A multistage centrifugal pump is designed with two or more impellers. Depending on the brand and configuration, the impellers might be mounted on the same or different shafts. If high pressures at the outlet are required, impellers can also be connected in series whereas for high flow output, they are typically connected parallel.
Using a multistage centrifugal pump to develop high pressures on a common shaft within the same casing is more economical than a pump with just one impeller. As part of the pump design, channels within the pump casing work by routing the discharge of one impeller to the suction of another.
Water enters the pump and then passes through the multiple impellers in a series, going from the left to right. From there, water passes from the volute that surrounds the volute of one impeller to the suction of the next impeller. Most pumps of this kind are single-stage there are many times when a multistage centrifugal pump is the better solution.
Choosing a Top Brand
Although there are different brands available, one of the best multistage centrifugal pumps is manufactured by Travaini. However, there are also companies like Premier Fluid Systems that market this and other brands so you have different options for purchase. As mentioned, there is a series of impellers for this particular brand used so the head increases as pumped liquid transfers from each impeller.
On this specific multistage centrifugal pump the axial thrust forces are balanced with what are known as balancing blades located on the back of the impellers. Remaining forces are then absorbed by an angular ball bearing at the drive end and a heavy-duty ball bearing at the non-drive end.
With a Travaini multistage centrifugal pump with two external bearings, provided is a seal pressure balancing line that relieves pressures from the seal area at the discharge side going back to the pump’s suction side. Having this unique design feature makes it possible for more economical seals to be used, even when the pump is operating at high pressures.
Multistage centrifugal pumps are sold in different sizes, again based on budget but also application and volume. For heating plants, water supply piping, fire-fighting operations, irrigation, agriculture, autoclaves, boiler feed, hydrocarbons, and the handling of slightly dirty but also clean liquids, a smaller pump would suffice.