| The
Dynatron Automated Recording Inspection System (Daris)
uses an ultrasonic immersion pulse-echo technique and
has been specifically designed for inspecting boiler and
heat exchanger tubes. The sketch above shows the
Dynatron uniquely designed probe with its swivel-joints,
expandable centralizers and computer controlled rotary
micro-engine. |
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The specially designed micro-engine controls the
rotation of an ultrasonic transducer. This transducer sends
ultrasound at right angle into the wall of the tube and collects
the circumferential data. This is critical as any ultrasonic
signal less than normal (90o+2o)
on the entry, will severely reduce reflected signal energy.
Hence a loss of signal would lead to “no inspection” area(s). |
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The expandable centralizers enable the probe to
be positioned so that the transducer is perpendicular to the
tube’s entry surface. |
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The swivel-joints and the probe’s size enable it
to negotiate tight bends and swaged tubes as shown on thr right. |
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Daris probe
negotiating tight bends in boiler tubes |
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| Features |
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Motorised
probe – both axial and radial movements are computer
controlled. The speed and resolution of inspection can be
set by user via a computer/laptop and motor controllers. |
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Typical linear resolution for Near Drum is 50
scan per inch (spi)
and for Full Length 10 scan per
inch (spi). Radial resolution for both is at
200 readings circumferentially. So for a tube end of 2”,
there are a total of 10,000 readings (2X50X200) and the scan
time is 20 - 25 seconds. For a 5ft section will have
120,000 readings (60X10X200) and the scan time is 55 - 60
seconds. |
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Probe will go through most bends and swages
found in boilers. |
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Readings are repeatable to +/-0.001” (0.04
mm). Accuracy to +/- 0.005” (0.19 mm). |
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Live B-scan
and C-scan displays, as the tube is scanned giving the user
instant feedback about the condition of the tube being
inspected. |
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Data is saved on electronic media and can be
retrieved later for review or further analysis. |
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Personnel have over 20 years experience and
have encountered almost all types of tube thinning in boiler
and heat exchanger tubes. |
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Literature |
Daris Innovation PDF
(1.3MB) |
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Inspection of Boiler Tubes using Daris PDF (247KB) |
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Near Drum Boiler Tubes Inspection using Daris PDF (270KB) |
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Heat Exchanger Tube Inspection using Daris PDF (176KB) |
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Products
