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MK
IV ACPD Instrument
Applications
Alternating
Current Potential Difference (ACPD) is a crack sizing technique
which can be used for monitoring and measuring fatigue crack length
and depth. It has been used for monitoring crack extension in laboratory
tests and also for surface crack shape evolution studies.
The MK IV
ACPD instrument can be used for a variety of crack sizing applications,
including:
- Welded connections, butt welds, tee butts, tubulars, pressure
vessels (refinery, nuclear, offshore topside and underwater)
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Threaded
connections, nuts, bolts, drillstring threads, large diameter
threads
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Automated
inspection using tracking systems, robots
-
Monitoring
of cracks to give crack growth data
-
Monitoring
of critical regions for crack detection
-
Turbine
blades, blade roots
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Castings,
forgings, ground repairs.
Studies at University College London, on electrical field perturbation,
have produced theoretical interpretations of the ACPD measurements
eliminating the need for calibration. TSC can advise on application
of correction factors based on these results.
ACPD
Measurement / MK IV ACPD Instrument
/ Applications 1 2
3 4
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