Caliper pig for detecting geometrical deformation of a pipeline

A caliper pig for detecting geometrical deformation of a pipeline, the caliper pig comprising:

• a body;
• a first sensor arm assembly comprising:
• a primary caliper sensor ring adapted to be mounted on the body;
• a plurality of sensor arms adapted to be mounted and circumferentially distributed on the primary caliper sensor ring, wherein each of the plurality of sensor arm comprising:
• a sensing arm adapted to be in contact with an internal surface of the pipeline, wherein the sensing arm is adapted to resiliently move based on contour of the internal surface of the pipeline;
• a magnet coaxially disposed in the sensing arm and adapted to rotate along the sensing arm;
• and
• a sensing unit configured to:
• detect a change in magnetic field associated with the magnet based on the movement of the sensing arm;
• and
• generate an output indicative of an angle of deflection of the sensing arm while traversing on the internal surface of the pipeline;
• and
• a second sensor arm assembly comprising:
• a secondary sensor ring adapted to be mounted on the body of the caliper pig;
• a plurality of secondary sensor arms adapted to be mounted and circumferentially distributed on the secondary sensor ring, wherein each of the secondary sensor arms comprising:
• a base member;
• a pair of top levers pivotally coupled to the base member;
• a pair of bottom levers disposed below the pair of top levers and pivotally coupled to the base member;
• a sensing module coupled to the pair of top levers and the pair of bottom levers;
• and
• a wear plate coupled to the sensing module and adapted to be in contact with the inner surface of the pipeline.