ntt om.pdf

8/9/2019 NTT OM.pdf

1/24

ALLWEILER

1

Operating and Maintenance Instructions VMNo.: 460.0008 GBEdition: 12.98

IdentNo.: 550 102

VoluteCasing Centrifugal Pumps PN 16 Retainfor Heat Transfer Oils up to 350C for future

use!Series NTT

Orderno.: Pump ident. no.:

Machine no.: Pump type:

Operating data of pump as per order data sheetDimensions as per technical specification VM 500/...

Contents

1. General

2. Safety

3. Transportation andIntermediate Storage

4. Description

5. Installation/Mounting

6. Startup/Shutdown

7. Maintenance/Repair

8. Operating Faults, Causes and Remedial Action

9. Associated Documentation

These Operating and MaintenanceInstructions contain information fromthepump manufacturer. They may needto be supplemented by instructions oftheoperator company for its personnel.These instructions do not take account

of specific information relating tooperation and maintenance of theprocess plant into which the pump isintegrated. Such information can onlybegiven by the persons responsible forconstruction and planning of the plant(plant manufacturer).Suchspecific instructions relating tooperation and maintenance of theprocessplant into which the pumpisintegrated have priority over the

instructions of the pumpmanufacturer.

Referto the operating instructionsofthe plant manufacturer!

8/9/2019 NTT OM.pdf

2/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 2

1 General

1.1 Abbreviation

The abbreviation of the centrifugal pump is set upaccordingto the following schema, and is engraved on

the type plate.

Example:

Series

NTT 32 200 / 01 / 180 U5A W4

DeliverybranchNominal width

Size Impeller

nominal diameter

Hydraulicsno.

Impeller actual diameter

Shaft seal

Material code

Forthe twostage sizes the number of stages precedesthepumpsize, separated by a slash, e.g. 2/32200/...

1.2 Application and range of utilizationThevolutecasing centrifugal pumps ofseries NTT aresingleand twostage pumps of the process type of con-struction for organic heat transfer oils in heat transferplants according to DIN 4754.The fluids must contain no abrasive components andmust not chemically attack the pump materials.The application of uniform components in severalpumpseries and sizes allows for economical stockingof spares and procurement of replacement parts.

1.3 Limits of useSynthetic or degreasing heattransferoilsor other oils must have a minimum vis-

cosityof 2 mmata delivery medium temperature of

100C.If the operator is unable to guarantee this mini-mumviscosity, the pump must be modified (consult thefactory).Toxic heattransfer media always require a shaft sealwith pressureless quench receiver, a doubleactionmechanicalseal or a design with permanent magneticdrive.

1.4 Performance dataThe exact performance data applicable to the pumpcan be taken from the order data sheet and/or accep-tancetest report, and are engraved on the name plate.

1.5 WarrantyOur warranty for shortcomings in the supply is laiddown in our delivery conditions. No liability will be un-dertakenfor damages caused by noncompliance with

the operating instructions and service conditions.Ifat any later date the operating conditions change (e.g.differentfluid conveyed, speed, viscosity, temperatureor supply conditions), it must be checked by us fromcaseto case and confirmed, if necessary, that the pumpis suited for those purposes. Where no special agree-ments were made, pumps supplied by us may, duringthewarranty period, only be opened or varied by us orour authorized contract service workshops; otherwise

our liability for any defects will cease.

1.6 TestingPriorto leaving our factory, all pumps are subjected toaleak and pressure test. A performance test is carriedout if agreed. Only properly operating pumps, achiev-ing the performance assured by us, leave the factory.Thus,compliance with the following operating instruc-tions ensures faultfree operation and full delivery.

1.7 AvailabilityAs a matter of principle, we recommend stockingreplacementpumps and withdrawable units (hydraulicaction system) where the supplied pumps are adecisive factor in maintaining a production or deliveryprocess. In this way downtimes can be avoided, orreducedto a minimum.

1.8 Temperature and pressure limitsThefollowing diagram shows the applicationlimits as afunction of temperature, internal pump pressure andcasingmaterial.

Fig. 1: Internalpump pressure as a function of the tempera-

tureof the liquid to be pumped with material GGG40.

(Inline with AD memorandum W 3/2).

The sum of inlet pressure and maximum deliverypressuremust not be greater than the permissibleinternal pump pressure!

8/9/2019 NTT OM.pdf

3/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 3

2 Safety

These operating instructions contain basic safetyinstructions for installation, operation andmaintenance.Itis therefore essential that they are readbyfitters and all specialist staff and customer personnel

priorto installation and startup. They must always bekeptat hand at the place of installation.

The special safety instructions contained in the otherchapters must be observed in addition to the generalsafety instructions in this chapter.

2.1 Marking of instructions in the operatinginstructionsThe safety instructions contained in these operatinginstructions which represent a danger to personnel ifnotcomplied with are specially marked by the generaldanger symbol:

Warning symbolas per DIN 4844W9

Warning of danger from electric voltage is given asfollows:

Warning symbolas per DIN 4844W8.

Instructions which are essential to avoid endangeringthemachine and its functioning are marked by the word

ATTENTION

Instructionsaffixed directly to the machine such as

Directional markers

Signs for fluid connections

must always be observed and maintained in fullylegible condition at all times.

2.2 Personnel qualification and trainingTheoperating, maintenance, inspection and mountingpersonnelmust be appropriately qualified for the dutiesassigned to them. The scope of their responsibilities,competency and supervisory duties must be closelycontrolledby the customer. If the personnel do not havethe required knowledge, they must be trained andinstructed. If required, this may be provided by the

manufacturer/supplier on behalf of the customer. Thecustomermust additionally ensure that personnel fullyunderstand the content of the operating instructions.

2.3 Dangers in the event of noncompliance withsafety instructionsFailureto comply with the safety instructions may resultin danger to persons, and place the environment and

the machine at risk. Noncompliance with the safetyinstructions may lead to the loss of any claims fordamages.Noncompliance may relate to the following dangers:

Failure of important functions of the plant

Failure of specified methods for maintenance andservicing

Danger to persons resulting from electrical,mechanical and chemical effects

Dangerto the environment resulting from leakage of

hazardous substances

2.4 Responsible working practicesThe safety instructions contained in these operatinginstructions, current national accident preventionregulations,as well as internal working, operating andsafety rules of the customer, must be observed.

2.5 Safety instructions for the user/operator

Hot or cold parts representing a danger must beprotected against accidental contact on site.

Protection against accidental contact for moving

parts (such as the coupling) must not be removedwhile the machine is in operation.

When operating pump aggregates in a dustladenenvironment (e.g. milling, chipboard manufacture,bakeries), the surfaces of the pumps and motorsmustbe cleaned at regular intervals, depending onlocal conditions, in order to maintain the coolingeffect and eliminate the possibility of spontaneouscombustion. Refer also to explosion protectionregulations (ZH 1/10).

Leakage (e.g. from the shaft seal) of hazardoussubstancesbeing handled, such as explosive, toxic

or hot materials, must be discharged such that nodanger to persons or the environment is created.Legal regulations must be observed.

Dangersfrom electrical energy must be eliminated.For details in this regard, refer to VDE and localpower company regulations.

8/9/2019 NTT OM.pdf

4/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 4

2.6 Safety instructions for maintenance, inspectionand mounting workThe operator company shall ensure that allmaintenance, inspection and mounting work isperformed by authorized and qualified specialistpersonnel who have thoroughly studied the operatinginstructions.

