We have a pumping system that handles dirty fluids with sticky soft particles. F

Question

We have a pumping system that handles dirty fluids with sticky soft particles.  For this reason, we are using semi-open impellors on our centrifugal pumps. Our company performs a project that increases the cleanliness of the fluids, and greatly reduces the quantity of sticky soft particles in the liquid that is to be pumped (a filtration project upstream of the pumps).  

Now that the fluid has changed, list 3 potential modifications to the pump that would improve pump efficiency / performance (2 marks)

If you could only do one, which one would you like to do? Why?  (5 marks)

Explanation / Answer

To understand a pumping system, one must realize that all of its components are interdependent.
When examining or designing a pump system, the process demands must first be established
and most energy efficiency solution introduced. For example, does the flow rate have to
be regulated continuously or in steps? Can on-off batch pumping be used? What are the flow
rates needed and how are they distributed in time?
The first step to achieve energy efficiency in pumping system is to target the end-use. A
plant water balance would establish usage pattern and highlight areas where water consumption
can be reduced or optimized. Good water conservation measures, alone, may eliminate the need
for some pumps.
Once flow requirements are optimized, then the pumping system can be analysed for energy
conservation opportunities. Basically this means matching the pump to requirements by
adopting proper flow control strategies.

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