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Corrosion Wheel Probe
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Where there’s a wheel......
There’s a way!
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Developed for pipe, pipeline and
vessel testing the evolutionary ergonomic design
of the Corrosion WheelProbe enables constant and
even pressure to be
applied in the testing environment, thanks to the
conformable WheelProbe
tyre, resulting in consistent and repeatable
amplitude response.
Excellent coupling is achievable, even on rough
corroded
surfaces, thanks to the conformable water filled
tyre.
Fine water misting is all that is required for
coupling, no
mechanical pumping of water is necessary. Encoded
50mm wide strip scan, B or C Scan, amplitude
of Time of Flight (depth) - dependant on the host
instrument or reporting software. The inspection
width of 50mm provides greater detection
capability.
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Circumferential & Longitudinal Scanning |
The Corrosion WheelProbe has been designed
specifically with Circumferential Scanning in mind.
The minimum diameter that can be accommodated is 4
inches/10 cms. Adjusting the inspection angle of the
Corrosion WheelProbe is very quick and can simply be
done in situ using the lever and guide on the side
of the WheelProbe, tightening the thumb wheel to
lock the instrument at the desired angle.
Scanning along the length of a pipe or cylinder is
also easily performed, again the minimum diameter
for this application is 4 inches/10 cms. An
enhancement to the construction of the Corrosion
WheelProbe is the front roller accessory which has
been developed specifically for Longitudinal
scanning. On pipe diameters of less than 24
inches/60 cm, this accessory improves stability by
supporting the WheelProbe tyre, allowing you to
obtain the best results from the WheelProbe over a
greater range of pipe diameters.
Performance of the Corrosion WheelProbe is
additionally enhanced due to the integral encoder
which enables repeatable and consistent C-Scanning,
Defect Evaluation and Sizing.
Suitable for use with
any Portable Phased
Array System.
Including the Olympus Omniscan range,
AGR Handyscan and products from the M2M range. |
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Application
Illustration: Oil Storage Tank Floors
Above ground storage tanks usually have a set of
inspection requirements:
• A complete bottom scan, including the annular ring
area, will be carried out via the MFL or SLOFEC
method.
• The floating roof will be measured on the top and
bottom side, sleeves and welding etc.
• The thickness of the tankwall will be measured.
Magnetic Flux leakage is a qualitative not
quantitative inspection tool but is a reliable
detector of corrosion on tank floors. Due to the
environmental and physical restrictions encountered
during real inspections no reliable quantification
of indications are possible. Amplitude alone is an
unreliable indication of remaining wall thickness as
it is more dependant on actual volume loss. Defects
exhibiting
various combinations of volume loss and through wall
dimension can give the same amplitude signal. Couple
to this the continually changing spatial
relationship of magnets, sensor and inspection
surface, it is absolutely clear that an
accurate assessment of remaining wall thickness is
virtually impossible. Truly quantitative results can
only be obtained using a combination of Ultrasonics
and Flux Leakage.
Providing reliable ultrasonic prove-up even with the
latest digital flaw detectors is beset with
problems: surface conditions, probe size etc.;
finding the minimum thickness of a single pit or the
minimum area of lake corrosion. Cone type
corrosion pitting is very common and is the most
difficult to detect ultrasonically.
The major reflecting surfaces are not favourably
orientated, the surfaces are rough and often ridged,
and the target area is often small in relation to
the beam cross section. The latter is true
particularly of the tip of the pit, which may not be
the most reflective facet of the ridged pit. This
type of corrosion has the lowest probability of
detection and the greatest inherent inaccuracy in
its measurement.
The Sonatest Rapidscan 2 linear scanning system with
the Corrosion Wheel Probe is a major advance on the
conventional techniques providing features
that help overcome problems and increase the
probability of detection and therefore correlation
with the MFL inspection. The design of the
WheelProbe allows use in the overhead and vertical
positions as well as floors, making it ideal
for all tank inspection requirements.
C-Scan mapping in both ToF (Depth) and Amplitude
makes detection of small conical pits more reliable,
as often the amplitude loss over the cone cannot be
detected. Using the corresponding amplitude B-Scan
allows differentiation
between the top and bottom surface wall loss, whilst
helping to differentiate between corrosion defects
and, most importantly, plate inclusions that can
easily be mistaken when using a single A-scan. The
C-Scan allows the minimum thickness to be found over
the area scanned, and the resulting pictorial image
is much easier to evaluate. |
Typical Underfloor Corrosion with Breakthrough
Hole 6 mm Plate
A-Scan/B-Scan
C-Scan Time of Flight
C-Scan Thermal Amplitude
C-Scan Time of Flight |
The industry sectors where the Corrosion Wheelprobe™ can be used include Petrochemical, Offshore, Oil and Gas, Aerospace, Composite Manufacturing and Marine.
• Developed for pipe/pipeline and vessel testing.
• Design enables consistent pressure, resulting in
consistent and repeatable amplitude response.
• Circumferential and Longitudinal Scanning
performed on 4” diameter pipework upwards.
• Excellent coupling by the conformable water filled
tyre.
• Fine water misting is all that is required for
coupling, no mechnical pumping of water.
• Encoded 50mm wide strip scan, B or C Scan,
amplitude or Time of Flight (depth) - dependant on
host instrument and reporting software.
• Suitable for use with any portable Phased Array
equipment.
• Corrosion WheelProbe is available with any
standard connectors.
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