PIETRO FIORENTINI Dival SQD-6 Owner's manual

Type
Owner's manual
IT
Pressure Regulators
Dival SQD-6
INSTALLATION ,COMMISSIONING
AND MAINTENANCE ISTRUCTIONS
TECHNICAL MANUAL
3
Dival SQD-6 - MT 224-E - 02-2020
ENPoster
Inlet pressure
Outlet pressure
Dival SQD-6
4
Dival SQD-6 - MT 224-E - 02-2020
ENPRECAUTION
GENERAL PRECAUTION
The apparatus described in this manual is a device subject to pressure installed in systems under pressure;
 Theapparatusinquesonisnormallyinstalledinsystemsfortransporngammablegases(naturalgas,forexaple).
PRECAUTION FOR THE OPERATORS
Beforeproceedingwithinstallaon,commissioningormaintenance,operatorsmust:
• Examinethesafetyprovisionsapplicabletotheinstallaoninwhichtheymustwork;
• Obtaintheauthorisaonsnecessaryforworkingwhenrequired;
• Usethenecessarymeansofindividualprotecon(helmet,goggles,etc.);
• Ensurethattheareainwhichtheyoperateisedwiththemeansofcollecveproteconenvisagedand
withthenecessarysafetyindicaons.
PACKING
Thepackingfortransportaonofequipmentandofrelevantsparepartsaredesignedandshapedtoavoiddamageto
anypartduringtransportaon,warehousingandhandlingacvies.Thereforetheequipmentandsparepartsshallbe
keptintotheirpackingunltheirinstallaoninthenalsite.Aerpackingisopen,checkthatnodamageoccurredto
anygoods.Ifdamageoccurredinformthesupplierandkeeppackingforanyvericaon.
HANDLING
Thehandlingoftheapparatusandofitscomponentsmustonlybecarriedoutaerensuringthattheliinggearis
adequatefortheloadstoli(liingcapacityandfunconality).Theapparatusmustbehandledusingtheliingpoints
providedontheapparatusitself.
Motorisedmeansmustonlybeusedbythepersonsinchargeofthem.
INSTALLATION
Theinstallaonofthepressureregulatorhastooccurincompliancewiththeprovisions(lawsorstandards)inforcein
theplaceofinstallaon.
Indetail,naturalgasplantshavetoshowfeaturesincompliancewiththelawprovisionsandstandardrequirementsin
forceintheplaceofinstallaonoratleaseincompliancewithstandardsEN12186orEN12279;indetail,itisneces-
sarytomeettheprovisionsofparagraphs6.2,7.5.2,7.7,9.3ofthestandardEN12186and6.2,7.4,7.6,9.3oftheEN
12279standard.Theinstallaonincompliancewithsuchstandardsminimizestheriskofrehazardandtheformaon
ofpotenallyexplosiveatmospheres.
Thevalveisnotequippedwithexternalpressurelimitaondevices;therefore,ithastobeinstalledmakingsurethat
theoperangpressureof theassembly on whichit is installeddoesnot exceedthemaximumallowablepressure
(PS).
Therefore,theuser,asdeemednecessarybythesame,shallinstallontheassemblysuitablepressurelimitaonsy-
stems,aswellasprovidetheplantwithsuitablereliefordrainsystemsinordertodischargethepressureanduid
containedintheplantbeforeproceedingwithanyinspeconandmaintenanceacvity.
Iftheinstallaonoftheapparatusrequirestheapplicaonofcompressionngsintheeld,thesemustbeinstalled
followingtheinstruconsofthemanufacturerofthengsthemselves.Thechoiceofthengmustbecompable
withtheusespeciedfortheapparatusandwiththespecicaonsofthesystemwhenenvisaged..
START UP
Commissioningmustbecarriedoutbyadequatelytrainedpersonnel.
Duringthecommissioningacvies,thepersonnelnotstrictlynecessarymustbeorderedawayandtheno-goarea
mustbeproperlysignalled(signs,barriers,etc.).
Checkthatthesengsoftheapparatusarethoserequested;ifnecessary,resetthemtotherequiredvaluesinaccor-
dancewiththeproceduresindicatedinthemanual.
Whencommissioning,therisksassociatedwithanydischargesintotheatmosphereofammableornoxiousgases
mustbeassessed.
Ininstallaonsinnaturalgasdistribuonnetworks,theriskoftheformaonofexplosivemixtures(gas/air)insidethe
pipingmustbeconsidered.
