DPHM Horizontal centrifugal pumps

Summary

Product identification

The DPHM(C) series are horizontal multi-stage centrifugal pumps, available in sizes 2, 4, and 6, designed for 50 Hz and 60 Hz operation.

A model key example, DPHMC 2/2 B, indicates:

• DP: Product Label
• H: Horizontal
• M: All hydraulic parts Stainless Steel 1.4301 / AISI 304 with closed coupled motor
• C: Pump casing in cast iron (DPHM models feature a 1.4308 stainless steel casing)
• Connections: DIN connection size: suction G 5/4 - discharge G1
• 2: Size (Flow in m³/h at Qopt)
• /2: Number of stages
• B: Design version B

Operating limits

• Ambient temperature: -20 up to 40 °C (Avoid freezing the pump. For ambient temperatures exceeding this or altitudes >1000 m above sea level, motor cooling may be less effective, potentially requiring adapted motor power.)
• Fluid temperature: -10 up to 60 °C
• Pressure class: PN 10
• Minimum inlet pressure: NPSHreq. + 1 m
• Minimum frequency: 30 Hz
• Maximum frequency: 60 Hz (Pumps intended for 50 Hz operation must not be connected to a 60 Hz power supply.)
• Maximum number of starts: See motor data sheet (typically 20 starts per hour).

Feed water

The pumps are designed for pumping clean or slightly aggressive, watery mediums.

• Viscosity: 1-100 cSt (Deviation in viscosity and/or density may require adapted motor power.)
• Density: 1000-2500 kg/m³

Product water

Applications for the DPHM(C) series include:

• Domestic cold-water booster set
• Irrigation
• Chilled water circulation
• Light industrial applications

Electrical

• Motor type: Close coupled electric motor
• Motor standard: IEC 60034-7
• Duty class: S1
• Insulation class: F
• Motor finish: RAL5002
• Motor protection: Included (for single-phase motors only)
• Protection class: IP55
• VFD allowance: Yes (for three-phase motors only)
• Cooling: Forced motor cooling (Ensure free space behind the motor cooling fan is at least 1/4 of the fan inlet diameter for sufficient airflow.)

Specific motor data (rated power output, frame size, efficiency class, voltage, current, starting current, Cos Phi, tolerance rated voltage, rated speed, efficiency, sound pressure, cable gland, maximum starts per hour) are detailed in tables for single-phase and three-phase motors at 50 Hz and 60 Hz. See the official PDF for exact tabulated values.

Mechanical / hydraulic

• Pump type: Horizontal multi-stage centrifugal pump.
• Hydraulics: Based on high-efficiency hydraulics, meeting ErP for 2015 with Minimum Efficiency Index MEI >= 0.7.
• Connections: Suction G 5/4, Discharge G1.
• Measuring, draining, and venting: The pump is provided with G¼ plugs for filling/measuring inlet pressure (E) and draining/measuring discharge pressure (F). This horizontal multi-stage pump is not self-venting and must be vented on the pressure side to prevent serious damage.
• Minimum/Maximum Flow (Qmin/max):
  • 50 Hz:
    • Size 2: Qmin 0.2 m³/h, Qmax 3.3 m³/h
    • Size 4: Qmin 0.4 m³/h, Qmax 6.5 m³/h
    • Size 6: Qmin 0.6 m³/h, Qmax 9.0 m³/h
  • 60 Hz:
    • Size 2: Qmin 0.2 m³/h, Qmax 4.0 m³/h
    • Size 4: Qmin 0.5 m³/h, Qmax 7.8 m³/h
    • Size 6: Qmin 0.8 m³/h, Qmax 10.8 m³/h (To prevent overheating, gas gathering, cavitation, etc., a minimum flow must be secured. For higher temperatures, refer to the Qmin/Qoptimum vs. liquid temperature curve in the official PDF.)

Materials:

• Hydraulic parts: All hydraulic parts are made of stainless steel 1.4301.
• Pump casing:
  • DPHMC: Cast iron (JL 1040)
  • DPHM: Stainless steel (1.4308)
• Shaft (motor shaft): 1.4541
• Elastomers:
  • DPHMC: NBR
  • DPHM: EPDM
• Mechanical seal (Code acc. to EN 12756):
  • DPHMC (BVPFF): Spring loaded ring Carbon graphite (Ca) resin impregnated, Seat ring Ceramic (Ce) Aluminium oxide, Elastomers NBR, Spring CrNi steel, Other metal parts CrNi steel.
  • DPHM (BVEFF): Spring loaded ring Carbon graphite (Ca) resin impregnated, Seat ring Ceramic (Ce) Aluminium oxide, Elastomers EPDM, Spring CrNi steel, Other metal parts CrNi steel.
• Other key materials: Stage casing 1.4301, Impeller 1.4301, Spacer sleeve 1.4305, Tie bolt 1.4057, Nuts 1.4301, Safety device 1.4401, Circlip 1.4571, Wave spring 1.4401.

Detailed dimensions, mass, and article numbers for various pump configurations (e.g., DPHMC 2/2, DPHM 4/6) at both 50 Hz and 60 Hz are provided in tables within the official PDF. See the official PDF for exact tabulated values.

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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 complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror