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Pulp & Paper Industry
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Benefits of AET
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What
is Acoustic Emission Testing and what is it used for?
Acoustic
Emission Testing
(AET) is a Non Destructive Testing method that is used to find structural defects and
imperfections in structures and components in a vast array of applications. It is used to
detect the presence and location of these structurally significant defects by making use
of piezoelectric transducers that typically operates at frequency ranges between 20 to 600
kHz. These transducers are mounted on the structure by making use of a couplant media such
as silicone vacuum grease and kept in place by duct tape, magnets, clamps etc. The
transducers or sensors as they are more commonly called are calibrated in accordance with
ASTM recommendations. The location and spacing of sensors depend very much on the
attenuation characteristics of the structure under test.
A
controlled stress is applied and the sensors are then able to detect the presence and
evaluate the intensity of shock waves emitted by a discontinuity under stress. Data is
stored in tabular form on computer hard drive and then converted to graphics for ease of
interpretation. AET as a test method is a passive listening device and does not need to
input a signal to be able to get the results.
If set up correctly with the attenuation
characteristics of the material and the spacing between sensors taken into account for the
material under test it becomes a global detection device with accurate location of defects
and imperfections.
The
following are but a few of the applications that Advanced Testing Technologies has used
Acoustic Emission Monitoring for:
Petrochemical
& Chemical Industry:
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Metal Pressure Vessels and
PipingStorage Vessels
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Polly Ethylene Vessels
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FRP Vessels and Piping
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Reactors and Hot Circuit Piping
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Spheroids
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Heat Exchangers
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De Aerators
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Underground piping
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Cooling Fan Blades
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Valve Leak Testing etc.
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Pulp
& Paper Industry:
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Chlorinator Towers
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Batch Digesters
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Oxygen Reactors
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FRP Vessels and Piping
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Recovery Boiler Floors
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Reel Spools
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Suction Rolls
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Drying Cans
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Yankee dryers
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Cast Iron Chill King rolls
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Queen rolls
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Noss Cleaners
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Processing kettles, etc.
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Utilities
Industry:
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Boiler Tube Wall Inspection
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Steam Drums
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Boiler Feed Water and Steam
Pipe
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Heat Exchangers
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De Aerators
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Cooling Fan Blades
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Condenser Tube Leaks
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Valve Leak Testing etc.
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