PAHT 2 - 12.5

Summary

Product Identification

Danfoss PAHT high-pressure pumps are positive displacement, axial piston pumps. The product line includes PAHT 2-6.3, PAHT 10-12.5, PAHT 20-25, PAHT 50-90, and PAHT 256-308 models. PAHT G 2-308 and ATEX PAHT G pump variants are also mentioned.

General Features & Benefits

• Zero risk of lubricant contamination: Oil lubricants are replaced with the pumped medium (water), eliminating contamination risk.
• Low maintenance costs: Efficient design and all-stainless steel construction ensure long lifetime, with service intervals of up to 8,000 hours when Danfoss specifications are met. Service is designed to be easy and can be carried out on site.
• Low energy costs: The highly efficient axial piston design provides low energy consumption.
• Easy installation: Features a light and compact design, allows horizontal or vertical installation, requires no pulsation dampeners due to low-pressure pulsation, is suitable for both boosted inlet pressure and water supply from a tank, and needs no cooling circuits due to high mechanical efficiency.
• Certified quality: Fulfills stringent hygiene requirements (VDI 6022, HACCP) and holds ISO 9001, ISO 14001 certificates. API certification is available on request.

Applications

Danfoss PAHT pumps are specifically designed for use with technical water such as:

• Ultra-pure water that has undergone multiple reverse osmosis processes.
• De-ionized water.
• Demineralized water.

Application examples include:

• High-pressure cleaning with ultra-pure water in manufacturing (e.g., flat-panel displays, electronics, automobile parts).
• Adiabatic cooling systems.
• Humidification in office buildings, electronic component manufacturing, dairies, and greenhouses.
• Dust suppression and odor control systems (e.g., in paper, textile, and wood production).
• Reduction of NOx emissions in diesel engines and gas turbines.
• Gas turbine by inlet fogging and fuel wash systems.

Operating Limits

PAHT 2-12.5 Series

• Housing material: AISI 304
• Geometric displacement: 2 to 12.5 cm³/rev (0.12 to 0.76 in³/rev)
• Min. outlet pressure: 30 barg (435 psig)
• Max. outlet pressure: 100 barg (1450 psig) for PAHT 2, 3.2, 4, 6.3; 140 barg (2031 psig) for PAHT 10, 12.5
• Inlet pressure, continuous: 0-4 barg (0-58 psig)
• Max. inlet pressure, peak: 4 barg (58 psig) (1% per minute peak, 10% per minute during start up)
• Min. speed: 1000 rpm
• Max. speed: 3000 rpm for PAHT 2, 3.2, 4, 6.3; 2400 rpm for PAHT 10, 12.5
• Media temperature: 2-50 °C (37-122 °F)
• Ambient temperature: 0-50 °C (32-122 °F)
• Sound pressure level: 76 dB(A) for PAHT 2, 3.2, 4, 6.3; 75 dB(A) for PAHT 10, 12.5
• Weight: 4.4 kg (9.7 lbs) for PAHT 2, 3.2, 4, 6.3; 7.7 kg (17.0 lbs) for PAHT 10, 12.5

PAHT 20-32 Series

• Housing material: AISI 316 or higher
• Geometric displacement: 20 to 32 cm³/rev (1.22 to 1.95 in³/rev)
• Min. outlet pressure: 30 barg (435 psig)
• Max. outlet pressure: 100 barg (1450 psig) for PAHT 20; 160 barg (2321 psig) for PAHT 25, 32
• Inlet pressure, continuous: 0-6 barg (0-87 psig) (Above 1800 rpm inlet pressure 2-6 barg)
• Max. inlet pressure, peak: 20 barg (290 psig) (1% per minute peak, 10% per minute during start up)
• Min. speed: 700 rpm
• Min. speed, continuous: 1000 rpm
• Max. speed: 2400 rpm
• Media temperature: 2-50 °C (37-122 °F)
• Ambient temperature: 0-50 °C (32-122 °F)
• Sound pressure level: 79 dB(A)
• Weight: 19 kg (42 lbs)

