Membrane and Piston Slurry Pumps
Positive displacement slurry pumps built for abrasive, high-solids fluids at high pressure, with wear parts you plan for.
Do I need a slurry pump or will a centrifugal pump do?
If the fluid carries a heavy load of abrasive solids and has to move at pressure or over distance, a positive displacement slurry pump is the right tool. A centrifugal pump can move dilute slurry but wears its impeller quickly and loses efficiency as solids and pressure climb. Membrane and piston slurry pumps are made to push thick, gritty slurry with wear parts that are planned and replaced on schedule. If the slurry is light and low pressure, a rugged centrifugal may still be the economical choice.
Membrane slurry pumps
A membrane slurry pump uses a flexible membrane to separate the pumped slurry from the drive side of the pump. The drive flexes the membrane back and forth, displacing slurry through the pump valves, while the abrasive fluid never touches the drive mechanism. That isolation is the key advantage: it protects the moving parts from the abrasion that would otherwise wear them, so the pump keeps its performance and the maintenance concentrates on the wetted valves and the membrane itself.
Piston slurry pumps
A piston slurry pump displaces slurry with a piston, delivering high pressure and strong efficiency for demanding transfer duties. Where a membrane pump isolates the drive, a piston pump uses wear parts in the fluid path selected to take the abrasion. Piston designs suit applications that need very high discharge pressure or long-distance slurry transfer, and like all positive displacement pumps their flow stays largely constant as the pressure rises.
Membrane versus piston at a glance
| Factor | Membrane slurry pump | Piston slurry pump |
|---|---|---|
| Drive and slurry contact | Membrane isolates the drive from the slurry | Wear parts in the fluid path take the abrasion |
| Pressure | High pressure with the drive protected | Very high pressure available |
| Primary wear parts | Membrane and valves | Piston wear parts, seals, and valves |
| Best fit | Abrasive slurry where isolating the drive pays off | High-pressure or long-distance slurry transfer |
Sizing and selection considerations
- Flow and pressure. Positive displacement flow holds largely constant as pressure rises, so high pressure and long transfer are natural fits.
- Solids concentration and particle size. Both drive wear-part selection and the valve design.
- Abrasiveness. The most abrasive slurries push the choice toward isolating the drive and toward harder wetted materials.
- Wear-part plan. Slurry pumps are built for scheduled wear-part replacement, so plan the maintenance interval into the selection.
Slurry pump lines available through Brabazon
For membrane and piston slurry duty we supply Abel pumps, selected for abrasive, high-solids slurry at high pressure across mining, minerals, and process applications.
Industries we serve
Service and failure considerations
With slurry pumps, wear is a design assumption rather than a surprise. Membranes, valves, seals, and wetted liners are scheduled replacement items, and tracking their wear prevents the unplanned failure that shuts a line down. Membrane pumps concentrate wear on the membrane and valves; piston pumps on the piston wear parts and valves. Keeping ahead of the wear schedule is what keeps the pump reliable. Our factory-trained technicians service slurry pumps through pump repair.
Slurry pump questions, answered first
What is a slurry pump and what makes it different?
A slurry pump is built to move a mixture of solids and liquid, so it is designed around abrasion and high solids content rather than clean-liquid efficiency. Membrane and piston slurry pumps are positive displacement designs that push thick, abrasive slurry to high pressure without the rapid impeller wear a centrifugal pump would suffer. The whole design assumes the fluid is punishing.
When should I choose a membrane slurry pump over a piston slurry pump?
Choose a membrane slurry pump when you want the pumped slurry kept off the moving drive parts, because a flexible membrane separates the slurry from the hydraulic or mechanical drive side. A piston slurry pump can offer very high pressure and efficiency where a piston can contact the fluid path with appropriate wear parts. The abrasiveness, pressure, and the value of isolating the drive from the slurry decide between them.
How do I size a slurry pump?
Size a slurry pump on the required flow, the discharge pressure including the effect of the solids, and the nature of the slurry itself: solids concentration, particle size, and abrasiveness. Positive displacement slurry pumps deliver flow largely independent of pressure, so high-pressure and long-distance transfer are where they excel. The wear parts and materials are then chosen for the specific abrasion the slurry causes.
What wears out on a slurry pump and how is it managed?
Wear parts such as valves, seals, membranes, and wetted liners take the abrasion and are treated as scheduled replacement items. Abrasive, high-solids slurry attacks any surface it touches, so slurry pumps are designed for straightforward wear-part replacement rather than a full rebuild each time. Tracking wear and replacing parts on a schedule keeps the pump running and avoids a failure that shuts the line down.
Size a slurry pump for your solids and pressure
Send us your flow, discharge pressure, solids concentration, and particle size and an engineer will size a membrane or piston slurry pump and quote it. We answer 24/7.
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