How to Determine the Tightening and Wear Resistance of the 'V' Notched Type Integrated Protection Turbine Wing and Shield Plate

摘要

Notches are placed between adjacent shroud portions of integrally shrouded rotating blades of a steam turbine forming a turbine rotor blade row generally 90 apart and a predetermined wedging force is applied to each notch to wedge adjacent shroud segments apart, the width of the gap formed is measured, recorded and compared with future measurements made after the turbine has been in service to determine wear on the shroud portions; also, a wedging force is applied to open a gap at each notch to receive a predetermined sized shim, the wedging force is relieved clamping the shim in the gap and then generally increased until the shim can be pulled from the gap by hand, the wedging force at which the shim can be pulled is recorded and compared with future similar recordings after the rotor has been in service to provide an indication of wear on the shroud portions.