New Alfa Laval DuraCirc® Circumferential Piston Pump combines efficiency with ease of cleaning and service
Do you feel stuck choosing between an efficient pump or a pump that’s easy to clean and service? Not anymore! The new Alfa Laval DuraCirc® Circumferential Piston Pump (CPP) saves you from making the difficult choice and instead gives you both results!
The new design of the DuraCirc ensures efficient performance that meets superior hygiene standards (EHEDG and 3-A) and enables simpler service — featuring a front-loading single mechanical seal that enables quick and easy inspection or replacement without the need to disassemble pipework.
The Circumferential Piston Pump consists of two positive displacement rotors designed for transporting very low viscosity products at a range of discharge pressures in food, dairy, beverage, and pharmaceutical applications.
Known for its energy efficiency, gentle product handling, and the ability to maintain consistent flow rates despite fluctuating head pressures, DuraCirc is available with 13 different pump head displacements to handle flow rates up to 656 US gpm and differential pressures up to 580 PSI.
The combination of lower and easier maintenance combined with true cleanability is proving to be the exact formula that makes this a game changer and customers are agreeing
~ Russell Jones, Commercial Sales Manager - Pumps, Alfa Laval
Key Benefits
- DuraCirc rotors operate at high efficiency
- Hi Life Rotor option eliminates contact with casing, prolonging pump life and reducing risk of metallic contamination of your product
- Certified EHEDG and 3-A
- Reduces process contamination risk
- Reduces Clean-in-place (CIP) cycle time
- Strong gearcase, increased-diameter shafts for increased durability
- Heavy-duty bearings extend reliable operation
- Pressure up to 580 psi
- Only one rotor size covers temperature from -4°F to 390°F
Standard design
Twin-wing Hi-Life piston rotors made of special non-galling alloy are standard in DuraCirc. All other media-contacting steel components, like the rotor case, front cover, and rotor nuts, are in AISI 316L. The DuraCirc pump comes standard with an all stainless steel exterior for high corrosion resistance.
The gearbox comes standard with duplex shafts and a strong, long-life bearing arrangement for efficiency at high volumes.
DuraCirc meets stringent hygienic design standards for effective CIP cleanability.
How the DuraCirc Works
Circumferential Piston pumps transfer fluid by capturing and moving specific volumes from the pump inlet to the pump outlet using rotational mechanical force. Rotor pistons are driven independently on rotating shafts. The rotors are timed to create a low-pressure cavity at the inlet side that helps introduce fluid into the pump. The fluid is transported around the channel by the rotor pistons and is displaced as the rotor pistons re-mesh, generating pressure at the discharge port. The direction of flow is reversible.
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Unlike kinetic pumps that accelerate fluid to generate flow and pressure, CPPs transfer product by physically forcing fluid through the pump outlet.
The rotors in a CPP rotate in a close-fitting housing without ever contacting each other. Large cavities between the rotors and the non-contacting design means gentle handling of thin and viscous fluids and fluids containing large solids.
Available in two orientations
To make the DuraCirc adaptable to application space requirements, it’s available in vertical and horizontal orientations and an optional rectangular inlet option for high-viscosity fluids.
Options
- 13 models to choose fro
- Up to Silicon Carbide/Silicon Carbide mechanical seal faces
- Single mechanical shaft seal with flush
- Double mechanical shaft seal
- EDPM or FPM O-ring seal, single and flushed
- Product wetted elastomers in FPM or FFPM
- High efficiency Hi-Flow rotor
- Horizontal or vertical porting
- Heating and cooling jacket
- Rectangular inlet
- Aseptic option
Pump sizing
Correctly sizing a circumferential piston pump depends on several application-specific factors. Pump representatives need the following information to select the right pump for the application.
Product/Fluid Data
1. Fluid to be pumped: Some liquids change viscosity when under pressure, such as when they come in contact with a rotor inside a pump. Some liquids become less viscous with increased force, while others become more viscous.
2. Fluid viscosity: Positive displacement pumps deliver a constant flow of fluid at a given pump speed. However, when viscosity increases, resistance to flow increases, so to maintain system flow at higher viscosities, pumps may require more horsepower.
3. Pumping temperature: minimum, normal, and maximum. Temperature-sensitive fluids change their flow properties when temperature changes, so knowing processing temperatures helps with pump selection. Temperature can affect product viscosity.
4. Cleaning in Place temperature(s): minimum, normal, and maximum.
Performance Data
1. Flow rate: minimum, normal, and maximum. The pump you choose determines the flow rates you can achieve under system operating conditions. Flow rate is the volume of fluid moved by the pump in a given time frame, as measured, for example, in gallons per minute or liters per second.
For example, a pump that moves 32 gallons of fluid every minute has a flow rate of 32 GPM.
2. Discharge head/pressure (closest to pump outlet): Once the fluid is in the pump, the pump’s mechanical action creates pressure to move fluids through the outlet side of the pump where the fluid now must overcome pressure created by gravity and system components on that side of the system. The difference between inlet and outlet pressure is the pressure differential.
3. Suction condition at pump inlet: All pumps have minimum pressure requirements at their inlets to work properly. The technical phrase for the minimum requirement is Net Positive Suction Head required (NPSHr). The Net Positive Suction Head available (NSPHa) at the pump inlet must always be greater than the Net Positive Suction Head required (NPSHr) to avoid cavitation, or the formation of vapor filled bubbles that can rapidly expand and collapse causing damage to the pump and process piping.
Net Positive Suction Head Available (NPSHa) is determined by the process piping. You always want NPSHa to be greater than NPSHr. The lower the speed of a PD pump, the lower the NPSHr.
