An Innovative Upgrade And Performance Rerate Of Large, High Speed, High Temperature, Multistage Barrel Pumps
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High pressure hydrocracker charge is one of the most arduous services for multistage centrifugal pumps in the refining industry. Future plant capacity requirements of the hydrocracker unit at a United Kingdom site required a 25 percent increase in capacity and a three to 10 percent increase in differential pressure of the charge pump duty. After preliminary investigations, the decision was made to rerate and upgrade the existing pumps, as opposed to purchasing new equipment. In addition to the performance rerate, there was a requirement to resolve a long term vibration problem and to improve the performance of the mechanical seals. The final scope of work included major modifications to the pumps including one new barrel casing, cartridge-type double mechanical seals, new gearboxes, and new motors. In addition, extensive modifications of the baseplates were required, which included new support pedestals for both pumps and motors. Refurbishment of the lube oil systems and modification to the seal oil systems were also carried out. Of major significance is that complete refurbishment and recommissioning of two out of the three pump sets was carried out with the plant in operation.
Verhoeven, Jan J.; Redpath, David; Kerr, Angus F. (1998). An Innovative Upgrade And Performance Rerate Of Large, High Speed, High Temperature, Multistage Barrel Pumps. Texas A&M University. Turbomachinery Laboratories. Available electronically from