1. Direct drives

Direct drive is the most common drive mode, which is often seen in the application of horizontal and vertical pumps. Pump, motor are directly connected. The speed of the motor is the rate of the pump.

direct drive

2. Indirect drives

Indirect drives are used for horizontal and vertical pumps, comprising motor (in various drive arrangements) and transmission (V-belt or gearbox.)

V-belt Drives:

A V-belt drive provides the most economical drive arrangement. There are several drive arrangements available for electric motors with belt drives, i.e. CV drive (overhead mounted), ZVz drive (reverse overhead mounted) and CRz drive (side mounted).

CV drive ZVz drive

CV drive and ZVz drive

CRz drive

CRz drive

The most common drive arrangements are CRz drive and CV drive. CV drive is generally the most economical and lifts the motor off the floor away from spillage.

If the pump is of [back pull out" design and assembled on a [sliding maintenance base", servicing can be significantly simplified.

Limitations CV drive:

The size of the motor is limited by the size of the pump frame. If overhead mounting cannot be used, use side mounted motors (with slide rails for belt tensioning).

V-belt transmissions (fixed speed drives)

Impeller diameters of Slurry Pump (hard metal or elastomers) can not be easily altered, therefore, in order to change the performance, the speed must be changed. This is usually done with a V-belt drive. By changing one or both pulleys, the pump can be "fine-tuned" to achieve the duty point even when applications are changed.

Provided the belts are tensioned correctly, modern V- belt drives are extremely reliable with a life expectancy of 40 000 hours and a power loss of less than 2%.

V-belt transmissions – limitations

When pump speed is too low (dredge pumping) or when the power is too high, V-belts are not suitable.

In these cases gearboxes must be used.

Variable speed drives

For certain applications (varying flow conditions, long pipe lines, etc.), variable speed drives should be used. With variable speed drives the flow of a centrifugal pump can be closely controlled by tying the speed to a flow meter. Changes in concentration or particle size then have a minimal effect on flow rate.

Should a pipe line start to block, the speed will increase to keep flow velocity constant and help prevent blockage.

Modern electronic drives, particularly variable frequency drives have many advantages (can be used with standard motors) and are widely used.

VFD drive

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