Means for introducing inspection equipment in active pipelines

Details Means for introducing inspection equipment in active pipelines Means for introducing inspection equipment in active pipelines

1990-05-30

1991-06-25

Raevis, Robert

Measuring and testing

Inspecting

G01B 512

Patent

active

050256700

ABSTRACT:
A method and apparatus for internally inspecting a relatively small diameter live pipeline with a camera introduced into an elongated hole cut into the wall of the pipeline at a strategic location. A housing formed by a pair of opposed oblique nipples is secured to the pipe and a rotary cutter is operated successively through the nipples to produce the elongated hole. The camera is introduced successively through each of the nipples to scan both upstream and downstream of the location of the elongated hole. The oblique orientation of the nipples simplifies the elongated hole forming operation and reduces flexural stresses on a cable used to propel the camera through the pipeline.

REFERENCES:
patent: 997464 (1911-07-01), Metcalf
patent: 3703909 (1972-11-01), Erb
patent: 4067353 (1978-01-01), DeHoff
patent: 4460920 (1984-07-01), Weber et al.
patent: 4546789 (1985-10-01), Taylor
patent: 4649948 (1987-03-01), Hudson

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