COMPLIANCE WITH DIRECTIVE 2014/68/EU (PED)
TheSQD-6regulatorsareclassiedasFailOpenregulatorsandasDierenalStrength(DS)accordingtoEN334and
arethereforedeniedassafetyaccessoriesaccordingtoDirecve2014/68/EU(PED).
5Dival SQD-6 - MT 224-E - 02-2020
E INDEX
1.0 INTRODUCTION 6
1.1 Mainfeatures 6
1.2 OperaonofthepressureregulatorSQD-6 6
1.3 Sengsprings 8
2.0 INSTALLATION 9
2.1 General 9
2.2 Connecngtheapparatuses 10
2.3 Downstreamvolumerequiredforinstallaon 11
3,0 MODULARITY’ 11
3.1 LA/..Incorporatedslam-shut 11
3.2 LA/..Slam-shutsengsprings 13
4.0 ACCESSORIES 14
4.1 ReliefValve 14
4.1.1 Directinstallaonintheline 14
4.1.2 Installaon 15
5.0 STARTUP 15
5.1 General 15
5.2 Gasinput,controlofexternalghtnessandseng 16
5.3 Commissioningtheregulator 17
5.4 CommissioningtheregulatorwithincorporatedLA/..Slam-shut 17
6.0 TROUBLE-SHOOTING 19
6.1 Table5regulatorSQD-6 20
6.1 Table6slam-shut 20
7.0 MAINTENANCE 21
7.1 General 21
7.2 SQD-6regulatormaintenanceprocedure 22
7.3 Replacementthean-pumpingvalve 29
7.4 LA/..Slam-shutvalve 33
8.0 FINALOPERATION 34
8.1 Checkingtheghtnessandseng 34
8.2 Startup 34
6
Dival SQD-6 - MT 224-E - 02-2020
ENDESCRIPTION
1.0 INTRODUCTION
Thescopeofthismanualistoprovidetheessenalinformaonfortheinstallaon,commissioning,disassembly,re-
assemblyandmaintenanceofSQD-6regulators.
Itisalsoappropriatetoprovideabriefillustraonofthemainfeaturesoftheregulatorandofitsaccessories.
1.1 MAIN FEATURES
The SQD-6pressureregulatorisapressureregulatorforpreviouslycleanedgaseousuidsandissuitableformedium
andlowpressures.
The SQD-6isanormallyopenregulatorandconsequentlyopensintheeventof:
- Breakageofthemaindiaphragm;
- Noregulatedpressuresignal.
Themainspecicaonsofthisregulatorare:
DesignpressurePS: upto6bar
Specicmaximumallowablepressure
(actuatorcasing)PSD: 0,5bar
OperangTemperaturerange: -20°Cto+60°C
AmbientTemperaturerange: -20°Cto+60°C
Inletpressurerangebpu: from0,2to6bar
PossibleregulaonrangeWd: 10to300mbar;
Minimumdierenalpressure: 0,1bar
Accuracy class AC upto10(accordingtotheoutputpressureeld);
LockuppressureclassSG: upto20(accordingtotheoutputpressureeld)
Mainfeature TAB.1
1.2 OPERATIONOFTHEPRESSUREREGULATORSQD-6(g.1)
Inabsenceofpressuretheobturator3iskeptinopenposionfromthehookofsha9onthesideofthelevers13
(g.1).TheoutletpressurePdischeckedthroughthecomparisonbetweentheloadofthespring43andtheimpulse
oftheoutletpressureonthemembrane19.
Inthiscomparisonareinvolvedalsotheweightofthemobileequipmentandthedynamicthrustsontheobturator.
Theupstreampressure,althoughitisvariable,hasnotanyinuenceonthebalanceoftheobturator3,sincethislaer,
duetothepresenceoftheholeA,isposionedbetweentwoequalpressuresacngonequalsurfaces.
Themovementofthediaphragm9istransmiedbytheleversystem13tothestem9andhencetotheobturator3.
Theobturator3isedwithavulcanizedrubbergaskettoensureperfectghtnesswithzeroowratedemand.
If,duringoperaon,thedownstreampressuredrops,theforceitexertsonthediaphragm19becomeslowerthanthe
loadofthespring43.Thediaphragmthereforedropsand,bymeansoftheleversystem13,pullstheobturator3away
fromthevalveseat2.Thegasow,therefore,increasesunltheinialpressureset-pointisrestored.
