Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1980-11-07
1983-01-11
Swisher, S. Clement
Measuring and testing
With fluid pressure
Dimension, shape, or size
73 4R, G01B 1322, G01B 1310
Patent
active
043676464
ABSTRACT:
A method and apparatus for detecting, measuring the extent of and locating localized areas of deterioration, such as pitting, in the interior walls of tubing or other hollow objects. A cylindrical pneumatic probe with its air input side connected to a constant flow source of pressurized air and having a transversely extending baffle ring with a sharp outer edge across which the flow of air from said source is directed through the sharp edged orifice created between the baffle ring sharp outer edge and the tube inner wall and a pressure transducer connected to the probe air input air generates signals transmitted to a visual recording device connected to the pressure transducer. In the method the pneumatic probe having its thin outer edged baffle ring of a diameter closely matching that of the tube interior to be inspected is connected to a constant pressure air source. The probe is inserted into a flawless tube base standard test tube having a diameter equal to the tube to be inspected and a constant flow of air is passed through the probe with the back pressure generated by the base standard test tube being measured and established as a zero based value. The probe is then inserted into a succession of flawless calibration tubes of increasing size increments and the back pressure is recorded for each successive calibration tube in relationship to the zero base value. The tube is then inserted into and passed along a length of a tube to be inspected and the measured back pressure is recorded for each increment of length of the tube with respect to the zero based value and back pressure generated by the succession of flawless tube of increased diameter.
REFERENCES:
patent: 3438244 (1969-04-01), Plumpe, Jr.
patent: 4125011 (1978-11-01), Porter
Allen, Sr. J. Hunter
Gillespie, Jr. Amos L.
Johnson George D.
Roskos Joseph W.
Swisher S. Clement
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