For more information about pump sizing, read Top 5 Things to Know to Properly Size a Pump.
DuraCirc Technical Data
Standard specification
- Piston rotors: DuraCirc Hi-Life, Non-Galling Alloy
- Other product wetted steel parts: W. 1.4404 (316L)
- Inside surface finish: Mech Ra ≤ 0.8
- Shafts: Duplex 1.4460 (329)
- Gear box: Stainless steel
- Base plate: Stainless steel
- Coupling guard: Stainless steel
- Product wetted elastomers: EPDM
- Other elastomers: FPM
- Shaft seal: Single mechanical
- Rotary seal face: Silicon Carbide
- Stationary seal face: Carbon
Additional Features
DuraCirc performance
1. Lower cavitation risk
The DuraCirc Port and pump-head geometry achieves a very low NPSHr, to reduce cavitation risk.
2. Bearings
Long-life, heavy-duty bearings in a solid stainless steel gearcase reduce shaft movement and allow close pump-head clearances to minimize pump-head contact. A modular seal design makes seal conversion easy without requiring re-machining or additional flush housings. Single oil lubrication system significantly increases time between oil changes and elimination of weekly regreasing of individual bearings.
Optional retrofit port: 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 systems
Servicing DuraCirc
Servicing is more straightforward in 6 key ways:
- You can replace the front-loading single seal quickly without removing the pump from the processing line.
- A single gearbox lubricant with extended service life maintains continuous operation.
- Refitting rotors is easy because the splines ensure correct placement.
- Long-life bearings decrease maintenance frequency
- Factory set timing and shimming make gearbox rebuilds unnecessary when changing key components
- Wetted parts are interchangeable without complex rebuild procedures
Condition monitoring
Condition monitoring (CM) tracks the operating condition of rotating equipment in the pump. A sensor in the monitor measures vibration and alerts operators through a visible LED indicator on the monitor and on any connected mobile device within range if preset thresholds are exceeded.
The CM collects and analyzes data from rotors, recording deviations from benchmark performance. With the data, an operator can make fast, accurate decisions and schedule maintenance accordingly, preventing potential problems before they occur.
13 DuraCirc models
DuraCirc flow rates can reach up to 660 GPM at differential pressures up to 580 PSI.
Process data |
Displacement |
Inlet/Outlet |
Diff. Pressure |
Max speed |
||||
Pump Model |
Litres/rev |
Imp gall/100 rev |
US gall/100 rev |
MM |
Inch |
Bar |
PSI |
RPM |
32 |
0,03 |
0.66 |
0.79 |
25 |
1 |
25 |
362 |
1000 |
33 |
0,06 |
1.32 |
1.58 |
40 |
1½ |
25 |
362 |
1000 |
34 |
0,12 |
2.64 |
3.17 |
50 |
2 |
16 |
232 |
1000 |
42 |
0,23 |
5.06 |
6.07 |
50 |
2 |
20 |
290 |
750 |
43 |
0,29 |
6.38 |
7.66 |
50 |
2 |
13 |
188 |
750 |
52 |
0,38 |
8.36 |
10.03 |
50 |
2 |
37 |
536 |
750 |
53 |
0,59 |
12.97 |
15.57 |
65 |
2½ |
25 |
362 |
750 |
54 |
0,96 |
21.12 |
25.3 |
80 |
3 |
16 |
232 |
750 |
62 |
1,44 |
31.67 |
38.04 |
80 |
3 |
37 |
536 |
600 |
63 |
1,97 |
43.33 |
52.03 |
100 |
4 |
25 |
362 |
600 |
72 |
1,92 |
42.23 |
50.7 |
100 |
4 |
40 |
580 |
600 |
73 |
2,86 |
62.91 |
75.55 |
150 |
6 |
25 |
362 |
600 |
74 |
4,14 |
91.1 |
109.4 |
150 |
6 |
16 |
232 |
600 |
Five Aseptic DuraCirc models
DuraCirc Aseptic is designed for high volumetric efficiency and ease of service in aseptic processing in the dairy, food, and beverage industries, especially for packaging requiring extended shelf life. Aseptic models reach flow rates up to 103 m3/h (453 gpm) and pressures up to 25 bar (363 psi).
Benefits of the aseptic version include the use of a steam barrier on the front cover, ports, and mechanical seals for sterile pump operation. EHEDG and 3-A certifications mean reduced process cross-contamination risk and CIP cycle time. Includes the same simple component interchangeability, long-life bearings, and single long-life lubricant as the standard model.
A Guide to Choosing the Right Pump for Hygienic Applications
This guide is intended for engineers, production managers, or anyone concerned with proper pump selection for pharmaceutical, biotechnology, and other ultra-clean applications.
Next Steps
As you've seen, the revolutionary Alfa Laval DuraCirc® is the first circumferential piston pump that delivers the perfect balance of high efficiency, durability, reliability, and superior hygienic performance. Combined that with a broad range of pressures and flow rates — along with capabilities for simple service — and the DuraCirc keeps your processes up and running.
To speak with a pump expert today about the DuraCirc, give us a call at 417-831-1411 or click the link below.
ABOUT CSI
Central States Industrial Equipment (CSI) is a leader in distribution of hygienic pipe, valves, fittings, pumps, heat exchangers, and MRO supplies for hygienic industrial processors, with four distribution facilities across the U.S. CSI also provides detail design and execution for hygienic process systems in the food, dairy, beverage, pharmaceutical, biotechnology, and personal care industries. Specializing in process piping, system start-ups, and cleaning systems, CSI leverages technology, intellectual property, and industry expertise to deliver solutions to processing problems. More information can be found at www.csidesigns.com.