The Danfoss APP 0.6 (code 180B3148) is an axial piston high-pressure pump for seawater and brackish-water reverse osmosis. It is oil-free and water-lubricated — the pumped water itself lubricates the bearings, so there is no oil circuit to maintain and no path for oil to reach the permeate. All wetted parts are Duplex and Super Duplex stainless steel for seawater corrosion resistance.
Documentation & Drawings
Technical Specifications
| Identification | |
| Code number | 180B3148 |
| Pump size | APP 0.6 |
| Series | APP 0.6 – 1.0 |
| Type | Axial piston, oil-free, water-lubricated |
| Version | ATEX |
| Other versions of this pump | 180B3048 (standard) |
| Displacement & Flow | |
| Geometric displacement | 4.07 cm³/rev (0.25 in³/rev) |
| Flow at 1000 rpm, max. pressure | 0.22 m³/h |
| Flow at 1500 rpm, max. pressure | 0.34 m³/h |
| Flow at 1200 rpm, max. pressure | 1.18 gpm |
| Flow at 1800 rpm, max. pressure | 1.78 gpm |
| Pressure | |
| Max. outlet pressure, continuous | 83 barg (1200 psig) |
| Min. outlet pressure | 20 barg (290 psig) |
| Inlet pressure, continuous | 0.5-5 barg (7.3-72.5 psig) |
| Max. inlet pressure, peak | 10 barg (145 psig) |
| Speed | |
| Min. speed, continuous | 700 rpm |
| Max. speed, continuous | 3450 rpm |
| Operating Conditions | |
| Media temperature | 2-50 °C (36-122 °F) |
| Ambient temperature | 0-50 °C (32-122 °F) |
| Sound pressure level at 1 m | 74 dB(A) |
| Mechanical | |
| Weight (dry) | 5.2 kg (11.5 lb) |
| Torque at max. outlet pressure | 5.8 Nm (4.2 lbf-ft) |
| Footprint with IEC motor | 0.1 m² (1.08 foot²) |
| Body material | Duplex / Super Duplex stainless steel |
| Typical Motor | |
| Motor size at max. speed, max. pressure | 2.2 kW |
| Motor size at rated rpm, max. pressure | 3 HP |
| Warranty & Origin | |
| Warranty | 8,000 hours service-free operation, max. 18 months from date of production, when run to Danfoss specifications |
| Manufacturer | Danfoss High Pressure Pumps |
| Country of origin | Denmark |
| Data sheet reference | Danfoss AI274333290009en-000702, §4.1 |
Videos
How an axial piston pump works — APP pump working animation
Why are axial piston pumps ideal for SWRO?
High pressure for SWRO: how to get 90% pump efficiency
Videos courtesy of Danfoss High Pressure Pumps.
Case Studies
Read the case study →
Read the case study →
Read the case study →
Read the case study →
Why an Axial Piston Pump for SWRO
In a positive-displacement axial piston pump, flow is set by displacement and shaft speed rather than by system pressure, so output stays stable as membranes foul and feed pressure rises. A centrifugal pump's output falls away as head increases; this one does not.
- Oil-free — lubricated by the pumped water, so no oil changes and no contamination path to the permeate.
- No high-pressure mechanical seal — a common wear point on other pump types is simply absent.
- Duplex / Super Duplex throughout the wetted path for seawater chloride resistance.
- Field serviceable — Danfoss supplies purpose-designed tool kits and service parts, which we stock.
Danfoss reports overall efficiency above 90% measured across more than a dozen operating SWRO plants; see their video above for the measurement basis. Actual efficiency depends on speed, pressure and system design.
Frequently Asked Questions
What flow will the APP 0.6 give me?
Does it come with a motor?
Do I need a boost pump on the inlet?
What filtration does it need?
What do I do when the system shuts down?
What is the warranty?
Do I need the ATEX version?
Specifications reproduced from Danfoss data sheet AI274333290009en-000702 (2024.06), §4.1. APP® is a registered trademark of Danfoss A/S. Danfoss reserves the right to alter specifications without notice; confirm critical values against the current data sheet before purchase.
