Engineering Assessment of Deformed Spillway Gate
This paper was presented at the 2016 HydroVision International Conference.
Commissioned in 1947, Karapiro Hydro power station has
a generating capacity of 96MW and is one of 9 power stations located on the
Waikato River in the North Island of New Zealand. The Karapiro power station is
owned and operated by Mighty River Power.
After removing the No. 2 spillway gate at Karapiro
power station, it was found that the lower section of the gate had undergone
permanent deformation. Corrosion on the internal and external surface of the
gate was also reported. A fitness-for-service (FFS) assessment was undertaken
to determine the acceptability of the spillway gate under current conditions. This paper covers the
methods used to determine if the spillway gate was fit-for-continued service.
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