Early crack detection with multi-pressure system

Details Early crack detection with multi-pressure system Early crack detection with multi-pressure system

1977-04-04

1978-08-08

Ruehl, Charles A.

Measuring and testing

Surface and cutting edge testing

73 40, 116 70, G01M 302

Patent

active

041049063

ABSTRACT:
Early detection of cracks in nonpermeable, structural members subject to stress is effected before the cracks traverse the member by forming a plurality of cavities in the member or adjacent thereto in which a plurality of fluids at differing pressures are confined and monitored, such that a crack in the structural member penetrating between at least two cavities allows passage of fluid between the cavities and is thus detected by a pressure sensor. The apparatus and process is particularly applicable 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 gauge system may be employed in conjunction with the crack detection system.

REFERENCES:
patent: 3667862 (1972-06-01), Parr
patent: 3691820 (1972-09-01), Fiore
patent: 3972223 (1976-08-01), Torghele
patent: 3985318 (1976-10-01), Dominey et al.

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