Vortex Pumps

A typical vortex pump is shown in Figure 66.* The ability of this type of pump to handle relatively large amounts of suspended solids as well as entrained air or gas more than offsets the relatively low efficiency. Table 10 lists performance data for four typical vortex pumps and four radial-flow centrifugal pumps of nearly the same head and flow rate. Figure 67 shows the head characteristics of a typical vortex pump with impellers of different diameters together with curves of constant efficiency and constant NPSH. Power curves for the same impellers are shown in Figure 68.

Curves for a conventional radial-flow pump have been added for comparison in Figures 67 and 68. Note that the head of the vortex pump does not decrease as rapidly with an increasing flow rate as does the head of the conventional pump. The power requirement of the vortex pump increases almost linearly with an increasing flow rate, whereas the power required by a conventional pump of about the same specific speed reaches a maximum and then decreases with the increasing flow rate.

Thus if the motor of the vortex pump has been selected to match the power required at the normal flow rate for best efficiency, it will be overloaded if the pump operates much beyond that point.

FIGURE 66 Vortex pump (courtesy Fybroc Division, METPRO)

*See also Section 9.2.

TABLE 10 Characteristics of typical vortex pumps and comparable radial-flow centrifugal pumps at 1750 rpm
Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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