When designing a hydraulic cooling or lubrication system, one of the most critical components is the pump. In this blog, we explore why screw pumps are a preferred choice for these applications, with insights from HYDAC’s own Andrea Cimadoro, National Development Manager for Cooling Systems.
What Is a Screw Pump?
Screw pumps are part of the positive displacement pump family and belong to the rotary pump subgroup.
- Deliver constant flow at a fixed speed, regardless of discharge pressure
- Operate with low noise and minimal vibration
- Ideal for applications requiring long service life and reliability
Key Benefits of Screw Pumps
Compared to gear or vane pumps, screw pumps offer a wide range of advantages, especially in demanding environments:
- Extremely quiet operation – up to 5 times quieter than gear pumps
- Low vibration – reduces wear on system components
- High durability – fewer maintenance interventions (e.g. seal replacements)
- Broad viscosity handling – from as low as 2 cSt up to 20,000 cSt
- Versatile fluid compatibility – can be used with oil, water-glycol, magnetic fluids (with proper configuration)
- Integrated bypass valves – adjustable to 5, 10, or 15 bar pressure
When Not to Use a Screw Pump
Despite their versatility, screw pumps aren’t suitable for every fluid or system design:
- Sensitive to suction design – require a positive suction head for reliable operation
- Not ideal if the pump is positioned above the fluid reservoir
- Material compatibility matters – aluminum, steel, and cast iron components may react with:
- Aggressive chemicals
- Fluids with high acidity or unsuitable pH
- Always send fluid datasheets for compatibility review
How to Size a Screw Pump
Correct sizing ensures optimal performance and system longevity. HYDAC uses advanced software tools developed in Switzerland and Germany over 15+ years to assist in pump selection.
To size a screw pump, you'll need:
- Type of fluid and full datasheet
- Temperature range of operation
- Required flow rate
- Suction line design and cold start requirements
The output includes key charts such as:
- Pressure vs Flow curve
- NPSH (Net Positive Suction Head) requirement – critical for design engineers
Why HYDAC Australia Specialises in Screw Pumps
HYDAC Australia has positioned itself as a global leader in screw pump technology for lubrication systems. This strategic focus was based on Australia’s unique geographic and cost considerations.
- Over 2,000 pumps installed locally in the past decade
- Local inventory and fast turnaround for modifications
- In-house ability to adjust:
- Suction orientation (axial/perpendicular)
- Motor mounting types (B14, B35)
- Bypass pressure settings
- Recognised as a Centre of Excellence for screw pumps within the HYDAC Group
- Supporting clients across Australasia and the Americas
Availability and Lead Times
- In-stock pumps – ready for immediate delivery
- Local modifications – quick turnaround times
- Manufacturing lead time – typically 3–4 weeks + freight (total ~4–5 weeks)
Screw pumps offer unmatched reliability, efficiency, and quiet operation for hydraulic cooling and lubrication systems. While not suitable for every fluid or layout, when properly selected, they serve as the heart of a robust hydraulic system.
To size a screw pump for your system or get expert advice, contact HYDAC Australia!
Listen to our podcast: Understanding Screw Pumps