Workon the machine is only to be carried out when themachine is at a standstill. The means of shutdown ofthe machine described in the operating instructionsmust always be followed.Pumps or aggregates handling fluids which aredetrimental to health must be decontaminated. Allsafety and protective devices must immediately berefitted and made operational on completion of thework.The instructions under Section 6.1, Preparation forstartup, must be observed before restarting.

2.7 Unauthorized conversion and production of

replacement partsConversion or modification of the machines is onlypermissible after consultation with the manufacturer.Original replacement parts and accessories approvedby the manufacturer serve safety purposes. If otherparts are used the manufacturer cannot be held liablefor the consequences.

2.8 Impermissible modes of operationThe operating safety of the machine supplied is onlyensuredwhen it is used inaccordance withSection 1oftheoperating instructions. Thelimit values given on thedata sheet must under no circumstances be exceeded.

8/9/2019 NTT OM.pdf

5/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 5

3 Transportation and Intermediate Storage

3.1 PackagingAttention must be paid to the markings on thepackaging.The suction and pressure sides and all auxiliary

connections must always be closed duringtransportationand storage. The closing plugs must beremoved when the pump aggregate is installed.

3.2 TransportationThe pump or pump aggregate is to be safelytransported to the place of installation, if required bymeansof lifting gear.

The generally applicable safety regulations forlifting loads must be observed. The crane deviceand cables must be adequately dimensioned. Thecablesmust not be attached to the attachment eyesof the motor.

Complete aggregates, with a base platemountedhorizontal foot pump and mounted, coupled motor,must be transported to the place of installation asshownin the illustration.

Fig. 2: Transportation of a horizontally mountedpumpaggregate

Transport damageCheck the pump for damage on receipt.Anydamage detected must be notifiedim-

mediately.

3.3 Preservationand storage of the centrifugal pumps

3.3.1 PreservationIn the case of storage or prolonged standstill, thepumps must be protected against corrosion. In thosecases, an outside and inside preservation is to beprovided. The durability of the protection againstcorrosion, which is limited in time, depends on thecomposition of the preservative to be applied and thestorage conditions.

Under normal circumstances the pumpshave no special preservative.

At an additional charge we can, however, supplypumpsand replacement partsex factory with a preser-vativeadequate to the planned storage period.

Wewill be pleased to specify suitable preservativesforyou on request.

3.3.1.1 Outside preservationTheoutside preservativeshould be applied by paintingor spraying with a spray gun.

Points of preservation:Allbright and unvarnished parts (e.g. shaft ends, cou-plings, flange facings, valve and manometer connec-tions).

3.3.1.2 Inside preservationThepreservativeis to be applied by filling the pump. Forthesepurposes, the suction side of the pump must firstbe closed with a dummy flange. During filling, the pres-sureflange must be on a higher level than the suction

flange. During the filling process, the shaft must beslowly cranked against the direction of rotation.Fillingmust be continued until the preservative reaches thesealing strip of the delivery flange, bubblefree. Thenthe outlet side is to be closed with a dummy flange.Note:Not required for pumps made of stainless ma-terials.

Points of preservation:All bright parts inside the pump (e.g. pump casing in-side, shafts, impellers and diffusers).

3.3.1.3 Monitoring of preservationIn the event of prolonged storage, the preservation ofthepump must be checked by the customer at regular

intervals.Every six months the pump level must be checked; ifnecessary,preservative must be topped up to the seal-ing strip on the pressure flange.Atthe same time, the packing must bechecked for de-struction, and repaired if necessary.Note:Liability for damages caused by improper pres-ervation cannot be assumed by us.

8/9/2019 NTT OM.pdf

6/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 6

3.3.1.4 DepreservationPrior to setting the pump in motion, the preservativeapplied must be removed.Environmentally compatible disposal must beensured.

The pump must be dismounted and thoroughly

cleaned.This particularly applies to pumps used in thefood industry or in drinking water supply. A suitablefoodstuffcompatible solvent, compatible with the de-livery medium, may be applied. Appropriate solventsare for example: spirit, Ritzol 155, or heavily alkalinesoapsuds. Steam jet cleaning devices with appropriateadmixtures can also be used (allow solvent to act be-forehand).

Prior to startup after prolonged storage,allelastomers (Orings, shaft seals) must

bechecked for their elasticity of shape. Embrittled elas-tomers must be exchanged. Elastomers of ethylenepropylene rubber (EPDM) must always be replaced.Thepump must be filled with fluid to prevent seizingofthe components.Note:If pipelines, tanks or other parts in the plantarewettedwith paraffincontainingpreservative, the entireplant must be depreserved. All preservative residuesmust be eliminated; malfunctions of the pump mayoccur if they are not.

3.3.2 StorageDuring storage of the pump, the suction and outletbranchesand all other supply and discharge branchesmustalways be closed with dummy flanges or dummyplugs.Storageshould bein a dry, dustfree room. During stor-age, the pump should be cranked at least once amonth.During this process, parts such asthe shaft andbearings should change their position.

8/9/2019 NTT OM.pdf

7/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 7

4 Description

4.1 Structural designHorizontal,single and twostage, singleentry volutecasing centrifugal pump with axial inlet of the processtype of construction.

4.1.1 Volute casingVolutecasing with caston feet and casing cover, partlywith intermediate ring; twostage pumps additionallywith stage housing.

4.1.2 Branch positions/flangesSuction branch: axiallyDelivery branch: radially upwardsFlanges: to DIN 2533 PN16

4.1.3 Auxiliary connectionsFor required auxiliary connections refer to the bindinginstallationdiagram of the pump aggregate.

4.1.4 ImpellerEnclosedradial wheel without back vanes. Axial thrustcompensation by relief bore holes.Twostagedesign: two enclosed radial wheels withoutbackvanes. Axial thrust compensation by opposing im-peller arrangement.Residualthrust absorbed by groove ball bearing in thebearing bracket.

4.1.5 ShaftThe pump is equipped with a particularly rigid shaft,providingtroublefree operation in all load phases. Asa result of the bending rigidity and the short distancebetween bearing and shaft seal, true running is

achieved creating optimum conditions for the shaftseal.

4.1.6 Bearing and lubricationBymeans of two groove ball bearings DIN 625, the oneof which on the pump side is lubricated by the liquidpumped, and the one on the drive side by specialgrease.

4.1.7 ShaftsealSingleacting, maintenancefree mechanical seal ofthe unbalanced type with premounted safety stuffingbox.A throttling line for lowering the temperature of theliquid pumped is arranged between mechanical sealand safety stuffing box.Through the leakage connection LO, emerging heattransfer leakage quantities, if any, can be safelydrained and completely collected.

The following materials are provided for the mechanical seal:

Abbre

viation

MaterialtypeMaterial

code

DIN 24 960

Rotat ing seal r ing Special cast chromium S

Stationary seal ringHard carbonsynthetiresinimpregnated B

Oring Fluorcaoutchouk (Viton) V

U5A Spring CrNiMoStahl GOther structuralparts

CrNiMoStahl G

Safety stuffing boxHighly heatresistant specialpacking, outside graphitizedDiaplex braiding

4.2 Construction of the pump aggregate

4.2.1 DriveThe pumps can be directly coupled with electricmotors, or any other prime movers.In most cases, surfacecooled threephase squirrelcageinductionmotors are used as driving motors, typeIMB3, class of protection IP 54 to IEC standard, class Binsulation, outputs and speeds to DIN 42 673.

