Danfoss 180B3006 APP 6.5 High Pressure Pump
The Danfoss 180B3006 APP 6.5 is a high pressure axial piston pump built to move water where reliability and efficiency really matter. Instead of relying on a spinning impeller like a typical centrifugal pump, it uses a set of pistons that push a fixed volume of water with every stroke. That design gives it a steady, predictable flow no matter how much resistance is on the outlet side, which is exactly what a reverse osmosis membrane needs to work properly.
What makes this pump stand out is how little it asks of the people running it. The body is machined from duplex and super duplex stainless steel, so it shrugs off the corrosive nature of seawater and brackish water for years without breaking down. It runs oil-free and water-lubricated, has very few moving parts, and reaches efficiency levels near the top of its class, which translates directly into lower energy bills for whoever is operating the system.
Because it's a compact, self-contained unit, the APP 6.5 shows up in a wide range of settings. Desalination plants use it, but so do container-based water systems on islands and resorts, mobile units deployed for disaster relief, offshore platforms, and vessels that need a dependable source of fresh water at sea. If a system needs to turn salt water into something usable, this pump is a proven way to get there.
Key Features
- Axial piston, positive displacement design for consistent flow regardless of discharge pressure
- Body constructed from Duplex and Super Duplex stainless steel for superior corrosion resistance
- Oil-free, water-lubricated internal design
- Efficiency rates among the highest in the high pressure pump industry
- Low part count for simplified maintenance and long service intervals
- Compact footprint and lightweight construction relative to output capacity
- Engineered to EN 809 for handling low-viscosity, corrosive fluids
Applications
- Seawater Reverse Osmosis (SWRO) desalination plants
- Brackish water reverse osmosis (BWRO) treatment systems
- Containerized water systems for islands, resorts, and coastal residences
- Mobile water systems for humanitarian and military use
- Onboard freshwater systems for ships and yachts
- Offshore oil and gas platform water systems
- Municipal and regional waterworks
Specifications
- Manufacturer Part Number: 180B3006
- Model: APP 6.5
- Pump Type: Axial piston, positive displacement
- Body Material: Duplex stainless steel
- Seal Material: NBR
- Inlet Port Size: M42 (42mm) threaded
- Outlet Port Size: M42 (42mm) threaded
- Displacement: 63.3 cm³/rev
- Flow Rate (Max): 27.8 GPM / 107.2 L/min
- Flow Rate (Min): 2.26 m³/h
- Outlet Pressure (Max): 1200 psig / 80–83 barg
- Inlet Pressure Range: 0.5–5 barg
- Speed Range: 700–1800 RPM
- ATEX Compliance: No
Frequently Asked Questions
Q: Can the Danfoss 180B3006 APP 6.5 pump run continuously in a 24/7 desalination operation?
Yes. The APP 6.5 is engineered for continuous duty in RO plants, with low part count and long service intervals that support round-the-clock operation with minimal downtime.
Q: Does the APP 6.5 require oil lubrication?
No. It uses a water-lubricated design, which removes the need for oil changes and reduces the risk of oil contaminating the process water.
Q: What fluids is the 180B3006 pump rated to handle?
It is rated for low-viscosity, corrosive fluids such as seawater and brackish water, in line with its EN 809 design standard.
Q: Is the APP 6.5 suitable for a boat or yacht's onboard watermaker system?
Yes. Its compact size and corrosion-resistant construction make it a common choice for onboard freshwater production systems on ships and yachts, alongside its use in land-based and industrial installations.
Q: How does an axial piston pump like the APP 6.5 differ from a centrifugal pump for RO use?
An axial piston pump delivers a fixed flow per revolution regardless of back pressure, giving stable performance against a membrane's resistance, whereas a centrifugal pump's flow varies with discharge pressure.
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