James Walker’s innovative shaft sealing system, HydroSele S, has proved its superb sealing efficiency by running maintenance free for over two years at ENEL’s massive Entracque pumped-storage hydroelectric scheme in Italy. The HydroSele cartridge unit replaced a mechanical seal that had to be changed frequently on the plant’s Unit 9 turbine causing unnecessary cost and inefficiency. The HydroSele has a leakage rate of only 15 litre/min, onetwentieth of the water leakage from the mechanical seal it replaced.
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April 1886: the Brunkebergs tunnel
First ever example of a ground source heat pump?