If,ontheotherhand,thedownstreampressurebeginstoincrease,theforceexertedonthediaphragm19exceeds
theloadthespring43.Theobturatoristhereforedisplacedtowardstheclosedposion,returningthedownstream
pressuretheset-point.
Innormalworkingcondions,theobturator3isposionedinsuchawayastomaintainthepressurePdaroundthe
selectedset-point.
Toadjust thepressureset-pointyouconturn theinternaladjustmentring 28appropriately,clockwisetoincrease
andanclockwisetoreduceit.Normallytheplugisonlyusedthecoverthelowerbandofthevarioussengranges;
theadjusngscrewisusedforthehighervalues.Thepressureregulatorisequippedwithtwoan-pumpingdevices
33and34(g.1),whichareinchargeofslowingdowntheinow/oulowofthegas/airintheheadonlyduringthe
transitoryphases,inordertoavoidpossibleoscillaonphenomenaoftheregulatedpressure.
TherearealsotwostopsV1andV2forthepurposeofeliminangdamagingeectswhichcouldderivefromaccidental
over-pressuresbelowthediaphragm19orfromoverloadingofthespring43.
Usually,asoluonofthetypeshowning.2aisadoptedinordertoprotecttheobturatoragainstdamagesresulng
fromsuddenincreasesoftheregulatedpressure.
7Dival SQD-6 - MT 224-E - 02-2020
EN DESCRIPTION
Infact,thissoluonallowsthediaphragmprotecondisc20torestontheupperstrokeendV1exceeding
theloadofthespring42andthusreleasingtheobturatorfromtheloadresulngfromthesuddenpressure
increase.
Inordertopreventsmallleaksatnullrequiredowrateorthatsuddenandtemporaryoverpressures,re-
sulngforexamplefromfastmanoeuvresorgasoverheang,maylettheslam-shutvalvetrip,thesoluon
shownbyg.2acanbetransformed,uponrequest,intoanembeddedreliefvalve,eliminangtheO-ring
73andaddingthering70(g.2b).
Itsoperaonisdescribedasfollows:withclosedregulator,anyoverpressureslithediaphragmprotecon
disc20exceedingtheloadofthesprings42and43.Inthisway,agivenquantyofgasisdischargedthrough
theseatZofthereliefvalve.
2
2
3
3
A
A
9
9
19
19
33
33
34
34
43
43
28
28
20
20
V1
V1
13
13
V2
V2
42
42
513
513
512
512
511
511
503
503
SQD-6Pressureregulator: Fig.1
8
Dival SQD-6 - MT 224-E - 02-2020
ENDESCRIPTION
1.3 Tab. 2 SETTING SPRINGS
 Table2showsthecalibraoneldsofthedierentforeseensprings.
SPRINGS CHARACTERISTICS SQD-6
Code Colour De Lo d Sengrange(mbar)
64470256RO RED 39 140 2.2 10-15
2700525* ORANGE 22 40 2
64470382NE BLACK 39 160 2.5 15-27
2700525* ORANDE 22 40 2
64470301GI YELLOW 39 145 2.8 27-40
2700525* ORANGE 22 40 2
64470302VI PURPLE 39 140 3.8 40-90
2700645* RED 22 40 2.3
64470262AR ORANGE 39 140 4.5 90-170
2700645* RED 22 40 2.3
64470398AZ LIGHTBLUE 39 140 5 170-300
2700645* RED 22 40 2.3
De=externaldiameterd=wirediameterLo=length*=forinternalreliefvalve
Springs Tab.2
Fig.2a Parcularspring Fig.2b
9Dival SQD-6 - MT 224-E - 02-2020
EN INSTALLATION
2.0 INSTALLATION
2.1 GENERAL
Pressureregulatordoesnotrequireanysupplementaryupstreamsafetyaccessoryforproteconagainstoverpressu-
recomparedwithitsdesignpressurePS,whenupstreamreducingstaonissizedforamaxdownstreamincidental
pressure MIPd≤1,1PS.
Beforeinstallingtheregulatoritisnecessarytoensurethat:
- Theregulatorcanbeinsertedinthespaceprovidedandthatsubsequentmaintenanceoperaonswillbesucien-
tlypraccable(seeoveralldimensionsinFig.3);
- Inletandoutletpipingsmustbeatthesamelevelandabletocarrytheweightoftheregulator(seeFig.3);
- Theinlet/outletangesofthepipingare90°;
- Theinlet/outletangesoftheregulatorarecleanandtheregulatoritselfhasnotbeensubjecttodamageduring
transport;
- Thepipingupstreamhasbeencleanedtoexpelresidualimpuriessuchasweldingscale,sand,paintresidues,
water,etc.
