Centrifugal Pump and Products

What is a Centrifugal Pump ?

A centrifugal pump is a fluid ‘transfer pump’ which gives velocity energy to the fluid so that it will be converted to pressure energy. It is a kinetic machine which converts mechanical energy into hydraulic energy through a centrifugal force.  A centrifugal pump is installed in a hydraulic system with a concrete flow (Q) and a concrete pressure/ Head (H) where a fluid is transferred from one point to another.

Centrifugal Pump

What are the components of a Centrifugal Pump ?

An impeller is a rotating component of a pump, usually made of iron, steel, aluminium or plastic, which transfers energy from the motor that drives the pump to the fluid being pumped by forcing the fluid outwards from the centre of rotation.

Impeller PumpTypes of Centrifugal Pump

There are various types of Centrifugal Pumps including;

  • Radial Flow Centrifugal Pump
  • Mixed Flow Centrifugal Pump
  • Axial Flow Centrifugal Pump – ANSI (ASME) or ISO
  • Sanitary Centrifugal pump
  • Magnetic Drive Pump

How to select a Centrifugal Pump ?

In order to make an informed pump selection, whether to opt for a  Centrifugal Pump type or an alternative pump there are some basic criteria which every engineer must first fully understand and know:

  • Flow rate
  • Total dynamic head or pressure required
  • Specific gravity (or density) of fluid
  • Other properties i.e. viscosity, corrosive, aerated
  • Suction conditions i.e. lift or low NPSH available (NPSH is the suction pressure needed to avoid damaging cavitation)
  • Nature & size of any solids present
  • Single or multiple duty point (dynamic system)

When we know the above data, we can then think about selecting an appropriate pump. But wait! Has a safety margin been added to the calculated system pressure drop?

As the pressure drop is based on a calculation using a software, it is, in reality, only a ‘best guess’. Therefore, a safety margin should be added so that the pump is guaranteed to give the desired flow rate. This raises the next question, how much?

This is where care needs to be exercised. If too much of a margin is added, the pump will always try to find the intersection of the system curve (pressure drop vs. flow), even if this is detrimental to the efficiency and reliability of the pump.

See diagrams below of a good pump selection vs a poor pump selection to fully illustrate this point:

centrifugal pump performance data

How we can help you?

At Flexachem, we firmly believe if mechanical equipment components are correctly sized and maintained from the onset, the operation will be both efficient and reliable. And with increasing emphasis and demands being placed on the design, efficiency and maintenance of Pumps within your fluid handling systems; we are here to assist you in selecting the best process solutions product for your engineered chemical, product containment and transfer application.

We offer a range of Centrifugal Pumps for both the Chemical and Process Industries.

We also offer Process Improvement Services for your Pump Health Check such as:

Pump Laser alignment and Condition Monitoring

this service includes vibration analysis, cavitation checks, bearing conditions, temperature and speed measurements with detailed reports of findings and recommendations.

• Service Centre where we have a Centrifugal Pump Repair Facility for ISO/ANSI (ASME) Pump repairs.

FlowSelex Pump Performance Curves.1You can also access our Pump Selection Tool => the Flowselex Portal – it is an on-line Pump Sizing and Selection Program designed for clients to use and view pump performance curves and GA drawings when required.

To get your own login details – click here

To find out more about the Pump Sizing Program and/or to get a list of the Flowserve Pumps which are serviced by the Affinity Pump Selection Tool  – click here: FlowSelex Training – Portal

Contact our Pump Specialists:

Phil Soltan (External) – mob: 086 185 3782

Adrian McSweeney (Internal)

Paul-Fox Morris (Internal)

Tel: (021) 4617260

E-mail: sales@flexachem.com