Danfoss PAH 80 High-Pressure Tap Water Pump 180B0041

Danfoss PAH 80 High-Pressure Tap Water Pump 180B0041

The Danfoss PAH 80 (Part Number: 180B0041) is an industrial-duty, positive displacement axial piston pump engineered specifically for high-pressure technical tap-water systems. Operating on swashplate principles, the PAH 80 utilizes the pumped fluid itself for hydrostatic bearing lubrication and thermal cooling, completely eliminating internal lubricating oils and cross-contamination risks.

The unit handles continuous operating pressures up to 160 barg (2,321 psig) with volumetric efficiency exceeding 95% across its operational curve. The compact inline profile delivers an exceptional power-to-weight ratio (31 kg dry weight), making it an engineering benchmark for high-pressure marine water mist firefighting, gas turbine inlet cooling, adiabatic humidification, reverse osmosis pre-charging, and industrial process wash-down systems.

Model Details

• Manufacturer: Danfoss A/S
• Product Line: PAH Series (Pumps for Tap Water)
• Model Code: PAH 80
• Danfoss Manufacturer Part Number (MPN): 180B0041
• Displacement Class: 80.0 cm³/rev (4.88 in³/rev)

Technical Details

Features

1. 100% Oil-Free Hydrostatic Design: Lubricated entirely by the process fluid; contains zero hydrocarbon lubricants, eradicating oil-seal failures and preventing fluid contamination.
2. Ultra-Low Pressure Ripple & Vibration: Multi-piston swashplate geometry generates near-pulse-free flow, minimizing hydraulic hammer, cavitation erosion, and mechanical fatigue on discharge piping manifolds.
3. Corrosion-Resistant AISI 304 Construction: All wetted rotating and stationary components are machined from AISI 304 stainless steel and specialized carbon-reinforced polymers for long service lives in high-velocity treated water.
4. Direct-Drive Mechanical Efficiency: Compatible with standard 4-pole and 6-pole IEC/NEMA electric motors via flexible elastomeric jaw couplings, eliminating speed-reduction gearboxes and reducing electrical parasitic loads.
5. Modular In-Situ Field Overhauls: Symmetrical cartridge layout allows quick replacement of rotating groups, valve plates, and shaft seals on site without disconnecting primary suction or discharge pipe manifolds.

Compatibility

• Fire Suppression Skids: Marioff HI-FOG Marine Machinery Space & Accommodation skids, Semco Maritime, Danfoss Fire Safety SEM-SAFE, FOGTEC High-Pressure Water Mist systems.
• Humidification & Cooling: Condair, Carel humiFog, Munters, and Mee Industries gas turbine inlet air fogging units.
• Prime Movers: IEC Frame 200L/225S (50 Hz, 37–45 kW) or NEMA 324T/326T (60 Hz, 50–60 HP) squirrel-cage induction motors.

Part Number Cross-References

• Danfoss Standard Model: 180B0041 (Bare shaft pump, AISI 304, right-hand/standard rotation)
• Danfoss ATEX Certified Variant: 180B6141 (Identical hydraulic frame, ATEX Group II, Category 2/3 compliant)
• Super Duplex / Seawater Counterpart: Danfoss APP 78 / APP 86 Series (Duplex/Super Duplex alloys for brackish water & marine desalination)
• Direct Predecessor Codes: 180B0021 (Verify port flange geometry when upgrading legacy installations)

Frequently Asked Questions

What type of water can be safely pumped through the PAH 80?

The standard Danfoss PAH 80 (180B0041) is built with AISI 304 stainless steel and engineered specifically for potable municipal tap water and clean technical freshwater. It is not suitable for seawater or high-chloride brackish water; for high-salinity seawater applications, utilize the Danfoss APP series constructed in Duplex and Super Duplex stainless steel.

How do I control flow output on the Danfoss PAH 80?

Because the PAH 80 has a fixed volumetric displacement of 80.0 cm³/rev, discharge volume is directly proportional to shaft speed. Modulate flow using a Variable Frequency Drive (VFD) within the continuous permissible motor operating window of 700 to 1,800 RPM.

Why is there no oil drain port or sight glass on this pump?

The Danfoss PAH pump family features an entirely oil-free design. The internal bearings, swashplate interface, and pistons are lubricated and cooled entirely by the pumped water. This avoids lube oil checks, top-ups, and contamination of clean-water process streams.

What causes high-pressure water leakage from the shaft seal?

Shaft seal seepage typically indicates one of three root causes: angular misalignment between the pump and driver shaft, inlet starvation/cavitation causing localized heating, or operation with particulate contamination exceeding the 10 µm filtration specification.

Can the pump run dry for testing rotation direction?

No. Never jog or rotate the pump under electrical power while dry. Dry rotation strips the carbon-filled polymer slipper shoes within seconds. Always prime, bleed, and verify positive inlet pressure before performing a phase-check or motor rotation test.