Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1998-03-30
1999-10-05
Patidar, Jay
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324229, 324228, 324230, 324231, 324233, 324236, 324237, 324238, 324239, 324240, 324260, 324262, 73637, 738658, G01B 706
Patent
active
059630302
ABSTRACT:
An openable ring assembly is externally centered around and moved parallel to the centerline of a stationary pipe. As a low-frequency EM source signal is applied to the ring assembly, the time and/or frequency shifts of a detected EM signal from the source signal can be correlated to pipe wall thickness without removal of external pipe insulation and metal cladding, if present. The ring assembly may be opened or expandably segmented to allow pipe thickness detection around obstructions or larger diameter pipe. Centering is preferably accomplished by using rollers circumferentially attached to the ring assembly.
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Jacobson William O.
Patidar Jay
Union Oil Company of California
Wirzbicki Gregory F.
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