Single-Stage or Two-Stage Centrifugal Pumps

CURRENT INCREASE in use of single-stage centrifugal fire pumps poses a question to prospective fire apparatus purchasers. “Shall we specify a single-stage or a two-stage seriesparallel pump?” There may be a good deal of discussion, among the operators and those responsible for writing specifications, about the merits of the two designs. Someone is sure to say, “our first pumper, bought 35 years ago, had a single-stage centrifugal pump. Now we have seriesparallel or “pressure-volume” centrifugals. If we buy a single-stage pump, are we going backwards?”

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