Magnetic flux leakage inspection of gas pipelines: The effects of remanent magnetization. Topical report, 1992-1994
The Magnetic Flux Leakage (MFL) Technique is the most commonly used technique to inspect large diameter transmission pipelines. A typical MFL inspection system uses permanent magnets to apply an axially oriented magnetic field to the ferromagnetic pipe material. Remanent magnetization affects the applied-magnetization because pipleline steels have sufficient retentivity to influence the magnetization of subsequent inspections. The remanent magnetization affects detection and characterization of pipeline corrosion in two ways. First, remanent magnetization changes the strength of the applied field level for subsequent inspection runs. Second, the remanent magnetization changes the flux leakage from corrosion defects, which affects defect detection and characterization of the defect geometry. Experimental data obtained from the GRI Pipeline Simulation Facility are used to illustrate the effect of remanent magnetization on flux leakage inspections.
- Research Organization:
- Battelle Memorial Inst., Columbus, OH (United States)
- OSTI ID:
- 80608
- Report Number(s):
- PB-95-226452/XAB; CNN: Contract GRI-5088-271-1696; TRN: 51992796
- Resource Relation:
- Other Information: DN: Color illustrations reproduced in black and white. See also PB--93-181899; PBD: Apr 1995
- Country of Publication:
- United States
- Language:
- English
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