Theusuallyforeseenarrangementistheoneindicatedingure4.
135 147
190 204
100
Rp 1/2”
301,5
145
280
Rp 1/4”
Rp 1/2”
Pressureregulatorswithoutslam-shuth: Kg.15
Pressureregulatorswithslam-shut: Kg.16
Overalldimensionsandweights: Fig.3
10
Dival SQD-6 - MT 224-E - 02-2020
ENINSTALLATION
2.2 CONNECTING THE DEVICES
Theconneconsbetweentheapparatusandthemainpipingmustbemadeusingstainlesssteelorcooperpipewith
minimuminternaldiameterof8mm.
DN
2 X ND 4 X ND
Installaonscheme: Fig.4
Pressureregulator
Sensingline
Contolpressuregauge
Bleedcock
On/ovalve
Detailofmulpletake-o: Fig.5
11 Dival SQD-6 - MT 224-E - 02-2020
EN INSTALLATION
Theinstallaonofamulpleplugonaplanthasitsaiminintakingfromasinglepointallthepressureimpulsesignals
thatgotothedierentreducon-safetydevicesandtotheiraccessories.
Theregulatormustbeinstalledinthelinewiththearrowonthebodypoinnginthegasowdirecon.
Itisindispensableforgoodregulaonfortheposionofthedownstreampressuretake-osandthespeedofthegas
atthetake-opointrespectthevaluegiven.
Theregulator,whenusedingaspressurereduconstaons,hastobeinstalledatleastaccordingtotherequirements
setforthbythestandardsEN12186orEN12279.Allpointsforpossiblegasreliefduetopossiblebreaksofsensors/
diaphragmsaretobeconveyedaccordingtostandardsEN12186orEN12279.
Thefollowingisrecommendedsoastopreventtheaccumulaonofimpuriesandcondensateinthelinesofthe
pressuretake-o.
a) Thelinesthemselvesmustslopedowntowardsthedownstreampipingwithaslopeofabout5-10%;
b) Theconnectorsonthepipingmustalwaysbeweldedonthetopofthepipingitselfandtheremustbeoburr
orinwardprotrusionsintheholeinthepiping.
Thespeedofthegasmustnotexceedthefollowingvaluesinthepipingdown-streamfromtheregulator:
Vmax=15m/s
ATTENTION!
2.3 DOWNSTREAM VOLUME REQUIRED FOR INSTALLATION
InthecaseofaserviceregulatoroftheON-OFFtype(stoppingorstarngofburners),youshouldrememberthat
thoughtheSQD-600apparatusisclassiedasbeingofthefastreacontype,itrequiresanappropriatelydimensioned
volumeofgasbetweentheapparatusitselfandtheburnersoastopartlyabsorbthepressureswingscausedbyfast
owratevariaons.
3.0 MODULARITY
Themodular-typeconceponofSQD-6regulatorsmeansthatitisalsopossibletottheslam-shutincorporatedwith
thebodyitselfevenaertheinstallaonoftheregulator.
3.1 LA/.. INCORPORATED SLAM SHUT
Thisisadevice(g.7and8)whichimmediatelyblocksthegasowif,becauseofsomefailure,thedownstreampres-
surereachesthepointsetforitsintervenon,orifitisactuatedmanually.
WaittheSQD-6pressureregulator,theslam-shutbeincorporatedonboththeserviceregulatororonthein-linemo-
nitor.Threeversions(LA/BP,LA/MPandLA/TR)areavailabledependingontheintervenonpressureranges
Themainfeaturesoftheslam-shutdeviceareasfollows:
• DesignpressurePS:upto20bar;
• Intervenonforpressureincreaseand/ordecrease;
• IntervenonaccuracyAG:±5%ofthesetpointforpressureincrease(basedonseng-pressure);±15%of
 thesetpointforpressuredrop(basedonseng-pressure);
internal by-pass device;
• manualbuon-operatedactuangdevice.
N.B. WE RECOMMEND NOT TO PUT ON/OFF VALVES ON THE IMPULSE TAKE-OFFS
ATTENTION!
12
Dival SQD-6 - MT 224-E - 02-2020
58
65
64
61
62
LA/...Slam-shut: Fig.7
ENINSTALLATION
GeneralLay-out: Fig.6
Detail of manual buon
operated actuang de-
vice
N.B.:L’O-ringisusedfor
specicversion.
