Positive Material Identification Process

Report
TDW Positive Material Identification
Kenny Greene
August 20, 2013
www.tdwilliamson.com
® Registered trademarks of T.D. Williamson, Inc. in the United States and in foreign countries. © Copyright 2010
Positive Material Identification Process
This Non-Destructive Evaluation (NDE) process consists of the following:
 Ultrasonic Thickness Testing (UTT)
 AUT B-scanner (C-Scan display)
 Automated Ball Indention (ABI)
 Optical Emissions Spectrometry (OES)
 Magnetic Particle Testing (MT)
These five NDE methods make up the PMI process. During this process we use UTT to
verify Actual Wall Thickness (AWT). We then perform an ultrasonic C-scan to ensure
that the data collection locations on the material are free from internal anomalies.
Next, we prep the pipe surface and perform the ABI to determine Yield Strength. Then
we perform the OES testing to determine Chemical Analysis & Carbon Equivalence.
Finally, we perform MT to ensure that there were no adverse effects to the material
from our proceeding tests and to be certain that it was actually a “Non-Destructive
Evaluation”. All of this Positive Material Identification process is performed on-site, inservice & non-destructively in approximately 4 hours.
2
Automated Ball Indention (ABI)
3
Positive Material Identification
 ABI uses
sophisticated
algorithm to
determine
material yield
strength based on
a stress strain
curve generated
by the equipment
software.
4
Positive Material Identification
 A Ball Indenter
sequentially
applies a load
fifteen times at
a single
location.
5
Positive Material Identification
 The ABI ball indenter automatically adjusts and measures the
load necessary to achieve a predetermined depth throughout the
fifteen sequential load/depth measurement processes.
 Once the fifteenth and final load is applied at the individual
location and the final maximum depth of 6 mils is achieved, the
stress/strain data is analyzed to determine the UYS of that data
point.
6
Positive Material Identification
 After each
indention the
depth and load
values are
recorded.
 A typical
“Stress vs.
Strain curve” is
calculated
7
ABI Data Sheet
8
Optical Emission Spectrometry
 OES determines elements present and their
concentrations as well as the Carbon Equivalency
value for welding purposes.
 OES uses an Argon flush and then creates a plasma.
 The photons that are given off by each of the elements
in the plasma have unique wavelengths and these
wavelengths are then measured.
 From this, the concentration of each element present
is calculated.
9
OES Data Sheet
Run 3
10
OES Burn
11
Arc-Met 8000
12
PMI Data Sheet
13
Thank you!
Questions please contact:
Chris Caraway
NDE Operations Manager
[email protected]
[email protected]
14

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