Screwpumps

The international requirements for the operational reliability of ships and machines in the shipbuilding and marine sector as well as the general conditions and limitations regarding energy efficiency and the emission of pollutants are constantly increasing. Leistritz has already been meeting these rising requirements for decades. High-quality products and the globally unique range of different types of screw pump designs offer the corresponding sustainability.

Robustness and production quality as well as long service lives and availability are the attributes which have always been associated with Leistritz screw pumps on the market. In order to be able to guarantee and document a consistent product quality, each Leistritz screw pump is thoroughly tested under the specified operating conditions on our test stands. During the course of the pump testing process, a factory 3.2 testing certificate in accordance with DIN EN 10204 can be delivered, as well as approval certificates as required for all notable ship class companies such as DNV, GL, ABS, BV, LRS, RINA and more.

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L3N screw pumps

Leistritz screw pumps in the L3N range are three-spindle, single-volute, self-priming displacement pumps for the low-pressure range. They are used to transport non-abrasive lubricating fluids.

L3NG

Foot, flange-mounted or pedestal pump versions available.
Predominantly used for diesel and heavy fuel oil applications in shipbuilding.

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L3NX

Corresponds to the dimensions of standardized chemical pumps (geometry in accordance with DIN EN ISO 2858)
Significantly higher efficiency η in comparison with other pump types
Drive shaft sealing through magnetic coupling (compliant with the German Clean Air Act)
Wetted parts made from stainless steel

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L3NT

Space-saving installation in the tank.
No suction or NPSH problems. Use as a primary lubricating oil pump for marine diesel engines.

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L3M screw pumps

Leistritz screw pumps in the L3M range are three-spindle, single-volute, self-priming displacement pumps for the medium-pressure range. They are used to transport non-abrasive lubricating fluids.

L3MG

Cased pumps with changeable insert.
Flange-mounting in accordance with DIN or ANSI available.
Welded version with individual flange arrangements and heating system option.

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L3MF

Flange-mounted pump with SAE connections.
Simple and robust design.
Suction connection turnable to 90° each way (model without circulation valve only).

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L3MA

Lubricating oil pump in accordance with API 676.
Drive shaft sealed with cartridge sealing (optional).
Suitable for lubricating oil systems in accordance with API 614.

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L3MW

Use as an emulsion pump for machine tools
Horizontal installation or space-saving installation in the tank

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Cargo application

A wide variety of specialized vessels are generally used for the transportation of liquid freight on inland and shipping routes. In order to be able to safely load and unload the freight, these ships must be adapted for the specific storage and transport features. The same applies for the pumps which are used here. They have to ensure reliable and safe operation for a wide range of viscosities, temperatures and other operating conditions and influences. Here, Leistritz screw pumps offer optimal volume stability, robustness and operational reliability for almost all liquid freight goods and products.

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L4 screw pumps

Leistritz screw pumps in the L4 range are twin-screw, double-volute, self-priming positive displacement pumps. They are used to pump aggressive / non-aggressive, abrasive / non-abrasive low to high-viscosity fluids with lubrication / non-lubrication properties.
Spindles (shaft/rotors) manufactured in one piece > Low rotor deflection and non-contacting design.
Arrow-toothed gears > Reduced noise level and low-maintenance.
Replaceable insert > Low-maintenance.
Special spindle geometry > Minimized pulsation and optimized NPSH value.
Wide range of shaft seals > Customer-specific seals (single-acting, double-acting, API plans).

L4NG / L4MG / L4HG

Cased pumps with replaceable insert.
Flange-mounting in accordance with DIN or ANSI available.
Welded version with a variety of flange arrangements and heating system options.
Single-acting or double-acting mechanical seals available (as well as cartridge seals).
Suitable for use for multi-phase applications to a limited extent – gas contents up to 30 %.
Pumping of non-Newtonian fluids.
Stainless steel version available.
External heating available.
High temperature version available.

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Compact pumps L4NC and L4NO

Compact one-piece housings > Cost and weight reduction
Special geometries > High flow rates
Optimized sizes > Finer quantity gradations
Spindles (shaft/rotors) manufactured in one piece > Low rotor deflection and low bearing load
Gears & ball bearings oil-lubricated > Longer service life and maintenance intervals

L4NC

The new compact screw pump design for the oil and gas industry from the extraction of crude oil through to processing.
With its compact design, our newly developed L4NC can be used in a wide range of areas of the oil and gas industry, at tank farms, in shipbuilding and offshore technology, and in the chemical and petrochemical industry.
Helical toothed gears.
API 676 compliant.
Pressure range up to 25 bar.
Solutions adapted precisely for the operating requirements thanks to a wide variety of spindle diameters and pitches.

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L4NO

Leistritz screw pumps in the L4NO range are used as loading and unloading pumps and are self-priming positive displacement pumps for the low-pressure range up to a maximum of 16 bar and are designed for the pumping of lubricating and non-lubricating fluids without/with abrasive properties.

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For more Information please visit: www.leistritz.com