13 Dival SQD-6 - MT 224-E - 02-2020
EN INSTALLATION
Theslam-shutvalveLA/..consistsessenallyofanobturator(g.7)edonastem,areleasingleversystem,acon-
trolheadandamanualresengsystem.ThepressuretocontrolPd,inchamberCofthecontrolhead,actsonthe
diaphragm46whichisintegralwiththecamsha45.
TheloadofthepressurePdonthediaphragmiscounteredbythesprings34and35whichrespecvelydetermine
intervenonforpressureincreaseandpressuredecrease.Thedeviceissetbyturningtherings17and18.Turningthe
ringsclockwiseincreasestheintervenonvalue;turninganclockwisedecreasesit.
Intervenonasaresultofapressureincreaseoccursasfollows:whenthepressurePdexceedsthesetpointtheload
onthediaphragm4increasesunlitovercomestheresistanceofthespring34.Thiscausesthesha45totranslate
towardsthelesothatthecamshisthefeeler33andtripsthelevermechanism29.Inthisway,thestem5withthe
obturator19isfreedandclosedbythespring8.
IOntheotherhand,intervenonasaresultofapressuredecreaseoccursasfollows:aslongasthepressurePdstays
abovetheloadofthespring35,thespringsupport13restonthesupport12.
IfthepressurePddropsbelowthesetpoint,thespring35translatesthesupport13totherightandwithitthesha
45.
Thecamshisthefeeler33andtripsthelevermechanism29.Theslam-shutisresetbyunscrewingthebushing7and
pullingitdownwardsunltheleversystem29isreset.
Duringtherstphaseoftheoperaon,itwillbenecessarytowaitunltheupstreampressure,throughtheinternal
by-pass,passesdownstreamfromtheobturatortorebalanceit.Aerreseng,thebushing7mustbescrewedback
toitsseat.
Itispossibletoseefromtheoutsidewhethertheslam-shutisopenorclosedbyobservingtheposionofthenut37
throughinthebushing7,asshowningure7.
Table3liststherangeofintervenonofthepressureswitchesavailable.
LA/BP SLAM-SHUT SPRING CHARACTERISTICS
Code Colour De Lo d Sengrangeinmbar
Intervenonformax.pressure
64470112RO RED 34 43 2.2 30÷50
64470115GR GREY 42 2.8 50÷180
Intervenonformin.pressure
64470024BI WHITE 15 45 1.3 6÷60
LA/MP SLAM-SHUT SPRING CHARACTERISTICS
Code Colour De Lo d Sengrangeinmbar
Intervenonformax.pressure
64470115GR GREY 34 42 2.8 140÷180
64470116GI YELLOW 40 3.2 180÷280
64470051BI WHITE 50 3.2 280÷450
Intervenonformin.pressure
64470024BI WHITE 15 45 1.3 10÷60
6470038GI YELLOW 40 2 60÷240
De=externaldiameterd=wirediameterLo=Length
LA/..Slum-Shut Tab.3
3.2 LA/… SLAM-SHUT SETTING SPRINGS
14
Dival SQD-6 - MT 224-E - 02-2020
ENINSTALLATION
4.0 ACCESSORIES
4.1 RELIEF VALVE
Thereliefvalveisasafetydevicewhichreleasesacertainqualityofgastotheexteriorwhenthepressureatthecon-
trolpointexceedstheset-pointasaresultofshort-lasngeventssuchas,forexample,theveryfastclosingoftheon/
ovalvesand/oroverheangofthegaswithzeroowratedemand.Thereleaseofthegastotheexteriorcan,for
example,delayorblocktheintervenonoftheslam-shutvalvesfortransitoryreasonsderivingfromdamagetothe
regulator.
Obviouslythequantyofgasreleaseddependsontheextentoftheoverpressurewithrespecttotheset-point.
Thedierentmodelsofreliefvalvesavailableareallbasedonthesameoperangprinciplewhichisillustratedbelow
withreferencetothevalveVS/AM65(g.8).Itisbasedonthecontrastbetweenthethrustonthediaphragm24
derivingfromthepressureofthegastocontrolandthethrustfromthesengspring20.Theweightofthemobileas-
sembly,thestacthrustandtheresidualdynamicthrustontheobturator4alsocontributetothiscontrast.Whenthe
thrustderivingfromthepressureofthegasexceedsthatofthesengspring,theobturator4israisedandacertain
qualityofgasisreleasedasaresult.
Assoonasthepressuredropsbelowtheset-point,theobturatorreturnstotheclosedposion.
