Measuring and testing – Miscellaneous
Patent
1980-11-07
1982-08-03
Swisher, S. Clement
Measuring and testing
Miscellaneous
33178E, 33178F, G01B 528, G01B 2114
Patent
active
043422250
ABSTRACT:
A device for the internal inspection of pipelines under operation, such device sensing and registering the unevenness of the internal pipeline surface on the principal of mechanical-electrical sensing of the internal pipeline cross section. The device is composed of a supporting body to which at least one packing cuff and symmetrically placed displacement sensing elements are attached, the sensing elements having rotatable shafts to which pivoted sensing arms are connected. The arms are in engagement with a weakened cylindrical part of a packing cuff which is disposed about its entire perimeter in contact with the internal pipeline wall. Potentiometric, piezo-electric or other sensing elements are used for transformation of departures of the size of the passage through the pipeline to electrical signals. An evaluating device associated with the inspection device allows selective signal registration from (1) either pair of oppositely sensing elements or (2) the registration of only the displacement found by any pair of sensing elements which is a maximum as compared to the displacement reported by the other pairs of sensing elements. The invention can be applied in the internal inspection of pipelines for gaseous and liquid media by which the device is driven through the pipeline.
REFERENCES:
patent: 2398562 (1946-04-01), Russell
patent: 4098126 (1978-07-01), Howard
patent: 4227309 (1980-10-01), Jones
patent: 4301677 (1981-11-01), Fisher
Jandera Jan
Studnicka Jan
Ceske plunarenske pdniky, koncern
Swisher S. Clement
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