Client: Trustpower Ltd
Location: Cobb Powerstation
Scope of Work: Turbine to Generator Alignment
Date: July 2016

After a pelton runner was replaced, AEG was asked to measure and correct the alignment between turbine and generator. There were a number of challenging factors on the project including tight timeframes, working with fixed elements and the requirement to account for shaft deflections due to water jet force.

Alignment measurement and correction was undertaken using a Pruftechnik ROTALIGN Ultra laser instrument system. An optical theodolite was also used for axial position and reference level checks.

The AEG engineer successfully realigned the turbine to within tolerance. Soft-foot on the turbine bearing housing was also measured and corrected.