Useful articles in the field of in-line diagnostics

How DGPS helps in in-line inspection?

2024-10-19 08:36

✅ 1. Precise Location of Inspection Launch and Receiver Sites

DGPS allows operators to accurately determine and document the geographic coordinates of the pig launcher and receiver stations.
This ensures a precise start and end point for the ILI tool’s journey.

✅ 2. XYZ Mapping of the Pipeline

During ILI runs, tools equipped with inertial navigation systems (INS) measure the 3D position, orientation, and movement inside the pipe.
DGPS data is used to calibrate and correct the INS data by:
Providing reference ground truth coordinates at known locations (e.g., marker stations).
Reducing drift in INS measurements over long distances.

🔍 Result: A highly accurate XYZ mapping of the pipeline route, including:

✅ 3. Correlating Defects to GPS Coordinates

DGPS enhances the spatial accuracy of detected anomalies (e.g., corrosion, dents, cracks).
This makes it easier to:
Pinpoint the exact location of defects above ground.
Plan targeted excavation or repair activities.
Avoid unnecessary digging or mislocating defects.

✅ 4. Pipeline Strain and Movement Monitoring

In areas prone to land movement (e.g., landslides, earthquakes, subsidence), DGPS and ILI data together can detect:
Pipeline strain
Shifts or deformation
This helps in proactive risk management and integrity evaluation.

✅ 5. Integration with GIS and Integrity Management Systems

DGPS-based location data is used to integrate ILI results into GIS platforms.
This supports:
Lifecycle management
Asset integrity tracking
Regulatory compliance (e.g., PHMSA, NACE standards)