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Our head office at the Raffelbergparkin Mülheim an der Ruhr

Our works premises in the industrial portin Mülheim an der Ruhr

Partial view of our workshopin Mülheim an der Ruhr

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SIEBTECHNIK-Decanter Centrifuges -tailored to the product.

Of all the machines operating on the centrifugalprinciple, the decanter is the most versatile centrifugewith the largest overall market share worldwide. In thelight of increasingly demanding requirements of theauthorities in respect of reducing the waste content ineffluent and the requirement of industry for maximumpossible efficiency of production plant, the decanter isgaining further importance.

In the planning of new plants or extensions of existingproduction plants, these criteria are always of primaryimportance. Whilst generally the trend is towardsstandardization, SIEBTECHNIK attach importance toproduction equipment tailored to the product.

This means that our specialists design and constructa suitable machine for and frequently in collaborationwith the customer for his specific application.

In this way, it is possible to achieve optimum product-specific efficiency and to meet individual requirements.

We are your partners!

Correct product-specific design of a decantercentrifuge involves a correspondingly wide range ofoptions according to the application - gastight or openprocess - as well as the properties of the product.

At the same time, variable drives and specialequipment options which affect production flowcostwise are the state of the art withSIEBTECHNIK decanter centrifuges.Reliability under all operating conditions is theguiding principle with SIEBTECHNIK decantercentrifuges and an inviolable obligation to theenvironment.

To suit the numerous applications and meetthe demands of the operator for efficiency ofthe machines, the machine must be preciselymatched physically, as well as in its operatingparameters, to the product to be processed.Here, we are assisted by existing operationalexperience or trials with test machines on siteor in the SIEBTECHNIK laboratory.

Here as well, we are assisted by computer inextrapolation to operating conditions andoptimum design of the operational machinewith regard to geometry of screw and drum,operating speeds and the resultant physicalconditions in comparison with the trial results.

Why not give us a try !

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Principle of operation

Even the finest solids can be separated in the decantercentrifuge if its sedimentation rate in the carrier liquidis sufficiently high. The sedimentation rate dependson the particle size, the particle shape, the densitydifference between solid and liquid, and the viscosityof the latter. In many cases, significant improvementis possible by conditioning, for example heating oraddition of flocculants. Also important is thegeometrical design and establishment of operatingparameters.

Clarification of the liquid is effected in the case of solidbowl centrifuges primarily in the cylindrical section,dewatering of the solid matter taking place by meansof filtration or compression of the solid cake in theconical section of the drum.

Design

SIEBTECHNIK decanter centrifuges operate on thecontraflow principle. This means that the suspensionto be separated is fed approximately in the centre ofthe drum, the sedimented solid matter is conveyedtowards the smaller diameter by the screw rotating ata speed differential in relation to the drum, whilst theclarified liquid overflows at the opposite end of thedrum.

The height of the liquid level in the drum and thus theratio of clarifying to drying section of the drum can beinfinitely varied. This permits optimum matching tothe separation application involved.

The speed differential between screw and drum iseffected by means of a CYCLO gear unit. Drive iseffected in standard form by V-belt, the centrifuge beingfitted, according to speed combination, with a singledrive (fixed eccentric shaft) or dual drive (driveneccentric shaft).

Versatility

SIEBTECHNIK decanter centrifuges can be used foralmost all separation processes:

Pure separation processes(clarification and dewatering of solids)

Compacting

Three-phase separation

Classifying

Decanter centrifuge (schematic diagram)

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According to its structural layout, the TS Series is usedin preference for gastight process systems, and theDZ Series for open plants.

The additional structural complexity of the TS Seriesjustifies the additional price.

The geometrical and equipment options listed aside,add up to provide a range of decanters with anunusually wide scope of options.

Basic typesTS Series (tunnel version)DZ Series (pedestal bearing version)

Drum lengthsDiameter/length ratio

1 : 1.5 1 : 2 1 : 3 1 : 4

Drum angle of inclination6° 8° 10° 12° 15°

Drive optionsSingle drive(fixed eccentric shaft)Dual drive(driven eccentric shaft)Hydraulic driveFrequency converter drive

SeparationTwo-phase decanterThree-phase decanter

Centrifuge effluent dischargeFree dischargeImpeller(discharge under pressure)Continuous sump adjustmentduring operation(patent applied for)

Solids dischargeFree dischargeDischarge device (racetrack)Slurrying trough (patent applied for)

Sealing systemsOpen labyrinth sealVapour-tight versionGastight version with chamberpacking with PTFE ringsPressure tight versionwith mechanical sealsDecanter in pressure vessel

Special designsCompressing decanterWashing decanterScreen decanterOverhung-mounted decanter(TS 140 F, TS 210 F, TS 250 F,TS 360 F)

Basic types and range of options

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SIEBTECHNIK DZ Decanters

The DZ Series can also be supplied as a vapourtightand gastight unit. The product housings are two-partthroughout and sealed with PTFE rings. The geometryof the rotating parts is specially matched to theseparation application involved.

For repairs and maintenance, we recommend anassembly bench as a valuable addition to the centrifugefor care and safe handling of the high-quality rotatingparts.

This SIEBTECHNIK heavy duty decanter is used inpreference for open process systems and isdistinguished by its outstanding separation propertieswith maximum availability.

As with all SIEBTECHNIK centrifuges, the ruggedCYCLO gear unit, as well as all the antifriction bearingsare connected to a circulating oil lubrication system.All the components are generously dimensioned andwill stand up to the most severe operating conditions.

This ensures maximum service life with minimummaintenance.

An overload protection system patented bySIEBTECHNIK which provides not only mechanicalpower disconnection, but also provides electricalsignals for shutoff of product feed and drive, completesthis Series and meets all safety requirements.

The housings are sealed as standard by a multi-chamber labyrinth system.

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Sizes available

Type DZ 1 DZ 2 DZ 3 DZ 4 DZ 5 DZ 6 DZ 7 DZ 8 DZ 10DZ 1E (L) DZ 2E (L) DZ 3E (L) DZ 4E (L) DZ 5E (L) DZ 6E (L) DZ 7E (L) DZ 8E (L) DZ 10E (L)

Drive motor appr. kW 5,5 - 11 10 - 22 18,5 - 30 18,5 - 45 22 - 50 30 - 90 45 - 110 55 - 160 120 - 200

Length DZ appr. mm 1750 1900 1955 2300 2750 2950 3300 3700 4365

Length DZE appr. mm 1700 2250 2315 2650 3200 3500 3935 4500 5365

Length DZL appr. mm 2000 2510 2675 3100 3750 4700 4720 5400 6365

Width DZ,DZE,DZL appr. mm 1140 1250 1450 1500 2000 1870 2160 2600 2760

Height DZ,DZE,DZL appr. mm 675 680 815 900 1080 1200 1450 1450 1620

Weight DZ appr. kg 850 770 1500 1650 2100 3500 5000 6500 12500

Weight DZE appr. kg 1100 1300 1650 1800 2500 3800 6500 8600 15000

Weight DZL appr. kg 1400 1700 1900 2100 3500 4100 8000 9700 17500

Subject to modification without notice.

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Series TS decanters are used in preference for gastightprocess systems. The continuous, undivided housing(tunnel construction), the tried and tested sealing ofthe shaft exits of the smallest diameters, as well asthe layout designed structurally for special operatingconditions, provide this centrifuge Series with anunusually high standard of safety.

As with all SIEBTECHNIK centrifuges, the gear unitand all the bearings are connected to the circulatingoil lubrication system, so that minimum maintenancecan be assured with maximum service life. Thegeometry of the rotating parts is specially matched tothe separation application involved.

SIEBTECHNIK T S Decanters

The TS Series is also fitted as standard with the patentoverload protection (see DZ Series) and thus fulfilsthe very highest safety requirements.

It goes without saying that all the options of theSIEBTECHNIK range are also applicable to this typeof centrifuge.

For industry and the environment -SIEBTECHNIK centrifuges !

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Gastight Version up to5000 mm WG process pressure

PTFE rings, butt-joint version: Inerting withsealing gas and grease seals to prevent leakageto atmosphere. Minimum gap.

PTFE rings, overlapping angle-cut version:Inerting with sealing gas, without additionalgrease seal, PTFE rings run pretensioned withconstant contact, without gap.

Pressure tight Version over5000 mm WG process pressure

Fitted with mechanical seals, complete withsupply systems.

In the case of extreme pressures and extremetemperatures with special safety requirement,installation of the decanter in a pressure vesselwithout shaft exit to atmosphere and thus withoutuse of mechanical seal systems. The centrifugeis fitted with a fully hydraulic drive unit.

Installation and removalof drum and screw, TS SeriesThe drum and screw of our TS Type decantercentrifuges are mounted in anti-friction bearings. Thebearing end shields are fixed to the torsionally rigidproduct housing. After releasing several screws, therotating parts can be moved horizontally out of thehousing with the aid of the rails provided and swivelledvertically.

