Method of inspecting a pipe liner bag

Details Method of inspecting a pipe liner bag Method of inspecting a pipe liner bag

1994-07-14

1996-03-26

Raevis, Robert

Measuring and testing

Inspecting

73 405R, G01M 312

Patent

active

055011152

ABSTRACT:
A method of inspecting a pipe liner bag is provided for efficiently and accurately performing in parallel inspections for a hardened condition and air-tight sealing effect of the pipe liner bag. A main pipe and a branch pipe are lined with hardened pipe liner bags, and then all open ends of the pipe liner bags are air-tightly sealed by air plugs to define an air-tight sealed space S within the pipe liner bags. Then, while the pressure within the sealed space is decreased, the inspections are made for a hardened condition and air-tight sealing effect of the pipe liner bag. If the pipe liner bag includes incompletely hardened portions, such portions will be deformed due to compression buckling, so that the deformed portions can be readily found by a TV camera equipped with a light emitting unit. In this manner, a hardened condition of the pipe liner bag can be accurately inspected. Also, if the pipe liner bag do not provide a sufficient air-tight sealing effect, the inner pressure within the sealed space will be increased, so that monitoring the inner pressure within the sealed space by a vacuum gauge permits an inspection to be readily and accurately made for an air-tight sealing effect of the pipe liner bags.

REFERENCES:
patent: 4002055 (1977-01-01), Kops
patent: 5072622 (1991-12-01), Roach et al.
patent: 5220822 (1993-06-01), Tuma

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