DACON INSPECTION SERVICES I PIPESURVEY INTERNATIONAL

MFL INSPECTION OF PIPELINES

DACON INSPECTION SERVICES F O R A L L Y O U R I N S P E C T I O N N E E D S

DACON AND INLINE INSPECTION

• Dacon well-known for UT based inline inspection

• UT tools provide unrivaled inspection accuracy.

• Wide variety of pipelines ( size, service, access, length, possibility to shut down)

• UT pigging not always the best solution

• Dacon wants to be full solution provider

• Via partnership Dacon now provides MFL inline inspection

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MFL PIGGING

• MFL Pigging

• Works on the principle of magnetic flux leakage at defect locations which can be picked up by hall sensors and coils

• Can be used without couplant

• Suitable for very long pipelines

• More suitable for screening as accuracy is low compared to UT

intelligent pigging

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The MFL Tool

An MFL Tool is an autonomous inspection tool with on-board: computer, sensors, Batteries and odometers.

DACON INSPECTION SERVICES F O R A L L Y O U R I N S P E C T I O N N E E D S

The MFL Tool

DACON INSPECTION SERVICES F O R A L L Y O U R I N S P E C T I O N N E E D S

MFL Tool principle

• A defect will generate a variation in magnetic flux, which is related to size and depth of the defect

• The variation in flux will be picked up by the hall senssors/coils and translated into an

electronic signal

DACON INSPECTION SERVICES F O R A L L Y O U R I N S P E C T I O N N E E D S

MFL Tool principle

Location of magnets and coils on an actual tool.

Pipe wall

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MFL Application range

MFL Inspection can be used for:

• Oil-gas and water pipelines

• Carbon steel pipelines

• Wall thickness range depending on pipe size from 5 up to 25 mm

• Pressure up to 230 bar

• Temperature from -5 up to 80 C

• Length up to 500 km

DACON INSPECTION SERVICES F O R A L L Y O U R I N S P E C T I O N N E E D S

Our MFL Tool

• 25% diameter reduction

• Bi-directional design

• Low friction (wheels)

• Tri-axial Hall sensors

• Integrated ID/OD

• Extra High Resolution

• Current range 6” – 48”

• Short Radius Bends

• Multi diameter

• Low Flow pipelines (< 0.5 m/s)

• High Flow pipelines (> 4.0 m/s)

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Data presentation

• C-scan

• Side View

• Top view

• Internal view

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MFL Analysis and Reporting

• Types of corrosion: General corrosion, Pitting, Pinholes, Slotting and Cracks*

• Accuracy: 10% WT

• Distance and Clock Position

• Internal and External corrosion

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Each pixel represents a defect!

Data presentation easily showing the distribution of defects along your pipe line

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Results and Field Verification

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• 30” Pipelines • Crude oil • 1.5D Radius bends • Bidirectional MFL Tool • Temporary pig traps

and pump spread

Case History : Tank Farm Lines

Case Study: Bidirectional pigging

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Case History : 28” X 250 km Sub sea gas pipeline

Case study: High Flow Regime

• Gas Velocity: Flow 5 ~ 9 m/s • Tool Velocity: 3 ~ 4 m/s

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Case History : 32” X 24” X 173 km High pressure gas pipeline

Case study: Multi-diameter pigging

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Case History : 84 km X 20” Oil pipeline

Case study: Low Flow Regime

• Max pressure 7 barg @ 0.04 m/s • Net Run time 27 days !

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MFL vs UT

Magnetic Flux Leakage • Error up to 20% of nominal wall

thickness, no absolute wall thickness measurements

• More suitable for screening • Complex and lengthy data analysis

• Large tool, sometimes crane required

for handling

• Can be used in all media, no couplant required

• For very long pipelines

• Only on carbon steel

Ultrasonic Testing • Absolute wall thickness measurements,

accuracy +- 0.1 mm

• Detailed and accurate inspection results

• Instant results with easy to interpret data

• Small portable tool

• Allows for launching without launcher

• “Un-piggable” pipelines

• Need liquid filled pipe, water or clean

product.

• Length up to 50 km

• On all type dense materials, including plastics and HDPE

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MFL Pigging Demonstration Rayong Thailand

Preparing the Line, pumps and MFL pig

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MFL Demonstration Rayong Thailand

Launching the pig

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MFL Demonstration Rayong Thailand

Pumping receiving and Data download.

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MFL Demonstration Rayong Thailand

Results Overview

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MFL Demonstration Rayong Thailand

Results Section A

Defect 1

Defect 2

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MFL Demonstration Rayong Thailand

Results, Section B

Defect 1 Defect 9

Confirmation internal

DACON INSPECTION SERVICES F O R A L L Y O U R I N S P E C T I O N N E E D S

MFL Demonstration Rayong Thailand

Results Elbow and section C Elbow

Defect 2

Thin section

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MFL Demonstration Rayong Thailand

Results Section D

Defects

No confirmation

DACON INSPECTION SERVICES F O R A L L Y O U R I N S P E C T I O N N E E D S

MFL Demonstration Rayong Thailand

Results Bend section

Bend section, Data coverage on external radius

DACON INSPECTION SERVICES F O R A L L Y O U R I N S P E C T I O N N E E D S

MFL Demonstration Rayong Thailand

Results Section F

Big internal defects with confirmation

DACON INSPECTION SERVICES F O R A L L Y O U R I N S P E C T I O N N E E D S

How Can We Help?

Contact Email : info@dacon-inspection.com

Phone : +66 (0) 33 012 484-7

www.dacon-inspection.com

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