The Alfa Laval DuraCirc® is revolutionary circumferential piston pump that delivers the perfect balance of durability, reliability, high efficiency and superior hygienic performance. Combined with a broad range of flow rates and pressures along with capabilities for simple service, the DuraCirc comes with globally recognized hygienic certification. The innovative design also includes features that make cleaning and maintenance faster, easier and more dependable.
The pump performance, hygienic design and ease of service are essential to hygienic processes. Yet manufacturers in the dairy, food, beverage, confectionery, and home-personal care industries must often sacrifice one essential to achieve another. But with the Alfa Laval DuraCirc® circumferential piston pump (CPP) is able to deliver it all – high volumetric efficiency, EHEDG, and 3-A conformance, and quick-and-easy service.
For a cost-effective pump selection offering a broad range application scope, the range consists of 13 models, capable of flow rates up to 150m³/hr (660 gpm) and pressures of 40 bar (580 psi)
Simplified service in terms of complexity and time with user-friendly features including a truly front-loading, self-setting single mechanical seal, use of a single long-life oil lubricant, and external shimming.
Applications
Designed for Cleaning-In-Place (CIP), the Alfa Laval DuraCirc is ideal for hygienic applications within the dairy, food, beverage, home and personal care industries. The highly efficient design is particularly suited to applications that are low in viscosity with medium to high discharge pressures and require equipment that can be cleaned in place.
The DuraCirc Circumferential Piston Pump is available with 13 different pump head displacements to handle flow rates up to 149 m³/h and differential pressures up to 40 bar.
Standard Design
Twin-wing piston rotors made of special non-galling alloy are standard. All other media contacting steel components, like the rotor case, front cover and rotor nuts are in W.14404 (AISI 316L). With stainless steel gear case and feet, the DuraCirc pump has an all stainless steel exterior, making it exceptional corrosion resistant.
The gearbox is as standard designed with duplex shafts and a strong, long life bearing arrangement. This provides for a very robust and rigid shaft assembly design – a prerequisite for the very high volumetric efficiency achieved.
With profiled defined compression elastomers and optimized shaft seal location, the DuraCirc is designed according to the most stringent hygienic design standards and with verified and effective CIP cleanability.
The pump features a front-loading single mechanical seal, which allows quick and easy inspection or replacement without the need to disassemble pipework. Single flushed and double mechanical shaft seals as well as O-ring seals are available as options.
The Alfa Laval DuraCirc can be supplied with either as a bare shaft pump or mounted on a base plate complete with coupling guard, gear motor and shroud for easy, plug-and-play installation.
Benefits
- High volumetric efficiency performance allowing for optimized pump selection, reduce capital costs, whilst improving yield.
- Certified to bath 3A and EHEDG, reducing both process cross-contamination risk and CIP cleaning time, maintaining process yield as well as cutting costs.
- Truly front-loading single seal, full component, interchangeability without complicated maintenance procedures, long life bearing operation and one single long life lubricant making service faster and easier, increasing processing uptime.
- Robust, durable design via strong gearcase incorporating increased diameter shafts and optimally positioned heavy-duty bearings, minimizes risk of pump head contact, reducing service requirement, maintaining process continuity.
- DuraCirc Uni-Fit port option allows easy direct replacement of both Alfa Laval SCPP range and also other major brands into existing process systems, without changing pipework.
Supreme Performance
Based on a robust, reliable design, DuraCirc® features include;
- Advanced port and pump head geometry, providing a very low NPSHr characteristic. This significantly reduces cavitation risk and maintains pump and media integrity whilst increasing process flexibility in challenging applications.
- Long-life, heavy-duty bearings, supporting rigid shafts located in a solid stainless steel gearcase, which reduce shaft movement and allow close pump-head clearances. This minimizes pump-head contact and ensures process uptime.
- A modular seal design, which makes seal conversion easy without requiring re-machining or additional flush housings, should the process application change.
Superior Performance
Based on a robust, reliable design, DuraCirc® features include;
- Advanced port and pump head geometry, providing a very low NPSHr characteristic. This significantly reduces cavitation risk and maintains pump and media integrity whilst increasing process flexibility in challenging applications.
- Long-life, heavy duty bearings, supporting rigid shafts located in a solid stainless steel gearcase, which reduce shaft movement and allow close pump-head clearance. This minimizes pump-head contact and ensures process uptime.
- A modular seal design, which makes seal conversion easy without requiring re-machining or additional flush housings, should the process application change.
Superior hygiene
The DuraCirc® circumferential piston pump is certified to meet global standards for hygienic design, including EHEDG or 3-A.
Features that reduce the risk of contamination include;
- Profiled, product-wetted elastomers that are FDA-compliant and have a defined compression, thereby eliminating crevices and dead zones.
- An all stainless steel construction suitable for hygienic washdown, ensuring a cleaner environment.
- Long-lasting, FDA-compliant gearbox lubricant.
- Optimized seal design with faces fully immersed in the pumped media for higher cleaning efficiency.
Simpler Service
Increase process uptime and make service faster and easier with innovative DuraCirc® design features. Perform standard maintenance procedures quickly and simply, without requiring gearbox disassembly, component re-work, or complex pump re-build procedures. Features include;
- Quick, easy replacement of rotors or rotor case in the unlikely even replacement is required.
- Easy-to-access, external shimming outside the rotor case instead of inside the gearbox.
- Fully interchangeable spare parts
- Long-life bearings, offering tens of thousands of hours of operation
- A single, long-life FDA-approved gearbox lubricant with an extended 3,000-hour change interval.
The DuraCirc® construction features two rotors, housed within a pumping chamber, known as a rotor case, with each rotor located on a shaft held rigidly within a gearcase, which along with shimming, ensures no rotor or rotor case contact. Rotor/shaft drive is typically provided via geared electric motor.
Due to the close internal running clearance within the pumping chamber, the rotation of the rotors continuously generates a partial vacuum in the suction port of the pump as the rotors unmesh. This results in a localized pressure drop, which allows fluid to enter the pump. The fluid is then transported around the channel by the rotor wings; the pressure generated as the rotor wings re-mesh forces the fluid out to discharge port of the circumferential piston pump. The direction of the flow is reversible.
