Applications for pumping come in a wide variety of thicknesses, meaning the pump you need will depend on the thickness of your product. There are a number of other factors to consider alongside this, but this case study will be focusing on viscosity. Our frequently asked questions are listed below to run you through what viscosity is and what to consider when pumping products of high viscosity.
What is ‘viscosity’?
Viscosity is the thickness, stickiness and semi-fluid consistency of a product. For example, water would have a very, very low consistency whereas something like Vaseline would have a very high viscosity. Here at Tapflo, we use centipoise to measure the viscosity of a product, although there are other units of measurement used.
What pump type is best for high viscosity products?
Depending on a number of factors in the process, Tapflo has a number of pumps suitable for highly viscous products. Our Diaphragm Pumps can support products up to about 10,000 cPs, whereas our Lobe and Twin Screw Pumps can support products of up to 1,000,000.
What is the most important thing to consider when specifying a pump for viscous products?
Selecting a pump for viscous products can be slightly challenging…for some people anyway! Not for the Tapflo team! It’s important to remember that priming a pump can be a difficult task with viscous products, especially if they are thick and sticky like golden syrup for example! It’s also important that flow rates will be dramatically less than shown on performance curves when pumping viscous products! Viscous products tend to get thinner and easier to move when they are heated, it’s important to state the temperature the product will be pumped at!
High Viscosity Pump Case Study
Tapflo were recently approached by a cheesecake Company. They needed a pump to cheesecake mix from large 500L mixers and deposit into a production line hopper.
Fluid: Cheesecake mix containing honeycomb chunks
Viscosity: Approx. 200,000 cps
Flow Rate: 200lpm
Temperature: 2 degrees
Solids: Some 10mm chunks
Pipe Work: 3 1/2”
Length of discharge: 2m vertical 3M across
Suction Condition: 1.5M
Pumping solution offered
Pump Type: Twin Screw Pump
Materials: Stainless steel
Connection Size: 3 ½”
After trialling a few pumps the customer wanted a pump that would keep the marble effect of the cheesecake and not crush any of the solids in the mix. A twin-screw was perfect for this application as it is gentle on the product and can pump products of up to 1,000,000. The pump was installed and the customer was happy with the end result.
If you require a similar pump or any assistance looking for a solution for your fluid handling, speak to one of our Pump Specialists.