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Safety accessories



Introduction

Duetotheusecharacteristicsofpressurevesselsandthechemicalprocesscharacteristicsoftheinternalmedium,itisoftennecessarytosetupsomesafetydevicesandmeasuringandcontrolinstrumentsonthevesseltomonitortheparametersoftheworkingmedium.Inordertoensurethesafetyoftheuseofpressurevesselsandthenormalprogressoftheprocess.

Safetyaccessoryisasafetydeviceinstalledonequipmentforthesafeoperationofpressurevessels.Includingsafetyvalves,burstingdiscdevices,emergencyshut-offdevices,pressuregauges,liquidlevelgauges,temperaturemeasuringinstruments,fusibleplugs,etc.

Classification

1.Thesafetyaccessoriesofpressurevesselsareclassifiedaccordingtotheirperformanceorpurpose.Theycanincludethefollowingfourtypes:

1.Pressurereliefdevice:Adevicethatcanautomaticallydischargethepressurewhenthepressurevesselisoverpressure.Suchas:safetyvalves,rupturediscsandfusibleplugs,etc.

2.Meteringdevice:referstoanappliancethatcanautomaticallydisplayprocessparametersrelatedtosafetyduringcontaineroperation.Suchas:pressuregauge,thermometer,liquidlevelgauge,etc.

3.Alarmdevice:Referstotheinstrumentthatcanautomaticallyemitsoundorotherobviousalarmsignalswhenthecontainerisinadangerousstateduetounsafefactorsintheoperation.Suchas:pressurealarm,temperaturedetector.

4.Interlockingdevice:Itisacontrolmechanismsetuptopreventoperationerrors.Suchas:interlockswitch,linkagevalve,etc.

Second,amongthesafetyaccessoriesofpressurevessels,themostcommonlyusedandmostcriticalaresafetyreliefdevices,pressuregauges,etc.

1.Safetyvalve:Itscharacteristicisthatwhenthepressurevesselisundernormalworkingpressure,itiskepttightandleak-proof.Oncethepressureinthevesselexceedstheregulation,itcanautomaticallyandquicklydrainthemediuminthevesseltomakethevesselThepressureisalwayskeptwithinthehighestallowablerange.Safetyvalvescanbedividedintospring-typesafetyvalves,lever-typesafetyvalves,andpulse-typesafetyvalves.Undernormalcircumstances,thesafetyvalveshouldbeinstalledonthecontainerbodyasmuchaspossible,theliquefiedgasshouldbeinstalledinthegasphase,andthesafetyofdischargeshouldbeconsidered.

2.Burstingdisc:alsoknownasexplosion-proofmembrane,itisafracturedsafetydevicewithgoodsealingperformanceandquickresponsetopressurerelief.Generallyusedinhigh-pressure,non-toxicgascylinders,suchasair,nitrogen.Theburstingdiscpressureonthegascylinderisgenerallylargerthanthefillingpressureofthegascylinderandlessthanthedesignmaximumtemperaturerisepressureofthegascylinder.

3.Fusibleplug:itusesthelowmeltingpointalloyinthedevicetomeltatahighertemperatureandopensthechanneltodischargethegasfromtheholeoftheoriginallyfilledfusiblealloytoreleasethepressureItischaracterizedbysimplestructure,easyreplacement,andeasycontroloftheactionpressuredeterminedbythemeltingtemperature.Itisgenerallyusedforcontainerswherethegaspressureisnothighandiscompletelydeterminedbythetemperature.Forexample,themeltingtemperatureofthefusibleplugonthelow-pressureliquefiedgaschlorinecylinderis65°C.

Comparedwiththesethreesafetydevices,thesafetyvalvecanbeclosedafteritisopenedtodischargeexcessivepressure.Thecontaineranddevicecancontinuetobeused,buttherupturediscandfusibleplugcannotbeusedafterthedischargeofexcessivepressure.Andthedevicehastostoprunning.Whenselectingsafetyvalvesandfusibleplugs,thesafetydischargevolumeshouldbeconsidered,andtherupturediscshouldconsiderthecalculationofthedischargeareaandthickness.

4.Pressuregauge:Itisaninstrumentusedtomeasurethepressureofthemediumonapressurevessel.Typescanbedividedinto:

Springpressuregauge,suitableforpressurevesselswithgeneralmedia.

Diaphragmpressuregauge,suitableforpressurevesselswithcorrosivemedia.

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