GLOBAL MTM for Offshore Facilities

The GLOBAL MTM technology has been further developed to emcompass submerged pipelines.

Figure1. Principle of operation of the device - it measures magnetic field distortion in the presence of metal defects.

Figure2. Underwater pipeline testing device is being prepared for submerging.

The device features magnetic field detectors, several remotely operated video cameras, light sources, and propelling devices.

Figure3. Magnetic field sensors (1), remotely controlled cameras (2), propelling devices (3), and light source (4) are parts of the unit necessary for successful operation.

It is launched from the mother ship but performs maneuvers using its own propelling devices.

Figure4. Mother ship with submerged unit on the route.

The unit is controlled by operator from inside of the mother ship.

Figure5. GLOBAL MTM for underwater operator workplace during pilot testing.

Operator navigates the device and checks for the objects that might prevent GLOBAL MTM for underwater to gather the data.

Figure5. GLOBAL MTM for underwater Operator Console during the testing process.

GLOBAL MTM Guarantees

GLOBAL MTM Guarantees high Probability Of anomaly Detection (POD) level. GLOBAL MTM Technology reliably reveals anomalies related to metal defects of any type within interval of local mechanical stresses in anomaly zones of 0,30÷0,85 Specified Minimum Yield Strength (SMYS) with reliability POD = 80 % for 97% of the pipeline length.

Declared value of POD for GLOBAL MTM is not less than 80% at mechanical stresses in defective areas (or features of the object) within the range of 30-85% SMYS.

GLOBAL MTM General Limitations

The GLOBAL MTM Technology has limited or no application if one or more of the following conditions are true:

- High level of residual magnetization of pipelines;
- Stresses in the area of anomaly exceeding yield strength;
- Presence of magnetic masses between magnetic field sensors and a pipeline.