DuraCirc®

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Our dedicated Global Service Network supports you with parts and expertise, wherever you are, whenever you need it. By ensuring greater uptime, availability and optimization, we help bring you peace of mind, and maximize your return on investment. We can work with you to integrate our services into an Alfa Laval Service Agreement for predictable and worry-free operations.

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Engineered for durability, reliability and efficiency to extend the boundaries of your performance

Supreme Performance

Designed with close pump head clearances, the DuraCirc® circumferential piston pump(CPP) maximizes volumetric efficiency and process yield. Thirteen models offer a wide performance envelope with a flow rate capability up to 150 m³/hr (660 gpm) and operating pressures up to 40 bar (580 psi). This makes optimal pump sizing and selection easy, thereby reducing capital costs and increasing process flexibility.

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
• An optional retrofit port, the DuraCirc® Uni-Fit, enabling easy, direct replacement of existing circumferential piston pumps from both Alfa Laval and other brands, without requiring pipework modification in existing process systems

Safely meets industry hygienic demands, assuring  the integrity of your processes and
the quality of your products

Superior hygiene

The all-stainless-steel DuraCirc® circumferential piston pump is certified to meet global standards for hygienic design, including EHEDG and 3-A. In contrast to many other circumferential piston pump brands, the DuraCirc® provides both excellent cleanability and high volumetric efficiency.

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
• A robust gearcase with optimally positioned heavy-duty bearings that support large diameter shafts, which minimize pump-head contact, thereby reducing the risk of media contamination
• 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

Innovative design features make maintenance faster and easier, increasing uptime in your operations

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:

• A truly front-loading, self-setting, single mechanical seal for fast, in-situ seal replacement, without having to remove the pump from the process line
• Quick, easy replacement of rotors or rotor case in the unlikely event replacement is required
• Easy-to-access, external shimming outside the rotorcase 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

How does the DuraCirc® circumferential piston pump work

The DuraCirc® construction features two rotors, housed within a pumping chamber, known as a rotorcase, with each rotor located on a shaft held rigidly within a gearcase. The two rotors are timed via timing gears in the gearcase, which along with shimming, ensures no rotor or rotor case contact. Rotor/shaft drive is typicially 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 of the discharge port of the circumferential piston pump.