Centrifugal Pump: Frequently Asked Questions

Tapflo supply a number of different pumps, one of which are Centrifugal Pumps. The Tapflo Team have put together a list of frequently asked questions and a case study using a Centrifugal Pump to ensure you make the right decision when selecting your pump!

Can I let my Centrifugal Pump run dry?

Running a Centrifugal Pump dry is a big no. The design of a Centrifugal Pump means that running it dry for even short periods of time will destroy your mechanical seal and potentially burn out your motor. To stop this, you should always install standard Centrifugal Pumps with flooded suction, unless you’re using a Self-Priming Centrifugal which is a fundamentally different design. If running dry is a risk during your process, you should consider installing some form of Dry Run Protection.

What is BEP (Best Efficiency Point) and Why Is It Important?

Best Efficiency Point is crucial at the time of selection; ensuring the pump is matched to the application will assist with long operating life. When a pump operates at BEP, it is at its most efficient, meaning the pump is using input power as efficiently as possible and reducing energy costs. When a pump operates at BEP it also produces the lowest vibration readings, meaning that pump longevity is increased and maintenance costs are decreased – something all users should be focused on when selecting the right pump.

Tapflo Magnetically Driven Centrifugal Pump (CTM)
Tapflo Magnetically Driven Centrifugal Pump (CTM)

What’s the difference between a Magnetically Driven Centrifugal and a standard Mechanical Seal Centrifugal?

Magnetically Driven Centrifugal PumpWhen considering which Centrifugal Pump technology to use you have to take a few key factors into consideration. Below is a list of benefits for each technology to allow you to make an informed decision.

Mag Drive Advantages

  • - No Seal between the fluid and the environment, making the risk of spillage drastically reduced.
  • - Has the ability to run dry for slightly longer than a conventional mechanical seal
  • - Quick and easy installation, no requirement for external piping for seal flush.

Standard Mechanical Seal Advantages

  • - More cost effective at point of instillation.
  • - Higher flow and head possible
  • - More options for monitoring of operation.

The bottom line is, when deciding which type of pump you require, the main factor should be the fluid you’re pumping. It’s always worth consulting with an expert when specifying a pumping application.

Centrifugal Pump Case Study

A longstanding customer of Tapflo recently contacted us for two low-flow stainless Centrifugal Pumps, which the Tapflo Team were more than happy to help with.

Details customer provided:

Two off @ 50mm for a water based dye – these need to deliver 50 litres per minute, the line length approx. 160 meters 22 bends again 6 meter head

Solution provided:

Horizontal End Suction Centrifugal Pump, ATEX Rated

85 mm Vortex Impeller

1”/¾” ISO G Threaded Connections

AISI 316 Construction

SiC/SiC/Viton Single Mechanical Seal

0.55 kW/2 Pole/230-400V/3 Ph/50 Hz/IP55/Class F/

IE3 Motor, ATEX Exd IIB Zone 1 (Gas) T4 Rated

The pump was ordered and delivered within two weeks of receiving the enquiry. Tapflo always strive to offer the best possible service and are now looking at other applications on the same site. For advice with your pump order, contact the Tapflo Team today by emailing [email protected] or call 02380252325.

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