse (all units)<br />
• Runner bands were intact except for cavitation damage<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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