Proceedasindicatedbelowtocontrolandadjustintervenonofthereliefvalve.
VS/AM65: Fig.8
4.1.1 DIRECTINSTALLATIONINTHELINE(g.9).
Whenthereliefvalveseddirectlyinthelinethatis,withouttheinterposionofanon/ovalve,werecommend
proceedingasfollows:
1) Ensurethatthedownstreamon/ovalveV2andthebledcock6areclosed;
2) Connecttothecock6acontrolledauxiliarypressureandstabilizeittothewishedtrippingvalueoftherelief
valve.Openthebleedcock6withafollowingincreaseinthepressureofthedownstreamsecon;
3) Checkintervenonofthereliefvalveandadjustitifnecessarybyturningtheinternaladjustmentring14
appropriately(clockwisetoincreasetheset-point,anclockwisetoreduceit).
15 Dival SQD-6 - MT 224-E - 02-2020
EN INSTALLATION
Directinstallaon: Fig.9
4.1.2 INSTALLATIONWITHON/OFFVALVE(g.10)
1) Closetheon/ovalve16;
2) Connectacontrolledauxiliarypressuretothetake-ovalve17andincreaseitslowlytotheenvisagedinter-
venonvalue;
3) Checkintervenonofthereliefvalveandadjustitifnecessarybyturningtheinternaadjustmentring14
appropriately(clockwisetoincreasetheset-point,anclockwisetoreduceit).
InstallaonWithOn/OValve: Fig.10
5.0 START UP
5.1 GENERAL
Aerinstallaon,checkthattheinlet/outleton/ovalves,anyby-passandthebleedcockarecloset.
Beforecommissioning,youmustensurethatthecondionsofusecomplywiththecharacteriscsoftheapparatu-
ses.
Thesecharacteriscsarerecalledbythesymbolsonthespecicaonplatesappliedtoeachapparatus(g.15).
Werecommendactuangtheopeningandclosingvalvesveryslowly.
Theregulatorcouldbedamagedbyoperaonswhicharetoofast.
16
Dival SQD-6 - MT 224-E - 02-2020
ENINSTALLATION
Targaidencavadell’apparecchiatura: Fig.11
Thelistofsymbolsusedandtheirmeaningsarelistedbelow:
Pumax= maximumoperangpressureattheinletoftheapparatus.
bpu= rangeofvariabilityoftheinletpressureofthepressureregulatorinnormaloperangcondions.
PS= maximumpressureforwhichthebodyanditsinnermetallicparonwallsaredesignedinaccordancewith
thestrengthrequirementsinthisdocument.
Wds= sengrangeofthepressureregulatorwhichcanbeobtainusingthepartsandthesengspringedat
themomentoftesng(thatiswithoutchanginganycomponentsoftheapparatus.
Wd= sengrangeofthepressureregulatorwhichcanbeobtainusingthepartsandthesengspringedat
themomentoftesng
Cg e KG=experimentalcoecientofcricalow.
AC= regulaonclass
SG= closingpressureclass.
AG= intervenonaccuracy
Wdso= rangeofintervenonfortheoverpressureofslam-shutwhichcanbeobtainusingthesengspringed
atthemomentoftesng.
Wdo= rangeofintervenonfortheoverpressureofslam-shutwhichcanbeobtainusingthesengspringsindi-
catedinthetables.
Wdsu= rangeofintervenonforpressuredecreaseofslam-shutwhichcanbeobtainusingthesengspringed
atthemomentoftesng.
Wdu= rangeofintervenonforpressuredecreaseofslam-shutwhichcanbeobtainusingthesengspringsindi-
catedinthetables.
5.2 GAS INPUT, CONTROL OF EXTERNAL TIGHTNESS AND SETTING
Thepressurizaonoftheequipmentshallbeperformedveryslowly.Shouldnotanystabilizaonprocedurebecarried
out,itisrecommendedtokeepgasspeedinthefeedingpipingatavalueequalto5m/secduringpressurizaon.
Toprotecttheapparatusfromdamage,thefollowingoperaonsmustneverbecarriedout:
• Pressurizaonthroughavalvelocateddownstreamfromtheapparatusitself.
• Depressurizaonthroughavalvelocatedupstreamfromtheapparatusitself.
Externalghtnessisguaranteedifnobubblesformwhenafoammediumisappliedontheelementunderpressure.
