.~ With suction pump inlet communicating with bore bottom
DEFINITION
Classification: 175/213
(under subclass 207) Apparatus including a pumping means, the low pressure side or intake of which is in direct communication with the bottom of the borehole.
(1) Note. This material generally relates to which is commonly called "reverse circulation", that is, the direction of flow is opposite to normal drilling circulation in which the pressure side of a pump forces fluid from the bottom of a borehole.
(2) Note. The pumping means may be located below ground.
SEE OR SEARCH THIS CLASS, SUBCLASS:
324, and the search there noted for other means to induce fluent flow including a pump.
