NSL Centrifugal Pump

Vertical In-line Centrifugal Pump
Up to 1800 m³/h (7900 US gpm)

 

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The NSL range of pumps represents high efficiency, low NPSH values, easy to install and low maintenance. The NSL series is widely used within different applications and markets.

Applications

Within the Marine industry the pumps are suitable as:

  • Fresh and seawater cooling pumps
  • Bilge and ballast pumps
  • Fire-fighting
  • General service pumps
  • Transport of slightly aggressive liquids with low viscosity such
    as diesel and lubricating oils.

 

Within Industrial and utility applications the pumps are suitable for:

  • Industry water circulation
  • Cooling tower distribution
  • Diesel transfer
  • District heating
  • District cooling

Within Aquaculture industry the pumps are suitable as:

  • Freshwater
  • Water with additives
  • Seawater
  • Oils up to 500 cSt

 

RAS Applications:

  • Oxygen Control
  • Intake Water Pumps
  • Cooling/Heating Pumps

The DESMI NSL pump meets the requirements for:

  • High efficiency
  • Low NPSH values
  • Easy installation/service
  • Specific materials
  • Compact design
  • Standardized to modular design
  • Outstanding hydraulic design performance
  • Spacer-coupling options for easy maintenance
  • Robust shaft design
  • High efficiency impeller with low NPSH values
  • Self-priming ability with a separate built-on priming pump
Technical Product Specifications

The design of the NSLV-R/NSLH-R pumps is for medium/high flow capacities up to 6,200 m³/h (27,300 US GPM) & medium head up to 200mLC. The pump may be configured as vertical or horizontally. Both versions are radially split, single stage centrifugal pumps with connecting flanges according to international standards. The design of the pump includes mounting with electric motors having different international flange dimensions.

Materials for pump casings can be grey cast iron (GG20) or ductile cast iron GGG40 EN1561-GJS-400 for fresh water. GGG40 pumps can manage working pressures up to 25 bar (i.e. 37.5 bar test pressure). For seawater applications, the pump construction of the casing may be NiAlBz EN1982 CC333G or Super Duplex 1.4410 (~SAF 2507).

The pump casing is equipped with a NiAlBz or Super Duplex replaceable sealing ring. Material of the shaft is high quality duplex stainless steel AISI329/1.4460 or Super Duplex.

The pump is fitted with dynamically balanced impellers acc. to ISO21940/1-2019G 6.3 (G2.5 or G1.0 are optional) that incorporates advanced double-curved blades to ensure low NPSHr values and high efficiency resulting in lower energy consumption and therefore lower running costs.

 

Standard impeller materials are NiAlBz or Super Duplex (e.g. for Scrubber applications).

The pump is fitted with a variable pitch inducer mounted on the pump shaft end in suction port to prevent cavitation bubble development on the impeller blades. With inducer the pump can be operated at a higher speed and/or in lower NPSHa applications than a pump without inducer. The inducer material is stainless steel AISI 316 (~1.4436) as standard.

The mechanical shaft seal is a single acting, mechanical shaft seal. The pump can be used for liquid temperatures up to 250°F/120°C. For liquid temperatures above 250°F/120°C a balanced shaft seal design is used.

Nominal diameter (DN) 80 to 350
Flow rate - 50 Hz Up to 2000m³/h (8800 US gpm)
Flow rate - 60 Hz Up to 2400m³/h (10600 US gpm)
Head Up to 195 m (640 ft)
Pressure Up to 25 bar (360 psi)
Temperature Up to 140°C (284°F)
Motor Standard and EX motors
VFD Direct or Bulkhead/Wall-mounted
ATEX approved Yes

 

NSL Centrifugal Pump

NSL Centrifugal Pump (Monobloc) - overhaul video

DESMI Overhaul video NSL Centrifugal Pump NSL 200 265 14

Download Brochures

NSL (Marine)

English
  • English
  • American
  • Dutch

NSL (Industry)

English
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  • Danish
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  • French
  • American
  • German

NSL (Utility)

English
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Download Manuals

NSL Monobloc & Spacer (T1542)

English
  • English
  • Danish
  • Polish
  • French
  • Swedish

NSL Monobloc (T1380)

German
  • German
  • French
  • Swedish
  • Russia

NSL Spacer (T1379)

German
  • German
  • French
  • Swedish
  • Russia

NSL Compact Spacer (T1479)

English
  • English
  • Danish
  • German
  • French
50 Hz

PDF

 

 960 RPM  1450 RPM  2950 RPM


 

JPG

 

 960 RPM  1450 RPM  2950 RPM


 

60 Hz

PDF

 

1152 RPM  1740 RPM  3540 RPM


 

JPG

 

 1152 RPM 1740 RPM 3540 RPM


 

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Selection programs

Find curves for existing pumps, get GA drawings for initial designs and compare efficiency, motor power, NPSH and other data to find the right pump.

DESMI Centrifugal Pumps

The range of centrifugal pumps is made to meet the requirements of a wide array of different applications. Be it district heating, cooling, HVAC, fire-fighting or perhaps pumps for the engine room of a maritime vessel, a centrifugal pump is often the ideal choice.

DESMI's centrifugal pumps are characterised by high-level efficiency and low NPSH values. Our vertical pumps require minimal space and provide easy access for maintenance of the pump's rotating parts.

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