The closed double suction impeller can lower the NPSHr due to each impeller eye only handles half of the total pump flow rate. And it also can increase the efficiency through back-to-back / double suction impeller design, as the power is not lost to balance the hydraulic thrust.
The bearings are located on both sides of the rotor, which reduces the deflection of the shaft and make the pump runs more stable.
Pumps generating high heads have dual volutes to reduce radial forces, ensuring minimal shaft deflection and low bearing loads.
And it’s with a wide installation versatility, the pump can be produced in horizontal or vertical mounting, clockwise or anti-clockwise rotation, side suction or bottom section.