NSL Centrifugal Pump

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

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

Nominal diameter (DN)	65 to 400
Flow rate	Up to 1800 m³/h (7900 US gpm)
Head	Up to 220 m (720 ft)
Pressure	Up to 25 bar (363 psi)
Temperature	Up to 150°C (302°F)
Motor	Standard and EX motors
VFD	Direct or Bulkhead/Wall-mounted
ATEX approved	Yes

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

The DESMI NSL pump meets the special marine and industrial market 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 NSL pumps is for medium/high flow capacities up to 1800 m³/h (to 7,900 US GPM) & medium head up to 220mLC. The pump can be configured as vertical and be of the radially split, single stage centrifugal pump type with connecting flanges according to international standards or as horizontal in-line and radially split, single stage centrifugal pump with connecting flanges according to international standards acc. to DIN, ANSI or JIS.

Material construction of the pump casings needs to be ductile cast iron GGG40 EN1561-GJL-400/DIN1693 for plain water, which shall be able to manage a working pressure of 16 bar (tested 1,5 x working pressure). For seawater applications, the pump construction of the casing shall be RG5 bronze EN1982 CC491K/DIN17656.

The pump casing shall be equipped with a NiAlBz EN1982 CC333G/DIN17656 replaceable sealing ring. Material of the shaft shall always be of high quality duplex stainless steel AISI329/1.4460. The pumps to be fitted with bearings at both top and bottom to give a robust construction, designed for trouble free continuous duty.

The pump needs to be fitted with dynamically balanced impellers acc. to ISO1940/1-1986 (E) G6.3 that incorporates advanced double-curved blades to ensure low NPSH-values and high efficiency resulting in lower energy consumption and therefore lower running costs.

The construction material of the impeller shall be NiAlBz EN1982 CC333G/DIN17656 (as standard) or duplex stainless steel AISI329/1.4460. The seal type shall be a single acting, mechanical shaft seal, which seals off the liquid cavity at the motor shaft.

The pump can be equipped with a spacer coupling, which is a combined distance and flexible coupling between drive unit and electric motor. This makes it possible to remove the complete bearing housing with shaft, bearings, shaft seal and impeller – without dismantling the motor or pump from the piping. This represent significant advantages to the end user, who with this pump solution secures his installation trouble free maintenance with minimum down time.

Videos

NSL Centrifugal Pump

NSL Centrifugal Pump (Monobloc) - overhaul video