| 摘要 |
<p>A washing system for oil tanks comprises a washer head (16) for mounting within an oil tank, and a conduit (22) for delivering fluid under pressure to nozzles (26) on the washer head which are movable so as to distribute the fluid emerging under pressure from the nozzles over the internal walls of the tank. A cam and follower device (27, 32) is arranged to sense the continuing operative movement of the nozzles, and to transmit to the exterior of the tank, through a fluid filled conduit (33), pressure pulse signals indicative of said continuing movement, means (38) being provided to monitor the signals and produce an output in response thereto.</p> |
