Danfoss 180B3005 APP 5.1 High Pressure Pump
The Danfoss 180B3005 APP 5.1 is a compact axial piston pump built to move salt or brackish water at high pressure without breaking a sweat. It's a common choice for reverse osmosis desalination setups, but it isn't limited to marine or coastal use — anywhere a system needs to push low-viscosity, corrosive fluid through tight tolerances at high pressure, this pump earns its place. The Duplex stainless construction stands up to the demands of continuous salt water exposure, and the self-lubricating design means the fluid being pumped does double duty as the lubricant, so there's no oil system to maintain.
What makes the APP 5.1 stand out is how little it asks of the people running it. Because it's a fixed displacement pump, flow output tracks directly with shaft speed and pump displacement, which keeps performance predictable regardless of downstream pressure changes. Fewer moving parts translate into fewer things that can go wrong, and the built-in flushing valve lets water pass from inlet to outlet whenever the pump sits idle, protecting internal components between duty cycles. For operators running desalination plants, industrial water treatment lines, or other high-pressure fluid transfer systems, this pump offers a dependable, low-maintenance option that's engineered for long service life.
Key Features
- Axial piston design for a lightweight, compact footprint
- Self-lubricating operation using the pumped fluid, no oil required
- Fixed displacement design with flow proportional to shaft speed
- Duplex stainless steel body for corrosion resistance
- Integrated flushing valve allows fluid flow when the pump is idle
- Engineered for long service life with minimal maintenance
Applications
- Seawater reverse osmosis desalination systems
- Brackish water treatment and filtration
- High pressure salt water pumping
- Industrial water supply and distribution systems
- Low viscosity, corrosive fluid transfer applications
Specifications
- Part Number: 180B3005
- Body Material: Duplex stainless steel
- Displacement: 50.2 cm³/rev (3.06 in³/rev)
- Max Flow: 21.7 gpm / 83.7 l/min
- Min Flow: 7.42 gpm / 28.54 l/min
- Max Outlet Pressure: 83 barg / 1200 psig
- Inlet Pressure Range: 0.5–5 barg (7.3–72.5 psig)
- Speed Range: 700–1800 rpm
- Inlet Port Size: M42, metric thread
- Drain Port Size: M6, metric thread
- Ambient Temperature Range: 0°C to 50°C (32°F to 122°F)
- ATEX Compliance: No
Frequently Asked Questions
Q: Can the Danfoss 180B3005 handle fluids other than salt water?
A: Yes, it's designed for low viscosity, corrosive fluids in general, so it works well beyond marine or seawater applications wherever similar fluid handling is needed.
Q: Does this pump require an external lubrication system?
A: No, the APP 5.1 lubricates its own moving parts using the fluid being pumped, which eliminates the need for a separate oil system.
Q: What happens when the pump isn't running?
A: The integrated flushing valve allows fluid to pass from the inlet to the outlet while the pump is idle, helping protect internal components between operating cycles.
Q: Is the flow rate affected by changes in downstream pressure?
A: No, since it's a fixed displacement pump, flow stays proportional to shaft speed and displacement regardless of counter-pressure changes.
Q: What kind of maintenance does this pump typically need?
A: Its simple design with few moving parts is built for easy operation and maintenance, requiring minimal upkeep to sustain high efficiency over its service life.
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