MTM
Magnetic Tomography Method inspection
A non-intrusive, non-contact method for inspecting ferrous pipelines. MTM covers 100% of the pipeline and has been proven in industry use since 2001.
MTM-GMagnetic Gradient Tomography Method
The new generation of MTM. A non-destructive testing solution for anomaly detection and pipeline integrity evaluation, for above-ground, underground and offshore pipelines of all types and sizes.
- 90–97%
- Agreement with conventional NDT
- Up to 1,500 m
- Subsea inspection depth
- Over 80%
- Offshore probability of detection
- 50 mm
- Minimum pipe diameter
Overview
MTM-G is based on the Villari effect: the change in magnetisation of a ferromagnetic metal when it is subjected to mechanical deformation or stress. A portable magnetometer scans the pipeline and measures its magnetic field, and changes in that field are used to identify anomalies and stress concentrations in the pipe.
Advantages of MTM-G
No blind spots
Inspects the entire length of a pipeline, including bends and turns.
No interruptions
Pipelines stay in operation during inspection.
No special preparation
No cleaning or depressurisation of the pipeline is needed.
Detects all types of anomalies
Finds anomalies inside and outside the pipe, including metal loss, corrosion and cracks.
Identifies stress concentrations
Locates areas of stress concentration, where failure is most likely.
Accurate and reliable
Shows 90–97% agreement with conventional NDT methods.
Subsea MTM-G
Subsea MTM-G is a variant designed for underwater pipelines. It inspects pipelines up to 1,500 metres deep and detects metal anomalies such as metal loss, corrosion and cracks.
Combining the MTM-G anomaly map with a seismic activity map adds further analysis and integrity assessment capability.
Subsea MTM-G inspects offshore pipelines along their entire span with a probability of detection above 80%.
Scanning and calibration
We locate the pipeline axis below the ground surface.
We scan the pipeline with a portable magnetometer that records magnetic data and GPS tracks automatically.
We process the data and review it for quality.
If data quality is not acceptable, we rescan the pipeline.
We deliver a final report listing the dangerous (anomalous) areas of the pipeline, located on the map with their danger degree.
Requirements and limitations
- Distance from pipe axis to magnetometer
- 25D to 30D maximum
- Operating pressure
- No minimum or maximum
- Pipe diameter
- 50 mm minimum, no maximum
- Wall thickness
- 2.8 mm minimum, no maximum
- Section length
- No limit
- Access
- A clear path at least 1 m wide for the operator to walk above the pipeline
Technology partner
MTM-G is developed by IGSAT. El-Eman delivers MTM-G inspection to pipeline operators in Egypt.
Technical documents
Get a quote for MTM-G
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