Sizes available

Type 210 300 360 420 500 600 710 850 1000

Drive motor appr. kW 5,5 - 11 10 - 22 18,5 - 30 18,5 - 45 22 - 50 30 - 90 45 - 110 55 - 160 120 - 200

Length TS appr. mm 1400 1900 2020 2200 2650 2900 3300 3500 4570

Length TSE appr. mm 1700 2200 2380 2620 3150 3500 4010 4000 5370

Length TSL appr. mm 2000 2500 2740 3040 3650 4100 4720 5200 6570

Width TS,TSE,TSL appr. mm 1100 1370 1500 1750 2035 2060 2580 2700 3160

Height TS,TSE,TSL appr. mm 750 940 980 1110 1325 1400 1450 1600 1660

Weight TS appr. kg 900 1200 1500 2100 3000 4200 5000 7000 10000

Weight TSE appr. kg 1200 1400 1800 2450 3500 5000 6000 8300 12000

Weight TSL appr. kg 1400 1600 2100 2800 4000 5800 7000 9800 15000

Subjects to modification without notice.

Frequently, the drum remains in the housing and onlythe screw is removed for cleaning and inspectionpurposes in the manner described above. Producthousing, oil tank for the circulating oil lubrication ofbearings and gear unit, as well as the drive motor aremounted on a common base frame.

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TS 140 F / TS 210 F(TS 250 F / TS 360 F)

H200 / H 250

SIEBTECHNIK Screen Decanters

The screen decanter is a combination of solid bowldecanter centrifuge and screen screw centrifuge withoutstanding dewatering behaviour for granularproducts.

The charge suspension is first of allprethickened in the decanter section,and to a large extent dewatered on theconical section of the solid bowl. Theliquid is clarified in the cylindrical sectionand spun off at the end.The prethickened solid matter istransferred by the conveyor screw into thecylindrical screen section and is there separatedfrom the residual liquid adhering to it.

This small decanter Series has been developedspecially for laboratory and technical institutes.Where relatively small quantities of suspensionswith high solids contents are involved, thisdecanter version is also outstandingly suitable forproduction.

The rotating parts connected to the drive unit onone side offer the advantages of ready accessibilityand ease of cleaning.

A special feature with sizes TS 140 F and TS210 F is their convertibility to screen screwcentrifuges H 200 and H 250. For this purpose,only the product housing with feed pipe androtating parts are changed. These sizes arespecially suitable for laboratory use and asuniversal screw centrifuges.

This Series of centrifuges is also available ingastight form and with all drive options.

All the decanter sizes listed in the SIEBTECHNIK rangeare available with screen section. The largerSIEBTECHNIK screen decanters are available withexternally replaceable screen inserts.

All the SIEBTECHNIK features and equipment optionsdescribed are also applicable to these centrifuge types.

Particularly efficient washing can be carried out in thescreen section by a special SIEBTECHNIK washingdevice. Mother liquor and washing liquid can, ifrequired, be taken off separately.

By virtue of the minimal residual liquid, the ultra-fineparticle loss is relatively low and can be minimized byrecirculation of the centrifuge effluent.

SIEBTECHNIK small overhung-mounted decanters

Universal Screw Centrifuge

H 200 / H 250 /Type TS 140 F TS 210 F TS 250 F TS 360 F

Drum diametera) Solid bowl mm 140 210 250 360b) Screen mm 200 250 - -Motor kW 3 5,5 5,5 18,5Weight witha) solid bowl drum kg 200 550 850 1500b) screen drum kg 230 560 - -Length mm 680 910 1150 1635Width mm 820 1050 1200 1580Height mm 570 800 665 1015

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Circulating oil lubricationAll SIEBTECHNIK centrifuges are equipped asstandard with an integrated circulating oil lubricationsystem. The CYCLO gear unit, the main bearings andthe screw supplementary bearings are suppliedcontinuously with fresh oil by a pump unit. Thisfavourably affects temperatures, even at high speedsand prevents anti-friction bearing fouling. The returnoil is passed back to the oil reservoir integrated in thebase frame and filtered. Monitors are included in thesupply. This ideal lubrication system ensures longservice life of the gear unit and bearings with minimalmaintenance.

Weir adjustmentAt the cylindrical end of the drum, the clarified liquid isspun off across a weir. The height of the weirdetermines the pool depth and thus the residence timeof the suspension and thus the dry beach length ofthe solid matter.

All SIEBTECHNIK decanters are fitted with an infinitelyadjustable weir plate which ensures optimumadjustment and easy accessibility without involvingexpense for conversion.

