PIETRO FIORENTINI Dival SQD-6 Owner's manual

Pressure Regulators

Dival SQD-6

INSTALLATION ,COMMISSIONING

AND MAINTENANCE ISTRUCTIONS

TECHNICAL MANUAL

Dival SQD-6 - MT 224-E - 02-2020

ENPoster

Inlet pressure

Outlet pressure

Dival SQD-6

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

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.

513

512

511

503

SQD-6Pressureregulator: Fig.1

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

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.

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!

Dival SQD-6 - MT 224-E - 02-2020

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

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.

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

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

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

PIETRO FIORENTINI Dival SQD-6 Owner's manual

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