G - Physics – 01 – M
Patent
G - Physics
01
M
116/66.6
G01M 3/04 (2006.01) G01M 3/26 (2006.01) G01M 3/28 (2006.01) G01N 19/08 (2006.01)
Patent
CA 1102633
Cases 5791, 5916, 5917, 5918 EARLY CRACK DETECTION Abstract Early detection of cracks in non-permeable, structural members subject to stress is effected before the cracks traverse the member by: (a) forming a cavity in the structural member or adjacent thereto such that a crack forming in the structural member provides a passage for a fluid to flow between the environment and the cavity without passing through the entire structural member, (b) sealing a fluid passageway in fluid communication from the cavity to a source of pressure different than ambient pressure at the structural member and to a pressure sensor, (c) imparting a higher or lower pressure to the cavity and the fluid passageway, and, (d) monitoring the internal pressure in the cavity and fluid passageway with the pressure sensor, such that a crack in the structural member penetrating to the cavity allows passage of fluid between the environ- ment and the cavity and is thus detected by the pressure sensor. The apparatus and process is particularly appli- cable to early detection with vacuum of cracks in the heat affected zone adjacent to welds on critical stressed members of an offshore platform. A strain guage system may be employed in conjunction with the crack detection system.
293331
Oertle Donald H.
Peterson Marvin L.
Continental Oil Company
Ridout & Maybee Llp
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