MagnaDrive - The MagnaDrive Adjustable Speed Drive Installations

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Washington Mutual Tower
Seattle, Washington
Jeff Kasowski, Chief Engineer

Application: Motor running a centrifugal HVAC chilled water pump. The pump ran full speed during warm days against a pinch valve that was manually throttled depending upon the cooling requirements in the building.

Application Specifications: 125 HP, 1800 RPM, 480 volts, motor connected through an elastomeric coupling to a centrifugal pump. Vertical solid shaft application.

Problem: The pump was running against a pinched valve during normal operations resulting in cavitation and vibration. These factors increased maintenance on the application. Energy was wasted when water pressure was controlled through the pinch valve.

MagnaDrive Solution: Replace control valve with 18.5 MagnaDrive ASD. The motor was moved up onto a raised base and an actuator was installed and connected to the process control system.

Customer Resolution: The MagnaDrive ASD eliminated the bypass valve with a potential energy savings of 31%. The cavitation was eliminated and vibration was dramatically reduced, lowering long-term maintenance costs.

Customer Comments: "Control is much greater than any VFD. The large footprint is not needed, and harmonics are not an issue. We don't have to replace couplings annually and deal with aligning the pumps and motors. The noise disappeared as soon as we started it. MagnaDrive… WOW!"
Jeff Kasowski,
Chief Engineer.

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