Theexact motor data are to be found on the order datasheet.

4.2.2 Shaft coupling and contact protectionFlexible shaft coupling to DIN 740 without or withspacer.Protectionagainst accidental protection to DIN 24 295is provided where a pump, base plate and shaftcoupling are supplied as the product package.

According to accident prevention regulations, thepump must only be operated with a protectionagainst accidental contact as per DIN 24 295.

Ifno contact protection is provided, it must be attachedby the operator.

4.2.3 Base plateOf cast iron or steel. Execution is dependent on size.

See separate installation diagrams.

8/9/2019 NTT OM.pdf

8/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 8

5 Installation/Mounting

5.1 InstallationInprinciple, the pumps are to be installed horizontally.

The safety regulations and tests in accordance

with DIN 4754 and VDI 3033 must be observedwherepumps are installed in heattransfer plants.

5.1.1 Place of installationTheaggregate should as far as possible be installed at

thelowest point of the plant; that is, where the geodeticsupply head is highest.The temperature transfered by the delivery fluid ontothecasing cover and the bearing bracket is significantlyreducedby the special design of the overall insert unit.The installation location must be chosen such that noheat buildup can occur in the area of the bearingbracket.

Only the spiral casing may be insulated

with heatinsulating material. All otherpump components must not be insulated, in order toensure optimum heat discharge.

To prevent injury from burns, appropriate protectivedevices must be installed (protection againstaccidental contact).

5.1.2 Ambient temperature at the place of installationPumpaggregates in enclosed rooms must be installedsuch that no heat buildup occurs. If ambienttemperatures above +40C are to be expected,suitable ventilation must be provided to discharge theradiated heat and supply adequate fresh air to the

room. Consult the factory if necessary.

5.2 Mode of fasteningThemode of fastening is dependent on the design typeandsize of the pump and the coupled motor, as well aslocal installation conditions.Horizontal pumps with feet and the driving motor arefixed on a common base plate.

Precisedetails on form and dimensions are given in theinstallation diagram.

5.3 Foundation

5.3.1 General

Thefoundation may be a floor/concrete base or a loadbearing steel foundation frame.Note:The foundation must be designed so it can taketheweight of the pump aggregate across its entire area.

5.3.2 Characteristiques of a steel foundation frameAsteel foundation frame must be designed so that thebase plate makes contact across its entire area, andcan be bolted or welded down.

If the base plate is only supported at fourpointsthe pump aggregate will hang down

inthe middle. This will affect the alignment of the couplingand may also lead to severe noise being generated.

5.3.3 Characteristiques of a floor/concrete foundationThefoundation must be horizontal, flat and clean, andbecapable of bearing the full load upon it.Note: Concrete foundations must be executed with

standardconcrete of strength class B 25 as a minimum.

5.3.4 Alignment of the pump aggregateThe pump aggregate must be aligned to its presetheightand system dimensions. This isdone using suitablesteel shims, arranged directly adjacent to each fixingbolt.Thetotal height of the steel shims is determined by thepreset system dimensions of the plant. The steelshims and the base plate must sit flush.Ifthe fixing holes are more than 750 mm apart, we recommend fitting additional steel shims in the middle ofthe base plate.

Steelshims Foundation

Base plate

= =

> 750

Fig.3: Alignment with steel shims

Horizontal alignment of the aggregate is produced byway of flatmachined surfaces on the pump using amachinespirit level. Measurements are taken inlongitudinal and transverse directions of the pump aggre

gate.Permissible deviation:max. 1 mm per 1 m length.

5.3.5 Fixing the pump aggregateWhenthe aggregate has been aligned on the foundation the fixing bolts should be tightened evenly, alternating side to side.Recommendation:As far as possible, the base plateshould be caston over its entire length with a nonshrinking mortar casting compound.Note: When castingon and packing with the mortarcasting compound, it must be ensured that the baseplatemakes contact with the foundation over its entirearea, and that there are no cavities.

5.4 Checking the coupling alignmentA complete pump aggregate delivered has beencarefully assembled at the factory. After properinstallation, and prior to startup of the pumpaggregate, the alignment of the coupling between thedrivemotor and the pump must be checked. The checkis best made with a straightedge and a feeler gauge intwo planes, each offset by 90,on the circumference ofthe coupling.

8/9/2019 NTT OM.pdf

9/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 9

If a height, lateral or angle offset is detected betweenthe two coupling halves, the drive motor should berealigned to the pump such that the coupling halvesare flush with each other (level out with flat packingshims as necessary). The gap between the twocoupling halves must be the same all round thecircumference of the coupling. The specified gap is

shown in the installation diagram. The spacingbetween the straightedge laid over both couplinghalves and the respective shaft must be the same allround the circumference.

Straightedge

Feeler gauge

Fig. 4: Alignment of the coupling with straightedge andfeelergauge

In place of the straightedge and feeler gauge, theradial and axial alignment of the coupling can becheckedwith dial gauges. This gauging method is usedfor couplings with spacers (removable couplings).

Fig.5: Alignment of the coupling with dial gauges

Note: The permissible axial and radial deviation,

measured on the front face of the coupling and thecoupling circumference respectively, may be max.0.1 mm, but as far as possible should be kept below0.05 mm.When the foundation bolts have been aligned andtightenedthe pump/drive motor unit must be able to bespun by hand without pressure points.

Outofflush errors on the coupling maylead to heavier wear of the coupling,

antifrictionbearing, and the shaft seal. They may evencause the shaft end break off.

5.5 Assembly of pump and drive motorIfthe aggregate is only assembled at the place of use,the coupling is assembled as follows:

1. Coatthe pump and motor shaft ends with a fine filmof molybdenum disulfide (e.g. Molykote) and insertkeys.

2. Pushon thecoupling halves on the pump and motorside with the aid of a pusher device until the shaftend is flush to the coupling hub.Ifno puller is available, heating the coupling halvestoapprox. 100C (without rubber buffer) facilitatespushing.

The possibility of axial shock stressonthepump and drive motor components

duringassembly of the coupling must be eliminated.When fitting the coupling halves, brace the pumpshafton the impeller side and the motorshaft on thefan side. Dismount the fan hood if necessary.

3. Tighten the grub screw on both coupling hubs.

4. When assembling the pump and motor, make surethe specified gap between the coupling halves ismaintained (see our installation drawings).

5. In the case of horizontally mounted pumpaggregates fixed on a base plate or directly on thefoundation, the coupling must be aligned asdescribed in Section 5.4.

6. Mount the contact protection.According to accident prevention regulations, thepump must only be operated with a protectionagainst accidental contact.

5.6 Space required for maintenance and repairThe pump must be accessible from allsides in order to be able to carry out

necessary visual inspections.Adequate space must be provided for maintenanceand repair work, in particular for removal of the drivemotorand of the cartridge unit. It must also be ensuredthat all pipelines can beattached and removed withouthindrance.

5.7 Laying the pipelines

5.7.1 Nominal widthsThe nominal diameters of the pipelines need notnecessarily correspond to those of theinlet and outletbranch, however, they must not be smaller. Differentnominaldiameters of connections and pipelines are tobecompensated by eccentric/centric transition pieces.Formation of air bags is to be avoided.

