Three-screw Pumps
Allweiler® and IMO®. The world's most trusted three-screw pumps.
Built with quality parts and unmatched expertise, our pumps deliver a level of reliability
that's made them an industry standard.
Our reputation is over 90 years strong.
For nearly a century, companies like yours have depended on our pumps for increased uptime, less hassle and a lower cost of ownership.
Three-Screw Solutions You Can Count On.
We offer a wide range of three-screw pumps to fit your specific needs.
ALLWEILER ALLFUEL Series
SPECS
- Maximum discharge pressure: 40 bar/580 PSIG
- Maximum flow rate: 29 GPM / 112 l/min
- Viscosity: 1 – 750 mm2/s
- Maximum fluid temperature: 150°C/302°F
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Innovative design allows you to maintain, repair and upgrade pump in a fraction of time
- One ball bearing design and one mechanical seal for all pump sizes
- Redesigned split pump foot allows you to disassemble on site
- Used in oil firing, marine, tank farming and industrial applications
To get product details, case studies and more information on the CIRCOR ALLFUEL Series pump, click the button below.
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ALLWEILER SM Series
SPECS
- Maximum discharge pressure: 120 bar/1,740 PSIG
- Maximum flow rate: 581 GPM / 2,200 l/min
- Viscosity: 1 – 5,000 mm2/s
- Maximum fluid temperature: 200°C/392°F
- Vertical and horizontal installation
- Dry Installation
- In-tank installation
BENEFITS
- Self-priming
- Base plate design accommodates bulkhead or pedestal mounting
- Best suited for firing or hydraulic applications
- Handles chemically neutral, lubricating liquids like fuel, lube, hydraulic, coolant and cooling oils
ALLWEILER SN Series
SPECS
- Maximum discharge pressure: 64 bar/928 PSIG
- Maximum flow rate: 1,400 GPM / 5,300 l/min
- Viscosity: 1 – 5,000 mm2/s
- Maximum fluid temperature: 150°C/302°F
- Vertical and horizontal installation
- Dry installation
- In-tank installation
BENEFITS
- Self-priming
- Used for firing, hydraulics, mechanical engineering, chemical, petrochemical marine, offshore engineering and general industrial applications
ALLWEILER Trilub TRL Series
SPECS
- Maximum discharge pressure: 16 bar/232 PSIG
- Maximum flow rate: 232 GPM / 880 l/min
- Viscosity: 3 – 760 mm2/s
- Maximum fluid temperature: 80°C/176°F
- Vertical and horizontal installation
- Dry Installation
- In-tank installation
BENEFITS
- Self-priming
- Designed to handle lube oils, hydraulic oils and light fuel oils that are free of abrasive components
- Can be pedestal or bulkhead mounted
- Best suited for oil-fired systems, hydraulic installations, mechanical engineering, general industrial technologies, chemical and petrochemical industries, as well as marine, offshore engineering and lube oil applications
IMO 3D Series
SPECS
- Maximum discharge pressure: 34 bar/500 PSIG
- Maximum flow rate: 400 GPM / 1,514 l/min
- Viscosity: 2 – 3,250 mm2/s
- Maximum fluid temperature: 121°C/250°F
- Vertical and horizontal installation
- Dry installation
- In-tank installation
BENEFITS
- Available in 19 different displacements
- Incorporates full hydraulic balance to negate axial and radial thrust loads
- Able to pump non-lubricating liquid
- Offers low noise, high efficiency and non-pulsating flow
- Suitable for lubrication services, fuel oil transfer and burner applications, elevator supply, coolants and other industrial uses
IMO 3E Series
SPECS
- Maximum discharge pressure: 10 bar/150 PSIG
- Maximum flow rate: 100 GPM / 379 l/min
- Viscosity: 2 – 5,400 mm2/s
- Maximum fluid temperature: 121°C/250°F
- Vertical and horizontal installation
- Dry installation
- In-tank installation
BENEFITS
- Designed for high-pressure lubrication
- Available in sixteen displacements across six frame sizes
- Delivers quiet, energy-efficient operation and the highest “Total Savings of Ownership”
- Suitable for rotating machinery and equipment where forced oil flow is required
IMO 3G Series
SPECS
- Maximum discharge pressure: 17 bar/250 PSIG
- Maximum flow rate: 200 GPM / 757 l/min
- Viscosity: 2 – 3,200 mm2/s
- Maximum fluid temperature: 107°C/225°F
