• January 14, 2020
  • Tim Wolstencroft
  • Blog

While selecting submersible pumps, users look for a pump that can successfully deal with different liquids and wastes on a regular basis. The first requirement is definitely to choose the right pump. After purchasing the correct pump, it is important to maximise pump performance to its optimal level. Most of the pump manufacturers and distributors these days provide the necessary recommendations ad guidelines for optimal submersible pump performance.

Mentioned below are some simple tips for optimising the performance of submersible pumps.

Operate at the BEP: BEP or Best Efficiency Point is the flow at which, for its impeller diameter, the pump is capable of operating at its optimum efficiency. At this stage, the radial and axial loading experienced by the bearings of a pump is at the lowest possible value. In case of insufficient flow, the low velocity will be inadequate for moving the solids through the system and clogging may take place. On the other hand, if the velocity is too high, clogs are formed because the solids may not get shredded because of too much velocity. The radial loading increases in both scenarios, causing inefficiencies in performance.

Pump Cycle Minimisation: The number of pump starts can be minimised by balancing the discharge rate and the influent rate. If the wet wall is too small, you may have to repeatedly fill it up and drain it down. Every minute or two, there is a chance of short-cycling of the pump until it fails because of overheating. Fewer cycles will ensure that the motor remains cooler and the pump is able to run smoothly.

To minimise the cycles, you may try out the following alternatives.

  • Match the influent rate more closely by changing the pump size.
  • Increase the size of the basin.
  • Maintain a constant wet wall level by using a variable frequency drive (VFD)

Matching Pump Size to the Pipe Size: In wastewater systems with more solids and flushable wipes, to prevent solids from settling and plugging the system, a velocity of approximately seven feet per second is required. An even higher velocity may be required for slurries and heavier solids.

As we all understand, the pipe size significantly impacts the velocity. Higher velocity is required in oversized pipes to prevent solids from clogging. On the other hand, the head to the system increases in undersized pipes, increasing friction and reducing flow. This is why it is important to ensure that the pump size matches the pipe size.

Tips for Installed Pumps: If you have installed pumps, consider minimising your repair costs by following these additional tips.

  • Instead of using power cords, pull the pump by installing a lift system.
  • Installation of a seal fail circuit will help you receive alerts about leaked seals for timely replacement.
  • Carry out preventative maintenance twice a year, checking the impeller, seals, oil, etc.
  • Before using it for the first time, check the rotation before putting the pump into the sump.

At Tru-Flo Pumps, we provide comprehensive support for all types of pump packages and systems. If you have any other questions related to your submersible pump system, please contact our experts.