DPNL In-line centrifugal pump

Summary

Product identification

The DPNL series are vertical single-stage, non-self-priming centrifugal in-line pumps manufactured by DP-Pumps. They feature a "Back Pull Out Design" allowing for impeller, shaft, and other rotating parts to be removed without disconnecting suction and delivery pipes. The pumps are close-coupled to the motor with a rigid coupling.

They are designed for use in:

• Water networks and pressurization facilities
• Irrigation, sprinkling, and drainage systems
• Filling and draining of tanks and reservoirs
• Hot and cold water circulation in heating and cooling systems
• Condense water pumping
• Water circulations in pools
• Health and purification facilities
• Industrial and social facilities
• Fresh and sea water pumping in ships

The pumps comply with DIN 24255 standards within their nominal capacity range and are declared in accordance with EN 809/A1, Machine Directive 2006/42/EC, EMC Directive 2004/108/EC, and Ecodesign Directive 2009/125/EC (Regulation 547/2012 for water pumps with a maximum shaft power of 150 kW).

Operating limits

• Liquid Temperature: Up to 90°C
• Discharge Pressure: Must not exceed 10 bar (special order required for higher pressures)
• Ambient Temperature: If the local ambient room temperature exceeds +40°C, suitable ventilation must be provided.
• Minimum Efficiency Index (MEI): See pump label. The reference value MEI for a water pump with the best efficiency is 0.70. MEI refers to the full impeller diameter.
• Warranty: 24 months after delivery.

Feed water

The pumps are intended for liquids that are clean or mildly impure, non-abrasive, and do not contain large solid particles or fibre.

• Density: Performance curves are valid for water with a density (ρ) of 1 kg/dm³.
• Viscosity: Performance curves are valid for water with a viscosity (ν) of 1 cst.
  • For liquids with different densities and viscosities, consult DP-Pumps.

Electrical

The pump group is driven by a hermetic, 3-phase, totally enclosed, fan-cooled, squirrel-cage, IM 3611 V 18 type electrical motor, complying with DIN EN 60034-1, IEC, and VDE standards.

• Isolation Class: F
• Protection Class: IP 54-IP 55
• Frequency: 50 Hz
• Running Type: S1
• Start-up Type:
  • 3x380 V(Y) up to 4 kW
  • More than 4 kW, 3x380(Δ) + (Y/Δ)
• Motor Connection Diagram (U (Volt)):
  • 230/400V (Delta)
  • 400V (Star)
  • 3 x 230V (Delta)
  • 3 x 400V (Delta)
• Motor Protection: A thermic or thermic-magnetic relay, adjusted to the nominal current of the motor, should be used for protection against overcharging and short circuit.

Mechanical / hydraulic

• Pump Type: Single stage, in-line volute type pumps.
• Suction Flange: DN 40-DN 250, DIN 2533-PN 16
• Discharge Flange: DN 40-DN 250, DIN 2533-PN 16
• Capacity: 2-700 m³/hour
• Head: 2-70 m
• Speed: 900-3600 rpm
• Impeller: Closed radial type, dynamically balanced. Thrust (axial force) balanced with back wear ring and balance holes.
• Bearings: Rolling bearings are not used; motor bearing is sufficient for axial and radial forces and is provided with lifelong heat-resistant grease.
• Seals: Various mechanical seal types (e.g., bellow type, spring actuated type) are used for sealing. Mechanical seals are leak-proof and require less maintenance.
• Coupling: Clamped type rigid coupling with a coupling guard provided in accordance with EN 294.
• Shaft Runout: Maximum allowable shaft runout is 0.05 mm.
• Noise Level (Sound Pressure Level (dB) measured at 1m):
  • Motor Power PN (kW) / 1450 rpm/min / 2900 rpm/min
  • < 0.55 / 63 / 64
  • 0.75 / 63 / 67
  • 1.1 / 65 / 67
  • 1.5 / 66 / 70
  • 2.2 / 68 / 71
  • 3 / 70 / 74
  • 4 / 71 / 75
  • 5.5 / 72 / 83
  • 7.5 / 73 / 83
  • 11 / 74 / 84
  • 15 / 75 / 85
  • 18.5 / 76 / 85
  • 22 / 77 / 85
  • 30 / 80 / 93
  • 37 / 80 / 93
  • 45 / 80 / 93
  • 55 / 82 / 95
  • 75 / 83 / 95
  • 90 / 85 / 95
  • These are maximum values, measured without a protective sound hood, at a distance of 1 m directly above the driven pump, in a free space above a sound reflecting surface. The surface noise pressure level in dB(A) complies with TS EN ISO 20361.
• Pump Dimensions and Weights: See the official PDF for exact tabulated values.

Spare Parts

Recommended spare parts for two years of operation, depending on the number of equivalent pumps in the installation:

• Shaft (key included): 1 for 1-3 pumps, 2 for 4-7 pumps, 3 for 8-9 pumps, 30% for 10+ pumps.
• Impeller: 1 for 1-4 pumps, 2 for 5-7 pumps, 3 for 8-9 pumps, 30% for 10+ pumps.
• Mechanical Seal: 1 for 1 pump, 2 for 2-4 pumps, 3 for 5-7 pumps, 4 for 8-9 pumps, 50% for 10+ pumps.
• Wear Ring: 1 for 1-4 pumps, 2 for 5-7 pumps, 3 for 8-9 pumps, 50% for 10+ pumps.
• Rigid Clamped Coupling: 1 for 1 pump, 2 for 2-4 pumps, 3 for 5-7 pumps, 4 for 8-9 pumps, 50% for 10+ pumps.

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

Official datasheet (PDF)

Lenntech datasheet mirror