- Vertical and horizontal installation
- Dry installation
- In-tank installation
BENEFITS
- Designed to decrease maintenance and increase intervals between service
- Reduces energy costs
- Available in 17 displacements fitted into five casting sizes
- Intended for use rotating machinery or other equipment needing forced lubrication, circulation or fluid transfer
- Flange or foot mounting available for all sizes
IMO 4SFC Series
SPECS
- Maximum discharge pressure: 100 bar/1,450 PSIG
- Maximum flow rate: 15 GPM / 57 l/min
- Viscosity: 1 – 2,000 mm2/s
- Maximum fluid temperature: 80°C/176°F
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Intended primarily as a medium pressure fluid pump
- Can be either foot or flange mounted in any attitude
- High tensile, close grain, cast iron casing
IMO 4T Series
SPECS
- Maximum discharge pressure: 103 bar/1,500 PSIG
- Maximum flow rate: 200 GPM / 757 l/min
- Viscosity: 2 – 3,200 mm2/s
- Maximum fluid temperature:
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Primarily used for medium pressure gas sealing applications on compressors
- Suitable for cyclic pressure service
- Can be either foot or flange mounted at any attitude
IMO 4VKC Series
SPECS
- Maximum discharge pressure: 80 bar/1,160 PSIG
- Maximum flow rate: 258 GPM / 978 l/min
- Viscosity: 1 – 2,000 mm2/s
- Maximum fluid temperature:
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Intended primarily as a medium pressure fluid pump
- Can be either foot or flange mounted in any attitude
- High tensile, close grain, cast iron casing
IMO 6D Series
SPECS
- Maximum discharge pressure: 103 bar/1,500 PSIG
- Maximum flow rate: 400 GPM / 1,514 l/min
- Viscosity: 4 – 5,400 mm2/s
- Maximum fluid temperature: 121°C/250°F
- Vertical and horizontal installation
- Dry installation
- In-tank installation
BENEFITS
- Intended for relatively high-pressure service on petroleum or similar viscosity liquids
- Hydraulically balanced in both axial and radial directions to eliminate bearing loads due to discharge pressure
- Inlet is rotatable in 90° increments for ease of piping
- Low noise, high efficiency, non-pulsating delivery
IMO 6U/6T Series
SPECS
- Maximum discharge pressure: 172 bar/2,500 PSIG
- Maximum flow rate: 200 GPM / 757 l/min
- Viscosity: 1 – 2,000 mm2/s
- Maximum fluid temperature: 80°C/176°F
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Delivers excellent suction performance over a wide range of viscosities
- Self-priming design features only three moving parts
- Easy to install and maintain
IMO 8L Series
SPECS
- Maximum discharge pressure: 138 bar/2,000 PSIG
- Maximum flow rate: 2,900 GPM / 10,978 l/min
- Viscosity: 10 – 5,400 mm2/s
- Maximum fluid temperature: 107°C/225°F
- Horizontal installation
- Dry installation
BENEFITS
- Built for pipeline transport in medium to high-pressure service on crude oils, fuel oils and other petroleum products
- Designed to operate consistently at over 80% efficiency and at lower operating costs than centrifugal pumps
- Able to handle wide range of fluids in a number of applications
IMO 12D Series
SPECS
- Maximum discharge pressure: 151 bar/2,200 PSIG
- Maximum flow rate: 400 GPM / 1,514 l/min
- Viscosity: 4 – 5,400 mm2/s
- Maximum fluid temperature: 107°C/225°F
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Intended for high-pressure service on fluids with viscosity from 33ssu to 25,000ssu
- Does not rely on lubrication qualities of pumped liquid
- Hydraulically balanced in both the axial and radial directions eliminating bearing loads due to differential pressure
IMO 12L Series
SPECS
- Maximum discharge pressure: 310 bar/4,500 PSIG
- Maximum flow rate: 100 GPM / 379 l/min
- Viscosity: 4-5,400 mm2/s
- Maximum fluid temperature:
- Horizontal installation
- Dry installation
BENEFITS
- The world standard for gas sealing services on high pressure centrifugal compressors
- Operating noise levels typically below 75 dBA at full pressure
- Features replaceable housings to make repairs simple
- Case hardened thread ground screw set provides long life
IMO C323F Series
SPECS
- Maximum discharge pressure: 21 – 34 bar/300 – 500 PSIG
