For the hydrocarbon processing industry (HPI) to routinely rebuild an “older” or “vintage” centrifugal pump to original equipment manufacturer (OEM) specifications is not practical, given present pump rebuilding and testing technology. Pump users realize that changes to system performance do occur over time, and technology advances make efficiency gains possible. A highly qualified independent rebuild shop with up-to-date design tools and experienced personnel can verifiably offer high-quality upgrades that improve both uptime and efficiency consistent with current system performance requirements. Considerable consolidation has taken place within the pump industry; thus, the distinct possibility exists that a particular OEMis no longer able to offer the same engineering competence they had provided decades ago. In addition, some equipment vendors have “downsized” or “right-sized” their traditional inspection departments into oblivion. The user-owner often sees the consequences reflected in unexpected pump downtime and repeat failures. Fig. 1 shows how consolidation has taken place.