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MAGNETIC TOMOGRAPHY METHOD(MTM)
Non-Contact Pipeline Inspection
100.00
90.00
80.00
70.00
60.00
50.00
40.00
Surface Pipelines, Underground Pipelines, Submarine Pipelines,
MTM Basics
MTM is based on Villari Effect (magneto-elasticity, of inverse magnetostriction).
When subject to mechanical deformation(or stress), metal changes its magnetization.
The basis of MTM integrity concept is the fact that it is not defects themselves
that are dangerous for metal and constructions, but local combination of defects
and high stress is. MTM is capable of remote detection of stress concentration
spots within the pipe metal by analyzing its magnetic field.
It detects areas subject to stress concentrators (defects and locally applies forces)
and determines the level of risk of these areas.
MTM Advantages
.
NO BLINDSPOTS: entire pipeline length.
NO INTERRUPTIONS: Inspectionunder pipelineoperatingcondition
NO SPECIAL PIPELINE PREPARATION
SPEED OF SCANNING: up to 5 km/hour.
APPLICABLE: all types of magnetized metal pipelines.
DETECTS : all types of anomalies inside and outside of the pipe.
INTEGRITY EVALUATION: evaluate the pipeline for all types of
defects and stress concentrations under actual operating conditions.
INDICATES STRESS CONCENTRATION: "insignificantly small"
defect that cannot be detected by other non-destructive testing methods
which may in turn be high-risk anomalies.
PRECISION OF MTM EVALUATIONS: 90% to 97% correspondence
with conventional methods of CHl/ln, DNV, ASME, API FEM, Etc.
NOT NECESSARY: contacts with pipeline surface.
NO CLEANING OR PREPARATION: internal and external
EFFICIENTFOR MICRO CRACK IN WELDS: at high-load areas in
new pipelines.
MTM Reliability
Probability of detection of defective areas: 90%
Probability of correct interpretation of danger degree: 77.5%
Probability of missing a critical defect: 2.25%
Probability of false calls POFC: 0% to 17%*
* the largest value is for the pipeline which is laid in environment including
large amount of metal debris.
MTM Procedure
1. Determining the pipeline location underground.
2. Scan the pipeline using a portable magnetometer that automatically
records magnetic data and GPS coordinates.
3. Select the 1 or 2 locations for excavation showing anomality in the survey.
4. Additional non-destructive testing is performed by excavation after Step
3 if required.
5. Submit the final report, that includes:
• The locations and risk levels (anomalous) of the pipeline
• Parameters for analyzing safety of all detected defect areas
Safe operation term (Tsafe)
Safe operation pressure (Psafe)
Estimated repair factor (ERF)
Local internal stress values (Si)
.
AQUA MTM
Technology developed by RDC Transkor-K in Russia in frame of a joint development
agreement with PETRONAS in Malaysia.
AQUA MTM can be used to inspect subsea pipelines along their entire span at
depths up to 200 m with POD > 80%.
AQUA MTM is designed for remote evaluationof
stress-deformed state ofsubsea pipelines of any
purpose intended to be usedwith an underwater
remotely operated vehicles(ROV).
Retaining all advantages of the onshore
MTM, the Aqua MTM is capable of remote
inspection, without interruption of operation,
safely, not incurring risks to personnel, or
damage to property or to the environment, in
order to detect integrity parameters of
submarine pipelines by detecting metal
defects (metal loss due to internal or external
corrosion, change of geometry, etc.), and
stress concentration areas (free spans, loss of
stability, etc).
AQUA MTM
MTM Animality Log Report
Density of Anomaly Distribution
Comparison of Various Inspection Methods
MTM Requirements and Limitations
• Maximal inspection distance
between the pipeline and magnetometer: ……… 15x of pipe diameter
• Minimum diameter of a pipeline: ……………..… 80 mm
• Minimum length of a pipeline to be inspected: …..100 m
• Minimum clear path for inspection work: …..… 1 m
Inspection Geography
Russia
China
Germany
Canada
Great Britain
USA
Australia
France
Italy
Argentina
Brazil
Malaysia
Armenia
Croatia
Ukraine
Columbia
Sudan
Indonesia
Uzbekistan
Azerbaijan
Certificates and Patents
Since 2002 TRANSKOR has inspected over 17,000 km of underground pipelinesand over
500 km of offshore Pipelines.
IEV (Thailand) Co., Ltd.
99/48 Moo 3, Prakasamai Subdistric, Muang Samutprakarn, Samutprakarn 10280
09 2449 8881
FAX 02 115-7139
[email protected] www.ievthaialnd.com
