The tension in the compensator assembly broke the connection between the piston rod and the compensator piston (screwed connection). The piston rod together with the tri-pod fell down and hit the side of the spider elevator. On impact the safety split pin from the hinge pin sheared. This resulted in a disconnection of the shackle and piston rod. The piston rod and the shackle weighing 3 kg. fell down on the rig floor from a height of about 13 m.