High performance, large energy savings and lower running costs – these are the features, which distinguish the ZN8 submersible pumps from Lowara, an ITT Industries Group company.

With its innovative construction and performance characteristics, the new ZN8 pump constitutes a forward thinking solution for all water pumping problems, says a spokesman.
The eight-inch diameter pumps with flow-rates up to 180 cu m/h and heads up to 550 m means that they can be used in aqueducts for supplying drinking water, in water pressurisation and distribution installations for civil and industrial use, and in irrigation systems for farms and large green areas such as parks and golf courses, he adds.
In addition, the pumps can also be installed in fountains, in pumping systems for fish farms, in water supply systems from deep wells and last but not least, for dewatering in civil engineering, mining installations, and a host of other applications.
He continues: “The pumps guarantee superior performance especially in terms of efficiency and reliability. The pumps assure a maximum efficiency of 80 to 82 per cent thanks to construction features with a high technological profile: the exclusive use of a dynamic wear ring (to minimise internal losses) on one hand and on the other, the use of precision castings to obtain very smooth surfaces and reduce tolerances to a minimum, thereby contributing to enhanced pump performance.
“But the advantages do not end here as ZN8 pumps are also better in terms of energy and the associated cost savings.
Savings from the reduced energy consumption come from the pumps’ high efficiency levels: these can be increased further by combining the new pumps with the Hydrovar variable speed device which can adapt the pump performance to the exact demand.
“On the other hand, from an economic point of view, the pumps have reduced running and maintenance costs both because of the significant energy savings associated with their greater efficiency and because of the use of materials with very high performance in terms of resistance to corrosion and wear,” he says.
The main pump components are made of precision-cast AISI 316 stainless steel – a material with high mechanical strength – which makes it possible with minimum wall thickness to obtain the same performance as traditional materials. For this reason ZN8 pumps are lighter and therefore easier to transport and especially to install.
To tackle corrosion, critical components of the ZN8 – such as the shaft, conical locking sleeve and pump coupling – are made of Duplex stainless steel. Furthermore, abrasion tests have revealed that the ZN8 has a remarkable permitted sand content capability of 100 g/cu m, which means greater resistance to wear and therefore the added benefits of stable performance over time, longer pump life and minimum maintenance costs.
With the new ZN8, Lowara confirms its role as a forward thinking company in hydraulic pump design and pumping system solutions, he concludes.