L2 Series Screw Pumps – Leistritz

Leistritz L2 screw pumps are self-priming, positive displacement pumps that go to a pressure range of up to 250 psi.

Self-priming screw pump with two spindles. The double-threaded main spindle rotates hermetically sealed with the triple-threaded idler spindle in the spindle holes drilled into the pump casing, which encloses the spindle set with small tolerances, but without any contact.

Sealed areas are formed through the special spindle shape, and their enclosed volumes are moved continuously by rotation in an axial direction from the pump suction port to the pump discharge port without turbulence and squeezing of the pumped fluid. The drive- and the idler spindle are mounted in interchangeable bearing bushes on both sides so that the spindles do not touch the spindle bore as long as the maximum delivery pressure of 16 bar is observed.

Thus wear as a result of metallic contact between the casing and the spindles is avoided. All four bearing points simultaneously form choke points between the inlet and delivery chambers and thus are always subject to the differential pressure of the pumped fluid. This guarantees good lubrication of these bearing seats and ensures adequate removal of the heat produced by the friction.

Also the Leistritz Screw Pumps, series L2, are of hydraulically balanced design, which means the axial force on the spindles as a result of the produced discharge pressure
is hydraulically compensated through internal drillings in the pump housing.

Technical Advantages L2 Series Screw Pumps

Optimized Total Cost of Ownership (TCO)

Leistritz screw pumps of the L2NG series need only one mechanical seal and one bearing. This leads to considerable advantages compared to external time-geared, double volute twin-screw pumps, which need four (4) seals and four (4) bearings, such as:

↗ Reduced purchasing costs (CAPEX) by a compact design and only one seal/bearing
↗ Reduced service costs (OPEX) with less number wear parts
↗ Less mechanical losses increase the efficiency and lower the power consumption up to 20%

Flexible Sealing Solution

L2 pumps from Leistritz can be equipped with standard component seals or cartridge seals in line with API 682 latest edition. Depending on the product to be pumped, single or double-acting seals together with buffer-, barrier or quench systems can be used.

Simple and easy maintenance

Not only the need for only one seal makes this pump series very service friendly. The design itself, with a noticeably reduced number of parts compared to double volute twin screw pumps ensure an extremely short downtime for service activities.

Leistritz L2 design does not require any gearbox, timing gears, liners or clamping devices. Easy and fast dismantling and re-assembly increases availability and keeps the life cycle costs as low as possible.

Detailed specifications of each model of L2 Series Screw Pumps – Leistritz

L2NG STANDARD PUMP

Leistritz screw pumps of the L2NG series, are self-priming positive displacement pumps for a pressure range up to 16 bar (232 psi), suitable for the transport of light abrasive and corrosive, high or low viscous fluids with poor or good lubricity.

> Designed according to military rules like BV 043/044
>> Pump design to withstand high shock loads
>> Customer orientated solutions
>> Installation of shock dampers
>> Detailed stress- calculation of flanges and connections
>> Electric driven as pre lube oil pump
>> Directly flanged on gear boxes, motors or turbines

L2NT SEMI SUBMEGED PUMP

Leistritz screw pumps arranged as the vertical submerged pumps can be installed e.G. Inside barrel with suction piping between the tanks of the asphalt carrier. Cargo of nearly all viscosities – from kerosene to asphalt – can be unloaded and effectively stripped from tanks and suction lines.

> Space-saving installation in the tank
>> No suction or NPSH problems
>> Use as a cargo pump or primary lubricating oil pump in shipbuilding

Specification of L2 Series Screw Pumps

Leistritz screw pumps in the L2 range are twin-screw, single-volute, self-priming positive displacement pumps for the low-pressure range. They are used to pump slightly aggressive, slightly abrasive, low to high-viscosity fluids with good to poor lubrication properties.

Applications L2 Series Screw Pumps

The L2 Leistritz screw pumps are designed to serve a wide variety of applications in industrial environments. The most typical can be mentioned as:

To get advice more suitable for your needs, contact TKP immediately to choose the right L2 Leistritz screw pump that you need!

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