KRAL Rotary Screw Pumps
KRAL two-screw and three-screw pumps are high-efficiency positive displacement rotary systems engineered for the precise, low-pulsation transfer of heavy fuel oils, lubricating fluids, and hydraulic oils across marine, power generation, and heavy manufacturing applications.
Exclusive KRAL Partner: Cyclone Industries is the proud exclusive South African partner to KRAL Pumps, Austria — bringing world-class rotary screw pump technology to local industrial markets.
Product Overview
Cyclone is proudly an exclusive Partner to KRAL Pumps in Austria. KRAL two-screw and three-screw pumps are high-efficiency positive displacement rotary systems engineered for the precise, low-pulsation transfer of heavy fuel oils (HFO), lubricating fluids, and hydraulic oils. Designed for integration into robust industrial frameworks — including marine, power generation, and heavy manufacturing — these units provide exceptional volumetric efficiency and high power density. They are highly suited for critical applications such as boiler feeds, burner systems, and heavy-duty lubrication circuits.
Unlike centrifugal pumps, screw pumps operate on a linear flow rate principle that maintains a consistently high volumetric output regardless of fluctuations in fluid viscosity. This allows for precise, cost-effective flow regulation directly via motor speed control, ensuring optimal performance across highly variable operating conditions.
Core Engineering Features
Pulsation-Free & Low Shear Dynamics
The synchronized axial delivery of the multi-spindle geometry guarantees a constant flow rate. This continuous displacement eliminates pressure pulsations, mitigating system vibration, piping fatigue, and the degradation of shear-sensitive media.
Optimized Tribology & Material Durability
Pump housings are cast from high-strength nodular iron (EN-GJS-400) and paired with precisely nitrided steel spindles. A specialized internal heat treatment minimizes mechanical friction, allowing the pumped medium to function as a continuous hydrodynamic lubricant. This structural integrity ensures extended operational lifecycles, even when processing abrasive and corrosive media.
High Power Density
The systems offer exceptional delivery rates relative to their physical footprint. This compact architectural design is essential for spatially constrained skid integrations and retrofit installations requiring exact dimensional drop-in replacements for legacy fleets.
Advanced Control Integration
Due to the strict linearity between delivery rate and rotational speed, volumetric flow can be precisely and economically managed using Variable Frequency Drives (VFDs).
Hermetic Magnetic Couplings (Optional)
For applications subject to zero-leakage environmental mandates or extreme thermal loads, units can be equipped with maintenance-free, hermetically sealed magnetic couplings rated for fluid temperatures up to 300°C (572°F).
Performance Specifications
The performance matrix is scalable and structured to meet rigorous industrial demands, supporting both low- and high-viscosity transfer without compromising continuous flow rates.
Typical Applications
- Heavy Fuel Oil (HFO) transfer and boiler feed systems
- Lubricating oil circuits — marine, power generation, heavy manufacturing
- Hydraulic oil transfer and high-pressure hydraulic systems
- Burner fuel supply systems
- Skid-mounted pump packages and retrofit installations
- Zero-leakage applications with magnetic coupling option
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