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TRANSCRIPT
Service Safety Quality Innovation
Assessment of Corrosion under Insulation and Engineered Composite Wraps using
Pulsed Eddy Current Techniques.
• Introductions
• Brief overview of TRAC Oil & Gas Ltd.
• Factors affecting Probability of Detection - Review
• Perceived current challenges
• NDT methods to be verified – Overview and work
carried out to date:
• Radiography,
• Pulsed Eddy-Current (PEC)
Presentation Outline
Established in 1999:
Incorporated in Scotland, based initially in Aberdeen. 10 years of growth & diversification. 2009 creation of group & subsidiary companies.
Group turnover circa £50m.
Steady state and controlled growth for initial 10 years, accelerated growth following 2009 reorganisation.
TRAC Oil & Gas:
Turnover circa £15m
Rope Access
Engineering Support
Inspection & Testing
Remote Inspection
Marine Class Survey& Repair
Mechanical & Electrical Trades
Rigging & Lifting
Fabric Maintenance
Fire Protection Systems
Training
Rope Access
Engineering Support
Inspection & Testing
Remote Inspection
Marine Class Survey& Repair
Mechanical & Electrical Trades
Rigging & Lifting
Fabric Maintenance
Fire Protection Systems
Training
ServicesServices
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Accreditations & Approvals
ISO 9001: 2008 ISO 14001: 2004 ISO 18001: 2007 ISO 17020:2012
Full Member
Accreditations
Memberships & Affiliations
Class Approvals & Hull Thickness Measurement Approvals
402a 402b
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Perceived Current Challenges
In-Service Inspection relative to:
• Corrosion Under Insulation (CUI)• Evaluation of Remaining Wall Thickness
under Blisters/Surface Scabs• Inspection of and through Composite
Engineered Wraps
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Perceived Current Challenges
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington 8
Competency of the Company & Personnel Well developed and verified procedures Appropriate Acceptance Criteria Effective scanning of the component -• Area of the reflecting surface Orientation of the defect Shape of the defect
Factors Affecting Probability of Detection (POD)
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
What are we looking for & how do we know we will find it?
This is the pre-requisite for all Inspection / NDT activities.
Identify what the degradation process is likely to be and apply the most appropriate method/technique to find and quantify it.
Verify the procedure under site conditions – coating / surface condition, real degradation – not artificial flaws or verify that the artificial flaws truly represent the expected degradation.
NDT personnel competent to carry out the activities?
Certification is not a measure of competence
Project consists of:
• Market survey and evaluation of Pulsed Eddy-Current equipment available.
• Source relevant in-service samples with typical and varied degradation
• In-House research to be verified by competent Third Parties
• Research and source suitable additional and/or alternatives to Pulsed Eddy-current techniques
• Research and trial suggested innovative methods
Project Outline
Market survey and evaluation of Pulsed Eddy-Current equipment available.
In total three (3) Pulsed Eddy-Current systems were evaluated.
Two systems were found to be relevant to our project.
These were Eddyfi Lyft and Maxwell PECT
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Eddyfi LYFT Instrument
• Materials:
Carbon steel
• Lift-off range:
up to 300mm (12”)
• Wall thickness:
up to 100mm (4”)
• Weather jackets:Aluminium, stainless steel, galvanised steel• Probe:PEC-089-G2-HT05SFootprint 95.2 mmCircumferential Footprint 124.5mm
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
MAXWELL PECT Instrument
• Materials:Carbon steel and low-alloyed steel
• Lift-off range:0 – 250 mm (0-10”)
• Wall thickness range:3 – 50 mm (0.12”-2”)
• Insulation covers:Non metal, aluminium and stainless insulation covers; limited galvanised weather sheeting
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Due to our positive experiences offshore using radiographic techniques we introduced this method to the project. Examples below:
Radiography
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Radiography
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Radiography
Initial trials with Sentinel QSA Global Open Vision equipment.
Unsuccessful due to Safety issues
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Radiography
Two Digital Detector Array (DDA) systems were evaluated
Little or no difference in technical performance
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
The project continued combining Pulsed Eddy-Current & Digital Radiography
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
PEC Probe
Phase 3 The reception phase during which magnetic sensors measure the decay of the eddy currents as they diffuse into the material thickness
Phase 2 The cut-off phase which induces strong eddy currents into the component Whenthe magnetic field emission is stopped abruptly
Phase 1 The emission phase (the pulse) during which the probe injects magnetic fieldsthat penetrate and stabilize in the component thickness
Principles PEC
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Footprint Definition
• The footprint is the sensitivity area of the probe on the inspected component.
• The size of the footprint is affected by:• The probe size and configuration• The coating\insulation thickness• The jacket material• The WT of the component
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
PEC v UT
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
PEC v UT• Averaging Effect
• Point 1 a Dip
• Point 2 A Peak
• Point 3 PEC Averaging
1
2
3
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Initial Work
Sample : Pipe OD 323mm
Thickness: 8.3mm
Length 1200mm
Engineered Composite Wrap 9mm
• Sample inspected after being removed from service (picture 1)
• After inspection a section of pipe was cut and the ID exposed to reveal a large scabbed area after initial cleaning. (picture 2)
(Pic 1)
(Pic 2)
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Initial Work
• The Pipe was sent for cleaning and on return reviled the sever corrosion on the ID at what was the 6 O’clock position (picture 3)
(Pic 3)
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Initial Work – Anomaly Report
• The original anomaly report identified two areas
• Area of anomaly A 80mm x 30mm 6 o’clock position 5.2mm minimum
• Area of anomaly B 20mm x 30mm 6 o’clock position 4.9mm minimum
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Initial Work – PEC Results
• PEC Results show large area of general wall loss containing deep pitting along the length. The minimum reading recorded by the PEC 4.2mm.
