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31
OCT
2016

Kingsley Hydro Inspection: Images from the Inside

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The accompanying images reveal parts of the Kingsley Hydroplant that are seldom seen by anyone other than Central employees who perform regular inspections, maintenance and repairs at Nebraska’s largest hydropower plant.

Central’s engineers and maintenance crews take the plant off-line annually for regular inspection and maintenance of the facility’s mechanical and electrical components, but every five years the 19-feet-diameter penstock leading from the Control Tower in Lake McConaughy and the scroll case which routes the water through the turbine are de-watered for complete inspections.

Once the gates on the Outlet Tower and the huge guard valve within the hydroplant are closed, preventing water from Lake McConaughy from entering the plant, pumps removed water from the penstock so a two-man crew can paddle a small rubber boat up the penstock to the base of the Outlet Tower to perform the inspection. (In addition, Central personnel take a larger aluminum boat – with a motor — up the 28-feet-diameter penstock from the “Morning Glory” spillway to inspect the inside of that pipe.)

Being inside the huge scroll case, which is a spiral-shaped intake tube that routes water entering from the penstock through the wicket gates just above the turbine blades, is not a place for someone with claustrophobia. First, it’s pitch dark until portable lights are turned on to enable the inspection process. Second, one arrives (either immediately or eventually) at the realization that you are well below the bottom of Lake McConaughy and only several inches of steel separate you from almost 2 million acre-feet of water on the other side.

But for the men doing the inspections, it’s all in a day’s work.

 

The wicket gates that control the flow of water falling over the turbine blades. The gates move along a vertical axis.

The wicket gates that control the flow of water falling over the turbine blades. The gates move along a vertical axis.

View from below the turbine hub, with blades and closed wicket gates visible.

View from below the turbine hub, with blades and closed wicket gates visible.

Close-up view of one of the stainless steel turbine blades.

Close-up view of one of the stainless steel turbine blades.

The turbine hub with scaffolding erected to facilitate inspection and maintenance work.

The turbine hub with scaffolding erected to facilitate inspection and maintenance work.

The guard valve between the penstock and scroll case.  The valve is 19 feet in diameter.

The guard valve between the penstock and scroll case. Although it doesn’t appear very large in the photo, the valve is 19 feet in diameter.

 

 

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