Sand pump

in artesian well boring, a long, slender bucket with a valve at the bottom for raising sand from the well.

sand pump

[′san ‚pəmp] (mechanical engineering) A pump, usually a centrifugal type, capable of handling sand- and gravel-laden liquids without clogging or wearing unduly; used to extract mud and cuttings from a borehole. Also known as sludge pump.

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