Trenchless pipe replacement apparatus and technique
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jul 8, 2003
Issued Date -
N/A
app pub date -
Aug 31, 1999
filing date -
Jul 27, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The apparatus and technique of the invention constitutes a hydraulic jack system for pushing sections of new pipe which, in turn, pushes a sleeve-cone expander arrangement to break up the old pipe and define a straight path for the new pipe. Apparatus is employed to determine the skin friction and the penetration friction, and to dispense a lubricant to reduce such frictional forces.
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