Rubber Lobe Pumps
Sludge Lobe Pump
The rubber lobe pump specified for sludge handling duty.
View specifications →Rubber Lobe Pumps
KRL Rubber Lobe Pump
A compact lobe pump with rubber covered rotors, built to pass lumps, fibre and hair instead of blocking on them.
Overview
What This Pump Does
The KRL rubber lobe pump is a positive displacement pump for wastewater, chemical and oil duty. The body can be cast iron or stainless steel and the rotors are covered with rubber, which is what lets the pump handle liquid carrying solids without damaging itself.
Large bucket geometry and a short passage through the pump give smooth transfer of the pumped fluid, and the pump can run reversed without restriction.
- Rubber covered lobe rotors
- Cast iron or stainless steel body
- Reversible operation without restriction
- Self priming to a maximum of 8.5 m
Key Benefits
What The Design Is Built Around
Compact For The Output
High performance in a compact design, taking between a quarter and two thirds of the floor area a normal screw pump needs.
Maintenance In Place
Wear parts are replaced in situ by service personnel without dismantling the piping or lifting the machine.
Does Not Block
Mixed gas, liquid, particles, big lumps, fibre and hair pass through the pump.
Strong Self Priming
Self priming capacity to a maximum of 8.5 metres, so the pump can draw from a sump below floor level.
Application Scenarios
Where It Is Installed
Wastewater Transfer
Moving screened sewage and sludge that would wrap around an impeller.
Chemical And Oil Duty
Transfer duties in chemical and oil service where solids are part of the liquid.
Gas Liquid Mixtures
Liquids carrying entrained gas that cause a centrifugal pump to lose prime.
Who It Is For
- Wastewater treatment works
- Industrial plants with solid laden effluent
- Chemical and oil operations
- Maintenance teams that service pumps in place
Problems It Solves
Downtime for pump maintenance
In place replacement of wear parts means a change fits inside a shutdown window instead of extending it.
Blockages on fibre and rag
The short wide flow path and reversible operation clear what would stop other pumps.
Not enough floor space
A far smaller footprint than a screw pump of similar output.
Technical Features
How It Is Built
- Rubber covered lobe rotors
- Cast iron or stainless steel body
- Reversible operation without restriction
- Self priming to a maximum of 8.5 m
- Separated sealing cavity kept wetted
- Wear parts replaceable in place
Specifications
Technical Data
Positive displacement pumps are sized on flow and differential pressure. Send both, plus the solids content of the liquid.
- Rubber covered lobe rotors
- Cast iron or stainless steel body
- Reversible operation without restriction
- Self priming to a maximum of 8.5 m
- Separated sealing cavity kept wetted
- Wear parts replaceable in place
Materials And Process
What Goes Into Every Unit
Materials
- Cast iron body for general duty
- Stainless steel body for corrosive service
- Rubber covered rotors
- Wear plates as replaceable items
Manufacturing And Assembly
- Body casting and machining
- Rotor covering and fitting
- Assembly and clearance setting
- Test and packing with documentation
Quality Control
- Rotor clearances set and checked
- Running test before dispatch
- Factory acceptance test record with the order
Customization Options
- Cast iron or stainless body
- Drive and speed to suit the duty
- Connection sizes and orientation
- Spare wear part sets supplied with the pump
Compared With Other Options
| Progressing cavity pump | The screw pump gives smoother flow at higher viscosity. The lobe pump takes far less space and its wear parts change faster. |
|---|---|
| Centrifugal sludge pump | A centrifugal pump is cheaper but blocks on rag and loses prime on gassy liquid. |
Use Guide
Installing And Servicing A Lobe Pump
Leave Cover Access
Plan space at the cover end so rotors and wear plates can be changed in place.
Protect Against Over Pressure
A positive displacement pump builds pressure against a closed valve, so fit relief or an interlock.
Check The Sealing Cavity
Keep the separated sealing cavity wetted as designed, since it protects the seal faces.
Change Wear Parts As A Set
Replace rotors and wear plates together so clearances stay correct.
Answers
KRL Rubber Lobe Pump FAQ
What can this pump handle?
Mixed gas, liquid and particles, including big lumps, fibre and hair, in wastewater, chemical and oil service.
How much suction lift?
Self priming capacity to a maximum of 8.5 metres, less on long or restricted suction lines.
Can it run in reverse?
Yes, operation is reversible without restriction, which is useful for clearing and emptying.
How is it maintained?
Wear parts are replaced in place without dismantling the piping or lifting the machine.
Which body material should I choose?
Cast iron for general sludge, stainless steel where the liquid is corrosive. Rotors are rubber covered in both cases.
Related Equipment
Related Equipment From The Same Line
Related positive displacement pumps and the treatment equipment they usually sit beside.
Progressing Cavity Pumps
SKPG Progressing Cavity Pump
Single screw pump for viscous media with or without solids.
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Sanitary Pumps
Rotary Lobe Pump
Sanitary lobe pump for viscous and shear sensitive product.
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Submersible Aerators And Mixers
SKCB Submersible Aerator
Self priming aerator combining pump blower and gas liquid mixer.
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Industries Guides And Solutions
Need KRL Rubber Lobe Pump Sized For Your Duty Point
Send the solids content, the flow and the differential pressure and we will size the pump and the spares.