Method of detecting a position of at least one bolt end of at least one bolt

A method of detecting a position of at least one bolt end of at least one bolt of a series of bolts arranged in a linear or curved flanged connection wherein the bolt ends of the bolts arranged in the flanged connection are protruding beyond the flanged connection, with a camera which is movable along the flanged connection,

• characterized in that, the method comprises the steps of:
• defining a first bolt end level at a first distance from the flanged connection;
• defining a first tolerance range surrounding the first bolt end level;
• detecting the position of the bolt end of the at least one bolt arranged in the flanged connection with the camera;
• determining whether the position of the bolt end of the at least one bolt is located within the first tolerance range surrounding the first bolt end level;
• elongating at least one bolt of the flanged connection by applying a force on the bolt in an axial direction of the bolt;
• tightening a lock nut threaded onto the bolt while applying the force on the bolt;
• releasing the force on the bolt;
• defining a second bolt end level at a second distance from the flanged connection, wherein the second distance is greater than the first distance;
• defining a second tolerance range surrounding the second bolt end level;
• after elongating the bolt tightening the lock nut and releasing the force on bolt detecting the position of the bolt end of the bolt with the camera;
• determining whether the position of the bolt end is located within the second tolerance range surrounding the second bolt end level.