Railways – Tubular way – Internal service device
Patent
1993-06-17
1994-11-01
Le, Mark T.
Railways
Tubular way
Internal service device
B61B 1300
Patent
active
053599390
ABSTRACT:
A device for the in-line inspection of pipe. The device is spring-loaded to provide an adequate pressure between the supporting brushes of the device and the interior pipe wall for effective magnetic inspection with pipe of various internal diameters. A biasing spring is used in association with the spring-loaded device to extend and provide a supplemental force when the device passes from a relatively small to a relatively large diameter pipe to rapidly and effectively position a magnetizing section of the device within the larger diameter pipe.
REFERENCES:
patent: 3495546 (1970-02-01), Brown et al.
Le Mark T.
Tuboscope Vetco International Inc.
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