A surge tank
is a standpipe or storage reservoir
at the downstream end of a closed aqueduct
or feeder pipe - as for a water wheel
- to absorb sudden rises of pressure and to furnish water quickly during a drop in pressure. Also known as surge drum. An open tank to which the top of a surge pipe is connected so as to avoid loss of water during a pressure surge.
(mining engineering) In pumping of ore pulps, a relatively small tank which maintains a steady loading of the pump.