Wastewater Pump Efficiency – Look Deeper than “Wire to Water”

Selecting the most efficient wastewater pump for any application is not as easy as looking at pump and motor efficiency curves according to Gorman-Rupp pump distributor, Hydro Innovations.

“Wire to water” efficiency plays a part in overall wastewater pumping efficiency, but “other efficiencies” play a major role in pump savings (or costs) over the life of an installation. Every time a pump chokes or operators need to intervene for any reason, this adds to the inefficiency of the pump system. If a pump chokes often, or is difficult to remove chokes from, this can greatly outweigh any energy savings made by selecting an “efficient” pump.

Gorman-Rupp wastewater pumps are mounted at ground level – not in the wastewater, making them easy to access for monitoring, maintain and accessing to remove any blockages. They are also the easiest pump to keep at their best efficiency point because operators can adjust internal pump clearances without removing the pump from service and without exposing operators to “working at heights”, working over water” or “working with cranes”.

One operator with two spanners can adjust internal clearances in under 5 minutes. This makes a Gorman-Rupp wastewater pump very efficient in areas that drag other pumps down.

Also, the costs of complying with confined spaces regulations and adhering to best practice WH&S methods is growing, adding to the inefficiency of pump systems that are labour intensive when interventions are necessary – like those necessary for submersible wastewater pumps.  Asset owners can expect greatly reduced costs in this area when they choose Gorman-Rupp pumps for their wastewater systems, because self priming pumps do not require wet well lids to be open, confined spaces trained personnel for the interventions, or the use of cranes or other lifting devices.

Losing the “pump efficiency game” could be a very costly experience, although most of these costs will be hidden within general “R&M” budgets. These are often a lot harder to recognise than “black and white” efficiency curves, but none the less, are just as costly, or more so than any energy saving made by selecting the most “efficient” pump.