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Aboveground Marker (AGM):
A portable device placed on the ground above a pipeline that both detects and
records the passage of an in-line inspection tool or transmits a signal that
is detected and recorded by the tool.
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AC impedance: see Electrochemical
impedance spectroscopy (EIS).
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Acoustic emission (AE):
Corrosion monitoring with AE is based on measuring acoustic sound waves that
are emitted during the growth of microscopic defects, such as stress corrosion
cracks.
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Anomaly: Any kind of imperfection,
defect, or critical defect that may be present in a system or material. An indication
may be generated by nondestructive examination, such as in-line inspection for
pipeline.
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Applied Magnetic Field:
The strength of the magnetization field that is produced in a pipe wall by a
magnetizing system in an in-line inspection tool.
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