Aseptic Sanitary Centrifugal Pump (Sterile) for Pharmaceutical and Sterile Zone Applications

A sanitary/hygienic pump already meets hygienic requirements: AISI 316L body, product-contact surfaces polished to a surface roughness Ra typically ≤0.8µm to minimize bacterial adhesion, no dead zones, full self-draining, and quick-disconnect fittings. This level is suitable for most F&B production lines.

An aseptic (sterile) pump goes one step further. In the sterile zones of pharmaceutical and biotechnology processes, not only must the pumped fluid be clean — the boundary between the fluid and the external environment must also be controlled. Aseptic pumps therefore focus on the seal assembly: an aseptic seal with a barrier chamber prevents microorganisms from entering along the pump shaft, combined with thorough CIP/SIP cleaning and sterilization capability without disassembling the pump.

Within CSF Inox’s sanitary centrifugal pump lineup, the CS family forms the foundation: single-stage centrifugal pump, AISI 316L body, polished surfaces, and sanitary connections. Building on this same platform, CSF Inox developed two variants within the same family: CSK as the aseptic version for sterile zones and CSD as an additional variant in the same group.

A key advantage of the CSK sharing its platform with the CS is consistency in hydraulics and spare parts: the same dead-zone-free, self-draining design philosophy and the same quick-disconnect fitting system, allowing facilities to standardize maintenance procedures across hygienic and aseptic areas within the same plant. The critical difference lies in the aseptic seal assembly fitted to the CSK to meet sterile zone requirements.

This core sanitary centrifugal pump family (CS/CSK/CSD) covers a broad range, with flow rates up to 500 m³/h, head up to 100 m, and pressure up to 10 bar, across multiple frame sizes. For sterile zone applications specifically, parameters are selected according to the actual flow rate and head requirements of each process step, so CSK configurations typically fall in the flow rate and head range suited to pharmaceutical or biotechnology batch production scales rather than exploiting the full maximum range of the entire family.

CIP (Clean-In-Place) means in-place cleaning: cleaning solution is circulated through the piping and pump without dismantling the equipment. SIP (Sterilization-In-Place) means in-place sterilization, typically using steam to destroy residual microorganisms. In sterile zones, every time the pump is disassembled there is a risk of recontamination, so thorough CIP/SIP capability is a mandatory requirement for aseptic pumps.

For effective CIP/SIP, the pump construction must have no dead zones (areas the solution cannot reach), surfaces must be sufficiently smooth to prevent biofilm retention, and the entire pump chamber must fully self-drain when stopped. The CSK’s aseptic seal assembly is designed to withstand the thermal cycles of SIP and to allow CIP solution access to critical surfaces. This enables operating facilities to reduce downtime between batches and maintain the sterile integrity of the production line.

Sanitary centrifugal pumps, including the aseptic version, are suitable for low-viscosity fluids requiring high flow rates and moderate head. To make the right selection, answer the following questions in sequence:

For biological fluids sensitive to shear force or containing cellular components, a high-speed centrifugal pump may not be the appropriate choice — in such cases, consult with the engineering team to evaluate positive displacement options within the same CSF Inox system. Configuration finalization should be based on actual operating parameters rather than solely on the maximum range of the product series.