A tie rod support apparatus for a large pressure vessel system. The tie rod support apparatus comprises a tie bar, an upper bearing unit, a bottom bearing unit and a tie rod support base. The upper bearing unit is coupled to a pipe section or other component in the large pressure vessel system and includes a bearing to provide a pivotally moveable connection point. The bottom bearing unit is coupled to the other end of the tie rod and configured with the tie rod support base. The tie rod support base is connected or attached to a support surface (e.g. a concrete slab or block) that is independent from the large pressure vessel system. The bottom bearing unit may include a bearing to provide another pivotally moveable connection point. According to an embodiment, the tie rod support includes a length adjustment mechanism configured to allow adjustment of the length or span of the tie bar. According to an embodiment, the tie rod support includes a spring block configured to allow flexing of the tie rod support assembly.