1. SCOPE This procedure indicates the standard practice for the high speed multi-plane methods for balancing Ge Oil & Gas Nuovo Pignone steam turbine rotors. All the detailed steps of the balancing are specified with the corresponding acceptance criteria. The acceptance criteria are applicable when operating with “Schenck” high speed balancing machine equipped with flexible supports type DH (“locked” and “unlocked”). It’s not allowed to perform balancing with other equipment.