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Innovative and flexible pumpingsystems contribute to a flexible,smooth and cost-efficient opera-tion of tank terminals.

Screw pumps are used to anincreasing extent to transfer storedoil products. The versatility of thetwin-screw pump gives a hugeadvantage in operating a tank ter-minal, in comparison to conven-tional centrifugal pumps.

The big advantage is that oil prod-ucts of various quality and viscosi-ty, with varying differential pres-sure and suction conditions, canbe pumped without any problemwith only one pump type. Withtank terminals getting bigger andbigger, resulting in longer pipe

runs, centrifugal pumps are a lim-iting factor.

Twin-Screw pumps provide a virtu-ally constant capacity over a wideviscosity and pressure range.

New Compact Screw PumpWith the release of the L4NC pumpseries, Leistritz Pumpen GmbH hasresponded to these market develop-ments and presents a new genera-tion of slim and economic rotarypositive displacement pumps.

This pump series, which was espe-cially designed for tank terminalapplications, covers a wide rangeof areas and can also be perfectlyused in the chemical, petrochemi-cal and shipping industry as load-

ing or unloading, stripping andbooster pump.

The basis of this series lies in theproven concept of Leistritz’s twin

screw pumps, which have been inuse for decades. The compactL4NC series is characterised by and complies with the API 676 3rd Edition.

P U M P D E V E L O P M E N T

Especially in times of unpredictable oil price fluctuations over the recent years, tank terminals are experiencing a boisterous development. All over the world new tank terminals have been built and moreare planned, to meet the growing demand for crude – and refined oil products. There seems to be noend in sight to this trend.

BY MANFRED WEISS

Low Oil PriceDrives ProductDevelopment at Leistritz

Keiyo tank terminal (photos: Leistritz Pumpen GmbH)

L4NC in a fully automatic milling centre Final assembling of spindles for L4NCQuality control for the L4NC pump casing

Leistritz L4NC pump

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The L4NC series is equipped with acasted steel casing with integratedpump liner and a side in – top-outarrangement with ASME or DINflanges. Leistritz has made no con-cession to its philosophy to manu-facture spindles from one piece ofmetal. Thus, they realise the con-cept with very low shaft deflection,resulting in a long service life ofbearings and shaft seals and ahigh efficiency.

The compact spindle length arearranged side by side to achievethe best possible lubrication of thebearings and timing gears.Moreover, the pumped media cansupport the spindles hydrodynami-cally to achieve the highest per-formance values, even withreduced pump sizes. Drive spindleand idler spindle are sealed byunbalanced or balanced, singleacting component or API cartridgeseals for easy maintenance. Sealmanufacturers, materials and the

detailed design are always selectedto match perfectly to the client’soperating conditions.

A wide range of L4NC pump sizescovers a flow rate up to 5000 m³/hand a differential pressure up to 20bar for various fluids such as crudeoil, bitumen, heavy and light fuel oil or other petrochemicalcompositions.

The series consists of seven pumpsizes, each with four pitch variants,offering an optimal selection perapplication.

With revealing the new and opti-mised L4NC pump, LeistritzPumpen GmbH creates a mile-stone in modern, efficient andcompact twin screw pump designwith reduced costs. This low capi-tal expenditure (CAPEX) combinedwith the high efficiencies and lowmaintenance work for optimisedoperational expenditure (OPEX)

are the results oflong-term devel-opment and wellfounded know-how. n

P U M P D E V E L O P M E N T

L4NC in tankfarm applications (illustration: Leistritz Pumpen GmbH)

On-Board crude oil cargo pumpCrude oil unloading pumpBooster pump

Crude and re�ned productCirculation pumpStripping pumpLoading and transfer pump

Oil �eldStorage tankBooster station

AB

B

B

C

Viscosity up to 10,000 mm2/s

Temperature up to 100 °C

Flow rate up to 5,000 m3/h

Suction pressure Cavitation limit up to 5 barg

Differential pressure up to 20 barg

Casing design pressure 25 barg

Speed up to 3,600 1/min

Operating conditions

The Author:Manfred Weiss is Sales and Marketing Manager at Leistritz.

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