Expander of tubular assembly

An expander for expanding a tubular assembly having a tubular covering element inserted inside a tubular element to be covered, the expander comprising:

• a tip shaped to push a first internal wall of the tubular covering element toward a second internal wall of the tubular element to be covered so as to enable adhesion of a first external wall of the tubular covering element to the second internal wall of the tubular element to be covered;
• a rotary joint slidable along a longitudinal first axis of the tubular assembly, the tip being coupled to the rotary joint so as to arrange the tip radially with respect to the first axis and to enable the tip to rotate around the first axis;
• a motor coupled to the rotary joint and causing the rotary joint to slide along the first axis and to rotate;
• a sensor operatively connected to the tip at least to detect a radial displacement of the tip following a current thrust exerted by the tip;
• and
• a logic control unit operatively connected to the sensor and to the tip for adjusting a future thrust exerted by the tip according to the radial displacement.