8/9/2019 NTT OM.pdf

10/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 10

Inlet pipelinefrom above

Inlet pipelinefrom below

Inlet branchPump

Inlet branchPump

Fig.6: Laying of pipelines

For short pipelines, the nominal width should beenoughto keep the flow resistance as low as possible.Forlong pipelines the economical nominal width shouldbe determined from case to case.

5.7.2 Change of crosssections and directionsSudden changes of crosssections and directions, aswell as hairpin bends, are to be avoided.

5.7.3 Supports and flange connectionsThepipelines must be connected to the pump, stressfree. They must be supported close to the pump and

must allow easy screwingon to avoid twisting. Whentheconnections are loosened the pipeline must neitherbeslanted nor springing, nor must it be under pressure.Any thermal stresses occurring on the pipelines mustbe kept away from the pump by suitable means, e.g.installing compensators.

5.7.4 Cleaning pipelines prior to attachmentPriorto assembly, all pipeline parts and valves must bethoroughly cleaned; especially in the case of weldedpipelines, burrs and welding beads must beremoved.Flange gaskets must not protrude inwards. Blankingflanges,plugs, protective film and/or protective paint onflanges and seals must be removed completely.

5.7.5 Inlet pipelineInorder to avoid the formation of air bags, the inlet pipe-line must be laid with a slight inclination to the pump.

5.7.5.1 Stop valve (supply operation)Closeto the pump, a stop valve must be installed intheinlet pipeline which, during operation, must be com-pletelyopened and must not be used for regulating pur-poses.

5.7.6 Pressure pipeline

5.7.6.1 Stop valve in the pressure pipelineAstop valve should be installed in the pressure pipelineclose to the pump, to regulate the delivery.

5.7.6.2 Check valve in the pressure pipeline

Itis recommended to install a check valve betweenthepressure connection and the stop valve in order to pre-ventdamaging fluid splashes onto the pump when theplant comes to a sudden standstill.

5.7.6.3 BleedingAbleed facility should be provided at the highest pointof the pressure pipeline.

5.7.7 Auxiliary connectionsThepositions of the auxiliary connections on the pumpareshown in the sectional drawing and the installationdiagram.

The following connections are always provided:FF FillingFD Fluid drainLO Leakage outlet V Venting

Accordingto DIN4754, this connection serves for the safedraining of the heat transfer seepages emerging from theshaftseal.

5.8 Safety and control devices

5.8.1 ManometersSuitablepressure gauges are to be installed in the suc-tion and pressure pipelines.

5.8.2 ThermometersThermometers must be provided to monitor the tem-perature of the delivery fluid.

5.8.3 Safety devices in the inlet, delivery and auxiliarypipelinesSafety devices in the form of stop valves must be in-stalledin the pipelines, if not already provided, to allowthe pipelines to be shut off and disconnected duringmaintenance and repair work.

5.9 Electrical connectionsThe power supply cables of the coupled drive motormust be connected by a trained electrician, accordingtothe motor manufacturers circuit diagram. The appli-cable VDE regulations and local power company rulesmust be observed.Danger from electrical energy must be eliminated.

5.10 Leak testing of the pumps by the operatorAnyleak testing by the operator on the pump must onlybe carried out with heattransfer oil.Testingof the pump with water is not allowed, as it maycausethe groove ball bearing in the bearing housing tofail prematurely.

8/9/2019 NTT OM.pdf

11/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 11

6 Startup/Shutdown

Whenstarting up and shutting downthe pump, ac-cident prevention regulations UVV/VBG 64 forheattransfer plants with organic heattransfermedia, issued by the Employers Liability Insur-

anceAssociation, must be observed in addition tothesafety regulationsin accordance with DIN 4754and VDI 3033.

6.1 Preparations for (initial) startup

6.1.1 Filling and bleeding the pump in the plantPriorto starting up, the pump must be bled in the plant.Forthis, the plant and the pump must be filled with de -liveryfluid (see plant manufacturers operating instruc-tions).Duringfilling with delivery fluid, we recommend slowlyrotatingthe pump shaft by hand to allow air pockets toescape into the piping system.If the pump fails to build up pressure when started up(see manometer), bleeding must be repeated.

Thepump must not run dry,not even forchecking the direction of rotation.

6.1.2 Filling and bleeding the bearing bracketDueto the sealing effect of the safety stuffing box, thebearing bracket must be separately filled with heattransferoil.

Forbleeding and filling, the screw plugs of connectionsVand FF are removed and at connection FF, clean heattransferoil of the same quality as the liquid pumped isfilledin until same emerges at connection V. In order toachieve a good flow it may be required to heat up the

heattransferoil prior to filling. If no further air escapesatconnection V, both connections can be closed again(please refer to view X in the sectional drawing).

Duringbleeding of the pump and the plant, hazardousor environmentally harmful fluid and gas emergingmust be safely collected and discharged.

6.1.3 Control of drive motor direction of rotationThe direction of rotation of the motor must match thedirectionof rotation arrow on the pump. The motor canbebriefly switched on to check the direction of rotation.Awrong direction of rotation impairs delivery and maydamagethe pump.

Ifit is wrong, the direction of rotation of the threephasemotor can be reversed by swapping any two phases.

6.2 Startup

6.2.1 Checking the coupling alignmentPriorto starting and after the first runup of the pump tooperatingtemperature, the coupling alignment is to bechecked. Readjust, if necessary (please refer to Sec-tion 5.4 above). The pump shaft must be capable ofbeing cranked by hand and without any pressurepoints.

6.2.2 StartingToavoid overloading the drive motor, the pump shouldberun up only against a closed pressure stop valve dur-ing starting.Thestop valve in the inlet pipeline must be fully open.

6.2.3 DriveSwitch on the motor.Payattention to productspecific characteristics.Refer

to the operating instructions of the drive motormanufacturer.

6.2.4 Setting the delivery values of the pump and heat-ingup of the plantFirst,heat the plant to 100 130C withthe pump run-ning.For these purposes, the stop valve on the supplyside must be completely opened. The stop valve pro-videdon the outlet side must be opened to such a de-greethat first, a minimum delivery flow (please refer toSection 6.2.5 below) is achieved and maintained toheatthe plant with the pump. Operate the plant at thistemperatureuntil any water in the heat transfer oil hascompletely steamed out. Thereafter, heat plant up to

operating temperature.After the operating temperature has been reached,openthe outletside stop valve until the required deliv-ery values are reached.

Theplant manufacturers instructions con-cerning heatingup of the plant have prior-

ity over the above general recommendations.

6.2.5 Maintaining the minimum delivery rateTo prevent cavitation damage as a result of additionalheatingof the fluid, the pump should not be run againsttheclosed stop valve in the pressure pipeline exceptinthe starting phase.

Thefollowing equation is applied to deter-mine the minimum delivery rate:

Output[KW] at rate Q = zero (seecharacteristic) for thedesignimpeller diameter [mm] x faktor 0.5 = minimumdelivery rate [m3/h].

6.2.6 TemperatureSudden temperature shocks are to be avoided.

6.2.7 Higher density or viscosityIf the density or viscosity of the delivery fluid is higherthanforeseenby the design of the pump, the motor maybe overloaded.

