Whenever heavy-duty pumping is involved, produced-water injection (PWI) pumps are among those that come to mind first. Except for large piston pumps occasionally used for PWI duties, multi-stage centrifugal pumps are now primarily used in this severe service. Two typical styles of multi-stage centrifugal pumps—barrel and horizontally split—are shown in Figs. 1 and 2. PWI pumps are offered by different manufacturers, and this article will make no attempt to describe them all. Instead, the author will provide insight into sealing options for major pumps.
Fig. 1. Barrel-style multi-stage PWI pump. Source: Sulzer CPH barrel pump.
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