Flexible Impeller Pumps: Frequently Asked Questions

Tapflo UK supply a wide range of pumps, with one of them being the Flexible Impeller Pump! These can be supplied with a variety of different materials and are highly versatile. Keep reading to find out more!

>> Follow this link for our Flexible Impeller Pump product page <<

What is a Flexible Impeller Pump?

Self Priming Flexible Impeller Pumps, also known as Flexible Vane Pumps, are a form of positive displacement pump. They move fluid from the suction port to the discharge port by trapping an amount of fluid between its impeller vanes and forcing it round towards the outlet. The vanes of the impeller deform slightly when rotating inside the pump casing, moving the fluid from the inlet to the outlet at a steady, pulse-less flow without pressure spikes.

This principle, combined with a gentle pumping action and a high self-priming capability, up to 6 m from dry, makes these units ideal for transfer, filling, dosing and filtration applications. Their design enables them to handle thin and viscous (up to 50, 000 cPs) fluids as well as solids in suspension (up to 25 mm). They are capable of discharge pressures of up to 4 bar and flow rates up to 1200 l/min & maximum fluid temperatures up to 120ºC.

What types of fluids would a Flexible Impeller Pump be used on?

The versatility and benefits of a Flexible Impeller Pumps mean they are great in a number of applications! See some of the most common below.

Oenological: wines, musts and stemmed grapes

Food: beer, fruit pulp and juice, honey, liquid sugar, syrups, glucose, milk, melted butter, yoghurt, liquid eggs, oil, tomato pulp and juice, brine, etc.

Chemical: starch, water based glues, emulsions, glycerine, wax, detergents, rubber latex, photographic processing liquids, polyelectrolyte, paints, ink, industrial discharges, etc.

Cosmetic & Pharmaceutical: liquid soap, cleaning lotion, cream, shampoo, etc.

What are the main benefits of a Flexible Impeller Pump?

There are many benefits of a Flexible Impeller Pump! To mention a few, they have extremely good self-priming ability of 6m, the pumps can be operated bi-directionally and come as standard with a reverse switch, they can handle solids of up to 25mm and viscosities of up to 50,000 cPs, pulse free pumping and finally the pump head can be positioned in 5 different orientations!

What material of Impellers can be supplied with a Flexible Impeller Pump?

We can supply your Flexible Impeller Pump with 5 different material impellers. See all five listed below with some examples of where they would be used. NBR: Has excellent resistance to oils & fats and is FDA Approved CR: Best balance between chemical & mechanical resistance EPDM: Best for hot fluids & CIP. Excellent with acids & alkalis. FDA Approved NR: Excellent with water based fluids at room temperature. Highest mechanical resistance VMQ: Best for high temperature, low mechanical resistance

Can you dry run a Flexible Impeller Pump?

The answer is no. We wouldn’t recommend dry running a Flexible Impeller Pump for anything over 60 seconds. If you're looking for a pump that has the ability to dry run, visit our Dry Running FAQ page.

High Viscosity Flexible Impeller Pump Case Study

Tapflo were recently approached by a small brewery pumping beer. The company were tired of using cheap and cheerful water centrifugal pumps to just see them fail, which is where Tapflo UK came in to save the day with a Flexible Impeller!

Application Details:

Fluid: Beer Viscosity: Approx. 1 cps

Flow Rate: 50lpm

Temperature: 45 degrees

Solids: None

Pipe Work: 1 1/4”

Discharge Pressure: 2Bar

Suction Condition: 2M

Pumping solution offered:

Pump Type: Flexible Impeller with EPDM Impeller

Materials: Stainless steel and EPDM

Connection Size: 1 ¼”

We supplied a Flexible Impeller Pump that was perfect for this flow rate. It was supplied with an EPDM Impeller which are perfect for beer as they are FDA approved and suitable for hot CIP. We also trolley mounted the pump so they can use on different applications.

If you require a similar pump or any assistance on fluid handling within your factory, then please get in touch on 02380 252 325 or email us at [email protected]

Tapflo GR Flexible Impeller Pump
Tapflo GR Flexible Impeller Pump
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