PAH 2 - 12.5

Summary

Product Identification

Danfoss PAH high-pressure pumps are positive displacement, axial piston pumps designed to supply water flow under high pressure for various tap water applications. Flow is proportional to input shaft revolutions (rpm).

• Pump Series: PAH 2/4/6.3, PAH 10/12.5, PAH 20/25/32, and PAH 50/63/70/80/100
• Housing Material: AISI 304 for all listed pump sizes.
• Certifications: ISO 9001, ISO 14001, ITF 16949. ATEX, ABS, and DNV GL certifications are available on request. ATEX certified versions are indicated with "Ex" in the designation.

Operating Limits

• Media Temperature: 2-50 °C (36-122 °F)
• Ambient Temperature: 0-50 °C (32-122 °F)
• Minimum Continuous Speed: 700 rpm
• Maximum Speed:
  • PAH 2-32: 1800 rpm
  • PAH 50: 1800 rpm
  • PAH 63/70/80: 1800 rpm (can run 1800-2400 rpm under specific conditions: inlet pressure 2-4 barg, outlet pressure max. 140 barg for a maximum of 500 hours between service inspection)
  • PAH 100: 1500 rpm
• Minimum Outlet Pressure: 30 barg (435 psig)
• Maximum Outlet Pressure:
  • PAH 2/4/6.3: 140 barg (2030 psig)
  • PAH 10/12.5: 160 barg (2320 psig)
  • PAH 20/50/100: 80 barg (1160 psig)
  • PAH 25/32/63/70/80: 160 barg (2321 psig)
• Inlet Pressure, Continuous: 0-4 barg (0-58 psig)
  • For PAH 20-32 above 1800 rpm: 2-6 barg
  • For PAH 63/70/80 running 1800-2400 rpm: 2-4 barg

Feed Water

Proper filtration is crucial for pump performance, maintenance, and warranty.

• Main Filter Efficiency: 99.98% at 10 µm.
• Recommended Filter Type: Precision depth filter cartridges rated 10 µm abs. β10 ≥ 5,000.
• Not Recommended: Bag filters or string-wound filter cartridges (typically 50% filtration efficiency).

Electrical

The required motor power (P) and torque (M) can be calculated using the following equations:

• P = (n x V x p) / (600,000 x η)
• M = (V x p) / (62.8 x η) Where:
• P: Power (kW)
• M: Torque (Nm)
• η: Mechanical efficiency
• p: Pressure (barg)
• n: Motor speed (rpm)
• V: Displacement (cm³/rev)

Mechanical Efficiency (η) at Max Pressure:

• PAH 2, 4, 6.3: 0.82
• PAH 10, 12.5: 0.9
• PAH 20, 25, 32, 50, 63, 70, 80, 100: 0.95

Mechanical / Hydraulic

Danfoss PAH pumps are designed for high efficiency, low energy consumption, and low-pressure pulsation, eliminating the need for pulsation dampeners. They can be installed horizontally or vertically.

Geometric Displacement (cm³/rev / in³/rev):

• PAH 2: 2 / 0.12
• PAH 4: 4 / 0.24
• PAH 6.3: 6.3 / 0.38
• PAH 10: 10 / 0.60
• PAH 12.5: 12.5 / 0.75
• PAH 20: 20 / 1.22
• PAH 25: 25 / 1.53
• PAH 32: 32 / 1.95
• PAH 50: 50 / 3.05
• PAH 63: 63 / 3.84
• PAH 70: 70 / 4.27
• PAH 80: 80 / 4.88
• PAH 100: 100 / 6.00

Typical Flow (l/min / gpm) at Max Pressure:

