Case

- We didn't believe energy savings of this size were possible

With this new type of pump, Grundfos helps us realise our vision of supplying water sustainably to the people in our area.

Christian Portschy, managing director, WVSB

When he first saw the “small” size of the new pressure-boosting pump from Grundfos, Christian Portschy felt a bit sick with worry.

“I was very sceptical,” says Christian Portschy, managing director of Wasserverband Südliches Burgenland (WVSB), the water utility of Southern Burgenland in Oberwart.

WVSB had worked with Grundfos for many years – mainly in the submersible pumps area. Portschy heard that Grundfos was field-testing a new “extra-large” series of CR multistage pumps. WVSB could use these in its water booster supply application after sand filtration/backwash to lift the water into the storage tanks. And Grundfos suggested that the new CR could do the same work with up to 30% more efficiency than the current brand of pumps in the application. Portschy was interested to try it.

But when he saw its small size, he had second thoughts. “I didn’t think the pump would be able to cope and deliver the necessary water pressure,” he says. WVSB’s top priority, he adds, is to ensure a safe, energy- and cost-efficient water supply to Oberwart’s 50,000 residents.

Could the CR-95 deliver?

Christian Portschy stands with the Grundfos CR-95 pump for water boosting. Portschy is managing director of Wasserverband Südliches Burgenland (WVSB), the water utility of Southern Burgenland in Oberwart, Austria.

The solution and outcome

During commissioning in May 2017, the next uncertainties arose, Portschy says. The operators in the control room were in doubt: Are the power consumption readings correct? Is the small motor overloaded? Does the pump still run in its characteristic curve? Is it actually delivering 25 litres/second (l/s) – up to 8 l/s more than the big, old pumps? And was it actually working? It was not as loud ...

It did not take long for the doubts to clear, however. First measures revealed that for every litre per second delivered, the new Grundfos CR-95 used 689 W – versus 895 W from the old pumps. Further evaluations showed a max savings potential of 30%.

“Our goal for the future is to keep supplying water in a sustainable manner to the people in our area,” says Christian Portschy, managing director of utility WVSB in Oberwart, Austria.

“The pump clearly does its job,” Portschy says. “The readings have proven this huge savings in energy. We were quite surprised by the performance data.”

WVSB plans to replace the other three older pumps on the boosting line with CR-95s in coming months.

“We’ve achieved huge energy savings with this one pump,” Christian Portschy says. He adds that the pump fits in to the utility’s own ambitions of sustainability – which include its own solar energy supply installed on building rooftops nearby. With these 200 PV panels and the new pump and lower energy consumption, WVSB can now run important equipment in case of a power blackout.

The Grundfos CR-95 multistage pump at WVSB in Oberwart, Austria. The pump was much smaller than the other, older pumps from a different brand in the boosting/filtration application. Could it deliver?

“Our goal for the future is to keep supplying water in a sustainable manner to the people in our area. I’m very proud that we have won a stage in our vision for the future, so that we can supply future generations with this precious liquid at any time.”

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