Theregulatorandanyotherapparatuses(slam-shut,monitor)arenormallysuppliedalreadysetforthedesiredset-
point.Itispossibleforvariousreasons(e.g.,vibraonduringtransport)forthesengstobechangedwhileremaining
withinthevaluespermiedbythespringsused.
Wethereforerecommendcheckingthesengsusingtheproceduresillustratedbelow.
Ininstallaonconsisngoftwolines,wesuggestcommissioningonelineatame,starngfromtheonewiththe
loverset-point,knownasthe“reserve”line.Theset-pointoftheapparatusesinthelinewillobviouslydeviatefrom
thosespeciedinthetable4.
17 Dival SQD-6 - MT 224-E - 02-2020
EN INSTALLATION
Beforecommissioningtheregulatoryoumustcheckthatalltheon/ovalves(inlet,outlet,anyby-pass)areclosetand
thatthegasisatatemperaturewhichwillnotleadtomalfuncon.
5.3 COMMISSIONING THE REGULATOR
Ifthereisalsoareliefvalveintheline,refertopar.4.1tocheckit
Fig.12
1) parallyopenthedownstreambleedcock6;
2) veryslowlyopentheinleton/ovalveV1;
3) stabilizepressureupstreamanddownstream;throughthepressuregauge5checkthatthedownstreampres-
sureshowsthewishedcalibraonvalue.Otherwise,adjustthecalibraonacngontheproperinternalring
nut(g.1),rotangitclockwisetoincreaseandcounter-clockwisetodecrease;
5) closethebleedcock6andverifytheghtnessoftheregulatorandthevalueofitsclosingoverpressure;
6) checktheghtnessofallthejointsbetweentheon/ovalvesV1andV2usingafoamSoluon;
7) veryslowlyopenthedownstreamon/ovalveV2,unlthelineiscompletelylled.
5.4 COMMISSIONING THE REGULATOR WITH INCORPORED LA/.. SLAM-SHUT
Ifthereisalsoareliefvalveintheline,refertopar.4.1tocheckit.
Fig.13
18
Dival SQD-6 - MT 224-E - 02-2020
ENINSTALLATION
Checkandadjusttheintervenonoftheslam-shut7asfollows:
A)Forslam-shutconnectedtothedownstreampipingbyathree-waysdeviator“push”valve11,(g14)proceed
asfollows:
-  connectacontrolledauxiliarypressuretopathC;
-  stabilisethispressureatthesetpointestablishedfortheregulator;
-  pressknob1ofthethree-way“push”valvecompletely;
-  resettheslam-shutdevicebymeansoftheprovidedthreadedbushing;
-  keeptheknob1pressedand:
• forsafetydeviceswhichinterveneformaximumpressure:slowlyincreasetheauxiliarypressureand
checktheintervenonvalue.Ifnecessary,increasetheintervenonvaluebyturningtheadjustmentring 
18clockwise,oranclockwisetoreducetheintervenonvalue.
• forsafetydeviceswhichinterveneforpressureincreaseandreducon:slowlyincreasetheauxiliary
ressureandrecordtheintervenonvalue.Restorethepressuretothesetpointestablishedfortheregula-
tor,andcarryoutslam-shutresetoperaon.
-  Checkintervenonforpressurereduconbyslowlyreducingtheauxiliarypressure.Ifnecessary,increasethe
ntervenonvaluesforpressureincreaseordecreasebyrespecvelyturningtherings18and17clockwise
andvice-versatoreducethem.
-  checkproperoperaonbyrepeangtheoperaonsatleast2-3mes.
Fig.14
B) Ondeviceswithoutthe“push”valve(g.15)werecommendconnecngthecontrolheadseparatelytoacon-
trolledauxiliarypressureandrepeangtheoperaonsdescribedabove
Fig.15
Restposion
(AandBcommunicaon)
Controllposion
(AandCcommunicaon)
Cham-
berwith
controlled
pressure
Enviromentwiththepressare
tokeepundercontrol
Enviromentwiththepressare
tokeepundercontrol
Chamber
withcontrol-
led pressure
19 Dival SQD-6 - MT 224-E - 02-2020
EN TROUBLE-SHOOTING
Attheendoftheoperaon,reconnectthecontrolheadtothedownstreampressuretake-o
ATTENTION!
N.B.:Theintervenontestsshouldberepeatedatlasteverymonths.
Attheendoftheslam-shutcheck,proceedasfollows:
1) Makesuretheblockisonclosing-posion;
2) OpentheinletblockvalveV1;
3) Openveryslowlytheblockvalve,pullingthecompass;
4) Parallyopentherelieffaucet6placedontheoutletpiping;
5) Check,throughpressuregauge5,thattheoutletpressurehasthegaugingvalueindicatedbytheregulator.
