End Suction Pump

End Suction Pump

An End Suction Pump is a type of Centrifugal Pump where the suction is axial and the discharge is at 90 degrees to the suction. Many designs have a centre line discharge to comply with worldwide or regional standards.

An end-suction centrifugal pump can be long coupled (separate coupling & motor) or close coupled (where the motor is in the same unit with the pump) often referred to as a Monobloc. Usually on larger end-suction pumps, the casing’s main feature is a dual volute to reduce the forces acting on the impeller, motor, shaft and bearings.

It is the most common type of pump worldwide. Its construction is relatively simple as is the operation. It can range from tiny flows and pressures to huge flows and moderate pressures. Usually, it is a single stage pump but some manufacturers make multi-stage versions. The most common materials used are cast iron, bronze and stainless steel.

There are many different versions of impellers available – enclosed radial flow (most common), semi-open, vortex, helical screw, disc rotor and barske design impeller.

End suction pumps are usually designed as a back pull out pump with a spacer coupling which facilitates maintenance without disturbing the alignment with the motor. Hence, they save on space and eliminate the need for motor alignment.

Some Manufacturers provide tangential discharge pumps which facilitate higher efficiencies, for example, some of the larger tangential discharge pumps can provide 90% efficiency.

Some typical applications for an end suction pump;

  • Any transfer or circulation of liquid. Handles clean or dirty liquids, and liquids with low viscosity.
  • Solids Handling
  • Slurries
  • Chemicals

What is the difference between the Inline and End Suction Pumps?

The inline pump is a derivative of the end suction where the suction and discharge is on the same axis which simplifies the installation into the piping systems without the need for expensive foundations.

What is the difference between the vertical and horizontal end suction pump?

An end suction pump is usually mounted in the horizontal position. The Vertical end suction pump should never have the motor underneath in case of a leak and water finds it way to the motor.

What is a base mounted end suction pump?

If a pump is  long coupled and uses a coupling to join the pump and motor together it will require a common base plate or frame i.e some means of supporting the drives/machines. A good base plate and foundation design is particularly important for large and heavy machines to reduce the effect of vibrations and movement which will be detrimental to the reliability.

End Suction Pump piping detail:

Some good piping practices include;

  • Piping should be generously sized to permit easy flow into the suction and arranged in such a way as to eliminate air pockets.
  • Good practice is to have at least 10 pipe diameters of straight pipe into the pump suction in order to be able to normalise the flow,  eliminate the turbulence and optimise the pump reliability.
  • If this is not possible due to space constraints then engineered accessories such as suction diffusers are available.

How we can help you?

Flexachem are the leading distributors for the sizing & design of Flowserve Durco Pumps in Ireland. We offer a wide range of Durco End Suction Centrifugal Pumps for both the Chemical and Process Industries.

– Flowserve Durco ANSI & ISO Chemical Process Pumps

Flexachem can also offer Flowserve Polychem Mag Drive & mechanical sealled Pump – information available upon request.

We provide localised technical support & on-site service engineering to support the operational needs of our clients. We also hold a heavily stocked inventory to help take the pressure off you in the event of unexpected emergencies.

Contact one of our Pump Product Specialists to find out more…..

Contact our Pump Specialist Team:

Phil Soltan (External) – mob: 086 185 3782

Internal Team

Adrian McSweeney – tel: 021 461 7212

Paul-Fox Morris – tel: 021 461 7231

Una Long (Pump & Service Support) – tel: 021 431 7200

Tel: 021 4617 200