DPV and DPHSI Low NPSH brochure

Summary

Product identification

This document describes low-NPSHr (Net Positive Suction Head required) versions of DP Pumps DPV and DPH(S)I series.

The low NPSHr option is available for:

• DPV (C/S) and DPH(S)I 2, 4, 6, 10, and 15 models
• Available for both 50 Hz and 60 Hz applications

Specific models referenced include DPV 10 B Low NPSHr and DPV 15 B Low NPSHr.

Features and Benefits

The low-NPSHr design aims to prevent cavitation and pump failure, ensuring quiet and long-lasting smooth pumping. Key features include:

• Specially designed low NPSHr impeller and bottom stage casing
• Significant lower NPSHr values
• Extends low NPSHr performance to higher flows, where conventional pumps typically see a sharp increase in NPSHr
• No increased motor power requirements, due to efficient rimming of the low NPSHr components
• A pump with a Low NPSHr impeller has the same height as the standard version, allowing for easy exchange.

Applications

The low NPSHr design allows the pump to be used in a wider range of applications where low suction pressure and/or high vapor pressure of the liquid normally cause problems, such as:

• Hot water (Boiler feed)
• Feed from a (low) reservoir
• Limited space between the deaerator tank and the pump
• When no vented tanks are available

Mechanical / hydraulic

The unique low NPSHr impeller design differs from standard impellers in several ways:

• Inlet diameter of the impeller is larger
• The impeller opening height is increased
• Impeller base plate has been reinforced
• Modified vane design
• Total height of the impeller is larger, compensated by an adjusted bottom casing

Extended CFD calculation models have resulted in a design with lower fluid velocities at the core of the impeller.

Performance Data

Performance curves are provided for DPV 10 B Low NPSHr and DPV 15 B Low NPSHr models, indicating:

• Density: 1000.0 kg/m³
• Rotational speed: 2900 rpm

These curves illustrate Flow (m³/h, US.gpm, IM.gpm, l/s) against Total Dynamic Head (TDH) (m, ft) and NPSH₃% (m, ft) for both standard and low NPSHr configurations. See the official PDF for exact tabulated values and detailed performance curves.

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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