Pipeline inspection-tool speed alters MFL signals--
- Queen's Univ., Kingston, ON (Canada)
Detailed measurements show that pipeline in-line inspection-tool speed can cause significant reduction in defect-induced magnetic flux leakage (MFL) signals. This reduction must be taken into account in any attempt to measure defect penetration to 10% accuracy as opposed to simply detecting anomalies. The authors have undertaken experimental measurements of defect-induced magnetic leakage flux distributions generated with an MFL anomaly detector representative of the advanced inspection tools used for pipeline monitoring. Given are some initial results from detailed maps of defect-induced MFL patterns made at different relative tool velocities for various defect penetrations. These show obvious and significant variations with velocity. These results will help balance earlier contrary statements.
- OSTI ID:
- 7016707
- Journal Information:
- Oil and Gas Journal; (USA), Journal Name: Oil and Gas Journal; (USA) Vol. 88:5; ISSN OIGJA; ISSN 0030-1388
- Country of Publication:
- United States
- Language:
- English
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CHEMICAL REACTIONS
CORROSION
CURRENTS
DESIGN
ELECTRIC COILS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
EQUIPMENT
IN-SERVICE INSPECTION
INSPECTION
LEAKAGE CURRENT
MAGNET COILS
MAGNETIC FLUX
MEASURING INSTRUMENTS
MONITORING
NATURAL GAS WELLS
OIL WELLS
ON-LINE MEASUREMENT SYSTEMS
ON-LINE SYSTEMS
PIPELINES
PITTING CORROSION
WELLS