(picture 3)
0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 110.0 120.0 130.0 140.0 150.0 160.0 170.0 180.0 190.0 200.0 210.0 220.0 230.0 240.0 250.0 260.0 270.0 280.0 290.0 300.0 310.0 320.0 330.0 340.0 350.0 360.0 370.0 380.0 390.0 400.0 410.0 420.0 430.0 440.0 450.0 460.0 470.0 480.0 490.0 500.0 510.0 520.0 530.0 540.0 550.0 560.0 570.0 580.0 590.0 600.0 610.0 620.0 630.0 640.0 650.0 660.0 670.0 680.0 690.0 700.0 710.0 720.0 730.0 740.0 750.0 760.0 770.0 780.0 790.0 800.0 810.0 820.0 830.0 840.0 850.0 860.0 870.0 880.0 890.0 900.00.0 7.2 7.8 7.3 7.4 7.8 8.1 7.9 8.2 8.1 8.1 8.3 7.7 7.9 7.8 8.2 7.8 8.0 8.2 8.3 7.6 7.6 7.5 7.5 7.8 7.8 7.8 7.6 7.5 7.6 7.7 7.6 7.7 7.9 7.9 7.6 7.6 7.7 7.6 7.8 7.7 7.8 7.7 7.7 7.7 7.7 7.5 7.8 7.9 8.0 8.1 8.0 7.9 8.0 7.9 7.9 8.0 8.0 8.0 8.2 7.9 7.8 7.7 7.8 8.2 8.1 7.9 7.7 7.8 7.9 7.6 7.9 7.5 8.1 8.0 8.3 7.1 7.7 7.3 7.5 7.4 8.1 7.9 7.7 7.4 7.5 7.4 8.0 8.0 7.9 7.625.3 6.9 7.5 7.7 7.8 7.8 7.6 7.7 7.9 8.0 8.1 8.4 8.3 7.1 7.8 7.5 7.8 7.5 7.8 7.6 7.6 7.4 7.4 7.2 7.6 7.1 7.5 7.7 8.2 7.8 7.5 7.2 6.9 7.9 7.6 8.1 7.6 7.6 7.3 7.7 7.1 7.6 7.7 7.8 7.7 7.4 7.6 7.5 7.8 7.7 8.0 8.3 7.9 8.2 7.7 7.8 7.7 7.9 8.2 7.8 8.4 8.1 7.9 7.7 8.2 8.0 8.1 8.0 8.1 7.6 7.6 7.7 7.6 7.5 7.9 7.5 7.9 7.7 7.5 7.4 7.5 7.5 7.7 7.9 7.8 7.6 7.4 7.3 7.6 7.750.7 7.7 6.7 7.5 7.2 7.6 7.6 7.7 7.9 7.8 7.7 7.1 7.1 6.9 7.5 7.2 7.3 7.5 6.8 6.6 6.9 7.1 7.8 7.0 7.4 7.0 6.7 6.9 6.9 7.4 7.0 7.6 7.5 7.6 7.5 7.2 7.2 7.1 7.3 7.5 7.4 7.5 7.1 7.4 7.0 7.1 7.7 7.7 7.7 7.8 7.8 7.3 7.7 7.4 7.7 8.0 7.8 7.9 7.9 7.5 7.6 7.5 8.0 8.0 7.9 7.9 7.7 7.5 7.6 7.6 7.7 7.7 7.9 7.6 7.7 7.5 7.7 7.4 7.6 7.3 7.7 7.5 7.5 7.4 7.4 7.0 7.6 7.5 7.976.0 6.9 6.8 7.5 6.8 7.1 6.6 6.7 6.7 6.8 7.1 7.5 7.1 6.7 6.7 6.4 6.5 6.9 6.4 7.2 7.1 7.0 6.1 5.9 6.8 6.8 6.7 6.7 6.0 6.6 6.2 6.4 6.5 7.0 6.9 7.2 6.7 7.0 6.7 6.2 6.6 6.8 6.7 6.9 7.2 6.8 6.8 6.5 7.1 7.1 7.4 7.3 7.5 7.0 7.1 6.8 7.2 7.0 7.3 7.2 7.7 7.4 7.2 7.2 7.2 7.3 7.4 7.3 7.6 7.5 7.0 7.3 7.1 7.1 7.9 7.4 7.5 7.3 6.9 7.0 7.1 7.3 7.1 7.7 7.0 7.4 7.4 7.2 7.6101.4 6.6 5.9 6.2 5.9 6.5 6.5 6.7 6.7 6.7 5.8 6.4 5.5 5.9 6.2 6.2 6.3 6.7 6.2 5.6 5.6 5.9 6.2 6.1 6.0 6.1 5.9 6.5 6.1 6.3 6.6 6.5 7.1 7.0 6.4 6.5 6.6 6.0 6.1 6.5 6.1 6.6 5.7 6.1 6.1 6.2 6.4 6.6 7.0 6.9 7.0 6.8 6.7 6.8 6.5 7.0 7.1 6.7 7.0 6.7 6.7 6.8 7.2 7.2 