CDI TRAXALL 770 User Manual page 7

DEVICES
OVERVIEW TRAXALL 700 SERIES USER GUIDE
Magne c Flux Leakage (MFL) Pigs
Magne c Flux Leakage is a form of nondestruc ve inline inspec on that
detects corrosion, pi ng, missing metal, cracks, and/or other defects in
steel pipelines.
An MFL "smart pig" such as shown here is a common inline inspec on
tool:
DETECTOR
MAGNETIC POLES MAGNETIC POLES
ODOMETER WHEELS DATA RECORDER
As it travels through a pipeline, the magne c array magne zes the steel.
When defects are encountered, the magne c fi eld "leaks" from the
steel. This leakage fi eld is sensed by the magne c detector.
Field intensity and defect loca ons are usually stored by the unit's on- y
board recorder.
Inline Inspec on (ILI) Tool Transmi ers
ILI transmi ers are similar in performance
and func on to the T-series transmi ers,
but in lieu of pressure housings, are
designed to work in conjunc on
with MFL pigs.
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