Detecting failures in flexible multistrand steel structures

Details Detecting failures in flexible multistrand steel structures Detecting failures in flexible multistrand steel structures

2011-01-25

2011-01-25

Patidar, Jay M (Department: 2858)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

C324S232000, C324S220000

Reexamination Certificate

active

07876096

ABSTRACT:
A flexible elongate structure, such as a flexible riser (10) for connecting oil and gas wells to floating production platforms, comprising at least one layer (20) of steel wires near the surface which extend at least partly along the length of the structure, can be monitored by inducing a magnetic field in the steel wires using an electromagnetic coil, and monitoring the magnetic flux density near the surface of the structure so as to detect if any wires have broken. Measurements are made at two different frequencies, the lower frequency giving an output dependent both on stresses and on the number of adjacent wires in the layer (20), and the higher frequency giving an output primarily dependent on the number of these wires. By comparing these two measurements a corrected output parameter (P) may be obtained that is indicative only of stress. A break in a wire can be expected to change the stress in that and adjacent wires.

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WPI/Derwent English language abstract of FR2239173.
Patent Abstracts of Japan English language abstract of JP 61164151.
WPI/Derwent English language abstract of JP2000055888.

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