Closed-Loop Cooling System Protects Wastewater Pumps From Overheating

Closed-Loop Cooling System Protects Wastewater Pumps From Overheating
Amarex KRT from KSB

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The Amarex KRT jacket-cooled wastewater pump from KSB features a sealed, closed-loop cooling system that uses an environmentally safe propylene glycol/water mix. The 38/62 antifreeze mixture protects the pump in temperatures down to -4 degrees F, while an impeller inside the pump circulates the glycol/water mixture around the motor and over a heat exchanger at the bottom of the pump, dissipating heat into the pumped liquid.

Mark Batcha, manager, KSB South-West Region, says the cooling-jacket pumps are designed for continuous duty in wet or dry environments.

“If the dry environment floods, the submersible motor is protected,” he says. “Where the pump is submerged in water, as an operator you can run these pumps down to a very low water level. Where you may have the motor exposed for long periods of time, these cooling jackets cool the motor and are not dependent on the fluid in the wet well to keep it cool.”

The closed-loop system is completely sealed against pumped media as well as the air-filled motor housing. It cools the motor without exposure to sewage or the need for an external source of water.

Applications include wastewater transport, municipal and industrial wastewater treatment, sludge treatment and stormwater transport. Pump sizes range from 4- to 30-inch discharge, up to 1,000 hp and flow rates over 45,000 gpm.

“It’s a very efficient system,” Batcha says. “As an operator, you do not need utility water to cool the pump, which can be expensive. It’s also easy to operate. You don’t have to worry about someone shutting off the waterline to the pump.”

The cooling-jacket pumps are available with a Type K multi-channel impeller, Type E single vane and Type F vortex impeller.

“The K multi-channel is highly efficient,” Batcha says. “Since it’s a multi-vane impeller, it’s trimmable to meet an exact duty condition. It’s also non-clog and passes the minimum 3-inch spherical solids. The E impeller is used on smaller pumps — up to 4-inch discharge — and can pass 3-inch spherical solids. The vortex impeller can handle whatever gets in the suction of the pump. It’s a troubleshooting impeller for stations that have a lot of rags, solids or fibers that are hard to pump. It’s not as efficient as the other impellers, but it’s very hard to clog.”

The closed-loop pump requires minimal maintenance. Coolant should be inspected every 8,000 hours or two years, and replaced every five years to ensure reliable performance. Numerous sensors constantly monitor the windings, bearings and mechanical seals, and are teleservice enabled for remote monitoring. Completely sealed cable entry points ensure safe operation if the cable is damaged. 804/222-1818;


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