NSLV-R & NSLH-R Centrifugal Pump with Inducer

End suction centrifugal pump with inducer.
Up to 6,200 m³/h (27,300 US gpm)




The DESMI NSLV-R & NSLH-R pumps are designed for vertical and horizontal mount and meets the special marine and industrial market requirements.

Marine & Offshore:

  • Condensate & Drain Transfer
  • Seawater Supply & Cooling
  • Bilge & Ballast
  • Main & Emergency Firefighting 
  • Water Spray & Deluge Firefighting
  • Foam Firefighting


  • Agriculture Irrigation
  • Condensate & Drain Transfer
  • Desalination & Water Treatment
  • Main & Emergency Firefighting
  • Water Spray & Deluge Firefighting
  • Foam Firefighting

The pumps are particularly suitable for the pumping of water in connection with various firefighting systems, water supply and drain system when extremely low NPSHr is required as firefighting pump, bilge and ballast pumps, pumps for irrigation, water works, army and navy, etc.


Within the marine industry the pumps are suitable as seawater supply and cooling pumps, bilge and ballast pumps, firefighting and general service pumps, and further for transport of slightly aggressive liquids with low viscosity such as diesel and lubricating oils. Further, the pumps can be supplied in a special version for pumping brine and similar media.


The DESMI NSLV-R & NSLH-R pumps is known for their:

  • High efficiency
  • Low NPSHr 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
  • 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) 65 to 600
Flow rate 50 - Hz Up to 6200m³/h (27300 US gpm)
Flow rate 60 - Hz Up to 5900m³/h (26000 US gpm)
Head Up to 200 m (660 ft)
Pressure Up to 25 bar (360 psi)
Temperature Up to 140°C (284°F)
Motor Standard and EX motors
VFD Direct or Wall-mounted
ATEX approved Yes




Selection programs

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NSLV-R & NSLH-R Centrifugal Pump with Inducer

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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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