7.2 6.8 6.8 7.0 6.9 7.0 6.9 7.2 7.2 7.1 6.9 6.4 6.5 6.9 6.9 7.0 7.1 7.1 7.3 6.7 7.0 7.1 6.8 7.2 7.1 6.9 7.0126.7 5.6 5.8 6.2 6.1 5.9 5.9 6.0 6.4 6.4 6.7 6.0 5.8 5.3 5.3 5.2 5.9 6.0 5.9 6.1 5.3 5.0 5.2 5.2 5.7 5.6 5.7 5.9 5.0 5.9 5.9 6.1 5.0 5.8 6.2 5.8 5.2 5.9 5.3 5.0 5.2 5.7 5.9 6.0 6.1 5.1 5.8 5.4 4.8 5.7 5.9 5.8 6.1 6.3 5.7 5.9 5.7 6.3 5.9 5.9 6.2 5.5 6.1 6.3 6.5 6.4 6.3 6.5 6.5 6.4 6.1 6.3 6.6 6.1 6.5 6.1 6.7 6.0 5.9 5.6 6.1 6.5 6.5 7.0 6.0 6.2 6.2 6.1 6.6 6.3 7.1152.1 5.3 5.2 5.1 5.7 5.9 5.7 6.1 5.8 6.0 5.3 5.0 5.4 5.1 4.8 5.0 5.6 5.5 5.7 4.7 4.9 5.1 5.4 5.4 5.4 5.7 5.6 4.9 5.1 5.2 5.7 6.1 6.2 6.1 5.8 5.7 5.4 4.9 4.7 4.8 5.3 5.3 5.2 5.5 5.4 5.5 5.1 5.5 5.8 5.5 5.6 5.8 5.3 6.0 5.7 5.8 5.6 5.7 5.3 5.4 5.4 5.8 5.9 6.0 6.0 5.8 5.7 5.7 5.2 5.7 5.7 5.7 5.6 5.7 5.4 5.2 5.1 5.2 5.3 5.7 5.8 6.1 6.4 6.0 5.6 6.0 6.0 5.3 6.3 6.0 6.0 6.1177.4 4.8 4.9 5.2 4.2 4.7 5.0 5.1 5.3 5.5 5.4 5.0 5.4 5.3 5.3 5.2 4.3 5.0 5.4 5.1 5.1 5.0 4.2 4.4 4.7 5.3 5.7 5.6 4.9 4.9 5.5 5.4 5.9 5.7 5.6 6.1 5.8 5.3 5.3 5.3 5.6 4.8 5.4 5.6 5.1 5.2 5.2 5.1 5.1 5.3 5.5 5.0 5.7 5.5 4.8 5.3 5.4 5.3 5.5 5.2 4.8 5.8 5.6 5.4 5.2 5.3 5.5 5.5 5.7 5.1 5.5 5.7 5.6 5.3 5.2 5.3 5.2 4.9 4.7 4.9 4.8 5.3 5.9 6.2 6.2 6.4 5.8 6.0 6.1 5.9 5.7202.8 5.6 4.1 4.6 4.8 5.3 4.9 5.5 5.5 5.5 5.2 5.0 5.2 5.4 4.6 5.6 5.3 5.6 4.8 4.9 4.3 5.1 5.5 5.1 5.5 5.7 5.1 5.3 5.1 5.4 5.0 5.8 5.6 5.8 4.6 5.4 5.1 5.5 5.7 5.6 5.4 5.7 5.1 5.4 5.3 5.3 5.6 5.2 5.5 5.1 4.9 4.9 5.1 5.2 5.6 5.4 5.2 4.9 5.2 5.1 5.2 5.3 5.3 4.7 5.4 5.4 5.3 5.2 5.4 5.1 5.4 5.5 5.3 5.3 4.9 4.5 4.7 4.9 5.3 5.8 6.1 6.2 6.3 5.6 5.7 6.7 6.4 6.7 6.3 6.3228.1 5.4 5.4 5.0 4.9 5.3 5.2 5.1 5.3 4.8 5.4 5.4 5.4 5.3 5.3 5.7 4.6 5.6 6.0 5.8 5.9 5.3 4.8 4.9 5.4 5.0 5.7 6.2 5.9 5.4 5.3 4.9 5.8 5.9 5.7 6.4 5.7 5.8 5.4 5.2 6.2 5.9 5.9 6.2 5.5 5.6 5.3 5.3 5.2 5.5 5.4 5.5 5.4 5.4 5.2 5.1 5.5 5.7 5.6 5.5 5.2 5.3 5.1 5.1 5.5 5.3 5.4 5.6 5.3 5.8 5.2 5.2 5.5 5.4 5.5 5.3 5.1 5.2 5.0 5.5 5.2 6.2 6.4 6.7 6.4 6.7 6.8 6.5 6.8 6.8253.5 6.2 3.3 6.1 5.4 5.9 5.5 6.1 5.9 5.8 5.3 5.4 5.1 6.5 6.2 6.7 6.5 6.5 6.0 4.7 5.2 5.5 5.1 6.1 5.8 5.8 5.9 6.0 5.3 5.8 5.9 6.2 6.0 6.1 5.2 6.3 5.7 5.4 5.9 6.1 6.4 6.3 6.0 6.1 6.0 5.5 6.6 5.7 6.2 5.5 6.2 4.7 5.7 5.5 5.8 5.6 5.7 6.1 4.6 5.8 5.1 5.2 5.4 5.8 5.7 5.7 5.5 5.2 5.3 5.6 5.7 6.0 6.2 6.2 5.7 5.7 5.8 5.4 