8/9/2019 NTT OM.pdf

12/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 12

6.2.8 Higher delivery rateIf delivery is run at a higher rate than foreseen by thedesignof the pump, it is essential to ensure that theex-istingsuction head is still adequate, because otherwisecavitation and resulting damage may occur.Condition: NPSHavail.> NPSHreq.Thedelivery rate should, as far as possible, notexceed

the value atopt.

6.2.9 Spare pumpA spare pump belonging to the plant must always bekeptready for operation. For these purposes, the stopvalveon the supply side must be completely open. Thestopvalve on the outletside must be opened to such adegreethat the pump, filled and bleeded, hasoperatingtemperature.Note:Thepump must be secured against backflow, bymeans of a deliveryside check valve for example.

Inplants in which impermissible tempera-ture of the heattransfer medium may

arise due to failure of the operating pump, a standby

pump of sufficient output must be provided.Twoindependent energysources must be provided forthe operating and standby pumps.

6.3 Shutdown and Restart

6.3.1 Stopping operation

Pump runonPriorto the motor being switching off, the pump musthave sufficient runon when the heating source isswitchedoff. The delivery fluid temperature must bereduced to the extent that heat buildup inside thepump is avoided.

Pressure pipelineIfa check valve is installed in the pressure pipeline,thestop valve can remain open. If no check valveisfitted, the stop valve must be closed.

DriveSwitchoff the motor. Make sure the pump runs downsmoothly and evenly.

Inlet lineClose stop valve in inlet line.

6.3.2 RestartBefore restarting, check that the pump shaft is at a

standstill. If the stop valve in the delivery pipeline isleaky, the pump shaft may rotate in reverse directiondue to the backflow of the delivery fluid.

The pump must not be switched on whenthepump shaft is rotating in reverse direc-

tion, as this may damage the pump shaft.

6.3.3 Measures in case of prolonged interruptionIf a prolonged interruption is intended, and there is ariskof frost, the pump must be drained and preserved(see Section 3.3).

8/9/2019 NTT OM.pdf

13/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 13

7 Maintenance/Repair

7.1 Maintenance

The instructions in Section 2, Safety, must beobserved in maintenance and repair work.

Regular monitoring and maintenance of the pumpand drive motor increases their service life.

The following instructions are generally applicable.

7.1.1 General monitoring

1. The pump must not run dry.

2. The minimum delivery rate must always be main-tained (see Section 6.2..).

3. The drive motor must not be overloaded.

4. The mechanical seal must not have any un-controlled leakage.

5. Thebearing bracket must always be filled with heattransferoil. If the plant and/or pumpwas drained, thebearing bracket must be topped up with heattransferoil and bleeded again (please refer to Sec-tion 6.1.2 above).

6. Pressureandtemperature monitors and flow metersmust be observed.

Note: In addition, the instructions for erection, oper-

ationand servicing of heat transfer plants according toDIN4754and VDI 3033are to be observed.

7.1.2 Maintenance of components

7.1.2.1 Bearing and lubricationThe bearing of the pump shaft is by two groove ballbearingsaccording to DIN 625. The pumpsidegrooveballbearingis lubricated by the liquid to be pumped, theone on the drive side by special grease.The nominal service life of the groove ball bearingsachievesat least the required operating hours requiredin the Technical Requirements DIN ISO 5199.At the factory, the driveside groove ball bearing wasprovided with a sufficient grease filling. For the relu-

bricationperiods for the greaselubricated rolling bear-ing, please refer to the following listing.

Speed Bearing bracket size

360 470 530 650

min1 Lubrication period in operating hours

1450 13.500 12.300 11.400 10.500

1750 12.200 11.000 10.100 9.300

2900 8.600 7.700

3500 7.700 6.600

Notes:

1. At a maximum ambient temperature of 35C and amaximumoperating temperature of the thermal oilof350C,the temperature at the couplingside rollingbearing is 70C. Higher ambient temperatures andmissingventilation may cause highertemperatures.

2. In case of temperatures over70C, the lubricationperiod for 15C each temperature rise mustbe re-duced to one half!

3. Unfavourable operating and ambient conditionssuch as dust, high air humidity, aggressive atmos-phere etc. may require even shorter lubricationperiods.

Atleast after 2 years, the groove ball bearings must bedismounted and replaced.

The grease filling for the couplingside rolling bearingis to be effected as described hereinafter.

1. Fill hollow spaces between the rolling bodies up toapprox.40% with grease. Dependingupon the bear-ing size, this corresponds to the following greasequantities.

Bearing bracket size Grease quantity

360 6 grams

470 12 grams

530 30 grams

650 65 grams

2. Scrape off excessive grease (most suitably withyour fingers, do not use any metallic object).

Rolling bearing greases:For the lubrication of the driveside groove ball bear-ing,the belowlisted rollingbearing grease or an equiv-alentspecial grease with molybdenum disulfite portionand the following characteristics must be used.

Quality:Therolling bearing grease must be free from resin andacid and anticorrosive.

Characteristics:Worked penetration 265295 mm/10Dropping point 260 CRange of temperatureapplication: 10 bis 150 C

Manufacturer Brand

TotalBELRAY MOLYLUBE 126 E.P.GREASE 2

Sole distributor in the Federal Republic of Germany:Deutsche Total GmbH

8/9/2019 NTT OM.pdf

14/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 14

7.1.2.2 ShaftsealSingleacting, maintenance free mechanical seal ofthe unbalanced type with premounted safety stuffingbox.A throttling line for lowering the temperature of theliquid pumped is arranged between mechanical sealand safety stuffing box.Even in case of failure of the mechanical seal, these

additional safety elements prevent seepage fromemergingin a hazardous quantity and manner (require-ment to DIN 4754).Heat transfer seepages which may perhaps emergefrom a damaged shaft seal can be drained throughseepage drain LO. Minimal dripping of nonvolatilemediaresulting from the functioning of the componentsis to be expected.

Atthe site, it must be assured by the operator that theseepagesdrained through seepage drain LO are safelyandcompletely collected in a closed tank. This appliesin particular when operating with toxic heattransferoils.

Due to the special design of the cartridgeunit pump,the temperature is reduced to such an extent thatproper functioning of the bearing and shaft seal is as-sured. In the event of heavy leakage due to wear, themechanical seal should be replaced.

Asdry running of the mechanical seal mustbeavoided, the pump may be started in a

filled and vented condition only.

7.1.2.3 CouplingFollowinginitial startup, after first heating of the pumpto operating temperature and at regular intervals, thealignmentof the coupling and the condition of the flex-ible elements in the coupling is to be checked(pleaserefer to Section 5.4 above).Note:Worn flexible elements are to be replaced.

7.1.2.4 DriveRefer to the operating instructions of the motormanufacturer.

7.2 Repair (Dismounting and Mounting Instructions)

GeneralTrainedService fitters are available on request to carryout mounting and repair work.Where repairs are carried out by the operators ownpersonnelor by specialist fitters, it must be ensured that

the pump is fully drained and cleaned.This particularly applies to pumps which are sent forrepair to our factory or one of our service workshops.We must refuse acceptance of repair work on pumpsfilled with fluid, for the protection of our staff and forenvironmentalreasons. Otherwise we must invoice thecustomer/operator for the costs of environmentallycompatible disposal.Where repairs are to be carried out on pumps whichhave been operated with hazardous substances and/or environmentally harmful media, thecustomer/operator must inform its own personnel onsite,or our personnel where repairs are returned to ourfactory or a service workshop, without beingspecifically requested to do so.In such cases a verification of delivery material, forexamplein the form ofa DIN safety data sheet, must besubmittedto us together with the request for a Servicefitter.Alternatively, you can request a certificate of safety(formno. 448/191) from our Service department, fillingitout truthfully, correctly andin full. Send the completedformto the center commissioned with carrying out therepair, or hand it to our Service fitter.

