Tips For Buying Centrifugal Pumps

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Here are some important tips while buying a centrifugal pump. Here are some important tips while buying a centrifugal pump.

Pump SelectionPump Selection

Avoid over sizing of your pumps as this results in uneconomical Avoid over sizing of your pumps as this results in uneconomical operation of the pump. It also narrows the safe operation range of operation of the pump. It also narrows the safe operation range of capacities of the pump.capacities of the pump. Avoid pumps with a really low NPSH (Net Avoid pumps with a really low NPSH (Net Positive Suction Head) and remember not to falsify the actual NPSH. Positive Suction Head) and remember not to falsify the actual NPSH. Resorting to this leads to choosing of pumps with excessively high Resorting to this leads to choosing of pumps with excessively high suction speeds and high minimum flows. Evaluating the advantage of suction speeds and high minimum flows. Evaluating the advantage of variable speed operation will be useful as it is efficient and results in variable speed operation will be useful as it is efficient and results in longer pump life. Be careful not use a mechanical seal when packing is longer pump life. Be careful not use a mechanical seal when packing is more than adequate for the intended use. more than adequate for the intended use.

InstallationInstallation

Ensure adequate submergence over intake piping to prevent formation Ensure adequate submergence over intake piping to prevent formation of vortex. Suction elbows should always be placed over the in the of vortex. Suction elbows should always be placed over the in the plane perpendicular to the shaft and not parallel. Pump casing plane perpendicular to the shaft and not parallel. Pump casing should not be used as an anchor for the pump. All expansion joints should not be used as an anchor for the pump. All expansion joints and supports should be anchored independently. Providing and supports should be anchored independently. Providing adequate flow, pressure and temperature instrumentation for the adequate flow, pressure and temperature instrumentation for the pump are imperative. Pump and driver alignment have to be pump are imperative. Pump and driver alignment have to be rechecked under normal operating conditions.rechecked under normal operating conditions.

OperationOperation

Ensure you do not operate pumps below the recommended minimum Ensure you do not operate pumps below the recommended minimum flow or when suction valve is closed. Ensure you do not run two flow or when suction valve is closed. Ensure you do not run two pumps parallel when one pump can carry the load. Make sure that pumps parallel when one pump can carry the load. Make sure that air is kept out of the pump, pumps are made to carry liquids only. air is kept out of the pump, pumps are made to carry liquids only. Stop the pump immediately is any excessive noise or vibration Stop the pump immediately is any excessive noise or vibration occurs. Run spare pumps once in a while to check their efficacy.occurs. Run spare pumps once in a while to check their efficacy.

MaintenanceMaintenance

Running performance test at frequent intervals will help you to follow Running performance test at frequent intervals will help you to follow increased internal clearances. Avoid opening of pumps unless any increased internal clearances. Avoid opening of pumps unless any evidence proves it necessary. Lubricating or greasing of lubricated evidence proves it necessary. Lubricating or greasing of lubricated bearings are not necessary, avoid doing that. Packing stuffing boxes bearings are not necessary, avoid doing that. Packing stuffing boxes needs experienced hands, leaving it to inexperienced hands will prove needs experienced hands, leaving it to inexperienced hands will prove detrimental. Avoid tightening stuffing box glands too much. Leakage detrimental. Avoid tightening stuffing box glands too much. Leakage needs to flow smoothly to cool and lubricate properly. Always use original needs to flow smoothly to cool and lubricate properly. Always use original spares excepting in an emergency. Examine and recondition your pump spares excepting in an emergency. Examine and recondition your pump regularly. Look out for corrosion in your pumps. Always new gaskets in regularly. Look out for corrosion in your pumps. Always new gaskets in your pumps when overhauling them.your pumps when overhauling them.

Follow these steps and your centrifugal pump will serve you well for years.Follow these steps and your centrifugal pump will serve you well for years.

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