Pipe inspection method and device

Details Pipe inspection method and device Pipe inspection method and device

G - Physics

01

M

33/141

G01M 3/28 (2006.01) G01B 5/12 (2006.01) G01B 5/207 (2006.01)

Patent

CA 1319507

Abstract of the Disclosure A method and device for inspecting the internal cross-sectional shape of pipes, and particularly of sewer pipes. A mandrel is inserted into the pipe. The mandrel may include an elastomeric member providing a fluid seal engaging the internal pipe surface. The mandrel also has a retrieval cord attached thereto and trailing therebehind. A plug member is provided behind the mandrel, which may be inflatably expanded to define a second fluid seal with the pipe. The space between the pipe and the two fluid seals is pressurized, such as with compressed air, causing the mandrel to advance along the pipe, pulling the retrieval cord as it advances. The mandrel's advancement will be stopped by a sufficiently large deformation. Thereafter, the mandrel is retrieved by pulling on the retrieval cord. In one embodiment of the device, a mandrel and elastomeric member combination is provided that is capable of modification to accommodate various diameter pipes. In addition, an elastomeric member is disclosed which is a single piece diaphragm for engagement with the mandrel.

608590

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