Coleridge G8 & G9
DESIGN AND MANUFACTURING
Hydroworks was commissioned by TrustPower Ltd to redesign the two 1922 Escher Wyss cast steel Francis turbines at Coleridge power station to improve their efficiency and service life.
The new martensitic stainless steel runners were designed using computational fluid dynamics and the runner stresses were determined using finite element analysis.
Comparison of the tailrace of G8 post refurbishment and G9 pre refurbishment, both operating at the same power output of 3,000 kW,
G8 also shows a weir height of 4.0 and steady versus a G9 weir height of 4.4 and fluctuating between 4.0 and 5.0. This difference in weir heights equates to a reduction in flow of 12% at the same power output.
|Location:||Coleridge, New Zealand|
Replacement runner, seals, wicket gate wear plates and refurbishment of head covers and turbine shaft.
|Nominal Output:||3,000 kW|