Danfoss APP 8.2 (180B3008) — Industrial-Grade High Pressure Axial Piston Pump for Demanding Fluid Systems
The Danfoss APP 8.2, part number 180B3008, is a fixed-displacement, axial piston high pressure pump engineered specifically for handling low-viscosity, corrosive fluids under sustained high pressure. Built to EN 809 standards and constructed from a proven combination of Duplex and Super-Duplex stainless steel, this pump was developed for the rigors of seawater reverse osmosis (SWRO), brackish water treatment, industrial desalination, and other aggressive fluid processing applications. What sets the APP 8.2 apart is its self-lubricating design — the pumped fluid itself lubricates all internal moving parts, eliminating the need for external oil lubrication systems and simplifying installation and long-term maintenance considerably.
At its core, the APP 8.2 operates on a straightforward and reliable principle: flow output is directly proportional to shaft speed, regardless of discharge pressure. This means it delivers a consistent 36.0 GPM (138.5 L/min) at maximum operating speed without the performance degradation you see in centrifugal pump designs under load. Rated to 83 barg (1,200 psig) maximum outlet pressure and designed to run between 700 and 1,800 RPM, the pump fits naturally into variable-speed drive setups for precise process control. Its compact footprint, integrated flushing valve, and the ability to mount either vertically or horizontally make it a practical choice for skid-mounted systems, containerized RO trains, and installations where space is at a premium.
Key Features
- Fixed displacement axial piston design — flow is proportional to shaft RPM, independent of discharge pressure
- Self-lubricating operation — the pumped medium lubricates all internal components, no external oil required
- Duplex and Super-Duplex stainless steel construction for long-term corrosion resistance in aggressive fluid environments
- Integrated flushing valve allows fluid to flow from inlet to outlet when the pump is not running, protecting the system
- Compact, lightweight design supports both vertical and horizontal installation
- Compatible with variable frequency drives (VFDs) for precise flow and pressure control
- Long service intervals — up to 8,000 hours between service events, up to 25,000 hours before major overhaul
- Up to ~92% hydraulic efficiency, among the highest available for high pressure positive displacement pumps
- No belts, no external lubrication system, fewer moving parts — reduced mechanical complexity
Applications
- Seawater reverse osmosis (SWRO) desalination systems
- Brackish water reverse osmosis (BWRO) treatment plants
- Industrial water treatment and water purification skids
- Containerized and modular desalination units
- High-pressure fluid transfer for low-viscosity corrosive liquids
- Zero Liquid Discharge (ZLD) and Minimum Liquid Discharge (MLD) systems
- Irrigation feed pump systems requiring high-pressure output
- Industrial process water systems handling saline or chemically aggressive feedwater
Specifications
- Part Number: 180B3008
- Model: APP 8.2
- Pump Type: Fixed Displacement Axial Piston
- Displacement: 80.4 cm³/rev (4.91 in³/rev)
- Max Flow Rate: 36.01 GPM (138.5 L/min / 8.31 m³/h)
- Min Flow Rate: 13.01 GPM (50.06 L/min / 3.0 m³/h)
- Max Outlet Pressure: 83 barg (1,200 psig)
- Min Outlet Pressure: 20 bar
- Max Inlet Pressure: 5 barg (72.5 psig)
- Min Inlet Pressure: 0.5 barg (7.3 psig)
- Max Speed: 1,800 RPM (continuous)
- Min Speed: 700 RPM (continuous)
- Inlet Port Size: M42 Metric threaded (42 mm)
- Outlet Port Size: M42 Metric threaded (42 mm)
- Drain Connection: M6 Metric thread
- Body Material: Duplex Stainless Steel
- Ambient Temperature Range: 0°C to 50°C (32°F to 122°F)
- Design Standard: EN 809
- Lubrication: Self-lubricating (pumped fluid)
- ATEX Compliance: No
- Gross Weight: 36.06 kg of pump only
Frequently Asked Questions
Q: Does the Danfoss APP 8.2 require external oil lubrication?
No. The APP 8.2 is entirely self-lubricating — all internal moving components, including the pistons and bearings, are lubricated by the fluid being pumped. This eliminates the need for any external oil system, reduces maintenance requirements, and removes oil contamination risk from the process fluid.
Q: Can this pump be used with a variable frequency drive (VFD)?
Yes, and it pairs exceptionally well with VFDs. Because the APP 8.2 is a fixed displacement pump, its output flow is directly proportional to shaft speed. Pairing it with a variable frequency drive gives operators fine-grained control over both flow rate and system pressure within the pump's rated speed range of 700 to 1,800 RPM.
Q: What fluids is the Danfoss APP 8.2 suitable for?
The APP 8.2 is specifically designed for low-viscosity, corrosive fluids such as seawater and brackish water. Its Duplex and Super-Duplex stainless steel construction resists the corrosive effects of high-salinity feedwater over extended service periods. It is not intended for oil, high-viscosity fluids, or fluids requiring external lubrication compatibility.
Q: What does the integrated flushing valve do?
When the pump is not in operation, the integrated flushing valve allows fluid to continue flowing passively from the inlet through to the outlet. This prevents stagnation, reduces the risk of biological fouling or mineral scaling inside the pump body, and helps protect internal components during system shutdown periods.
Q: What is the expected service interval for the APP 8.2?
Under normal operating conditions, the APP 8.2 is designed for service intervals of up to 8,000 hours, with major overhauls not typically required until approximately 25,000 hours of operation. The simplified internal design — with few moving parts and no belt drives or external lubrication system — contributes to this extended service life and predictable maintenance schedule.
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