Hazardous substances are:

Toxic substances Healthendangering substances Corrosive substances Irritants Explosive substances Fireinducing substances Highly flammable, easily flammable and normally

flammable substances Carcinogenic substances Substances impairing fertility Genetically distorting substances Substances in other ways hazardous to humans

For all work on site, the operators own personneland/or our fitters must be advised of the possible

dangers involved in the repair work.

The most important dismounting and mountingoperations are described in these instructions. Themounting steps described in the individual sectionsmust be consistently observed.

8/9/2019 NTT OM.pdf

15/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 15

7.2.1 Dismounting the centrifugal pumpBeforedismounting, the following work must be carriedout:

Thepower supply cable must be disconnectedfromthe motor by an authorized electrician. Electricaldanger must be eliminated! The motor must be

secured against being switched on.

Close all stop devices in the supply and pressurepipeline.

Allow the pump housing to cool to ambienttemperature.

Drainthe fluid in flowable condition from the pump.For these purposes, screw out plugs for draining.Note:Use a collecting tank.

The pump must be depressurized and drained.

Hazardous substances and/or environmentallyharmful media must be drained off and collectedsuch that no danger to life and limb is created.Environmentally compatible disposal must beensured.

Remove auxiliary pipelines, if fitted.

Dismountmanometer lines, manometers andhold-ing devices.

Dismountprotection against accidental contact andsupportingfoot.

7.2.1.1 Dismounting the cartridgeunit pump

The cartridgeunit pump consists of all pump compo-nentsexcept for the volute casing. For the dismountingofthe cartridgeunit pump, the motor must first be dis-mounted when using a shaft coupling without spacer.Duringsubsequent assembly see to it that the motorisexactlyaligned.When using a coupling with spacer, the cartridgeunitpump can be dismounted towards the motor side,whereas the volute casing and motor may remain onthe base plate and the pipelines at the volute casing.

Ifa shaft coupling with spacer is available, dismountspacer.Incase of shaft coupling without spacer, dis-mountmotor from the foundation.

Loosen hexagon screws (901.01) and/or hexagonnut(920.01) and turn out. In case of design with in-termediate ring (509.01), loosen hexagon screws(901.02)and turn out.

Pull cartridgeunit pump consisting of impeller,shaft, casing cover, intermediate ring etc. (depend-ing upon the design) with the bearing bracket(330.01) out of the centering of the volute casing.

Remove gasket (400.01) and/or (400.02) from thesealing surfaces, and clean sealing surfaces.

7.2.1.2 Dismounting the impeller with singlestage cen-trifugal pump

Remove impeller nut (922.01) with spring ring(936.01) and/or spring washer (934.01) from theshaft (210.01).

Withdrawimpeller (230.01) from the shaft (210.01).

Remove key (940.01) from the shaft (210.01).

If necessary, remove intermediate ring (509.01) byloosening the hexagon screws (901.01). Removegasket (400.01), clean sealing surfaces.

7.2.1.3 Dismounting the impellers with twostage cen-trifugal pump

Loosenhexagon sockets with cup points (904.05) inthe threaded ring (514.01), and screw out.

Bymeans of a pintype face spanner, turn threadedring (514.01) from the impeller first stage (230.02).

Remove impeller second stage (230.03) from theimpeller first stage (230.02).

Pull stage casing (108.01) with installed diffuser(171.01) out of the centering of the casing cover(161.02) and over the impeller first stage (230.02).

Remove impeller nut (922.01) with spring ring(936.01) from the shaft (210.01).

Withdrawimpeller first stage (230.02) from the shaft(210.01).


7.2.1.4 Dismounting the safety stuffing box packingFollowingthe dismounting of the impeller from singlestage and/or the impellers from twostage centrifugalpumps,the safety stuffing box, consisting of two pack-ing rings (461.01), can be dismounted as follows.

Dismount circlip (932.01) with distance washer(551.01) over the shaft (210.01).

Remove old packing rings (461.01) from the shaftsealing chamber, and clean same carefully.Note:Collect emerging liquid to be pumped in anoilcollectingpan.

7.2.1.5 Dismountingthe groove ball bearings and the shaftseal, design mechanical seal U5AThe mechanical seal is dismounted together with thegroove ball bearings.

Loosenhexagon socket with cup point at the pumpside coupling half, and withdraw coupling half fromthe shaft end. Use pulloff device!


Loosenscrew plugs (903.06) and (903.07) for filling

and venting the bearing bracket (330.01), and turnout.

8/9/2019 NTT OM.pdf

16/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 16

Turnbearing bracket (330.01) with screwedon cas-ing cover (161...) so that the residual medium canflowthrough the filling and venting bores into a col-lectingpan.

Loosen hexagon screws (901.03) and screw out.

Dismount casing cover (161...) from the bearingbracket (330.01), and remove over the shaft(210.01).

Remove gasket (400.03) from the sealing surface,and clean sealing surfaces.

Loosen sockethead cap screws (914.08) andscrewout.

Remove bearing cover (360.02) on the drive sideover the shaft (210.01).

Remove circlip (932.04) and distance washer(551.05) from the shaft (210.01).

Dismountshaft (210.01) towards the pump side withthe groove ball bearing (321.01) and the rotatingpart of the mechanical seal.

Remove distance washer (551.04) over the shaft(210.01).

Concentricallyremove rotating part of the mechan-ical seal over the shaft (210.01).

Remove circlip (932.02) from the shaft (210.01).

Withdraw groove ball bearing (321.01) from the

shaft (210.01). Use pulloff device!

Dismount driveside groove ball bearing (321.02)from the bearing bracket (330.01).

Dismount stationary seal ring (433.01) with Oringtowards the pump side from the bearing bracket(330.01).Note:Particularly see to it that the stationary sealring is pulled out concentrically and not canted toavoid damages to the stationary seal ring.

Clean shaft (210.01) mainly within the area of theshaft seal, the bearing and coupling seats.

Cleanbearing bracket (330.01)within the area of thestationary seal ring and the bearing seats.

7.2.2 Mounting the centrifugal pumpBeforeremounting check all parts for wearand, as necessary, replace with original

replacement parts.Clean all parts before mounting. Always fit newgaskets.

7.2.2.1 Mounting the groove ball bearings and the shaftseal, design mechanical seal U5AThetable below shows the allocation of the pump sizestothe bearing bracket size and the groove ball bearingsto be installed.Note:Always use new groove ball bearings.

Pumpsize

Bearingbracket size

Groove ball bearingAbbreviation

2516025200

2/252003216032200

2/32200

401604020040250

2/40250501605020050250

2/50250651606520080160

100160

360

6306 J C4DIN 625

Part No. 321.01Lubrication by:Liquid pumped

Part No. 321.02Lubrication by:Grease filling

65250653156540080200

8025080315100200100250100315125250

470

6308 J C4DIN 625

Part No. 321.01

Lubrication by:Liquid pumped


80400100400125315125400150250150315150400200400

530

6410 J C4DIN 625



200315200400250315250400

650

6413 J C4DIN 625



Checkshaft (210.01) for wear, particularly within thearea of the packing rings and the mechanical seal.

