December 2012

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HP Reliability: Upgrade the design of vertical, multistage centrifugal pumps in low-temperature services

The overall mechanical design of most API-style vertical-column pumps (Fig. 1) comes close to meeting the expectations of modern pump users. Such pumps are often equipped with self oil-lubricated bear..

Bloch, H. P., Hydrocarbon Processing Staff

The overall mechanical design of most API-style vertical-column pumps (Fig. 1) comes close to meeting the expectations of modern pump users. Such pumps are often equipped with self oil-lubricated bearing thrust assemblies in contrast to older designs that depended on motor-thrust bearings only. Some older vertical pumps deserve to be closely reviewed. Based on failure history and criticality of service, older vertical-column pumps are candidates for upgrading at the next routine repair or maintenance opportunity. The adequacy for large vertical pumps should include these 10 factors:   Fig. 1. Typical vertical-  pump inlet bowl and   mixed-flow impeller. The

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