PAHT 50-90 Series

• Housing material: AISI 316 or higher
• Geometric displacement: 50 to 90 cm³/rev (3.05 to 5.49 in³/rev)
• Min. outlet pressure: 30 barg (435 psig)
• Max. outlet pressure: 80 barg (1160 psig) for PAHT 50; 160 barg (2321 psig) for PAHT 63, 70, 80, 90
• Inlet pressure, continuous: 0-6 barg (0-87 psig)
• Max. inlet pressure, peak: 20 barg (290 psig) (1% per minute peak, 10% per minute during start up)
• Min. speed: 700 rpm
• Min. speed, continuous: 1000 rpm
• Max. speed: 1800 rpm
• Media temperature: 2-50 °C (37-122 °F)
• Ambient temperature: 0-50 °C (32-122 °F)
• Sound pressure level: 80 dB(A) for PAHT 50, 63, 70, 80; 81 dB(A) for PAHT 90
• Weight: 34 kg (75 lbs)

PAHT 256-308 Series

• Housing material: AISI 316 or higher
• Geometric displacement: 256 to 308 cm³/rev (15.6 to 18.8 in³/rev)
• Min. outlet pressure: 30 barg (435 psig)
• Max. outlet pressure: 120 barg (1740 psig)
• Inlet pressure, continuous: 2-6 barg (29-87 psig)
• Max. inlet pressure, peak: 15 barg (218 psig) (1% per minute peak, 10% per minute during start up)
• Min. speed: 450 rpm
• Min. speed, continuous: 700 rpm
• Max. speed: 1250 rpm
• Media temperature: 2-50 °C (37-122 °F)
• Ambient temperature: 0-50 °C (32-122 °F)
• Sound pressure level: 82 dB(A) for PAHT 256; 87 dB(A) for PAHT 308
• Weight: 105 kg (231 lbs)

Feed Water

• Filtration: Proper filtration is crucial for performance, maintenance, and warranty. The main filter must have a filtration efficiency of 99.98% at 10 μm. Precision depth filter cartridges rated 10 μm abs. β10 ≥ 5,000 are strongly recommended. Bag filters or string-wound filter cartridges are not recommended.
• Inlet Pressure: Pump inlet pressure must be maintained according to specifications in the technical data to eliminate the risk of cavitation and other pump damage.

Mechanical / Hydraulic

• Flow: Typical flow curves at maximum pressure are available in Section 5 of the official PDF. The effective flow (Q eff) can be calculated using the equation: Q eff = Q (th) – [(Q (th) – Q (p max)) x (p / p max)].
• Dimensions and Connections: Detailed dimensions and connection diagrams are available in Section 8 of the official PDF.
• Installation: Pumps can be installed horizontally or vertically. Do not add any axial or radial loads to the pump shaft. Flexible hoses are recommended over metal pipes to minimize vibrations and noise. A non-return valve should be installed after the outlet to prevent pump backspin, and a pressure relief valve should be installed to prevent system damage.

Electrical

• Motor Requirements: 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):
  • PAHT 2, 3.2, 4, 6.3: 0.8
  • PAHT 10, 12.5: 0.9
  • PAHT 20, 25, 32, 50, 63, 70, 80, 90: 0.95
  • PAHT 256, 308: 0.95
• Typical motor sizes (kW for 50 Hz, hp for 60 Hz) and torque values (Nm, lbf-ft) are provided in the technical data tables for each pump series.

Service

Danfoss PAHT pumps are designed for long service-free operation, typically 8,000 hours between service when installed and operated according to Danfoss specifications. Poor filtration is identified as the number one cause of pump damage. Other factors affecting pump performance and lifetime include running the pump at speeds, media temperatures, or inlet/outlet pressures outside specifications. An inspection after 8,000 hours of operation is recommended, with replacement of worn parts like pistons and shaft seals as necessary.

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 on the project.

Official datasheet (PDF)

Lenntech datasheet mirror