6.1 6.7 6.7 6.7 6.6 6.7 6.5 6.9 7.1 7.0 7.5278.8 5.6 6.5 6.8 6.9 5.8 6.5 6.1 5.9 6.4 6.6 6.9 6.2 6.3 6.1 6.3 5.5 6.7 6.9 7.0 6.8 5.8 5.7 5.8 6.1 6.5 6.9 7.0 6.9 5.8 6.8 6.1 7.0 5.8 6.9 7.5 7.3 6.5 6.4 6.5 6.5 6.4 7.5 7.3 6.4 7.1 6.6 6.6 7.1 6.3 6.7 6.3 6.4 6.2 6.3 6.3 6.1 6.3 6.4 6.4 6.8 6.2 5.7 5.8 5.9 6.1 6.4 6.5 6.1 6.0 5.8 6.3 6.6 6.7 6.6 6.7 6.6 6.7 6.7 6.2 6.5 6.8 7.1 7.7 7.7 7.6 7.6 7.4 7.5304.2 6.7 6.3 6.6 7.2 6.7 7.0 7.3 7.7 7.1 7.3 6.7 6.9 6.8 7.1 7.1 7.3 7.2 7.2 7.0 5.8 5.6 6.4 7.2 7.1 7.9 7.7 6.3 7.1 6.6 7.0 7.4 7.2 7.5 7.5 7.0 7.4 6.9 7.1 6.9 7.6 7.9 7.8 6.6 7.2 7.0 7.0 7.2 7.6 7.3 7.4 7.3 7.3 6.7 6.5 6.7 6.7 7.0 7.0 6.9 6.0 6.5 6.5 6.0 6.9 7.0 6.6 6.7 6.4 6.3 6.2 6.4 6.8 7.1 7.0 6.8 6.7 6.6 6.8 6.8 7.1 7.3 7.7 8.2 7.1 7.0 7.2 7.6 8.5 8.2329.5 6.8 7.5 6.5 7.4 7.5 6.7 7.2 7.7 7.7 7.7 7.0 7.8 6.7 6.8 7.5 6.5 7.5 7.4 7.5 7.0 7.4 6.8 6.8 7.1 7.6 7.7 8.1 7.3 7.2 7.2 7.1 6.9 7.7 7.9 8.2 7.4 7.5 7.4 7.3 7.2 8.0 8.6 8.1 8.3 7.7 7.7 7.4 7.7 8.1 8.1 7.8 8.0 7.4 7.1 7.0 6.9 7.1 7.2 7.4 6.7 6.2 6.4 6.2 6.6 6.1 6.5 6.7 6.4 6.7 6.2 6.4 6.6 6.5 6.8 6.9 7.1 7.4 7.0 7.0 7.2 6.8 7.8 8.3 7.7 7.6 7.8 7.6 7.5354.9 7.6 7.2 7.6 6.7 7.1 7.6 7.4 8.1 7.6 7.1 7.5 6.7 7.5 6.9 7.6 7.8 7.5 7.8 7.0 7.4 6.7 7.2 7.7 7.7 8.1 8.2 7.7 6.6 6.9 7.2 7.4 8.2 8.2 7.9 7.8 8.1 7.6 7.3 7.9 8.0 7.8 8.0 7.3 8.5 7.6 7.4 8.4 7.6 7.8 7.7 7.4 7.4 6.9 7.0 7.2 6.7 7.2 6.8 6.4 6.2 6.3 6.1 6.1 6.7 6.3 6.2 6.1 6.2 5.9 6.4 6.4 6.7 6.9 7.2 7.0 7.0 6.8 7.2 7.3 7.4 7.6 7.8 7.9 7.8 7.6 7.8 8.0 8.0 8.4 8.2
3 O’clock
6 O’clock
9 O’clock
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Inspection carried out on off-shore facility
Sample : Pipe OD 798mm
Thickness: 6.35mm
Length 750mm
Engineered Composite Wrap 9mm
• Sample inspected off shore still in service. (picture 1)
(picture 1)
Example 1
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
• The original anomaly report identified many areas of wall loss
• All anomaly's predominantly between 3-9 O’clock positions
• Minimum reading Location 1 3.8mm
• Minimum Reading Location 2 3,6mm
(picture 3)
Example 1
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
• PEC Results show large area of general wall loss containing deep pitting along the length. The minimum reading recorded by the PEC 4.2mm.
0.0 14.8 29.6 44.4 59.3 74.1 88.9 103.7 118.5 133.3 148.1 163.0 177.8 192.6 207.4 222.2 237.0 251.9 266.7 281.5 296.3 311.1 325.9 340.7 355.6 370.4 385.2 400.0 414.8 429.6 444.4 459.3 474.1 488.9 503.7 518.5 533.3 548.1 563.0 577.8 592.6 607.4 622.2 637.0 651.9 666.7 681.5 696.3 711.1 725.9 740.7
848.7 6.0 6.0 5.9 6.0 6.0 6.1 6.1 6.2 6.2 6.2 6.2 6.2 6.2 6.1 6.2 5.9 5.7 5.9 5.9 5.9 6.1 6.0 6.0 6.2 6.1 6.0 6.0 6.0 6.0 6.2 6.1 6.0 6.3 6.3 6.4 6.4 6.2 6.3 6.3 6.2 6.2 6.3 6.3 6.2 6.0 6.1 6.1 5.6 5.2
808.2 5.8 5.7 5.9 5.9 6.1 6.0 5.9 6.0 6.2 6.2 6.3 6.3 6.2 6.3 6.1 6.2 6.2 6.3 6.3 6.3 6.2 6.4 6.4 6.3 6.3 6.2 6.3 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.5 6.4 6.2 6.2 5.9 5.9 5.8 5.6 5.3 5.1 5.9 5.4 5.2 5.2 5.2
767.8 5.4 5.2 5.0 4.9 5.1 5.0 5.2 5.2 5.4 5.6 5.7 5.8 5.8 5.8 5.8 5.4 5.6 5.9 6.0 6.2 6.1 6.0 6.0 6.1 6.1 6.2 6.3 6.2 6.1 6.1 6.2 6.1 6.1 6.3 6.3 6.2 6.3 6.2 6.1 6.0 5.9 6.0 5.8 5.7 5.4 5.2 5.2 5.3 4.8 4.4 4.7
727.4 4.0 4.1 4.1 4.1 4.1 4.2 4.3 4.2 4.2 4.2 4.1 4.3 4.5 4.5 4.1 4.1 4.1 4.5 5.0 5.1 5.1 5.0 5.0 5.3 5.6 5.7 5.6 5.2 5.1 5.2 5.3 5.5 5.3 5.4 5.4 5.5 5.4 5.4 5.3 5.2 5.1 5.1 4.9 4.7 4.5 4.6 4.8 4.9 4.5 4.4 4.5
687.0 3.5 4.1 3.6 3.5 3.7 3.6 3.4 3.5 3.4 3.4 3.6 3.8 3.8 3.6 3.4 3.5 3.8 4.2 4.2 4.5 4.6 4.6 4.3 4.3 4.5 4.7 4.9 4.9 4.7 4.6 4.7 4.6 4.4 4.5 4.6 4.5 4.4 4.5 4.7 4.5 4.4 4.5 4.5 4.5 4.5 4.5 4.6 4.7 4.3 4.2
646.6 3.5 3.4 3.4 3.3 3.3 3.4 3.5 3.5 3.3 3.4 3.6 3.8 3.9 3.7 3.6 3.6 3.5 3.8 4.0 4.1 4.3 4.4 4.4 4.3 4.4 4.6 4.6 4.7 4.7 4.6 4.4 4.5 4.2 4.4 4.4 4.4 4.4 4.5 4.3 4.3 4.4 4.7 4.6 4.6 4.5 4.6 4.7 4.8 4.4 4.1 4.4
606.2 3.6 3.8 3.9 3.8 3.8 3.7 3.8 4.0 4.1 4.0 4.0 4.1 4.0 3.8 3.8 3.8 3.7 3.8 4.1 4.2 4.2 4.2 4.3 4.3 4.3 4.3 4.4 4.6 4.5 4.6 4.5 4.2 3.9 3.9 4.0 4.0 3.7 4.0 4.3 4.3 4.3 4.3 4.3 4.3 4.3 4.4 4.7 4.8 4.6 4.2
565.8 3.6 3.7 3.8 4.1 3.9 3.7 3.9 4.1 3.9 3.9 3.9 3.9 3.9 3.9 4.0 4.0 3.9 3.9 3.9 3.9 3.8 4.1 4.1 4.1 3.9 4.0 4.2 4.2 4.2 4.3 3.9 3.8 3.7 3.8 3.8 3.6 3.6 3.9 4.2 4.1 4.3 4.1 4.2 4.1 4.2 4.3 4.7 4.7 4.1 4.3
525.4 4.1 4.0 3.7 4.0 4.1 4.2 4.2 4.1 3.8 3.7 3.7 3.5 3.7 4.0 4.2 4.1 4.0 3.9 4.1 4.2 4.0 4.1 4.3 4.2 4.0 3.9 4.0 4.2 4.3 4.2 4.1 4.1 3.8 4.3 4.3 4.2 4.1 4.1 4.3 4.3 4.4 4.3 4.2 3.7 3.7 3.9 4.4 4.8 4.4 4.4
484.9 4.4 4.2 4.2 4.1 3.8 4.0 4.1 3.6 3.6 3.7 3.9 3.7 3.7 3.8 3.8 4.2 4.2 4.3 4.1 4.2 4.0 4.1 4.0 3.9 4.1 4.3 3.9 4.0 4.2 4.4 4.5 4.3 4.1 4.2 4.0 4.0 4.3 4.3 4.1 3.8 3.9 4.1 4.5 4.9 4.6 4.5 4.8 4.7 4.5 4.2 4.4
444.5 4.2 4.2 4.2 4.2 4.1 4.0 3.9 4.0 4.1 3.8 3.6 4.0 4.0 4.1 4.0 3.8 3.5 3.6 3.5 3.9 3.9 3.8 3.8 4.0 3.9 3.8 3.7 3.9 4.1 4.2 3.9 3.7 3.5 3.8 4.0 4.0 4.1 3.9 4.0 3.9 3.7 3.8 4.0 4.1 4.0 3.9 3.8 3.7 4.2 4.5 4.4
404.1 4.3 4.1 4.1 4.1 4.2 4.4 4.2 4.0 4.2 4.0 4.0 4.1 3.9 3.9 3.9 4.0 4.1 4.2 4.2 4.3 4.2 4.1 4.1 4.3 4.2 4.2 4.0 3.9 3.9 4.0 4.1 4.2 4.1 4.0 4.0 4.0 4.0 4.1 4.1 4.2 4.0 3.8 3.8 3.8 4.1 4.2 4.1 4.4 4.4 4.7 4.8
363.7 4.2 4.1 4.2 4.1 4.2 4.0 3.9 4.1 4.1 4.1 3.9 4.0 4.2 4.3 3.9 3.7 3.9 4.0 3.7 3.5 3.4 3.8 3.8 3.8 3.9 3.7 3.9 4.0 4.0 3.7 3.6 3.9 3.8 4.0 3.9 4.0 3.8 3.6 3.7 3.7 3.7 3.9 4.1 4.1 3.8 3.6 3.7 4.0 4.4 4.2 4.3
323.3 4.6 4.7 4.2 4.1 4.2 4.2 4.3 4.6 4.4 4.3 4.2 4.4 4.5 4.3 4.3 4.4 4.2 4.3 3.9 3.9 3.8 4.0 4.1 4.3 4.2 4.2 4.2 4.2 4.6 4.6 4.3 4.2 4.5 4.6 4.1 4.1 4.3 4.1 4.3 4.1 4.0 4.0 4.1 4.6 4.5 4.2 4.0 4.2 4.5 4.3 4.2
282.9 4.5 4.5 4.2 4.1 4.1 4.3 4.5 4.5 4.1 4.2 4.3 4.3 4.1 3.5 4.0 4.3 4.2 4.1 4.1 4.1 4.1 4.2 4.1 4.2 4.2 3.9 4.1 4.3 4.2 4.2 4.4 4.4 4.3 4.3 4.3 4.3 4.1 4.3 4.2 4.2 4.3 4.4 4.2 4.1 4.2 4.1 4.2 4.4 4.1 4.2
242.5 4.3 4.3 4.3 4.2 4.2 4.3 4.1 3.8 3.9 4.1 4.0 3.8 3.9 4.0 4.2 4.0 4.1 3.9 3.9 3.9 4.0 4.2 4.1 3.9 4.0 4.3 4.1 4.1 4.1 4.0 4.0 4.1 4.1 4.1 4.0 3.9 3.9 3.8 4.0 4.2 4.4 4.2 4.3 4.5 4.5 4.6 4.4 4.5 4.2 4.3 4.7
202.1 4.5 4.2 4.6 4.6 4.5 4.4 4.5 4.6 4.6 4.5 4.5 4.3 4.3 4.2 4.1 4.3 4.4 4.3 4.0 4.3 4.4 4.4 4.4 4.3 4.4 4.4 4.4 4.3 4.4 4.4 4.3 4.2 4.0 4.1 4.0 4.0 4.0 4.2 4.3 4.5 5.0 4.8 5.0 5.0 4.9 4.9 5.0 4.6 4.5 4.7
161.6 5.4 5.5 5.7 5.3 5.4 5.7 5.7 5.8 5.9 5.8 5.7 5.6 5.6 5.5 5.4 5.6 5.7 5.7 5.6 5.4 5.3 5.6 5.6 5.4 5.5 5.4 5.6 5.3 5.3 5.2 5.4 5.3 5.4 5.4 5.2 5.4 5.6 5.5 5.2 5.1 5.1 5.4 5.5 5.4 5.4 5.3 5.3 5.0 4.5 4.6 4.9
121.2 6.1 6.1 6.1 6.1 6.2 6.2 6.2 6.3 6.3 6.3 6.3 6.2 6.3 6.1 6.1 6.1 6.3 6.1 6.2 6.2 6.1 6.1 6.1 6.1 6.1 6.1 6.0 5.9 6.0 6.1 6.2 6.0 6.2 6.2 6.2 6.1 6.0 6.1 5.8 5.7 5.8 5.8 5.7 5.7 5.7 5.5 5.0
80.8 6.2 6.2 6.3 6.2 6.3 6.3 6.2 6.3 6.3 6.3 6.2 6.3 6.2 6.4 6.3 6.4 6.3 6.2 6.3 6.2 6.2 6.3 6.2 6.4 6.1 6.4 6.4 6.3 6.2 6.3 6.3 6.3 6.4 6.3 6.2 6.2 6.2 6.2 6.1 5.9 6.0 5.9 5.4 5.1 5.2 5.6 5.8 5.5
40.4 5.9 6.0 6.1 6.1 6.1 6.2 6.1 6.2 6.2 6.1 6.1 6.0 6.0 6.1 6.1 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.3 6.2 6.2 6.3 6.3 6.2 6.2 6.2 6.2 6.1 6.2 6.2 6.2 6.3 6.2 6.2 6.1 6.0 5.9 5.9 6.0 5.5 5.3 5.3
0.0 5.9 5.7 5.8 5.9 6.1 6.1 6.2 6.1 6.1 6.1 6.1 6.1 6.1 6.0 6.0 6.2 6.1 6.2 6.1 6.1 6.1 6.1 6.0 6.1 6.1 6.2 6.1 6.2 6.2 6.2 6.2 6.1 6.2 6.2 6.2 6.2 6.3 6.2 6.2 6.2 6.1 6.0 5.9 5.9 6.1 5.9 5.3 5.2 5.4
12 O’clock
3 O’clock
6 O’clock
9 O’clock
Location One Location Two
Example 1
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Table shows 14 test point inspected off shore in service.
