As part of subsea cable design project, AMOG was contracted to perform physical anchor model testing for a US Navy Stockless anchor for three specific soil configurations. AMOG was able to provide this service by excavating a pit for testing and utilising photogrammetry software to track an anchor as it was pulled through the substrate.

In general terms, the procedure was:

  • Design, prepare and level Substrate
  • Ensure anchor was correctly placed at the starting location (near the end of the test pit)
  • Lay out chain over substrate and connect to specifically designed A-frame attached to a winch
  • Flood pit
  • Drag anchor at slow steady speed, allowing the trajectory to be recorded

AMOG was able to determine the maximum burial of the anchor fluke tip utilising quality assured methods and calibration markers both around the drag pit and on markers rigidly attached to the anchor. The anchor markers enabled the photogrammetry process to locate the anchor with respect to the fixed markers. This telemetry data was then used in a transformation to locate the anchor's fluke tip at each data point. A high degree of accuracy may be achieved within 5 millimetres for a target 10-20m down range using AMOG’s technique and software.

AMOG performed all testing in accordance with the requirements of established Health, Safety, Environment and Quality (HSEQ) plans.