초록 ▼

A method and apparatus for detecting leaks in pressurized mains comprising input coupling structures spaced along a main, each coupling permitting insertion of a detector head connected to a hose/cable of extended length, a reel and housing holding the hose/cable which is designed to input fluid int

A method and apparatus for detecting leaks in pressurized mains comprising input coupling structures spaced along a main, each coupling permitting insertion of a detector head connected to a hose/cable of extended length, a reel and housing holding the hose/cable which is designed to input fluid into the hose and make electrical connections to microphone and transducer structure in the head. Leaks in the main are located by depressurizing the main, inserting the detector head through a coupling, feeding pressurized fluid through the hose into rearwardly projecting jets in the head for effecting travel thereof lengthwise of the main, stopping the fluid flow, again pressurizing the main to effect any leaks, energizing the microphone while slowly retracting the head by winding up the hose/cable on the reel at the input position, listening for leak noise as the head is retracted toward the insertion point, and upon leak noise being heard, stopping the retraction and then energizing the transducer within the head. Signals from the transducer can be detected by an above-ground receiver for pinpointing each leak. After suitably marking each point of leakage, the retraction, listening, stopping, signalling, etc. steps are repeated for each additional leak.

대표청구항 ▼

A leak detector device for use in detecting leaks in pressurized water mains comprising: detector means which can travel an extended distance inside said water mains when same have been depressurized; insertion coupling means attachable to said mains at spaced points therealong to permit entry of sa

A leak detector device for use in detecting leaks in pressurized water mains comprising: detector means which can travel an extended distance inside said water mains when same have been depressurized; insertion coupling means attachable to said mains at spaced points therealong to permit entry of said detector means into the mains after depressurization thereof; further means for effecting movement of the detecting means lengthwise of the depressurized mains in one or the other of each direction thereof; and additional means for effecting both reverse movement of the detector means and for making electrical connections therewith.