Roots Pumping Stations
Roots pumping stations are the best solution for many industrial applications because they are robust and durable. They are reliable, require little maintenance, and can be configured to suit many process requirements.
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The appropriate pump principle in addition to the Roots
Roots pumping stations are the powerhouses among backing pumps: They offer a high pumping speed, especially in the transition range between rough and fine vacuum, i.e. in the range from atmosphere to around 10-3 hPa. The CombiLine product range includes various pumping technologies combined with at least one Roots pump. Our decades of experience in pumping station construction flow into this standardized series. If required, these pumping stations can be supplied with a magnetic coupling and are therefore hermetically sealed. These require little maintenance, and are suitable for use in potentially explosive environments or for evacuating explosive gases (ATEX).
Roots pumps (named after the inventors Francis and Philander Roots, who tested them in practice for the first time) are basically dry, i.e. oil-free, pumps that do not require any operating fluid in the work area. Except for gas circulation-cooled Roots pumps, which can compress against atmosphere, this type of pump requires a backing pump that reduces the pressure down to the working pressure of the Roots. Depending on whether the backing pump is dry or oil-sealed, the entire pumping station is also considered dry or oil-sealed.
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Brochure: CombiLine Roots pumping stations
Dry (oil-free) Roots pumping stations
For a dry pumping station, a dry backing pump is combined with the Roots pump. A screw pump from the COBRA series is usually used for this. Together with the new generation of HiLobe Roots pumps, it ensures a high pumping speed and, as a result, quick evacuation times. Alternatively, a conventional OktaLine Roots pump can be used.
Oil-lubricated Roots pumping stations
The combination of an oil-lubricated rotary vane pump with a Roots pump is the classic solution for low final pressures with high pumping speeds. Two different versions are used: With a single-stage backing pump R5 or UnoLine Plus, or with a two-stage DuoLine pump. The use of oil-sealed backing pumps is still the preferred solution for various industrial processes as it is the most robust and cheapest solution in terms of both acquisition and service life costs.
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Pumping stations with HiLobe Roots pumps
Features of pumping stations with frequency-controlled HiLobe Roots pumps
Assembled and piped together
Particularly suitable as a pre-pumping station for high vacuum pumps
Increased safety: Intelligent interface technology allows process monitoring (Industry 4.0)
Efficient: Shortest pump-out times thanks to the superior next-generation drive concept
Low operating costs: State-of-the-art motor technology (IE4 standard) and air cooling (up to +40 °C)
As an option, each pumping station is also available with a control cabinet and control, as well as with a ProfiNet interface
Thanks to the unique magnetic coupling of the DuoLine in combination with the hermetically sealed HiLobe series, permanently sealed pumping units are available, for example to pump valuable noble gases.
HiLobe and dry screw pump
Backing pump: COBRA
Pumping speed backing pump: 110 to 950 m3/h
Pumping speed pumping station: 959 - 5,098 m3/h (higher on request)
Final pressure: Up to 5 · 10-3 mbar
Suitable for quick evacuation of chambers and load lock applications
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HiLobe and single-stage rotary vane pump
Backing pump: R5 or UnoLine Plus
Pumping speed backing pump: 25 - 760 m3/h
Pumping speed pumping station: 1,028 - 4,689 m3/h (higher on request)
Final pressure: Up to 2 · 10-2 mbar
Solid pumping station with gas-independent pumping speed and long service life
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HiLobe and two-stage rotary vane pump
Backing pump: DuoLine
Pumping speed backing pump: 300 m3/h
Pumping speed pumping station: 975 - 2,037 m3/h (higher on request)
Final pressure: Up to 1 · 10-3 mbar
Suitable for achieving low final pressures
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Pumping stations with OktaLine Roots pumps
Features of pumping stations with conventional OktaLine Roots pumps
In addition to pumping station combinations with the HiLobe, Roots pumping stations based on conventional Roots pumps are also available, especially for lower pumping speeds (and customer-specific Roots pumping stations for special requirements). Instead of the HiLobe, a pump from the OktaLine series is used.
Assembled and piped together on a sturdy common frame
Each pumping station is also optionally available with a control cabinet and PLC
All motors comply with efficiency class IE3
Thanks to the unique magnetic couplings of the OktaLine and DuoLine, permanently sealed pumping stations are available, for example to pump valuable noble gases
OktaLine and dry screw pump
Backing pump: COBRA
Pumping speed backing pump: 110 to 320 m3/h
Pumping speed pumping station: 450 - 1,800 m3/h (higher on request)
Final pressure: Up to 2 · 10-3 mbar
These pumping stations use oil-free backing pumps, allowing for the pumping of reactive media without oil contamination, making them highly compatible with various processes.
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OktaLine and single-stage rotary vane pump
Backing pump: R5 or UnoLine Plus
Pumping speed backing pump: 25 - 760 m3/h
Pumping speed pumping station: 230 - 1,900 m3/h at 50 Hz, 280 - 2,200 m3/h at 60 Hz (higher on request)
Final pressure: Up to 2 · 10-2 mbar
Quick evacuation of (lock) chambers
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OktaLine and two-stage rotary vane pump
Backing pump: DuoLine
Pumping speed backing pump: 300 m3/h
Pumping speed pumping station: 220 - 1,800 m3/h at 50 Hz, 260 - 2,160 m3/h at 60 Hz (higher on request)
Final pressure: Up to 5 · 10-4 mbar
Classic pre-pumping station for high vacuum pumps, used for coating and in metallurgy
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Pumping station control and accessories for Roots pumping stations
Although CombiLine pumping stations are basically standardized, they can still be configured to suit the application: For example, the electronics for a HiLobe can be mounted either in a separate small cabinet on the frame or on mounting plates that can be integrated into a larger cabinet. Depending on weight and accessibility, pumping stations can be supplied on adjustable feet or castors. And, of course, all the accessories available for the individual pumps will fit, even when the pumps are installed in a network to form a Roots pumping station.
Details about the pumping station control can be found in the CombiLine brochure and also in the operating instructions. A little tip: An OmniControl mobile device with a large 3.5" touch display is very practical and intuitive to use for commissioning and generally reading out error codes.
You will find suitable accessories among the products in the shop, or on request we will recommend them according to your application.
Oil sump
Swivel castors / machine feet
Color variants
Valve in front of the pumping station
Measuring device in before the pumping station
Measuring device between the pump stages
Electric cabinet with control
ProfiNet interface
Spraying lance
Barrier gas
Oil filter (mechanical / chemical)
and much more
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OmniControl mobile device
FAQ (frequently asked questions)
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Do you already know our Vacuum Calculator?
Do you operate a CombiLine Roots pumping station and would like to know which alternative pumps or pump combinations can be used for a comparable evacuation performance? Either you contact your contact person or you can try out our Vacuum Calculator: It can not only make new designs but also guides you through the comparison step by step; a pre-selection of the well-known CombiLine pumping station makes data entry easier. In addition to the suitable products, you can view curves and get an initial cost indication. You can also send the information you have entered directly to us as an inquiry. We will then look at your entries in detail and contact you personally.
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