Engineering & Manufacturing
The service life of a pump is decided at the design table, not on the assembly line. At Profimann, design decisions are taken together with manufacturing capability.
A lobe pump is a machine governed by tight tolerances. The clearance between rotor and casing determines volumetric efficiency, and the accuracy of the rotor profile determines shear and pulsation. Design and machining are therefore never considered separately.
The engineering foundation of the company rests on design practice acquired at American and German engineering companies. That practice shows up concretely in how tolerance chains are built, how wear parts are separated out, and how service access is planned at the start of the design rather than at the end.
From design to service
Design and calculation
Volumetric calculation, tolerance chain, shaft and bearing sizing, materials compatibility assessment.
Machining
Casing, cover, rotor and shaft set machined to tight tolerances, with wear surfaces produced as separate parts.
Assembly and test
Rotor clearance setting, timing gearbox assembly, leak testing and running tests.
Field support
Commissioning, duty point verification, maintenance planning and spare-part continuity.
How a rotary lobe pump works
A positive displacement principle. Two rotors that never touch carry the fluid in cells between themselves and the casing.
Synchronised drive
The rotors are synchronised through a gearbox and counter-rotate without touching. There is no metal-to-metal contact.
Suction
As the rotors separate, the volume at the suction port expands and the resulting pressure difference draws the fluid into the casing.
Transport
The fluid is carried to the discharge side in the cells between rotor and casing. Wide passages keep shear low.
Discharge
As the rotors mesh again the cell closes and the fluid is delivered to the line. Flow is proportional to shaft speed.
How a pump is selected
A correct selection starts from process data, not from reading a model off a catalogue page. The four items below are enough to determine the frame size and the configuration.
The fluid
Chemical content, solids ratio, particle size and shear sensitivity. This decides the material and the rotor choice.
Viscosity and temperature
Viscosity at running temperature and at cold start are both needed. Drive torque is calculated from the two.
Flow and pressure
The required flow and the differential pressure of the line together set the frame size and the operating speed.
Duty regime
Continuous or intermittent running, any CIP or SIP requirement and the suction conditions determine the seal and the connection type.
Let us determine the right pump for your application together.
Share your fluid characteristics and operating conditions, and our engineering team will help you arrive at the right Liquilob configuration.