A client requested replacement of the main oil line getter pump with re-designing of a shaft, impellers, diffusers, a ring section, a balance drum, and a restriction bush. The impellers and diffusers were customized for operation at the required lower flow (65%).
Concerning the erosion, the recommendation is to coat it with a special erosion/temperature resistant coating to prevent further erosion advancing (statistically, once erosion initiates and gets visible during 2nd overhaul, by the time of 3rd overhaul the amount of accumulated erosion damage leads to a catastrophic failure and renders equipment completely non-recoverable) and to significantly extend the motor life.
To perform a deviation check, we decided to compare the old and the new parts using 3D models of power turbine ring pads, bearing pads, and thrust pads. We used ROMER ABSOLUTE ARM for 3D scanning. First, we cleaned and fixed the parts to digitalize them. Then, we processed the results obtained in a form of point cloud data, to make solid 3D models. We aligned them along the major axes to finally compare and find the deviations between the old and the new parts.