Preparedby

AartiMeena,Engineer(QABOI)

RE

Appmixt

Tech

Majevap

Wor

coo

gas

Pre

effic

FRIGER

plication:utureprese

hnicalspe

DryerInletPInletTOutletSupply

jorCompoporator,d

rkingprinc

ledbyoutg

heatexcha

coolingre

cientrefrig

RATION

usedforelientinTurbo

cification:

CapacityPressureTemperaturetdewpointatyvoltage

onents:itisraincollect

ciple:Hyd

goingrefri

anger.

emovessom

gerationco

GASDR

minatingmoGenerato

(Max.)tlinePr.

saskidmotor,compr

rogengas

gerantine

meofthe

ondensing

RYER:

moisturefrorcasing.

ountingunressor,con

saturated

economize

heatload

section.

romhydro

nitconsistinndenser,pr

withwate

er(precool

fromthei

ogen/air/

: 40M3/HR: 5KG/cm2:60Deg.C.:+3to+5De:415VAC,3p

ngofFreonressuresw

ervapour,

er),asmo

incomingg

/carbondi

(g)

eg.CatlinePphase,50Hz.

nchiller,Pwitchetc.

,entersdr

othsurfac

gasallowin

oxideorth

Pr..

Precooler,

ryer inleta

ce,nonfou

ngtheuse

heir

and ispre

ulinggasto

ofamore

o

e

Theprecooledgasthenpassesthroughasmoothsurface,Nonfoulingairtorefrigerantheat

exchangerChiller (refrigerantevaporator),where it iscooledto+3 5degreecentigradeby

givingupheattorefrigerationsystem.

Now the hydrogen gas passes through the moisture separator, where the water is

separated from thegasanddischarged regularlythroughtheautodrainvalve.Thecoldgas

thenexitsatoutlet,after ithaspassed through theothersideofgastogasheatexchanger,

(economizer)where it iswarmed by the incominghotgas.Thisreheating increasesthegas

effectivevolume(enablingittodomorework)andpreventspipesweatingdownstream.(The

driedgastravels through the activated carbon filter), gas stream does not fallbelow the

temp. towhich itwaschilled inthegastorefrigerantheatexchanger(referred to as dew

point temp.) and hence no more water vapour will condense into troublesome

liquid.Removingthewaterallowsyoutokeeppipelines,gastools,valvesandcylinders,spray

guns,pneumatic instrumentsandanygasoperateddevicecleananddry.

Pressure switch: A pressure switch is provided to control discharge pressure by means of

controlling the condenser fan. It is sensing the discharge pressure and giving command to

condenserfantoONorOFF.Thiswillalsosaveenergyduringwinterseason.

Testing:

Hydraulictestofevaporatorunitandprecoolerunitat15Kg/cm2for30minutes.

Pneumatictestofevaporatorandprecoolerunitat10Kg/cm2for8hours.

HydraulictestofcompleteH2circuitat10Kg/cm2for30minutes.

PerformancetestofcompleteH2circuitat10Kg/cm2for8hours.

Hydraulic test of refrigerant circuit exchanging compressor at 15 Kg/cm2 for 30

minutes.

10% radiographyofbuttweldsand100%DPTof filletweldofprecooler,evaporator

unitandanyweldinginH2circuit

Highvoltageandinsulationresistancetestofcontrolpanel.

Performance test shall be demonstrated checking for proper functioning is to be

carried by supplying air through the drier. The thermostats of the gas drier should

switchoffthecompressorassoonas3Ctemperatureachieved intheevaporatorand

when the temperature again reaches 56C, the compressor / cooling should start.

Duringfunctionaltest,operationofinstrumentshallalsobechecked.

PRESSURESWITCH:

A pressure switch is provided to control discharge pressure bymeans of controlling the condenser fan. It is

sensingthedischargepressureandgivingcommandtocondenserfantoONorOFF.Thiswillalsosaveenergy

duringwinterseason.

INSTALLATION:

ConnecttheElectricalconnectiontotheDryer

Connect the Hydrogen Gas inlet & outlet: Hydrogen gas inlet and outlet: Connect

hydrogengaslinestogasinletandgasoutletlocatedandidentifiedonthesideofthecabinet.

Pipingandarrangementswouldincludeinletandoutletvalvesandalsoasuitableairbypassif

desired.

NOTE:

TheDryerpressureshouldnotdropbelow5Kg/Cm2(g)asthelowerpressuredegrades

theoutletdewpoint.

Inlettemperatureshouldnotexceed60Deg.C.asthehighertemperaturedegradesthe

outletdewpoint.

Checkforgasleaksatpipingconnections.

Ensuretheindicatorsandgaugesareoperatingproperly.

Allow the unit to run for several hours. Then check to see if drying is being

accomplished.ThiscanbedonebyreleasingthecompressedairfromMoisture

Separatorthroughmanualdraincondensateremovaltrap.

Properly installedandoperating,thedryerrequiresaminimumofcaretobeprovided

formanyyearsofreliableservice.Aregularmaintenanceprogramwilladdtothelifeof

the dryer and prevents problem with your compressed air system. Regular

maintenanceproceduresshouldincludedailymonitoringofdryeroperations.

Onair cooledmodels,blowingoutand cleaningofdirtanddust from theair cooled

refrigerationcondensingunitandespeciallytherefrigerationcondensermonthlyoras

requireddependingonconditionoftheareainwhichdryerisinstalled.inexceptionally

dirty location,a furnace type filter installation frontof the refrigeration condenser is

recommended. It should be kept clean in order to maintain free air flow across

condenser.

Donottamperwithrefrigerationsection.Settingsmadeatthe factoryare fornormal

conditions.Whereconditionsareunusual,consultmanufacturer'stodoneedful.

Usestabilizedvoltagetopreventabnormalelectricalcomponent/compressorfailure.

CLEANINGOFCONDENSER(AIRCOOLEDTYPE):

It isrecommendedtocleanthecondenserevery13monthsdependinguponyoursite

condition.Thedustparticlessettledinsidethefinnesofthecondensertobecleanedfor

efficiency improvement.Forcleaningblowcompressedairatapressureof12kg/cm2

through the finnesor spraywater jet / soap solution through the finnes.During this

cleaningshutdowntheunit&electricalparts.

REFRIGERANTLEAKAGERECTIFICATION:Ifanygasleakageisthereinthesystemproper

coolingcannotbeachievedandsuctionpressurewillshowthe lesserthanrequired. If

excessgasisleakedoutthenlpswitchwilltripthesystem.torectifytheleakageofthe

systemconsultwithaqualifiedrefrigerationengineer.

VACUUM&GASCHARGING:Forvacuumandgascharginggoodexperienceisrequired

in refrigeration.Therefore it is recommended toconsultwithaqualified refrigeration

engineeranduseonlyproperevacuationtechnique.

COMPRESSORREPLACEMENT:Duringcompressorreplacementthedryertobereplaced

andthewholerefrigerantpipestobeflushed.Thenvacuumandgascharging istobe

done.Thereforeitisrecommendedtoconsultwithaqualifiedrefrigerationengineer.