Ifnot,itisthennecessarytoadjustthegaugingvalue,operangontheinternalclamp,rotangitclockwiseto
increaseandan-clockwisetodecrease;
6) Closetherelieffaucet6andcheckthevalueoftheclosurepressure;
7) Usingafoamingagent,checkthecapacityofallthejointsplacedbetweenblockvalvesV1andV2;
8) OpenveryslowlytheoutletblockvalveV2,unlthepipinggetscompletelyfull;
9) Itisadvisabletocheckthat,acvangtheblockvalvemanually,thelinecapacitygetsstopped.
Regulatorset-point
(Pds)mbar ReliefValve Slam-shutMax Slam-shutMin
10<Pds≤15
Pdsx1.7 Pdsx2
Slam-shutnotavailable
15<Pds≤19 10mbar
19<Pds≤24 Pdsx0.56
24<Pds≤35 Pdsx1.55 Pdsx1.77 Pdsx0.57
35<Pds≤40 Pdsx1.7
Pdsx0.6
40<Pds≤70 Pdsx1.4 Pdsx1.52
70<Pds≤80
Pdsx1.3
80<Pds≤100 Pdsx1.4
100<Pds≤300
Sengofon-lineapparatusesconsisngofregulatorsSQD-6+Slam-shut+Reliefvalves Tab.4
6.0 TROUBLE-SHOOTING
Theproblemsofvariouskindswhichcouldariseovermearehighlightedbelow.Theyderivefromphenomenaasso-
ciatedwiththecondionsofthegasaswell,ofcourse,aswiththenaturalageingandwearofthematerials.
Itmustberememberedhatalloperaonsontheapparatusesmustbecarriedoutbyhighlyqualiedpersonnelwith
appropriateknowledgeofthesubject.Tamperingwiththeapparatusesbyunsuitablepersonnelrelievesusfromall
responsibilityofanykind.
Youmustthereforetrainyourmaintenancepersonneloravailyourselfoftheservicecentresociallyauthorisedby
us
20
Dival SQD-6 - MT 224-E - 02-2020
ENTROUBLE-SHOOTING
6.1 SQD-6Pressureregulator(g.40,41,42e43)
PROBLEM POSSIBLE CAUSES REMEDY
NoghtnessatQ=0
Valveseat[2]damaged Replace
Obturator[211]damaged Replace
O-ring[202]damaged Replace
O-ring[213]damaged Replace
O-ring[215]damaged Replace
Diaphragm[209]damaged Replace
Dirtorforeignbodiesinthesealarea Clean
Pumping
Anomalousfriconoftherod-obturator Cleanand,ifnecessary,replace
sealingand/orguideelements
Anpumpingvalvesblockage Cleanandreplaceifnecessary
Reduceddownstreamvolumes Increase volume
IncreasePdwithQ>0 Diaphragm[321]breakage Replace
Diaphragm[209]breakage Replace
Tab.5
6.2 SLAM-SHUTHLA/…(g.40,43)
PROBLEM POSSIBLE CAUSES REMEDY
Slam-shutobturatordoesnot
close Controlheaddiaphragm[21]ruptured Changethediaphragm
Leakagefromslam-shut
obturator
Obturatorgasket[511]deteriorated Changethegasket
O-ring[513]worn Change
Obturatorseat[512]erodedorpied Changetheseat
Incorrectintervenonpressure
Wrongsengofmaxand/orminimum
spring
Makethesengagainusingthe
rings[12]and/or[13]
Friconinleversystems Change
Rearmingnot
possible
Persistenceofthecausewhichledtopres-
sureincreaseordecreasedownstream
Decreaseordecreasethedown-
stream pressure
Leversystemsbrokenorchipped Change
Tab.6
N.B.Iftheslam-shuthasintervened,closetheinletandoutletvalve(V1andV2)inthelineanddischargethepressure
beforecarryingoutanyoperaon.
 Eliminatethecauses whichgaverise tointervenonbeforereacvangit.In theeventof operangproblems
whenpersonnelqualiedforaspecicoperaonarenotavailable,calltheservicecentrenearesttoyou.
 ForfurtherinformaoncontactourSATRIservicecentreatourArcugnano(Vicenza)works
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PIETRO FIORENTINI Dival SQD-6 Owner's manual

Type
Owner's manual

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