Pumping Molasses in the Winter

Pumping Molasses in the Winter

17 October 2018 Post by Helen McNulty Pumps 0 Comment(s)

Pumping Molasses

Whether pumping molasses on a farm, for a tank pump, for a dairy, for animal feed and agriculture, there are a few factors to consider when choosing the correct pump for your application. 

When pumping and handling molasses it is the viscosity of the liquid that is the most important factor.

What is the best type of pump for Molasses?

Viking Gear Pumps are ideal for Pumping Molasses, especially in the winter months. Here's why. 

Given the viscosity of molasses, a positive displacement pump must be used. Many types of positive displacement pumps are used to transfer molasses. Including rotary gear, lobe, worm and stator, sliding vane and peristaltic. There are two broad pump duty requirements, transfer pumps and variable speed metering pumps.
Viking 124A Gear Pump Ideal for Molasses

What information is needed to specify the pump unit needed for pumping molasses?

To know which pump unit you will need when pumping Molasses, the following information is needed: 
  • Viscosity of molasses at the lowest pumping temperature
  • Delivery pressure of the molasses for pumping.
Pumps should be provided with a pressure relief valve either as an integral part or installed in a loop between delivery and suction.
The Viking Pump internal gear pump meets all the criteria for pumping molasses, especially when it gets thicker in the cold months as they have built-in relief valves and can be used for transferring and metering.
Viking Pump Molasses pumps are capable of relatively high pressures so long pipelines and high viscosity can be catered for.

How to ensure a Molasses Pump lasts a long time.


In general, molasses pumps should be oversized and run at relatively slow speed. 

If you do this, they will last for many years and pay back the extra investment in reduced power consumption, maintenance and increased availability many times over. We have supplied spares for pumps 30 years old.

How to find the right pump and measure flow rate and viscosity of your pumping liquid.

To find the pump for your application, Viking Pumps pump selector is a useful tool.
You can inputting different flow rates and viscosity the correct pump can be selected.

How to use Viking Pump's Pump Selector Tool  

This takes a bit of patience
  • Select Pump Selector, Europe, Cast Iron, Packed.
  • Change the units. Example:
    • 7000cp for viscosity
    • 1.4 Specific Gravity 
    • 5Bar Pressure
    • Flow 200l/min, 

These parameters will select the LS124A - This is a standard pump for Molasses often used on road tankers.

Playing around with this will give you a feel for what happens when you change the parameters.


How to deal with Pipelines and Pressure Loss when Pumping Molasses

Viscosity has a very significant influence on the pressure loss in pipelines.
Here's how to deal with pressure loss problems
  • At a minimum, oversize the suction line a size larger than the pump and keep it short. 
  • Use a strainer to protect the pump, straight through type valves and calculate the pressure drop so the pipe is large enough.

How to calculate the Pressure Losses of my Pump? 

This site, (more patience), will calculate the pressure losses.
The result for high viscosity can be eye-opening sometimes.

Flow and Pressure Power - how to convert flow and pressure units.

The flow comes from the moving gears in the pump.
The pressure comes from the resistance to flow in the system.
The Power required is the Flow x Pressure.
If the different units for the same thing get you to try this free app

If you have got this far give us a call on 01 2750801.

Or Fill out an enquiry form here.

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