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Pag2

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1. GENERALSAFETYRULESANDMACHINERYDESCRIPTION

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1.1 GeneralSafetyuse:

Thecontentofthismanualistobeconsideredasanintegrationtothegeneralsafetyrulesappliedinyourcountry,intheenvironment

youareworkinginandalsototherulestobefollowedbylaw.Incaseofconflictwithanyofthepreviouslymentionedrul

esinplace,

pleasecontactourtechnicalofficeforalternativeproceduresthatwillnotcreateconflict.

Always remember that any operation with mechanical machinery could be dangerous and make sure all possible precautions are

followedbeforeandduringassembly&maintenance.SAFETYFIRST!

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 1.2 Generaldescription

Closedcircuitcool

ingtowersoftheRAAseriesarecounter‐flowinduceddraughtcoolerswiththefluidtobecooled(primarycircuit)

circulatinginaclosedsealedloop.

Thefluidtobecooledpassthroughacoil,externallysprayedcontinuouslywithwater,pumpedinanopencircuit(secondarycircuit)

fromthecollectionwaterbasin.Theevaporationofpa

rtofthiswaterremovesmostoftheheatfromthefluidintheprimarycircuit.

Evaporationisachieved thanks to a high quantity of air moved, by the use of axial fan(s)  installed ontop of the unit,counter‐flow

againstthewaterofthesecondarycir

cuit.

Theclosedcircuitcoolingtoweriscomposedbythefollowingelements:

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 Primarycircuit:

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 • Coil

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 Secondarycircuit:

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 • Waterpumpingsystem

 • Waterdistributionsystem

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 Other:

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 • Airsystem

 • Casing,watercollectionbasin,airintakeandlouverpanels.

 • Drifteliminator

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 1.3 Primarycircuit(coil)

Coil is made by high quality carbon steel bended and welded. A further process of hot dip galvanization assures the necessary

protectionagainstexternalcorrosion.Coilcanbesuppliedonrequestinst

ainlesssteelboth304and316grade.

Duringassemblythecoilistestedinaccordancetoactualrules(PED).Afurthertest isdonebeforefittingthecoilintothemachine.

Differenttestproceduresorwitnessedtestsarepossiblewithextracosts.

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 1.4 Secondarycircuit

 1.4.1 Wat

erpumpingsystem

Theexchangecoilissprayedwithwatercollectedfromthebasinoftheunitandpumpedbytheuseacent rifugalpumpinside

a water distribution system. The motor of the pump is directly coupled on the bronze impeller and installed in a vertical

positionfacilitatinginspection andmaintenance.Thewateristhencol

lectedinthebasinoftheunitandreadytobepumped

again,afterpassingthroughastainlesssteelfilter/strainerinstalledinthebottomofthebasin.

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1.4.2 Waterdistributionsystem

Waterispumpedinthetopoftheclosedcircuitcooleranddistributedth

roughagalvanisedsteelcollectorandpolypropylene 

(PP)pipenetwork.ItcouldalsobesuppliedinStainlessSteelwithextracost.

Spraynozzles(madebystaticfibreglassreinforcedpolypropylene)arescrewedintothePPpipesandallowwatertodroponto

thecoil.Nozzleshaveawidewaterpassage,withminimumpossibilit

iesofclogging,breakingdownorblocking.Thedesignof

thenozzlesisstudiedtoallowtheperfectwaterdistribution(fullcone)overthecoil.

Incaseofcloggingorbreakingorjustforsimplemaintenance,theycanbedissembledfromthePPpipesan deasycleanedor

replaced.

Make‐up water

, to replace depletion through evaporation or elimination to avoid scaling, is carried out automatically by

meansofanintakevalveinstalledinthebasin.

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 1.5 Airsystem

Airissuppliedincounter‐flowtothewaterandisprovidedbyaxial fan(s)staticallyanddynamicallybalanced,installedatthetopof

thec

oolingtower(induceddraught).

The fan can be manufactured in different materials (PP, Aluminium, etc.) being place d inside the diffusers, which can also be

manufacturedind i fferentmaterialslikepaintedgalvanisedsteel(standard)orstainlesssteel.Anarrowindicatesthefandirectionto

beused.Inorde

rtoprotectthefanfromanyexternalobjectandtopreventinjuriesastainlesssteelsafe‐guardgridisinstalledinthe

upperpartofthediffuser.

Theelectricmotor(s),totallysealedandself‐ventilated,areprovidedstandardwithclassFinsulation,capableofwithstandinga

temperatureof155°C.Electricmot

orsareinaccordancetotheEU690/2009norm(ifapplicable).Runningspeedcanvaryin

accordancetoeachsinglemachineprojectspecification.Specialmotorscanbefittedondemand.Motor(s)aremountedona

galvanizedsteelsupportorplate,andinstalledinsidethecoolingtower,justbelowthefan.

In order to elim

inate frictions,wearing or unnecessary maintenance (typical of anindirect coupling)the coupling between electric

motor(s)andfan(s)isdirect.

Betweenthecoil(s)andfan(s),alayerofdrifteliminatormadebyPVCisprovided.

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