The groove ball bearing (321.02) to be installed in

thebearing bracket (330.01) on the drive side mustbeprovided with a special grease filling (please referto Section 7.1.2.1. above).

8/9/2019 NTT OM.pdf

17/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 17

Insert new Oring for sealing the stationary seal ringinto the cleaned seat in the bearing bracket(330.01).

Push stationary seal ring into the Oring.Note:In case of bearing bracket sizes 530 and 650,mindthe location of the clamping sleeve (531.01) as

torsion protection.

Install washer (550.01) in the cleaned seat of thebearing bracket (330.01).Note:The washer must sit close in the seat of thebearing bracket and must not protrude.

Premount the shaft as follows:

Concentrically push groove ball bearing (321.01)from the pumpside shaft end over the shaft(210.01) to the bearing seat.

Mount circlip (932.02) in the shaft key provided forthese purposes.

Concentricallypush rotating part of the mechanicalseal with new Oring onto the shaft (210.01).Note:Mechanical seals are highquality precisionparts. During mounting, careful handling and ex-tremecleanliness are a condition of proper function-ing.

Pushpremounted shaft (210.01) fromthe pump sideinto the cleaned bearing bracket (330.01).

Push spacer sleeve (525.02) onto the shaft(210.01).Note:Required only for pumps with bearing bracket

sizes530 and 650.

Pushsupporting washer (551.04) from the drive sideonto the shaft (210.01) against the shaft collar.

Pushthe groove ball bearing provided with a greasefilling (321.02) over the shaft (210.01) onto thecleaned bearing seat of the bearing bracket(330.01).

Place distance washer (551.05) over the shaft(210.01)in front ofthe groove ball bearing (321.02).

Mount circlip (932.04) in the shaft key provided for

these purposes.

Bymeans of the sockethead cap screws (914.08),fix bearing cover (360.02) to the bearing bracket(330.01).

Place new gasket (400.03) on the casing cover(161...).

Push casing cover (161...) over the shaft (210.01),and by means of the sockethead cap screws(901.03), fix to the bearing bracket (330.01).

Mount key (940.02) in the shaft (210.01).

Heat coupling half (without rubber buffers) to ap-prox.100C.

Covershaft end with a filmy coat of molybdenum dis-ulfite (e.g. Molykote).

Push heated coupling half onto the shaft end, and

tighten hexagon socket with cup point.

7.2.2.2 Mounting the safety stuffing box

Followingthe cleaning of the shaft sealingchamber,bend the two packing cord sections (461.01) inannularshape and push over the shaft (210.01). Thekerfs are to be staggered by 180.Note:By means of an appropriate tool (pipe), pressthe inserted packing rings together so that the dis-tance washer (551.01) and circlip (932.01) can bemounted as provided.

Place distance washer (551.01) over the shaft infront of the packing rings (461.01).

Installcirclip (932.01) over the shaft (210.01) in thegroove provided in the casing cover (161...).

7.2.2.3 Mounting the intermediate ring in pump sizesequipped with same.

Insert new gasket (400.01) in the intermediate ring(509.01).Note:To facilitate mounting, we recommend to coatthe gasket with an appropriate adhesive.

Apply intermediate ring (509.01) with gasket(400.01)over the shaft (210.01) to the casing cover(161.01),and screw down by means of the socket

head cap screws (901.01).

7.2.2.4 Mountingthe impeller in a singlestage centrifugalpump


Push impeller (230.01) over the key (940.01) ontothe shaft (210.01).

Place spring ring (936.01) and/or spring washer(934.01) over the shaft (210.01) in front of the im-peller (230.01).

Turn impeller nut (922.01) onto the shaft (210.01),

andtighten.Note:For tightening the hexagon nut, hold the shaftwith an appropriate tool over the coupling half.

7.2.2.5 Mounting the impellers in a twostage centrifugalpump


Push impeller first stage (230.02) over the key(940.01) onto the shaft (210.01).

Placespring ring (936.01) over the shaft (210.01) infront of the impeller first stage (230.02).

8/9/2019 NTT OM.pdf

18/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 18

Turn impeller nut (922.01) onto the shaft (210.01),andtighten.Note:For tightening the hexagon nut, hold the shaftwith an appropriate tool over the coupling half.

Mount stage casing (108.01) with installed diffuser(171.01)over the impeller first stage (230.02) in the

centering of the casing cover (161.02).Note:See to it that one of theback vanes at the dif-fuseris between the stopping cams cast in the stagecasing.

Push impeller second stage (230.03) onto impellerfirst stage (230.02).Note:The engaging dogs of the impeller secondstagemust catch the engaging dogs of the impellerfirst stage.

By means of the pintype face spanner, turnthreaded ring (514.01) onto the impeller first stage(230.02).Note:Prior to turning onto the impeller, coat threadofthe threaded ring with molybdenum disulfite (e.g.Molykote).

Screwhexagon sockets with cup points (904.05) astorsion protection into the threaded ring (541.01).

7.2.2.6 Mounting the cartridgeunit pump

Insert new gasket (400.01) in the volute casing(102.01).Note:To facilitate mounting, we recommend to coatthe gasket with an appropriate adhesive.

Push cartridgeunit pump consisting of impeller,

shaft, casing cover, intermediate ring etc. (depend-ing upon the design) with the bearing bracket(330.01) into the centering of the volute casing(102.01).In doing so, the gasket (400.01) must notbe displaced.

By means of the hexagon screws (901.01) andhexagon nuts (920.01), fix the complete cartridgeunit pump to the volute casing (102.01). In case ofdesign with intermediate ring, use hexagon screws(901.02).

Following the mounting the centrifugal pump, thefollowing operations are to be performed.

Align coupling (please refer to Section 5.4 above).

Attachmanometer pipelines, manometer and hold-ing devices to the pump.

Attach protection against accidental contact andsupportingfoot.

Fill pump with liquid to be pumped.

The power supply cable must be connected to themotorby an authorized electrician. Electrical dangermust be eliminated! Pay attention to direction ofrotation.

Start up pump as per instructions in Section 6.

7.3 Replacement partsWe recommend stocking parts for two yearscontinuousoperating conditions as per the applicationguidelinesin the VDMA data sheet 24 296 (see Section7.3.2).

However, for operational safety reasons, werecommendyou always stock a complete installationorstandbypump.Theadvantage is that in the event of a fault or damagethe standby unit can replace the nonfunctioning unitquickly and without great effort.

7.3.1 Ordering spare/replacement partsWhen ordering spare and replacement parts, besidesthe part number, denomination and quantity, thefollowing should also be quoted:

Pump abbreviation,Pump number,Year of construction.

This information is engraved on the rating plate of thepump.

