DACON INSEPECTION SERVICES

CORROSION UNDERSUPPORT

Who we are

Conventional and Advanced NDT and Inspection Services

Oil and Gas, Refinery, Petrochemical, Heavy Industry, Mining

Over 400 personnel including more than 300 inspectors

Thailand headquarters with International expertise since 1979

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Operational Excellence Our Customers

INSPECTIONTECHNOLOGY

DACON INSEPECTION SERVICES

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

The Problem

• In the area where pipelines rest on pipe supports it is a high corrosion area.

• Difficult and costly to inspect these support areas as the pipeline needs to be lifted.

• Pipeline needs to be shutdown before lifting can occur.

• Difficult to assess the actual extent of corrosion by visual inspection in the contact area.

• Until now no alternative methods existed to measure the actual remaining wall thickness at the pipe support area.

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

What Is Dacon Corrosion Under Support (CuS)

• Specifically developed for inspection of pipes and pipelines at support area.

• Used where conventional NDT methods are difficult or impossible to use.

• Highly accurate inspection tool that measures actual remaining wall thickness at pipe support areas without the need to lift off the pipe from the support.

• Developed by Dacon research and development team and is unique in its field.

• Verified results and now in wide commercial use.

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

CuS Benefits and Advantages

Lifting Pipe To Inspect Dacon CuS Method

Measurement Use UT probes to measure remaining wall thickness after lifting pipe

Use specially designed system (based on UT) to measure without lifting pipeline

Accuracy Measures defects to within +/- 0.3mm Measures defects to within +/- 0.3mm

Shutdown Pipeline may need to be shutdown in order to safely lift prior to inspection

Inspection can be performed online with no need to shut down the pipeline

Mobilization May need cranes and other lifting equipment No lifting equipment required

Logistics Lifting equipment required and site may need to be cleared Small 2 man team with minimal equipment

Cost More expensive when lifting equipment and shutdown costs are factored in

Small team with minimal mobilization costs. No shutdown costs. Cheaper and easier.

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

How It Works

• Longitudinal waves converted into shear waves

• Probe shoe is cut at 35 degree angle

• Dacon algorithm calculates Time of Flight to give remaining wall thickness

• Qualified and experienced UT Level 2 inspector interprets the data and gives final analysis.

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

INSPECTIONPROCESS

DACON INSEPECTION SERVICES

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

CuS Inspection Process

• Complete visual inspection to check the area to be inspected.

• Clean surface if necessary for excess scale and paint failure.

• Pipeline gets marked into 20mm sections with a pipeline number.

• Location transducer is used to locate possible corrosion under support.

• If corrosion is identified then measurement probeis used to measure remaining wall thickness.

• This is done by measuring each 20mm section.

• Process takes from 15 minutes to 30 minutes depending on support size.

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Operational Parameters

• Pipes must be 4” or greater and have a minimum thickness of 3mm.

• Inspecting through paint is fine (depending on paint thickness) but coatings and insulation need to be removed.

• Can be used on all materials.

• Maximum temperature is 58 Celsius.

• Can not detect if the wall loss is internal or external.

• Guided supports cannot be inspected due to tool access. These can be scanned using location tool to give an indication only.

• Does not work where pipeline and support are welded together. Also cannot be used on saddle supports if welded (non welded is fine).

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Requirements

• Dacon Corrosion Under Support probes

• Dacon Corrosion Under Support data capture equipment

• Experienced UT Level II Inspector

• Technician

• Couplant

• Insulation and cladding removed

• Access to area where pipeline contacts the pipeline support area

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Report Format

Name of part:

P1452-10-AAA3

Finding:Picture of P1452-10-AAAA3 With a Nominal thickness found at 9.40 mm measured with Ultrasonic wall thickness equipment Model Olympus DL38

Name of part:

P1452-10-AAA3

Finding:Minimum recorded wall loss was recorded at selection 1 and was foundto have a remaining wall thickness of 6.70 mm

Name of part:

P1452-10-AAA3

Finding:Minimum recorded wall loss was recorded at selection 1 and was foundto have a remaining wall thickness of 6.70 mm

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Report Format

Test location no: P1452-10-AAA3

Minimum thickness found at test location is 6.70 mm.

Inspection Conclusion

Remark:The average value in blue colour of UTM result at 6 o’clock position was used for reference and calibration.

Wall loss was found at the P1452-10-AAA3 pipe support number 3. A minimum wall thickness recorded was 6.70 mm at location 1.

Under support Section no. 1-5

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Why Use Dacon CuS

DACON INSEPECTION SERVICES

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Why use Dacon CuS

• Measures actual remaining wall thickness in pipeline wall at support area

• Other systems only quantify wall loss and do not give actual remaining wall thickness

• No need to lift off the pipeline

• Can be done online (no need to shutdown)

• Significant cost savings in logistics and shut down costs

• Any material and any product in pipeline

• Small equipment and only requires 2 man team

• Verified results and tried and tested system

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Cost Benefit

Inspection Cost Comparison

70,000 $

60,000 $

50,000 $

40,000 $

30,000 $

20,000 $

10,000 S

0 $

Dacon CuS Lift Pipeline

InspectionLogistics

Inspection

+200%

ShutdownShutdown

Logistics

Inspection

Shutdown

Logistics

DACON INSEPECTION SERVICES

CASE STUDIES

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Refinery

• Inspection of pipe racks

at refinery.

• Prior to shutdown.

• 260 supports

• Online Inspection

• Successful Inspection

• Results verified.

• No need to lift pipeline

Description Solution

• CuS Tool

• Inspector and Technician

• 2 Months

• Effective shutdown

planning.

• Cost savings.

• Accurate analysis

of pipeline condition

at support areas.

Result Benefit

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Offshore Platform

• Inspection of production

piping.

• Due to corrosion concerns

after visual inspection

• 20 supports

• Online Inspection

• Successful Inspection

• Results verified.

• No need to lift piping

Description Solution

• CuS Tool

• Inspector and Technician

• 4 days

• Quick answer.

• Cost savings.

• Accurate analysis of

piping condition at

support areas.

Result Benefit

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

Summary

• Asia Based Company With International Expertise

• Saves Time and Money

• No Need For Costly Shutdowns and Lifting The Pipe

• Measures Actual Remaining Wall Thickness

• Ideal For Shutdown Planning, Scheduled Maintenance and Verification

• Easy Mobilization and Small Inspection Team and Equipment

DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T

How Can We Help?

Contact

Tim ShawChief Marketing Officer

Email : timshaw@dacon-inspection.com

Mobile Phone : +66 (0) 89 245 9966

www.dacon-inspection.com