As a result, double suction pumps are also less vulnerable to the wear and tear caused by axial thrust, which occurs when water enters the impeller. Since water enters both sides of a double suction impeller, one side effectively cancels out the axial thrust of the other – assuming that flow is even on both sides. But since that is not always the case, double suction pumps have inboard and outboard bearings to absorb some of this load. These bearings can afford to be smaller than those on single suction pumps simply because there is better balance across the shaft of a double suction pump.
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We typically recommend a double suction pump design for HVAC applications around 2,000 GPM or an 8” pump size. When it comes to applying a double suction pump we suggest:
(1) Selecting a pump with the shortest shaft span possible to minimize shaft deflections.
(2) Specifying based-mounted pumps with flexible couplers whenever possible. These pumps are easier to service than double suction inline pumps, which require the motor to be removed to periodically replace worn out throttle bushings.
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Generally speaking, a double suction pump can be twice the cost of a comparable single suction design. Obviously, pricing is positive when it comes to single suction pumps. They are also easier and less expensive to maintain. On the other hand, double suction pumps last longer – as much as 30 years. The double suction design eliminates the axial forces on the impeller which allows for higher flows than single suction.
When it comes to selecting a double suction pump, there are three types to choose from, including:
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