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Janus seawater axial piston pump range are optimised for reverse osmosis systems, with a design versatile enough to support numerous additional high-pressure applications.The Janus seawater pumps operate as positive-displacement units, moving a defined volume of water with each piston cycle. As a result, the pump’s output flow is directly proportional to the motor’s rotational speed.. |
Mechanical seals are advised for constant duty applications or duty above 2500 hours between service intervals.
| Displacement (cc/rev) | 4.6 | 6.0 | |
| Max. RPM | Boosted: * | 2000 | 2000 |
| Min. Input Power (kW) | 1.4 | 1.8 | |
| Max. Water Flow (m³/hr) | 0.55 | 0.72 | |
| Max. Cont. Pressure (Barg) | 80 | 80 | |
| Weight (kg) | 2.2 | 2.2 | |
| Temperature (°C) | Max: ** | 50 | 50 |
| Min: *** | 2 | 2 |
* Pump speeds above Max. RPM are possible under higher boost conditions, consult TWHC for details.
** Higher temperature operation is possible, consult TWHC for details.
*** Consult TWHC for lower temperature conditions.
PDF (Portable Document Format) files open easily in popular readers such as Google Chrome or Adobe Acrobat Reader.
STEP files are compatible with many 3D design packages, including SolidWorks, AutoCAD 3D, and even Blender.
- Info
- Specification
- Performance
- Download
Janus seawater axial piston pump range are optimised for reverse osmosis systems, with a design versatile enough to support numerous additional high-pressure applications.The Janus seawater pumps operate as positive-displacement units, moving a defined volume of water with each piston cycle. As a result, the pump’s output flow is directly proportional to the motor’s rotational speed.. |
Mechanical seals are advised for constant duty applications or duty above 2500 hours between service intervals.
| Displacement (cc/rev) | 4.6 | 6.0 | |
| Max. RPM | Boosted: * | 2000 | 2000 |
| Min. Input Power (kW) | 1.4 | 1.8 | |
| Max. Water Flow (m³/hr) | 0.55 | 0.72 | |
| Max. Cont. Pressure (Barg) | 80 | 80 | |
| Weight (kg) | 2.2 | 2.2 | |
| Temperature (°C) | Max: ** | 50 | 50 |
| Min: *** | 2 | 2 |
* Pump speeds above Max. RPM are possible under higher boost conditions, consult TWHC for details.
** Higher temperature operation is possible, consult TWHC for details.
*** Consult TWHC for lower temperature conditions.
PDF (Portable Document Format) files open easily in popular readers such as Google Chrome or Adobe Acrobat Reader.
STEP files are compatible with many 3D design packages, including SolidWorks, AutoCAD 3D, and even Blender.
No Risk of Contamination
Our Janus axial piston pumps are totally oil free. As a result of employing advanced materials, high velocity and loaded sliding surfaces, the range of pumps can operate effectively with seawater as their only coolant/lubricant therefore, this removes the potential for cross contamination of the system fluid or lubricating oil.
Safe & Efficient
The pumps utilise technologies that suppress vibration and deliver low‑noise, high‑efficiency performance.
Their multi‑piston configuration, combined with high rotational speeds, produces exceptionally low pulsation.
This enables a compact, lightweight design that offers safe operation and reduced operating costs.
For even more long‑term cost‑effective solutions, please refer to our integral energy‑recovery models, the Janus Power Centre catalogues, or consult TWHC.
Easy Installation, Operation & Maintenance
Standardised porting and mounting solutions ensure straightforward installation, and the accompanying detailed manual & service guide helps maintain reliable, high‑level performance.
Accurate flow metering is simply achieved with the control of the output shaft speed.
Reliability
All units are manufactured and tested on-site to the published performance data, ensuring high quality is kept consistent. All materials used for the seawater pumps are selected to provide excellent corrosion resistance while remaining cost-effective:
Duplex Build – All water-contacting components are manufactured from bar-stock Duplex 2205 (with
no cast parts), delivering maximum corrosion resistance for extreme salt concentrations.
Hybrid Build – Components are produced in 316L stainless steel, with strategically selected internal parts—such as bearing surfaces—manufactured from bar-stock Duplex 2205.
Inlet Conditions – 3 Port Design
Our 3-port boosted pumps are designed for operation with a pressurised feed supply. The minimum inlet
pressure is determined by pump shaft speed. As a guide:
P6 – P300 models: Minimum inlet pressure 3.0 – 3.6 Bar
P600 models: Minimum inlet pressure 3.5 – 4.1 Bar
The 3-port design isolates the feed water from the internal leakage flow, which must be routed to a low-pressure drain or sump.
This offers several performance advantages:
Reduced power requirement: The pump only needs to generate the differential pressure. For
example, with a 5 Bar feed and 60 Bar discharge, the pump produces only the remaining 55 Bar.
Improved mechanical seal life: Because the feed pressure and casing (leakage) pressure are separated, the shaft seal operates at a significantly lower pressure. This reduces wear, minimises maintenance, and prevents low-pressure cavitation.
A constant positive inlet pressure must be maintained, of at least 2.5 Bar above the casing (“T”) pressure always.
All seawater pumps are designed to be operated anticlockwise unless specifically stated or requested.
Direction of rotation is based on looking at the shaft of the pump, see the diagram.