UT & PEC Comparisons
Line ID Test PointNom Min Reading Difference Indication Position
(mm) UT (mm) PEC (mm) (mm) UT PEC
2" Test Point 12 3.9 2.4 2.7 -0.3 6 o'clock 5-10 o'clock
2" Test Point 2 3.9 2 2.9 -0.9 not identified 4-10 o'clock
2" Test Point 3 3.9 2 2.7 -0.7 not identified 4-10 o'clock
3" Test Point 45 5.5 2.3 3.7 -1.4 6 o'clock 1-11 o'clock
4" Test Point 19 6.02 2 3.6 -1.6 8 o'clock 4-8 o'clock
4" Test Point 21 6.02 2.8 3.7 -0.9 4 o'clock 4-8 o'clock
8" Test Point 8 8.2 2.8 4.2 -1.4 3 o'clock 3-6 o'clock
8" Test Point 11 8.2 3.5 3.5 0 6 o'clock 5-8 o'clock
10" Test Point 6 6.35 3.7 3.3 0.4 3-6 o'clock full circ
10" Test Point 1 6.35 3.8 3.4 0.4 3-9 o'clock 2-10 o'clock
10" Test Point 2 6.35 3.6 3.5 0.1 3-9 o'clock 2-10 o'clock
10" Test Point 11 6.35 3 3.9 -0.9 1-5 o'clock, 8-11 o'clock full circ
12" Test Point 48 8.38 1 3.3 -2.3 6 o'clock 6 o'clock
12" Test Point 49 8.38 1 3.5 -2.5 6 o'clock 6 o'clock
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 2
• Nominal 7.92mm
• PEC (48% Remaining) 3,8mm
• Measured remaining beforewrap applied 3mm
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 3
• Pitting with leak path through to wrap PEC detected 68% remaining (pit approx. 10 mm diameter hole approx. 5mm)
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 4
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 4
• A-scan for Position E9
• Red line calibration White Line the A-scanfor the reading Notice they follow thesame path until the white A-scan falls off4ms
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 5
• Remaining wall measured through blister then blister removed.
• PEC measured 7.2 remaining
• UT measured 6.8
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
PEC, Radiography & Scanning
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 6
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 6
Section 0-24
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 6
Section 36-68
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 6
Section 74-100
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 7
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 7
Section 22-54
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 7 - PEC Results
Section 10-42
AB
CD
EF
GH
IJ
KL
MN
OP
Q
mm0
2040
6080
100
120
140
160
180
200
220
240
260
280
300
320
10
6.76.6
7.07.3
7.07.1
7.06.9
6.96.7
6.97.0
7.17.1
7.17.3
7.1
220
6.96.8
6.97.1
6.96.9
6.86.7
6.66.5
6.46.6
6.66.6
6.76.7
6.8
340
7.26.9
6.77.0
7.07.0
7.06.9
6.96.8
6.76.8
6.76.7
6.76.8
7.0
460
7.36.9
7.07.2
7.27.2
7.17.1
7.06.9
6.97.0
6.96.9
6.86.9
7.0
580
7.47.1
7.17.3
7.27.2
7.17.1
7.17.1
7.07.1
7.17.1
7.07.0
6.9
6100
7.67.3
7.27.2
7.17.1
7.17.1
7.17.1
7.17.2
7.27.2
7.17.1
7.1
7120
7.67.5
7.47.3
7.17.1
7.17.1
7.17.1
7.17.2
7.37.3
7.17.2
7.2
8140
7.67.7
7.67.4
7.27.2
7.27.0
7.07.0
7.17.3
7.37.3
7.27.3
7.3
9160
7.57.7
7.77.5
7.47.3
7.37.1
7.17.0
7.07.1
7.27.3
7.57.3
7.3
10180
7.47.6
7.67.6
7.57.5
7.57.2
7.27.0
6.97.1
7.17.2
7.27.3
7.3
11200
