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Universal Dry Ice Blasting
Hydroelectric Generator Cleaning
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Actions taken before cleaning
• Maintenance crew recorded insulation resistance (Megger test)
• Stator temperatures were recorded at various generator loads
• Scaffolding was constructed
• Covers were removed from Generator
• Generator surrounding area were covered in plastic
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Cleaning of Generator
• Upper windings cleaned with CO2
• Lower windings cleaned with CO2
• Field Poles are cleaned with CO2
• Stator cleaned with CO2 (may require repositioning of rotor)
• Windings are hand wiped to remove any remaining dust and oil
• Generator inspected for oil leaks and damage
• Generator can be painted with 2 coats of Glyptal
• All plastic is removed and floors are cleaned
Note: Depending on the size and condition of the unit this process
will take 4-7 days to complete.
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Floors and generator were covered in plastic sheeting
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Lower windings covered with oil and dirt
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Upper end of rotor and windings before cleaning
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Oxygen monitor and warning sign in place. An additional monitor was worn by the nozzle operator.
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Dry Ice is (-109.3 F) CO2 Pellets are accelerated at high velocity. Upon impact the solid CO2 pellet turns to gas that expand in volume nearly 800 times of the pellet instantly. This process causes Micro-Explosions that help assist removal of debris.
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Stator before CO2 Blasting
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Stator and air vents partially cleaned. The air vents were plugged with gummy oil and debris. Leaving no air flow to cool the generator
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Properly cleaning the generator without removing the rotor saves companies so much money on time and man hours that it would take to disassemble and put the unit back together.
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Stator and air vents after CO2 Blasting
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Some areas did require a second blasting
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View of stator after second blasting
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Blasting Generator inspection windows with CO2
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Each winding is hand wiped after blasting to remove any residual dust and debris
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Upper windings after CO2 Blasting
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Lower windings after CO2 Blasting
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Upper end of generator after CO2 Blasting
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Vacuuming out lose dirt and debris
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Painted surfaces were cleaned and degreased by hand
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Thorough inspection of the generator conducted after all clean up is finished
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For additional information please contact:
Torie Fidler
Universal Dry Ice Blasting
760-525-8380
Email [email protected]
Website http://universaldryiceblasting.com/