Oslo Municipality

Oslo City Energy optimization - Disen pump station


Oslo Municipality wanted to make an assessment of pumps at Disen pump station, in cooperation with Fuglesangs AS, as surveys indicated that these did not work optimally. The test result shows clear improvements on all parameters.


The municipality's own investigations and experiences as well as the results from the Master thesis "Energy optimization of pumping stations in the municipality of Oslo's drinking water network" by Rune Myra showed that the pumps on, among other things. other Disen pumping station most likely no longer worked optimally.

After meetings and presentation of Fuglesang's Energy Optimization program, it was decided that one of the pumps should be taken out to do an upgrade and energy optimization where the result before and after should be measured and logged at Fuglesang's test facility.

The energy optimization consisted of inspecting and composite coating the inner pump housing with ARC ceramic composite to achieve the lowest possible surface energy, as well as repairing wear wear with the right tolerances. In addition, full renovation with bl. other stock exchange and renovation of mechanical shaft seals.

In connection with test driving, we measure and log quantity, pressure, speed and kw. Based on the measurements, we calculate the efficiency of the pump. The result before and after we see in the table below (more complete table as a separate attachment). The pump was run according to parameters on the given pump curve and normal operating situation.

As pictures further down in the report show, the pump was in surprisingly good condition. This is because the pump already had a surface coating from earlier which prevented grouting and erosion. The potential for energy saving will be greater the worse the condition the pump is in.

Further down in the report, we have also included the test result in tables that show savings potential in clean energy. The savings depend on how the pump is run and how to use measured values.

We will see the great savings potential if this upgrade proves that one can avoid running as many pumps as before to keep the necessary pressure and quantity online.

In accordance with ABB, existing engines have an efficiency of just under 93%. New IE3 engines have an efficiency of about 96%, so here too there is a lot of energy saving.

In addition to the energy saving, this type of upgrade offers less wear and tear and a more reliable pump for safer operation.