DPHM Horizontal centrifugal pumps

Summary

Product identification

The DPHM(C) series are horizontal multi-stage centrifugal pumps designed for pumping clean or slightly aggressive, watery mediums. They are available in series DPHM(C) 2, 4, and 6, operating at 50 Hz or 60 Hz.

Model Key Example: DPHMC 2/2 B

• 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
• 2: Size (Flow in m³/h at Qopt)
• /2: Number of stages
• B: Design version B

Applications

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

Operating limits

• Ambient temperature: -20 up to 40 °C
  • Note: Avoid freezing the pump. If ambient temperature exceeds this value or the motor is located more than 1000 m above sea level, motor cooling may be less effective and could require 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
  • Note: Pumps intended for 50 Hz operation may not be connected to 60 Hz power supply.
• Maximum number of starts: See motor data sheet
  • Note: Frequent start/stops, particularly with higher pressure differences (∆p), may result in a shortened product lifetime.
• Noise emission: See motor data sheet
  • Note: Only the noise emission of the motor is documented.

Feed water

• Viscosity: 1-100 cSt
  • Note: Deviation in viscosity and/or density could require adapted motor power.
• Density: 1000-2500 kg/m³
• Medium: Clean or slightly aggressive, watery mediums.

Product water

To prevent overheating, gas gathering, cavitation, etc., a minimum flow must be secured.

Minimum/Maximum Flow (Qmin/max) at 20 °C

• 50 Hz Operation:
  • Pump size 2: Qmin 0.2 m³/h, Qmax 3.3 m³/h
  • Pump size 4: Qmin 0.4 m³/h, Qmax 6.5 m³/h
  • Pump size 6: Qmin 0.6 m³/h, Qmax 9.0 m³/h
• 60 Hz Operation:
  • Pump size 2: Qmin 0.2 m³/h, Qmax 4.0 m³/h
  • Pump size 4: Qmin 0.5 m³/h, Qmax 7.8 m³/h
  • Pump size 6: Qmin 0.8 m³/h, Qmax 10.8 m³/h

Electrical

Motor Specification - General Data

• Mounting type: Close coupled
• Motor standard: IEC 60034-7
• Duty class: S1
• Insulation class: F
• Motor finish: RAL5002
• Motor protection: Included (only for single-phase motors)
• Protection class: IP55
• VFD allowance: Yes (only for three-phase motors)

Motor Data (2 poles)

• Rated power output: Ranges from 0.37 kW to 1.5 kW (50 Hz) and 0.37 kW to 2.2 kW (60 Hz).
• Rated voltage: Available in 1x230 V and 230/400 V configurations.
• Rated speed: Ranges from 2750-2900 rpm (50 Hz) and 3300-3480 rpm (60 Hz).
• Tolerance rated voltage: Typically ±10%, with some 60 Hz 230/400 V models having -5%/+20%.
• Maximum starts per hour: 20 for all listed models.
• Sound pressure: Ranges from 56-58 dB(A) (50 Hz) and 58-78 dB(A) (60 Hz).
• Rated current, Starting current (Ia/In), Cos Phi, Motor efficiency: Varies significantly by specific model and frequency. See the official PDF for exact tabulated values.

Mechanical / hydraulic

• Hydraulic parts: All made of stainless steel.
• Pump casings:
  • DPHMC: Cast iron (JL 1040 / GJL-250 / A48 - 40B)
  • DPHM: Stainless steel (1.4308 / GX5CrNi 19-10 / A743 - CF8)
• Connections:
  • Suction: G 5/4
  • Discharge: G1
• Measuring, Draining, and Venting:
  • Connection (E) for filling the pump or measuring inlet/suction pressure (G¼).
  • Connection (F) for draining the pump or measuring discharge pressure (G¼).
  • This horizontal multi-stage pump is not self-venting; it must be vented on the pressure side to prevent serious damage.
• Materials (Key Components):
  • Hydraulics (Stage casing, Impeller, Cover): 1.4301 (X5CrNi 18-10 / A276 - 304)
  • Shaft (motor shaft): 1.4541 (X6CrNiMoTi 18-10 / A276 - 321)
  • Elastomers:
    • DPHMC: NBR
    • DPHM: EPDM
  • Mechanical Seal (DPHMC): Spring loaded ring Carbon graphite (Ca), Seat ring Ceramic (Ce), Elastomers NBR, Spring CrNi steel, Other metal parts CrNi steel.
  • Mechanical Seal (DPHM): Spring loaded ring Carbon graphite (Ca), Seat ring Ceramic (Ce), Elastomers EPDM, Spring CrNi steel, Other metal parts CrNi steel.
• Dimensions and Mass: Dimensions (E1, E2, F1, F2) and mass vary significantly across pump types, sizes, power ratings, and number of stages. 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 original OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror