hydraulic circulating system

hydraulic circulating system

[hī′drȯ·lik ′sər·kyə‚lād·iŋ ‚sis·təm]
(mining engineering)
A method used to drill a borehole wherein water or a mud-laden liquid is circulated through the drill string.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.