UT Intelligent Pigging

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www.dacon-inspection.com [email protected], [email protected]


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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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1994 Dacon started business in Thailand and continued

working on upgrades or specific developments to suit clientsrequirements.


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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)



7/32www.dacon-inspection.com [email protected], [email protected]


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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


Very high frequency (50,000-150,000,000 Hz)

Mechanical

vibration


11/32www.dacon-inspection.com [email protected], [email protected]

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.


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.


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



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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UT Intelligent Pigging

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