8/9/2019 NTT OM.pdf

19/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 19

7.3.2 Replacement parts for twoyear continuous operation as per VDMA 24 296

PartNo. Part denomination Number of identical pumps (including standby pumps)

2 3 4 5 6 und 7 8 und 9 10 und mehr

Set/Replacement parts quantity

171.01 Diffuser (Pump sizes :2/25200, 2/32200,2/40250, 2/50250)

1 1 2 2 2 3 30%

210... Shaft with distance washer 551.04distance washer 551.05impeller nut 922.01circlip 932.02circlip 932.04spring ring 936.01spring washer 934.01key 940.01key 940.02

1 1 2 2 2 3 30%

230.02230.03

Impeller first stage andImpeller second stage with threaded ring 514.01(Pump sizes:

2/25200, 2/32200,2/40250, 2/50250)

1 1 1 2 2 3 30%

230.01 Impeller (all singlestage pump sizes) 1 1 1 2 2 3 30%

321.01321.02

Groove ball bearingGroove ball bearing

11

11

22

22

33

44

50%50%

Cartridgeunit pump, consisting of:Bearing bracket, casing cover, shaft,groove ball bearing etc...

1 2

400.01400.02

400.03

Gasket (set)Gasket(Pump sizes :

2/25200/01, 2/32200/01,2/40250/01, 2/50250/01)

Gasket (set)

44

4

66

6

88

8

88

8

99

9

1212

12

150%150%

150%

433.01 Mechanical seal, complete 2 3 4 5 6 7 90%

461.01 Stuffing box packing as set, consisting of:2 packing cord sections for allbearing bracket sizes

2 2 3 3 3 4 40%

Can be purchased as assembly group/sale group.

8/9/2019 NTT OM.pdf

20/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 20

8 Operating Faults, Causes and Remedial Action

8.1 Faults with reference number for cause and remedial actionThe table below is intended as a guide to identifying faults and their possible causes.

Iffaults occur which are not listed here, or which cannot be traced back to the listed causes, we recommend consulting the

factory, or one of our branch offices or sales offices.

The pump must be depressurized and drained when faults are being rectified.

Centrifugal pump faults Reference numbers for cause and remedial action

Delivery rate too low 1, 2, 3, 4, 5, 6, 7, 8, 9, 21, 22

Delivery head too low 2, 3, 4, 5, 6, 7, 8, 9, 21, 22

Power consumption of pump too high 9, 11, 12, 16, 17, 21, 22, 25

Delivery pressure too high 9, 12

Bearing temperature increased 16, 17, 18, 20, 25Pump housing leaky 23

Heavy leakage of shaft seal 13, 16, 17

Pump not operating smoothly 2, 3, 4, 5, 6, 8, 11, 16, 17, 24, 25, 26

Pump gets hot 2, 5, 26

8.2 Causes and remedial action

Ref. no.: Cause Remedial action

1 Counterpressurehigher than design pressure of

pump.

1. Openstop valve in pressurepipeline until operating point is

reached.2. Install impeller with larger diameter.3. Increase rotation speed (turbine, frequenzy control, ...)

2 Pump or pipelines not properly bled or filled. Bleed and top up pump or pipelines.

3 Inlet pipeline or impeller blocked. Clean pipelines and impeller.

4 Air pockets forming in pipeline. Perhaps install a vent valve, or lay pipeline differently.

5 NPSHplant(inlet) too low. 1. Check fluid level in inlet tank.2. Open stop valve in inlet pipeline fully.3. Lay inlet pipeline differently if friction losses are too high.4. Check filter in inlet pipeline, if fitted.

6 Wrong direction of rotation of pump. Reverse polarity of any two phases on motor.

7 Rotation speed too low. Increase rotation speed (turbine, frequenzy control, ...).

8 Excessive wear on inner pump parts. Replace worn parts.

9 Densityor viscosity of delivery medium does notcomply with pump design data.

Consultthe factory in the event of faults due to noncompliancewith design data.

10

11 Delivery head lower than nominal delivery headofpump.

1. Regulateoperating point with stop valve in pressure pipeline.2. Turnoff impeller in event of continuous overload.

12 Rotation speed too high. Reduce rotation speed (turbine, frequenzy control, ...).

13 Shaft seal damaged. Check shaft seal parts for wear and replace if necessary.

14

15 Packing material unsuitable for the deliveryme-dium.Gland is askew, or too loosely tightened.

1. Wrong packing material used. Repack pump with suitablematerial.2. Tighten gland evenly.

16 Pump aggregate wrongly aligned. Realign pump as described.

17 Pump twisted. Check pipelines for twists in connections.

8/9/2019 NTT OM.pdf

21/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 21

18 Excessive axial thrust. Clean relief bore holes in impeller.

19

20 Specified coupling half gap not complied with. Set coupling half gap as per installation diagram.

21 Motor voltage incorrect. Use motor with correct voltage.

22 Motor runs only to two phases. 1. Check cable connection.2. Replace fuses.

23 Screws not tight. 1. Tighten screws.2. Replace gaskets.

24 Impeller outoftrue. 1. Clean impeller.2. Rebalance impeller.

25 Groove ball bearing defective. Replace groove ball bearing.

26 Delivery rate below minimum. Increase delivery rate to minimum.

Consult factory

8/9/2019 NTT OM.pdf

22/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 22

Sectional drawing for singlestage sizesSizes at bearing bracket size 360 and 470

Design with intermediate ring

Sizes at bearing bracket sizes530 and 650

Shaft seal: Uncooled, unbalanced mechanical sealwith premounted saftey stuffing box

Abbreviation: U5A

View X

8/9/2019 NTT OM.pdf

23/24

NTT ALLWEILER

VM 460.0008 GB/12.98 IdentNr. 550 102 23

Sectional drawing for twostage sizesSizes at bearing bracket size 360

Denomination PartNo.Volute casing 102.01Stage casing 108.01Casing cover 161.01Casing cover 161.02Diffuser 171.01Supporting foot 183.01

Shaft 210.01Shaft 210.02Impeller 230.01Impeller first stage 230.02Impeller second stage 230.03Groove ball bearing 321.01Groove ball bearing 321.02Bearing bracket 330.01Bearing cover 360.02Gasket 400.01Gasket 400.02Gasket 400.03Joint ring 411.02Joint ring 411.06Joint ring 411.07Joint ring 411.09Mechanical seal 433.01

Stuffing box packing 461.01Intermediate ring 509.01Threaded ring 514.01Spacer sleeve 525.02Clamping sleeve 531.01Washer 550.01

Denomination Part No.Distance washer 551.01Distance washer 551.04Distance washer 551.05Rivet 565.01Rivet 565.02Pipe 710.01

Hexagon screw 901.01Hexagon screw 901.02Hexagon screw 901.03Hexagon screw 901.13Stud bolt 902.01Screw plug 903.02Screw plug 903.06Screw plug 903.07Screw plug 903.09Hexagon socket with cup point 904.05Sockethead cap screw 914.08Nut 920.01Impeller nut 922.01Circlip 932.01Circlip 932.02Circlip 932.04Spring washer 934.01

Spring ring 936.01Key 940.01Key 940.02Key 940.03Name plate 971.01Information plate 972.01

ConnectionsFD Fluid drainFF FillingLO Leakage outletV Bleeding

Shaft seal: Uncooled, unbalanced mechanical sealwith premounted saftey stuffing box

Abbreviation: U5A

8/9/2019 NTT OM.pdf

24/24

NTT ALLWEILER

Subject to technical changes.

ALLWEILER AG

Werk Radolfzell

Postfach1140D78301 RadolfzellAllweilerstrae 1D78315 Radolfzell

Germany (++ 49) 7732 86 0Fax (++ 49) 7732 86 436Email: [email protected]:http://www.allweiler.de

ntt om.pdf

Documents