System, method and device for fluid conduit inspection

A computer system for inspecting a fluid conduit using passive magnetometry, the computer system comprising:

• a memory for storing:
• first magnetic flux data and second magnetic flux data collected by a sensor device from inside the fluid conduit without applying an external magnetic field to the fluid conduit, the first and second magnetic flux data representing a residual magnetization of the fluid conduit, the first and second magnetic flux data including a plurality of magnetic flux values recorded at predetermined intervals along a first length of the fluid conduit and a second length of the fluid conduit, respectively, during a first measurement run by the sensor device, wherein the first and second lengths of the fluid conduit are non-overlapping segments of the fluid conduit;
• and
• reference data comprising (i) historical sensor data collected from one or more other fluid conduits or (ii) one or more thresholds generated from the historical sensor data;
• and
• a processor in communication with the memory and configured to:
• determine a first statistical spread of the first magnetic flux data and a second statistical spread of the second magnetic flux data using the first and second magnetic flux data, wherein the first and second statistical spreads differ;
• identify a conduit condition of the first length of the fluid conduit by:
• comparing the first statistical spread of the first magnetic flux data to the second statistical spread of the second magnetic flux data to determine the fluid conduit condition of the first length of the fluid conduit in comparison to the second length of the fluid conduit;
• and
• comparing the first statistical spread of the first magnetic flux data to the reference data;
• and
• generate an electronic representation of the conduit condition of the first length of the fluid conduit, wherein the electronic representation is stored in the memory.