vLocDM2 Defect Mapper

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vLocDM2 Defect Mapper

Vivax-Metrotech‘s vLocDM2 pipeline defect mapper allows the user to collect current attenuation data and GPS data, and display that information on screen in a live graphical plot of the results.  It locates pipeline, coating defects, and structural shorts using the latest locating and signal processing techniques to plot the current gradient of an industry standard low frequency (3Hz or 4Hz) profiling current. The current is typically applied at CP stations so the disruption of the pipeline can be minimized.

The vLocDM2 receiver takes measurements along the pipeline and plots the results directly onto the screen of the receiver.  All data is available and displayed without the use of extra logging or display devices.  Once plotted, the receiver is able to download the collected data into a spreadsheet or dedicated analysis program.

The GPS antenna is accurate to plus or minus 3 meters and is linked to the receiver via a Bluetooth radio link.  The GPS enables the user to generate a real-time current gradient graph and guides the user back to the point of interest by highlighting the user’s position on the graph.  The vLocDM2 pipeline current mapper system can also be integrated with other high-accuracy GPS systems and software packages.

The Loc-150Tx is a 150 watt transmitter (vLocDM2 transmitter) that is used to apply signal current to the anode bed.  The pipeline returns the signal via coating faults back to the transmitter.  The transmitter is designed to be powered from CP (Cathodic Protection) stations, AC or external batteries, which eliminates the need for batteries.

Designed to:

  • identify the position of coating defects
  • identify shorts to other structures
  • help categorize the faults
  • help plan and prioritize remedial work
  • operate as a long-line pipeline locator


  • Real-time on-screen mapping
  • Integrated GPS and Bluetooth
  • Low-frequency 3Hz and 4Hz current mapping
  • “Walk-back” feature guides user to point of interest