)
)
ILI based verification process for existing pipe books.
)
)
Proven results, based on API 1163 pull tests, successful ILI runs
and confirming field verifications.
)
)
High quality service with certified processes (API 1163),
personnel qualification (ASNT) and equipment (CE, ATEX).
Verification and validation
Performance tests were executed at the ROSEN R&D Centre in
Lingen, Germany. The new technology, onboard a 16 in. tool, for
the RoMat services were pulled through segments of pipe with
different steel grades.
The pull-test results were compared with tensile testing
results obtained from cut-out samples. The comparison confirmed
a high accuracy.
Figure 4 shows an overview of the processed pull-test
data. The test segment consisted of joints with different wall
thicknesses. Figure 4c shows the obtained measurements as
a C-Scan: colour coded amplitude per measuring point over
distance and circumference.
In-field validation results
The first ILI tool run was performed in a 16 in. natural gas pipeline
to record data and measurements for the RoMat service. In a
second step, the in-field verifications were performed for two
locations after the ILI survey in January 2014. Figure 5 shows the
results of the ILI survey. The yield strength is presented in relation
Figure 4a.
Schematic view of the pull-test segment consisting
of eight test joints (plus inlet and outlet) of varying length and
varying wall thickness (not to scale).
Figure 4b.
Colour scan of the pipe grade measurement. The
different steel grades are clearly visible.
Figure 4d.
ILI inspection tool for RoMat services
Figure 4c.
Median in circumferential direction of pipe grade
measurement plotted along axial direction.
Figure 6.
IMP including the use of the RoMat service for
pipeline systems with incomplete and/or uncertain records.
Figure 5.
Results of ILI run showing the detected grade for
each joint.
48
World Pipelines
/
JANUARY 2015