ImpellerAlternatively, the clarified liquid can also be dischargedunder pressure by means of an impeller. Deliveryheads in excess of 20 metres are quite possible. Thisadditional device makes it possible to dispense with afeed pump downstream of the decanter.

Infinite sump adjustmentduring operationA special feature is optimization of the pool depth in thedecanter drum during operation for readjustment withconstantly changing products or product conditions.Here, SIEBTECHNIK offer a multi-channel peelingdevice which is used during two and three-phaseseparation in open as well as in gastight processsystems. Adjustment is effected during operation bymeans of adjusting spindle (patent applied for).

Solids discharge ringDischarge of solid matter is effected in the standardversion directly into solids housing. In the case ofproducts which tend to cake, the decanter shouldpreferably be fitted with a discharge device whichpasses the solid matter directly into the receiving screw.This discharge device consists of a ring positionedround the drum discharge section which is opentangentially in the bottom half about 45°. The solidsfall into the ring and are conveyed and discharged bythe scrapers attached to the drum. This directs thematerial into the solids chute.

Always a step ahead of the industrial standard !

Standard weir adjustment Infinitely variable sump adjustment during operation

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Slurrying troughIn many production cycles, the solid matter must bere-slurried after centrifuging. A specially developedslurrying trough intercepts the solid matter at the drumdischarge and permits direct slurrying in the centrifugeitself.The solid matter is deposited in a surrounding “waterbed” and discharged extremely finely distributed withthe movement of the liquid. This device rendersdownstream special containers and agitatorssuperfluous (patent applied for).

Three-phase separationThe three-phase version of the decanter provides notonly the facility for separation of the solid matter froma liquid, but also simultaneous separation of two liquidphases with different specific gravities.

Accelerated by the high centrifugal forces, the heavyliquid is deposited on the drum wall, so that the lighterphase floats. Whilst the solid matter is discharged bythe screw, the two liquid phases flow to the outletopenings at the cylindrical end of the drum and arethere discharged in separated form.

Equipping the centrifuge with a peeling device whichis adjustable during operation permits fast, optimumfine adjustment of the separating line between the twoliquids.

If density differences or proportions of the individualphases are changed, it is always possible here toachieve maximum possible separation effect andoptimum purity of the liquid phases by means of thelevel height adjustment described.

Overload protection (SIEBTECHNIK patent)A special feature of all SIEBTECHNIK decantercentrifuges is the patent overrunning clutch forprotection against overload. This clutch ensurescompletely friction-free mechanical powerdisconnection with maximum efficiency and simple

resetting of the operating function without the need forassembly. At the same time, disengagement in thecase of overload results in an electrical signal to shutoff the product feed and the drive motor.

Solid matter washingExcellent washing results can be achieved with manyproducts by means of a special washing device inSIEBTECHNIK decanters. This special equipmentoption ensures optimum displacement effects of themother liquor with variable washing zone adjustment.

Wear protectionFor abrasive products, we offer a selection of wearprotection options to suit a variety of applications:

Screw armouring with tungsten carbidedeposition welding employing a special processScrew thread armouring with carbide segmentsPowder armouringStellite tippingCeramic

MaterialsWe make all parts coming in contact with the materialto be centrifuged, according to requirements, ofstainless, austenitic steels, special bronzes, Hastelloy,nickel, titanium, etc.

CIP Cleaning (Cleaning in Place)As standard, our decanting centrifuges are fitted withvarious cleaning nozzles and an additional inlet tubein the inlet pipe, so that the centrifuge is rendered self-cleaning by means of suitable connection withoutinvolving any major expense.

For special requirements, the decanter can be fittedwith a CIP cleaning system. This includes specialwashing tubes, special nozzles and PTO drive.

Overflow pipe„light phase“

Overload protection„Scherenkupplung“,SIEBTECHNIKpatent

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In the standard version, an electric motor drives the drum directly viaa pair of V-belt pulleys. The rugged cycloidal planetary gear unitprovides the differential speed between screw and drum and at thesame time acts as a torque converter. Either the natural gear unittransmission ratio determines the differential speed as a function ofthe principal speed by locking the gear unit drive shaft (single drive),or it is determined by a second belt drive arranged in parallel by driveof the gear unit input drive shaft from the same electric motor. Drumspeed and differential speed can be altered by changing V-belt pulleys.

A hydraulic starting clutch limits the starting current and at the sametime acts as overload protection for the motor. The patent SIEBTECHNIK overload clutch prevents damage tothe mechanical gear unit in the event of overload.

