Patent ID: 7665218

Claim:
An apparatus for measuring an azimuth of a tube having a bore axis, comprising: a centering mandrel having a longitudinal axis; a flexible member for defining a bore axis projection of the bore axis; a tensioner fixed to one end of the flexible member, the tensioner including a support point for the flexible member, the support point lying on a longitudinal axis of the centering mandrel; a support structure comprising bottom and top plates connected with support members, the tensioner being fixed to the top plate, the centering mandrel being fixed to the bottom plate; another end of the flexible member being fixed to the bottom plate at a point where the longitudinal axis of the centering mandrel intersects the bottom plate; and a pair of adjusters connected to the tensioner, the adjusters for moving the tensioner along a respective pair of axes that are perpendicular to the bore axis projection, the respective pair of axes of the adjusters being mutually perpendicular.