Method of detecting creep swelling
US5035143A · kind A · utility
52Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Apr 10, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0422
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is disclosed for ultrasonically detecting creep swelling in tubular members such as fossil utility steam lines and headers. Ultrasonic surface waves (34) are propagated around the pipe (10) in a circumferential direction. The transit time (.DELTA.T) is measured by using the pulse overlap technique with an oscilloscope (24). Circumferential dimension is obtained by multiplying the transit time (.DELTA.T) by the known Raleigh velocity of sound in the tubular member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.