For manufacturers of compact seawater desalination units (0.1–0.5 m³/h), lab-scale reverse osmosis systems, and light industrial pure water equipment, selecting the right high-pressure pump is critical. Among the most commonly used models in this range is the Danfoss APP 0.6, known for its compact axial piston design, oil-free operation, and stable performance in SWRO applications.
However, due to growing concerns over lead time, cost, and regional serviceability, many equipment builders are now considering engineering-equivalent pump alternatives that can meet the same technical requirements — while offering better flexibility in sourcing and integration.
One such option is the HPS 0.6 from RohrePumps, a model developed for compatibility with APP 0.6, offering matched hydraulic performance and mechanical design for RO system builders.
Target Applications for HPS 0.6
- Marine RO systems – vessels, yachts, offshore rigs
- Laboratory and ultrapure water systems – stable supply for research and testing
- Compact or containerized RO units – mobile and emergency water treatment packages
- Small industrial water treatment – food & beverage, boiler feed, process water
- Emergency and field water supply – disaster relief, construction sites, remote camps
- High-end residential or island use – small-scale seawater desalination for daily needs(typically 2–11 m³/day)
Technical Comparison: Danfoss APP 0.6 vs RohrePumps HPS 0.6
| Parameter | Danfoss APP 0.6 | RohrePumps HPS 0.6 |
|---|---|---|
| Displacement | 4.07 cc/rev | 4.07 cc/rev |
| Flow Range | 1.8–13 L/min | 1.5–8 L/min |
| Pressure Range | 20–83 barg | 20–85 barg |
| Speed Range | 700–3450 rpm | 700–3500 rpm |
| Media Temperature | 2–50°C | 2–50°C |
| Lubrication | Water-lubricated | Water-lubricated |
| Inlet Pressure Max | 2 barg | 2 barg |
| Flush Valve | Integrated | Integrated |
| Port Connection | G 3/4″ or SAE | G 3/4″ or SAE |
| Mounting | Identical footprint | Identical footprint |
| Net Weight | 5.2 kg | 3.6 kg |
| Country of Origin | Denmark | China |
Note: Both pumps are oil-free and designed for continuous-duty desalination and RO applications. No gearbox or external lubrication is required.
Key Engineering Notes
- Drop-in Compatibility: The HPS 0.6 shares the same connection ports and base mounting as APP 0.6. In most RO skids, no redesign is needed.
- Matched Operating Envelope: Flow, pressure, and speed ranges are aligned. Pump head materials are corrosion-resistant and suitable for seawater RO use.
- Compact & Lightweight: HPS 0.6 weighs approx. 30% less, which benefits compact skids or mobile units.
- Availability & Lead Time: HPS 0.6 is available with more flexible lead times and localized supply chains, especially for Asia, Middle East, and OEM builders outside Europe.
When to Consider HPS 0.6 as an APP 0.6 Alternative?
Consider using HPS 0.6 if:
- You are designing a compact RO skid requiring 0.1–0.5 m³/h feed flow for seawater treatment.
- You need a technical equivalent to APP 0.6 but with faster delivery or more cost-effective sourcing;
- You are replacing pumps in small-scale RO systems and require mechanical compatibility with minimal or no modifications.
- Your project schedule cannot accommodate extended lead times from European suppliers.
- You prefer to maintain spare parts availability locally or through regional channels.
Conclusion
The RohrePumps HPS 0.6 provides a mechanically compatible and functionally equivalent alternative within the 0.1–0.5 m³/h range, to alternative the Danfoss APP 0.6 for small-capacity desalination and RO systems. It is particularly suitable for OEMs and system builders seeking flexibility in sourcing without compromising on performance or reliability.
For technical documentation, 3D drawings, or integration support, please contact RohrePumps engineering team or authorized distributors.