- Maximum flow rate: 3,300 GPM / 12,500 l/min
- Viscosity: 11 – 43,200 mm2/s
- Maximum fluid temperature: 260°C/500°F
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Designed for transfer, fuel and lube applications
IMO C324A Series
SPECS
- Maximum discharge pressure: 34 bar/500 PSIG
- Maximum flow rate: 900 GPM / 3,400 l/min
- Viscosity: 11 – 43,200 mm2/s
- Maximum fluid temperature: 260°C/500°F
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Features replaceable housings to make repairs simple
- Case-hardened screw set provides long life
- Its double end design gives it inherent axial hydraulic balance
- Offers high flow range for its compact size
IMO T324N Series
SPECS
- Maximum discharge pressure: 34 bar/500 PSIG
- Maximum flow rate: 800 GPM / 3,033 l/min
- Viscosity: 11 – 43,200 mm2/s
- Maximum fluid temperature: 260°C/500°F
- Vertical and horizontal installation
- Dry installation
- Magnetic coupling
BENEFITS
- Delivers excellent suction capability over a wide range of fluid viscosities
- Simple design has only three moving parts
- Easy to install, maintain and repair
IMO UCF Series
SPECS
- Maximum discharge pressure: 16 bar/232 PSIG
- Maximum flow rate: 763 GPM / 2,900 l/min
- Viscosity: 1.4 – 5,00 mm2/s
- Maximum fluid temperature: 130°C/266°F
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Designed for horizontal or vertical mounting
- Used for a number of different fluids including: Lubrication, fuel, vegetable and hydraulic oils as well as any non-aggressive fluid with sufficient lubricating properties
- Suitable for a wide range of cooling, lubricating and transfer applications
IMO UCG Series
SPECS
- Maximum discharge pressure: 16 bar/232 PSIG
- Maximum flow rate: 316 GPM / 1,200 l/min
- Viscosity: 1.4 – 3,500 mm2/s
- Maximum fluid temperature: 155°C/311°F
- Vertical and horizontal installation
- Dry installation
BENEFITS
- Variety of port styles available
- Available in 17 displacements fitting into five casing sizes
- Used in lubrication, hydraulic and control oil services
- Foot or flange mounted
ALLWEILER EMTEC Series
SPECS
- Maximum discharge pressure: 130 bar/1,886 PSIG
- Maximum flow rate: 264 GPM / 1,000 l/min
- Viscosity: 1 – 2,000 mm2/s
- Maximum fluid temperature: 80°C/176°F
- Vertical and horizontal installation
- Dry installation
- In-tank installation
BENEFITS
- Offers superior reliability and longevity
- Delivers virtually noiseless and pulsation free pumping
- Wide flow range
Markets & Applications
Our reliable and efficient three-screw pumps are excelling in a number of industries.
No matter the market, no matter the application, we have the right three-screw pump solution for you.
Oil & Gas
Whether it's upstream, downstream and anything in between, our three-screw pumps set the standard for the oil and gas industry.
Some of the biggest names in the industry trust our three-screw pumps and our offshore and on-shore expertise. Our pumps offer reliable performance in areas like:
- Stripping
- Pipeline Injection
- Gathering
- Loading
- Unloading
- Field Upgrading
Meeting the round-the-clock demands of getting crude oil from upstream to downstream requires huge levels of both dependability and efficiency. Our three-screw pumps offer proven performance in areas like:
- Mainline Pumps/Pipeline Boosting
With their ability to handle a variety of fluids, our three-screw pumps are perfect for the challenges of storage facilities and offer reliable performance in areas like:
- Loading
- Unloading
- Shipping
- Mixing
- Blending
- Circulation
- Stripping
From changing regulations to rising power costs, the world of refineries is full of unique challenges. Our three-screw pumps help you meet them with their ability to handle high temperatures, high-pressures and a variety of corrosive process fluids. They're built for:
- Loading
- Unloading
- Shipping
- Mixing/Blending
- Stripping
- Process Fluid Circulation
- Lube Oil Pumps & Systems
- Power Generation
Commercial Marine & Defense
It takes a special brand of pump to stand up to the unique challenges of the open seas and our best-in-class three-screw pumps have proven to be more than up to the task time and time again.
