6.48 mm diameter nozzle delivering 0.91 l/s to the runner which is rotating at 1084 rpm and generating 225 watts into the grid at an overall efficiency of 47%.

Monday, 27 August 2018

Blast through time

It's that time of year when once yearly maintenance jobs need to be done, and de-silting is one of them.  This year I devised a new way of blasting through the penstock without having to take the turbine off its plinth:




A galvanised union, barrel nipple, 90 degree elbow, and a short length of threaded pipe, each in 2" size, were all that were needed. The union screws on to where the jet sleeve has a thread for the nozzle retaining cap.

 With the head tank de-silted and the penstock as clean as a whistle, I'm ready now for the best possible level of generation in the coming 12 months.
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