• PAH 2: 1.0 l/min (1000 rpm), 2.0 l/min (1500 rpm), 0.4 gpm (1200 rpm), 0.7 gpm (1800 rpm)
• PAH 4: 3.2 l/min (1000 rpm), 5.2 l/min (1500 rpm), 1.0 gpm (1200 rpm), 1.7 gpm (1800 rpm)
• PAH 6.3: 5.6 l/min (1000 rpm), 8.7 l/min (1500 rpm), 1.8 gpm (1200 rpm), 2.8 gpm (1800 rpm)
• PAH 10: 8.4 l/min (1000 rpm), 13.4 l/min (1500 rpm), 2.7 gpm (1200 rpm), 4.3 gpm (1800 rpm)
• PAH 12.5: 11.0 l/min (1000 rpm), 17.2 l/min (1500 rpm), 3.5 gpm (1200 rpm), 5.5 gpm (1800 rpm)
• PAH 20: 18.8 l/min (1000 rpm), 28.9 l/min (1500 rpm), 5.9 gpm (1200 rpm), 9.1 gpm (1800 rpm)
• PAH 25: 22.5 l/min (1000 rpm), 35.2 l/min (1500 rpm), 7.2 gpm (1200 rpm), 11.1 gpm (1800 rpm)
• PAH 32: 29.7 l/min (1000 rpm), 45.9 l/min (1500 rpm), 9.4 gpm (1200 rpm), 14.5 gpm (1800 rpm)
• PAH 50: 47.0 l/min (1000 rpm), 72.1 l/min (1500 rpm), 14.8 gpm (1200 rpm), 22.7 gpm (1800 rpm)
• PAH 63: 56.2 l/min (1000 rpm), 87.9 l/min (1500 rpm), 145 l/min (2400 rpm), 17.9 gpm (1200 rpm), 27.8 gpm (1800 rpm)
• PAH 70: 63.4 l/min (1000 rpm), 98.5 l/min (1500 rpm), 162 l/min (2400 rpm), 20.1 gpm (1200 rpm), 31.1 gpm (1800 rpm)
• PAH 80: 73.9 l/min (1000 rpm), 114.1 l/min (1500 rpm), 187 l/min (2400 rpm), 23.4 gpm (1200 rpm), 35.9 gpm (1800 rpm)
• PAH 100: 96.7 l/min (1000 rpm), 146.9 l/min (1500 rpm), 30.4 gpm (1200 rpm)

Typical Motor Size (kW / hp) at Max Pressure:

• PAH 2: 0.9 kW (1500 rpm), 1.5 hp (1800 rpm)
• PAH 4: 1.7 kW (1500 rpm), 2.7 hp (1800 rpm)
• PAH 6.3: 2.6 kW (1500 rpm), 4.2 hp (1800 rpm)
• PAH 10: 4.5 kW (1500 rpm), 7.3 hp (1800 rpm)
• PAH 12.5: 5.6 kW (1500 rpm), 9.0 hp (1800 rpm)
• PAH 20: 4.4 kW (1500 rpm), 7.1 hp (1800 rpm)
• PAH 25: 10.8 kW (1500 rpm), 17.3 hp (1800 rpm)
• PAH 32: 13.8 kW (1500 rpm), 22.3 hp (1800 rpm)
• PAH 50: 10.6 kW (1500 rpm), 17.1 hp (1800 rpm)
• PAH 63: 26.8 kW (1500 rpm), 43.1 hp (1800 rpm)
• PAH 70: 29.8 kW (1500 rpm), 47.9 hp (1800 rpm)
• PAH 80: 34.0 kW (1500 rpm), 54.8 hp (1800 rpm)
• PAH 100: 42.6 kW (1500 rpm)

Torque at Max. Spec. (Nm / lbf-ft):

• PAH 2: 5.9 / 4.4
• PAH 4: 10.9 / 8.0
• PAH 6.3: 16.7 / 12.3
• PAH 10: 29.0 / 21.4
• PAH 12.5: 35.8 / 26.4
• PAH 20: 28.0 / 20.7
• PAH 25: 68.5 / 50.2
• PAH 32: 88.1 / 65.0
• PAH 50: 67.8 / 50.0
• PAH 63: 170.8 / 126.0
• PAH 70: 189.7 / 140.0
• PAH 80: 216.8 / 160.0
• PAH 100: 135.5 / 100.0

Sound Pressure Level (dB(A)):

• PAH 2/4/6.3: 76
• PAH 10/12.5: 75
• PAH 20/25/32: 79
• PAH 50/63/70/80: 80
• PAH 100: 81 (Measurements according to EN ISO 3744: 2010 / dB(A) [LPA, 1m] values are calculated at max pressure and rpm for a motor pump unit.)

Weight (kg / lbs):

• PAH 2/4/6.3: 4.4 / 9.7
• PAH 10/12.5: 7.7 / 17.0
• PAH 20/25/32: 16 / 35
• PAH 50/63/70/80/100: 31 / 68

Dimensions and Connections: Detailed dimensions and connection diagrams are available in the official PDF datasheet.

Service

Danfoss PAH pumps are designed for long service life with minimum service required.

• Service Intervals: Up to 8,000 hours when Danfoss specifications are met.
• Key Factors for Lifetime: Adherence to system design and operation recommendations. Poor filtration is identified as the number one cause of pump damage.
• Factors Affecting Performance/Lifetime:
  • Running the pump at speeds outside specifications.
  • Supplying water at temperatures higher than recommended.
  • Running the pump at inlet pressures outside specifications.
  • Running the pump at outlet pressures outside specifications.
• Recommended Inspection: After 8,000 hours of operation, inspect and replace worn parts (e.g., pistons, shaft seals) as necessary.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the official OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used for the project.

Official datasheet (PDF)

Lenntech datasheet mirror