Whether it's for fuel transfer or for your hydraulic systems, no fluid handling solution is better at providing the consistent, reliable flow you need than our three-screw pumps. Our pumps excel at:
- Heavy Fuel Boosting
- Heavy Fuel Transfer
- MDO Boosting
- MDO Transfer
- MDO-DMA Boosting
- MDO-DMA Transfer
- ME Lubrication Oil
- Gear Box
- Hydraulic Oil
- Priming Systems
- Cranes
- Pitch Control
- Gear Box L.O.
- Stern Lube
- Lubrication
- Hydraulics
Industrial Solutions
With their ability to handle a wide range of fluids in a variety of flows and conditions, our three-screw pumps are proving to be a real asset in a number of industrial applications.
With their consistent flow and unmatched reliability, our three-screw pumps are perfect for keeping your equipment lubricated and performing. They also offer exceptional performance in areas like:
Our three-screw pumps are found in a variety of areas in the building and construction industries. Their dependable and efficient performance are proving to be a real asset in areas like:
In such a competitive industry, you need all of the competitive advantages you can get and our three-screw pumps deliver. Whether it's lubricating equipment or transferring fuel, our fluid handling solutions bring efficiency and performance to areas like:
In mining, your entire operation revolves around your equipment. And our three-screw pumps excel at delivering the fuel and the lubricants to keep that equipment running. Our pumps offer reliable performance in areas like:
Power Generation
In a challenging industry where downtime is simply unacceptable, our reliable three-screw pumps are proving themselves in a number of areas including:
Got questions? We’ve got answers.
Want to find out more about our three-screw pump models and how they apply to your situation?
Let's talk.
Fill out the form to the right to get in touch with a CIRCOR expert and discover the perfect pump for your specific operation.
Or get product details, case studies and more information on the CIRCOR ALLFUEL Series pump, by clicking the link below.
Learn more
Three-screw Brochure
The Imo and Allweiler lines of three-screw pumps and systems deliver the features that matter most to you. Longer life‚ lower pressure ripple‚ lower contamination sensitivity and maximum energy savings result in the highest “Total Savings of Ownership” across the entire life-cycle of your pumping equipment solution.
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The Many Advantages of Three-Screw Pumps
CIRCOR’s Ian White and Henrik Wikström explain in World Pumps why three-screw pumps can optimize performance and efficiency in a broad spectrum of applications while delivering benefits across a very long lifecycle. Article used with permission and published in the November/December 2017 issue of World Pumps.
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Three Gorges Dam Case Study
When the largest hydroelectric power station in the world needed reliable pumps that could handle frequent pressure variations, they turned to CIRCOR and the Allweiler SN three-screw pump.
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Pumps in the West Case Study
For over 40 years, some of the worst conditions in Canada haven't stopped CIRCOR pipeline pumps.
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ALLWEILER ALLFUEL Series
Information for ALLFUEL Series pumps.
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ALLWEILER EMTEC-C Pumps
EMTEC three-screw pumps excel at moving chips and particles away from cutting surfaces both precisely and efficiently.
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ALLWEILER EMTEC-C Pumpen
Allweiler OptiFix Exzenterschneckenpumpen sind so konzipiert, dass sie in einem Bruchteil der üblichen Zeit demontiert und wieder zusammengebaut werden können.
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ALLWEILER SM Series
Information for SM Series pumps.
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ALLWEILER SN Series
Information for SN Series pumps.
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ALLWEILER Trilub Series
Information for Trilub Series pumps.
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IMO 3D Series
Information for 3D Series pumps.
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IMO 3E Series
Information for 3E Series pumps.
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IMO 3G Series
Information for 3G Series pumps.
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IMO 4SFC Series
Information for 4SFC Series pumps.
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IMO 4VKC Series
Information for 4VKC Series pumps.
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IMO 6D Series
Information for 6D Series pumps.
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IMO 6U/6T Series
Information for 6U/6T Series pumps.
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IMO 8L Series
Information for 8L Series pumps.
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IMO 12D Series
Information for 12D Series pumps.
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IMO 12L Series
Information for 12L Series pumps.
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IMO C323F Series
Information for C323F Series pumps.
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IMO C324A Series
Information for C324A Series pumps.
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IMO Elevator Series
Information for Elevator Series pumps.
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IMO T324N Series
Information for T324N Series pumps.
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IMO UCF Series
Information for UCF Series pumps.
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IMO UCG Series
Information for UCG Series pumps.
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