Pumping Molasses in the Winter
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?
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.
What information is needed to specify the pump unit needed?
Do know which pump unit you will need when pumping Molasses, the following information is needed:
- Viscosity at the lowest pumping temperature
- Delivery pressure.
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 these criteria, they have built-in relief valves and can be used for transferring and metering.
They 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, 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.
Viking Pumps pump selector is a useful tool and by 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.
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.
Where can I get help calculating 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
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.
Right now, in the month of October 2018, Thomson Process is offering a FREE Seal Maintenence kit with every Viking 124A Series pump sold for Molasses Application only. This is a non-transferable offer - the money value is not offered.
For full details of the offer and to sign up to our newsletter, please visit https://mailchi.mp/47b96c802ff9/molasses-pump-offer-thomsonprocess
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