Flatness Survey and Correction of Turbine-Generator Alignment Using Laser Measurement Techniques

Abstract

Turbine-Generator sets must be flat and correctly aligned to function reliably. The units are aligned when the plant is constructed, but they do not always stay that way. The plinth and foundation that supports the turbine and generator can twist and sag over time. This deformation can result in distortion of turbine casings and misalignment of the units. Many plant operators are not aware that this can and does happen. These conditions can result in a number of (often costly) flow-on effects. We aim to demonstrate in this paper that laser measurement has proven to be an integral part of the diagnosis and solution of these conditions. Turbine owners and operators stand to benefit from solving these issues through reducing unplanned downtime and costly repairs, and increasing performance.