Grand_Island_Precipitator_Original

Expansion joint area extending the precipitator roof

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expansion joint area, extending the precipitator roof over the inlet ducts and replacing the corroded duct. During the Spring outage in 2001, they investigated the area again to see if the condition had worsened. Two insulating contractors visited the plant this summer, and both believe that the water is entering because the original design of the lagging and flashing was inadequate and because of damage over the years by workman walking on the lagging. During the Fall outage in October a precipitator repair contractor and an insulating contractor were hired to look at the problem. Insulation and lagging were removed over one of the economizer expansion joints and the top of the west precipitator inlet duct. Cracks were discovered in both places, and the extent of the leakage became evident. The original design of lagging and flashing does not have enough overlap or slope to keep water from blowing under the edges, and there are valleys that retain water. There are lots of water leaks near the economizer expansion joints, and the joints appear to be near the end of their life and will have to be replaced. They are metal joints about 8 feet by 30 feet and cannot be
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  • Spring '12
  • A.Young
  • Work, Thermal Expansion, Expansion joint, Expansion Joints, Precipitator Duct

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