A surge tank in a hydropower penstock system is used to:
Choose the correct answer
Increase the pressure in the penstock
Provide temporary water storage to absorb/supply water during load changes, reducing water hammer
Reduce the flow velocity permanently
Filter sediment before the turbine
Correct Answer
B. Provide temporary water storage to absorb/supply water during load changes, reducing water hammer
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When load on turbine suddenly changes (gate closure/opening), surge tank provides/absorbs water, reducing the water hammer pressure wave in the penstock. The tank oscillates until a new steady state is reached.
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