In the same way as the standard drive, an electric motor drives thedrum directly by V-belt. The mechanical cycloidal gear unit is replacedby a hydraulic motor.

A hydraulic pump unit supplies the oil for the hydraulic motor and isintegrated in the base frame of the machine. This drive option permitsnot only infinitely variable manual adjustment of the speed to suit theproduct conditions, but also continuous analog regulation of the screwspeed according to the load characteristics with different solid matterconcentrations. This means that the differential speed increasescontinuously or suddenly with rising screw torque and converselyreduces with falling torque.

This SIEBTECHNIK drive control with integrated SPC is a state-of-the-art alternative to hydraulic drives and by means of two separatedrives permits infinitely variable adjustment of drum speed anddifferential speed. A compact control cabinet houses two frequencyconverters which are cross-linked such that when the screw is leading,the energy flowing backward via the gear unit shaft is made availableagain to the main drive.In addition to variable manual matching of drum speed and differentialspeed, this drive option also offers the facility for automatic analogspeed adjustment to suit changing operating conditions. A serialinterface is provided for PC connection which also permits computer-controlled regulation by means of product coding.This control can be integrated in any fully automated system.Possible functions:

Regulation functionsanalog to the torque, automaticPC-programmed control

Control functionsreduction or shutoff of product feed in the eventof certain process conditions

Possible emergency functionstorque limitationproduct feed shutoffdrive shutoff

Drive options

Standard drive

This SIEBTECHNIK drive ensures low noise,minimized wear and energy saving.

Cross-linkedfrequency converter drive

Hydraulic drive

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V2 z=r · g

V2

z= r · g

With both screen andsettling centrifuges,centrifuge characteristicnumbers and the resi-dence time of the productare measures of theefficiency of a machine.

Calculation of the speed difference

with single driven drum

∆n =igear unit

with dual driven drum - n eccentric

∆n =igear unit

Calculationof theperipheral speed

π r nv = [m/s]

30

Calculation of the centrifuge characteristicnumber

V2 nz = ≅ · r

r · g 30

Speed n = [min-1]

Diameter D = [m]

Radius r = D/2[m]

( )2

Diameter D = [m]

Spee

d n

= [m

in-1]

Cen

trifu

ging

fact

or z

Circumfer

entia

l spee

d v = [m

/s]

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Benefit from our experience !We offer the most versatile range of centrifuges in the world

Decanter centrifuges are being used succesfully for:

You will find SIEBTECHNIK throughout the world in allproduct fields. We regularly welcome visitors fromhome and abroad to trials, technical discussions andtraining sessions.This results in an optimum cooperation and lastingconfidence.

AbrasivesABS resinActivated sludgeAluminium alkylsAnimal fatAsbestos cement effluentBarium carbonateBarium sulphate/silicateBentoniteBicarbonateBiethanolBiotechnologyBisphenolBlood drainageBrewingCalcium sulphateCaseinCatalystCMCCoal oilCopper vitriol

For solids/liquid separation problems, do not hesitateto contact our specialist teams.

You can talk to us as competent, openminded partnerswho will take the time and trouble to give you the adviceyou need.

DMTDomestic sewageDrilling mudEffluent fromrock wool washingFish mealFlotation concentrateFlotation plantsFoundry blackwashGraphiteIndustrial effluentIron hydroxideIron sulphateKaolinLactoseLeaching plant residuesLead sulphateLiquid manureMeat/bone mashMethyl celluloseMica

Nickel formiatePaper effluentParanitrochlorbenzolPeripolymeridePhosphoric acidPolyolefinPolystyrenePolyvinyl acetatecPolyvinyl alcoholPolyvinyl chloridePotashPVCSilver nitrateSodium carbonateSodium chlorideSodium pyrosulphiteSodium sulphate/sulphiteSoya (proteins) SCPSoyamilkStarch (wheat, potato, maize)Strontium carbonate

SulphurTallow (fat purification)Tar dewateringTerephtalic acidTitanium dioxideUranium oreUsed oilVegetable oilZinc chromateZirconium silicateetc.

New applications areconstantly being tested in ourR+D laboratory or with ourtest machines at customers’plants.

SIEBTECHNIK GmbHPlatanenallee 46

D - 45478 Mülheim an der RuhrPhone 02 08 / 58 01 - 00Fax 02 08 / 58 01 - 300

e-mail: sales@siebtechnik.cominternet: www.siebtechnik.com W

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Screening MachinesProcess Equipmentcircular motion screensdouble counterweight screensround screensjigsattrition machinesflotation cells

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