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www.dacon-inspection.com [email protected], [email protected]
1979 Dacon was originally incorporated in Norway in 1979as a diving and sub sea company specializing for the Oil &
Gas industries.
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www.dacon-inspection.com [email protected], [email protected]
1994 Dacon started business in Thailand and continued
working on upgrades or specific developments to suit clientsrequirements.
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www.dacon-inspection.com [email protected], [email protected]
1999 Dacon started development of a brandnew pipeline intelligent pigging system. This was
to be developed as a tool capable of providing
the highest possible corrosion measurement
accuracy for pipelines.
These tools started commercialservice in 2003 and have since been
utilized world wide.
NEW!4 inch Magneticcoupling System
8 inch direct drive with oil System
Travel direction ofultrasonic intelligent pig
14 inch ultrasonic intelligent pig
6 inch ultrasonic intelligent pigtraveling inside acrylic pipe
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2005 Dacon started its own Research and DevelopmentDepartment and Today Dacon R&D department has 8 full
time scientists under a Professor of Physics.
With todays availability of advanced technology such as GPS
systems, inclinometers, accelerometers, sensors etc., there is
virtually no limit to the amount of data that can be gathered
from an ILI tool run down a pipeline.
A large pipeline test yard has been built to facilitate much of
the pipeline developments.
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2012 Dacon opened new offices in Singapore and Jakarta, Indonesia(DISS and DISI)
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Internal Rotary UT Pigging and Technology
Strengths of UT solution
Offshore Case Study
Onshore Case Study
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Human ear frequency range (15-20,000 Hz)
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Sound
Electrical
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Very high frequency (50,000-150,000,000 Hz)
Mechanical
vibration
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Velocity =
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The UT pigging technique provides unparalleled inspection
accuracy in steel and dense material pipelines. The smallest
corrosion, pitting or erosion is immediately detected and
measured in relation to the pipeline integrity.
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The system consists of a horizontally placed ultrasonic transducer sending its soundwaves horizontally.
A 45 rotating mirror then directs the sound waves perpendicular towards the pipe
wall.
Every time the signal hits a surface a proportion of it will reflect back to the transducer
the same way it came.
The difference in time between the sent and received signal allows the computer tocalculate the time of travel which is then converted to distance and the measurement
recorded.
These measurements can be made by the transducer up to 1,600 times per second
depending on the pipe diameter.
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10 mm
8 mm
6 mm
4 mm
2 mm
Step wedge
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Inside Wall
Outside Wall
Thinner Area
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14 inch Schedule 40 Test piece withmanufactured external defects used to
produce data on the right.
1. B-Scan Cross Section of pipe wall showing 50% external metal loss.
2. Square defect.
3. Longitudinal cross section showing 50% external metal loss from square defect.
4. Longitudinal cross section showing 50% external metal loss from round defect.
5. Round defect.
6. Color range for various thicknesses.
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1 2 4 5 63
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Riser and sealine inspection of inter field line from Wellhead Platform to
Production Platform. The pipeline was a 14 multiphase gas and
condensate line.
Wellhead Platform Preparing tools for launch
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Two tools were successfully launched in tandem from WP and receivedat PP at the anticipated time. Prior to this a comprehensive cleaning
and gauging program was conducted which identified no anomalies.
Tool with push rod about to launch Tool retrieval (at night no flash)
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Weld #1
Weld #2
Weld #3
An area in a hanging riser clamp offshore was identified as having external corrosion down
to 3.58 mm, representing 79.5% metal loss.
This was identified and reported to the customer within 90 minutes of retrieval. Later the
pipeline was shut down, the corrosion verified, and repaired.
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Heavycorrosion
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The line has since been repaired, and the metal loss verified on the
NNE side of the riser as reported. UTM detected a minimum of 3.7mm
remaining, but could not scan the whole riser due to the external
condition. A comprehensive dig sheet was provided highlighting other
concern areas which had metal loss above the clients stated threshold
of 40%.
No.
Remaining wall
thickness Wall
loss%
Meter
from
Launcher
Dimension
L x W*
(mmxmm)
Type
Reference
point
(mm)
1 3.58 79.5% 19.5 300 x 900 External Riser, Before Weld 2
2 6.28 60.5% 242 400 x 740 Internal At Weld 25
3 7.14 55.0% 182 500 x 735 Internal At Weld 20
4 8.40 47.1% 206 360 x 820 Internal After Weld 22
5 8.42 47. % 337 400 x 845 Internal At Weld 33
6 8.50 46.5% 229 250 x 670 Internal Before Weld 24
7 8.52 46.3% 290 300 x 760 Internal After Weld 29
8 8.68 45.3% 254 500 x 735 Internal After Weld 26
9 10.08 42% 20 200 x 800 External Riser, After Weld 3
10 9.17 42% 277 300 x 650 Internal At Weld 28
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A jetty line running from a jetty to refinery for 5km was inspected using
Dacons UT pig system. The pipeline was a 16 diesel line, there were no
pigging facilities and the pipeline contained unbarred tees.
Launch point direct into blinded
deadleg
Unbarred tee as a result of
alteration
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The pig was launched manually direct into the pipeline at the
jetty, and received in a blinded spool piece at the refinery.
The pig was pushed with water from Dacons pumping
container, and was specially modified for passing unbarred
tees and direct manual launch. Comprehensive cleaning and
gauging was conducted prior to launch, with no anomalies
indicated.
The pig arrived at the temporary receiving spool piece at theexpected time, and was immediately downloaded and data
analyzed in partnership with the client.
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The clients main concern was
being able to locate precisely any
defects, as the line is part
underground and excavationwould be costly. Using a
combination of data gathered by
the pig, pipeline drawings, and
Google Earth we were able to
map all the defects precisely forthe client.
Google Earth image showing a section of pipeline running along the shoreline, with defects marked
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By using all available data, the defects were pinpointed to within 10cm.
The 2 worst defects (4 and 14) were excavated and found to be precisely
located, and remaining thickness verified by UTM. These areas have now
been repaired.
Pipeline drawing corresponding to above Google Earth image, with defects marked.
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The ILI system is ideal for riser
inspections, whether with or without
production outage.
A real time cable operated system is
also available which can also be used
for underground lines, road crossings,
jetty lines etc.
The advantage is the extremely
accurate and immediate inspection
results.
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Small, lightweight tools meaneasy mobilization and launch
Limited access work area
Metallic and non-metallic pipeline Most accurate / detailed
inspection method
Simple data analysis
No wall thickness limitation Immediate onsite results
Final report within 2 weeks
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3D Visualization
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