F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 55/18 (2006.01) F16L 55/30 (2006.01)
Patent
CA 2546006
A method for repairing metal pipe with dents includes steps of a) holding the pipe with first and second ends in position; b) dragging the mandrel through the pipe; and c) pushing out the dents from inside to an original level of the surface of the pipe. The cross-section of the mandrel has a substantially same cross-section of the hollow space of a undamaged pipe, and the outer surface of the major portion of the mandrel fits tightly to the inside of the undamaged pipe. The step of holding the pipe includes steps of a) guiding the pipe into a locking position along the direction of the axis of the pipe; b) stopping the pipe along the direction of the axis of the pipe against pressure imparted by momentum transfer from the friction between the pipe and the mandrel; and c) stopping the pipe along the perpendicular direction of the axis of the pipe against pressure imparted by momentum transfer from the friction between the pipe and the mandrel.
Kim Honggie
Mcfarland Russell
Marks & Clerk
State Pipe & Supply Inc.
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