7.37.4
7.57.6
7.37.6
7.57.4
7.37.2
7.07.1
7.17.1
7.17.2
7.2
12220
7.37.4
7.47.5
7.37.6
7.57.5
7.57.4
7.27.2
7.27.1
7.17.1
7.1
13240
7.47.4
7.47.4
7.27.5
7.47.5
7.57.5
7.37.3
7.37.3
7.27.1
7.1
14260
7.47.4
7.47.3
7.27.2
7.27.4
7.37.4
7.57.5
7.57.4
7.37.2
7.1
15280
7.57.5
7.57.3
7.27.1
7.17.1
7.17.2
7.37.5
7.57.5
7.57.3
7.3
16300
7.47.5
7.57.4
7.37.1
7.17.0
7.07.0
7.17.3
7.47.5
7.47.5
7.4
17320
7.27.5
7.57.5
7.47.2
7.27.1
7.17.1
7.07.1
7.27.3
7.57.5
7.5
18340
7.27.4
7.57.4
7.47.4
7.37.2
7.27.1
7.17.1
7.17.2
7.37.3
7.3
19360
7.27.3
7.47.4
7.57.4
7.37.2
7.37.2
7.17.2
7.17.2
7.27.1
7.1
20380
7.37.3
7.37.4
7.47.4
7.37.3
7.27.3
7.27.1
7.17.2
7.17.0
7.1
21400
7.37.3
7.37.3
7.37.2
7.27.2
7.27.2
7.17.2
7.27.2
7.17.0
7.0
22420
7.47.3
7.37.1
7.06.9
6.97.0
7.07.1
7.07.0
7.07.0
7.17.0
7.0
23440
7.57.4
7.26.8
6.76.5
6.56.5
6.86.8
6.66.5
6.36.1
6.76.9
7.0
24460
7.37.3
7.06.6
6.36.1
5.95.8
5.96.1
6.06.2
6.36.1
6.26.7
7.0
25480
7.27.1
6.86.6
6.25.8
5.65.4
5.65.6
5.86.1
6.46.4
6.46.7
7.0
26500
7.17.0
6.86.5
6.15.6
5.14.9
4.95.1
5.76.1
6.36.5
6.66.8
7.0
27520
7.16.9
6.76.4
6.05.5
5.25.1
5.15.1
5.86.1
6.46.5
6.76.8
7.0
28540
7.16.9
6.86.4
6.15.7
5.55.3
5.25.4
6.06.2
6.46.5
6.66.7
6.8
29560
7.37.1
6.86.4
6.25.9
5.75.6
5.65.7
6.16.3
6.46.5
6.66.7
6.7
30580
7.27.0
6.86.6
6.46.1
5.95.9
5.85.8
6.16.4
6.46.6
6.76.7
6.7
31600
6.96.8
6.86.6
6.56.3
6.16.0
6.05.9
6.26.3
6.46.5
6.76.9
6.7
32620
6.66.8
6.86.7
6.66.4
6.26.0
6.06.0
6.26.3
6.56.7
6.96.8
6.8
33640
6.47.0
6.96.7
6.46.2
6.16.1
6.16.2
6.46.7
6.87.0
6.86.9
34660
6.37.0
6.86.7
6.46.3
6.36.3
6.16.0
6.46.4
6.56.8
6.77.0
35680
6.46.8
6.66.5
6.46.5
6.56.4
6.46.6
6.56.5
6.76.8
6.77.2
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
7.37.3
7.37.3
7.37.2
7.27.2
7.27.2
7.17.2
7.27.2
7.17.0
7.0
7.47.3
7.37.1
7.06.9
6.97.0
7.07.1
7.07.0
7.07.0
7.17.0
7.0
7.57.4
7.26.8
6.76.5
6.56.5
6.86.8
6.66.5
6.36.1
6.76.9
7.0
7.37.3
7.06.6
6.36.1
5.95.8
5.96.1
6.06.2
6.36.1
6.26.7
7.0
7.27.1
6.86.6
6.25.8
5.65.4
5.65.6
5.86.1
6.46.4
6.46.7
7.0
7.17.0
6.86.5
6.15.6
5.14.9
4.95.1
5.76.1
6.36.5
6.66.8
7.0
7.16.9
6.76.4
6.05.5
5.25.1
5.15.1
5.86.1
6.46.5
6.76.8
7.0
7.16.9
6.86.4
6.15.7
5.55.3
5.25.4
6.06.2
6.46.5
6.66.7
6.8
7.37.1
6.86.4
6.25.9
5.75.6
5.65.7
6.16.3
6.46.5
6.66.7
6.7
7.27.0
6.86.6
6.46.1
5.95.9
5.85.8
6.16.4
6.46.6
6.76.7
6.7
6.96.8
6.86.6
6.56.3
6.16.0
6.05.9
6.26.3
6.46.5
6.76.9
6.7
6.66.8
6.86.7
6.66.4
6.26.0
6.06.0
6.26.3
6.56.7
6.96.8
6.8
6.47.0
6.96.7
6.46.2
6.16.1
6.16.2
6.46.7
6.87.0
6.86.9
6.37.0
6.86.7
6.46.3
6.36.3
6.16.0
6.46.4
6.56.8
6.77.0
6.46.8
6.66.5
6.46.5
6.56.4
6.46.6
6.56.5
6.76.8
6.77.2
Example 7 - PEC Results
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 8
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 8
Section 4-36
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 8 - RAD & PEC of Elbow
Different Schedule
Different Schedule
Weld Area
Weld Area
Detected Defect
ICORR Symposium on Atmospheric Corrosion in Industrial Applications April 2018 Warrington
Example 9