Selection brief: Match the cyclone bank’s flow and inlet pressure, then verify slurry conditions, suction requirements and operating flexibility.

Cyclone feed pump selection starts with the hydrocyclone bank’s requirements. The pump must deliver the specified slurry flow at the required cyclone inlet pressure across the expected operating conditions—not simply produce enough pressure at its discharge.

Slurry density, sump level and the number of active cyclones can change the duty. A pump selected for one nominal point may therefore be unsuitable at reduced throughput or another bank configuration.

For abrasive mineral slurry, a heavy-duty pump is worth assessing first. A high-head design may be appropriate when the calculated head requires it, but cyclone feed does not automatically mean high-head service. The following checks help define a practical specification.

1. Establish the Cyclone Feed Flow

Obtain the cyclone supplier’s required feed flow, inlet pressure and approved operating range. Confirm how many cyclones normally operate and which alternative combinations the plant expects to use.

For preliminary screening, total feed flow can be estimated from the number of active cyclones multiplied by their specified flow. Confirm this against the actual slurry and manifold arrangement.

In a closed grinding circuit, fresh ore throughput alone does not establish pump capacity. The pump may also handle circulating solids and dilution water. Use the circuit mass balance to determine the slurry volume reaching the feed sump.

Prepare normal, minimum and maximum duties using combinations that can realistically occur together. Avoid combining unrelated maximum values into an unnecessarily oversized selection.

2. Convert Inlet Pressure into Required Head

Cyclone inlet pressure is only one part of the pump’s total head requirement. Convert its pressure contribution using:

For an open sump feeding a cyclone manifold, the complete calculation includes elevation from the sump surface, suction and discharge losses, required manifold pressure head and relevant velocity-head differences.

Confirm whether the cyclone specification refers to inlet gauge pressure or pressure drop across the cyclone. Outlet backpressure and measurement locations can affect the interpretation.

A pump discharge gauge does not directly confirm manifold pressure. Include the losses between those locations, and define the pressure-control measurement point in the specification.

3. Check the Full Operating Range

Ask the supplier to review each duty against the proposed pump curve, operating speed, slurry corrections and power requirement.

The Hydraulic Institute distinguishes preferred and allowable operating regions. These limits depend on the pump and should be confirmed for the proposed selection rather than assumed from a universal percentage around the best efficiency point. www.pumps.org

A heavy duty slurry pump is a starting point for abrasive continuous service. Consider a high head slurry pump when the combined pressure, elevation and piping losses require a higher-head hydraulic configuration.

4. Provide Complete Slurry and Suction Data

Report slurry SG, solids concentration and whether concentration is measured by mass or volume. Include particle-size distribution, maximum credible particle size, chemistry and temperature.

Mixture density and solids characteristics are material-selection inputs; SG alone does not identify the correct wet-end material. 

Distinguish normal feed from occasional oversize following process upsets. Identify entrained air or froth where present, and request the exact proposed material grade.

For suction assessment, provide minimum sump level, pipe dimensions, temperature and site elevation. Ask the supplier to check available suction head against the pump’s requirement with an appropriate margin. A flooded inlet does not complete that assessment.

5. Coordinate Pressure, Level and Density Control

Specify how the plant will manage cyclone feed pressure, sump level and feed density. These variables should be reviewed together.

A variable-speed drive may help maintain pressure, but the approved speed range must also respect pump, motor and suction limits. Increasing speed is not a universal solution to low sump level, changing slurry conditions or worn components.

Research on hydrocyclone classification circuits illustrates the interaction between feed disturbances, sump conditions, dilution water and pump control. It supports assessing the complete circuit rather than pressure alone. www.saimm.co.za

Agree on the response when cyclones enter or leave service, including pressure limits and low-level protection.

Illustrative Example: A Preliminary Duty Calculation

Illustrative example only—not a product rating or recommended cyclone pressure.

Assume the following confirmed design inputs:

The pressure-head contribution is:

Neglecting velocity-head differences for this preliminary example:

The initial target is approximately 180 m³/h at 23.4 m of slurry head.

This does not select a model. Particle data, corrected pump performance, suction conditions and alternative duties still need checking. If density or the active cyclone combination changes, reassess the corresponding duty rather than retaining the original setting automatically.

Include Maintenance and Spare Parts

Review access, isolation arrangements, seal requirements and any flush-water supply before ordering. Confirm identification and availability of the proposed slurry pump wear parts.

For an existing circuit, supply measured operating data and photographs of removed components. Use What Information Is Needed to Order Replacement Slurry Pump Parts? to organize replacement identification separately from hydraulic selection.

Compare maintenance requirements using operating records where available. Avoid selecting solely on purchase price or an unsupported wear-life promise.

Frequently Asked Questions

👉Can one pump feed several cyclones?

Yes, if the pump and manifold suit the approved bank configurations. Check total flow, inlet pressure and control limits for each expected combination.

👉What cyclone inlet pressure should I use?

Use the cyclone supplier’s requirement for the actual equipment and feed conditions. A generic pressure value is not a substitute.

👉Does cyclone feed always require a high-head pump?

No. Calculate the complete duty first. Pressure, slurry density, elevation and piping losses determine the required head.

👉Can increasing speed compensate for wear?

It may recover some duty, but only within approved limits. Review power, suction conditions and component condition before changing speed.

👉Is motor current enough to verify feed performance?

No. Review it alongside manifold pressure, density, speed, sump level and flow where measured.

Request a Cyclone Feed Pump Review

Provide the required flow and cyclone inlet pressure, active cyclone combinations, slurry SG, solids concentration, particle sizes, pH, relevant chemicals and temperature. Include sump levels, pipe layout, elevation and the proposed control arrangement.

For an existing installation, add pressure measurement locations, operating speed and maintenance records. These details allow hydraulic duty, material suitability and operating flexibility to be reviewed before quotation.