Conical Screw Flights for Decanter Centrifuge

Conical screw flights for decanter centrifuge – 39352 developed and manufactured by BEMA.

Conical screw flights are a critical component in any decanter centrifuge, where precise geometry, correct pitch, and high material strength are essential for a stable and efficient separation process. At BEMA, we specialise in manufacturing OEM screw flights produced precisely according to the customer’s own drawings and tolerance specifications. Our expertise lies in delivering conical screw segments with high repeatability, ensuring that each delivery matches the customer’s design and requirements 1:1.

The customer’s technical challenge

Manufacturers of decanter centrifuges work with complex geometries, where even small deviations in pitch, cone angle, wall thickness, or roundness can affect centrifuge performance. A decanter relies on stable and controlled material flow, which requires screw flights manufactured with extreme precision.

The customer’s challenge is therefore not only to receive a conical screw flight, but to receive a component that precisely matches the geometry they have specified. This applies both to new designs and to replacement of existing screw flights, where tolerances must be identical to ensure correct function and minimal post-processing.

Typical customer requirements include:

• Variable or constant pitch
• Defined cone angle and length profile
• Tight tolerances on wall thickness, diameter, and roundness
• Controlled segment construction
• Precise fit to centre shaft and inlet design

For customers in the process industry, it is crucial that screw flights can be produced with high reproducibility, ensuring that each series meets the same technical specifications.

Read more about BEMA’s screw flights here

BEMA’s technical solution for conical screw segments

BEMA has many years of experience in manufacturing conical screw flights for decanter centrifuges. We work directly from the customer’s CAD files, drawings, and tolerance specifications, ensuring that all critical dimensions are met. Our role as an OEM supplier is to manufacture the segments with the accuracy required for the customer to perform welding, balancing, and final assembly without adjustments.

See a similar example of conical screw flights here

Precision manufacturing of conical screw segments

At BEMA, our core competence lies in producing conical screw segments that precisely match the customer’s drawings. We manufacture the segments in the exact geometry specified by the customer, allowing them to be welded and assembled into the decanter centrifuge without the need for adjustment.

Our production includes:

• CNC-controlled forming of segments based on customer CAD data
• Precise control of pitch, cone angle, and wall thickness
• Measurement and verification of critical dimensions to ensure a 1:1 fit with the customer’s design
• Testing and visual inspection in the workshop, as documented in the images on the page
• Consistency across production batches, ensuring the customer’s welding process can be carried out without variation

Since the customer is responsible for welding and balancing, it is essential that BEMA delivers segments with high repeatability. This ensures an efficient assembly process and a stable final component.

Materials and wear resistance for conical screw segments

We manufacture conical screw flights in:

• High-strength steels such as Hardox and Creusabro
• Stainless steel grades such as 1.4301, 1.4401, 1.4436, etc.
• Materials with wear-resistant coatings or hardfacing

The material selection depends on the customer’s process, media, and service life requirements.

The result

The customer receives a conical screw flight that:

• Matches their geometry with high precision
• Reduces assembly and welding time, as segments fit precisely without adjustment
• Minimises the need for post-processing
• Delivers consistent OEM quality in every production batch

Conclusion

BEMA is a reliable OEM partner for manufacturers of decanter centrifuges requiring precise and reproducible conical screw flights. Our combination of technical expertise, modern production technology, and focus on repeatability enables us to deliver components that support high performance and long service life in the customer’s process equipment.

FAQ – How BEMA supports you as an OEM supplier of conical screw flights

How does BEMA convert our CAD drawings into finished screw flights?

BEMA works directly from the customer’s CAD files and tolerance specifications. We transform the drawings into precisely formed conical screw segments, where pitch, cone angle, and wall thickness follow the customer’s specifications 1:1. This ensures that the segments fit perfectly into the customer’s decanter design.

How does BEMA ensure high repeatability in production?

We use CNC-controlled forming and fixed process parameters, enabling us to reproduce segments with extreme accuracy across production batches. This ensures consistent geometry and quality every time.

What quality control does BEMA perform before delivery?

All segments undergo visual inspection and testing in the workshop, where we verify critical dimensions such as pitch, diameter, and cone angle. This ensures that the segments are ready for the customer’s welding and assembly without adjustment.

How does BEMA help reduce assembly and welding time?

Because the segments are manufactured with high precision and consistency, the customer can weld and assemble them much more efficiently. The precise fit reduces time consumption, minimises errors, and ensures a faster and more stable assembly process.