Multistage Chemical Pumps 101

Posted: 2/12/2019

What is a multistage pump?

Multistage pumps are centrifugal pumps in which the fluid flows through several impellers fitted in series. This is as opposed to a single stage pump which only has one impeller. The more stages the pump has, the higher the final discharge pressure.

Multistage chemical pumps are unique in that they are able to produce increasingly higher pressures with the addition of every stage while the flow range always remains constant for a given rpm.

Key differences between multistage pump vs. single stage

As opposed to the mechanics of the multistage pumps, single-stage pumps only have one pump impeller. The amount of pressure generated by the impeller/volute combination depends on the diameter of the impeller and the speed at which the impeller is turning. For a single-stage pump, the impeller is the sole element for transferring energy to the pumped liquid.

Multistage pumps can increase energy efficiency in the systems they are used in if replacing a single-stage setup. Multi-stage technology offers several advantages over traditional single-stage pumps when used to pump liquids that do not contain abrasives, solids or stringy material.

On the other hand, a disadvantage of very large numbers of stages is the increasing sensitivity of the pump rotor to external or natural vibrations. Multistage pumps maintenance is considered by some to be relatively more difficult than single stage pump. Because of the construction of multistage chemical pumps, each impeller/volute combination can be smaller in diameter and operate with a smaller gap between impeller and volute. This tight clearance between impeller and volute means that multi-stage pumps are not recommended for applications pumping liquids containing solids, abrasives, or stringy material. 

For engineers and decisionmakers looking to switch from single-stage setups to multistage, developments in multi-stage technology have eliminated the need for piping and pump support rework when retrofitting a multi-stage pump for a single stage pump, making it easier than ever to consider multi-stage pump replacement of traditional single-stage pumps.

What is a multistage pump used for?

TE-3MS-MD multistage chemical pumpMultistage pumps provide engineers with a flexible range of flow and head, along with their high degree of energy efficiency. For those reasons, multistage pumps are a great choice for many applications. 

March Pump offers a multistage pump, the TE-3MS-MD, which is made to accommodate various industrial settings.  It is made from Polypropylene plastic, which is better able to handle various chemicals, compared to 316SS.  The pump can handle chemical recirculation, chemical transfer, and deionized water systems. Its unique multistage design makes it perfectly equipped to accommodate higher heads. Able to work with lower flow rates, the TE-3MS-MD multistage pump is still unique in that it offers 87.0 FT of maximum head. 

How can March Pump help me with multistage chemical pumps?

March Pump has an extensive history in assisting clients with diverse business and engineering challenges. The March Pump team works to resolve those challenges with the help of the appropriate pump. 

March Pump has been providing unique business and pump solutions since 1954. We have grown extensively since then, serving clients from a variety of industries both domestically and internationally. The team at March Pump always asks that clients contact our experts directly, so that we may diagnose your situation and any chemical challenges you are facing.

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