Introductiontoterms
TheAmericanIndustrialEngineeringStandardsVocabularyhasthefollowingdefinitions:"Processflowdiagramsareintheformofdiagramsandsymbolstoexpresstheworkdonebytheproductthroughsomeorallstagesoftheprocess."
Theinformationincludedinatypicalflowchartincludesquantity,movingdistance,typeofworkdone,andequipmentused.Itcanalsoincludeworkinghours."Inordertofacilitatethelistingoftheprocessflowchart,generallyuseTheinternationallyusedrecordinggraphicsymbolsrepresentvariousactivitiesandactionsintheactualproduction,andgraphicalsymbolsareusedtoindicatethemechanicalequipmentusedintheprocessandtheinterconnectedsystemdiagrams.
WiththecontinuousdevelopmentofcomputertechnologyWiththedevelopment,computer-aideddesignhasbeenwidelyusedinthechemicaldesignprocess.Inthechemicaldesignprocess,chemicalprocessflowchartdrawingisanimportantlink.
BecauseofthelargeworkloadofmanualdrawingofchemicalprocessflowchartAndtheefficiencyislow.AutoCADisusedtodrawthechemicalprocessflowchart.Eachequipmentandpipefittingsarecomposedoflines.Itiscumbersometoaccuratelylocateanddrawthegraphics.
Therefore,accordingtotheHG20519.*-92standardoftheMinistryofChemicalIndustryBasedontheAutoCADsecondarydevelopmentlanguage,themainstreamtechnologyanddevelopmentenvironmentaredevelopedwithCAD,andthechemicalprocessflowchartCADdrawingsoftwareisdevelopedundertheAutoCADenvironment.
Thesoftwarehasstandardmapframesandsoftwarethatcanbeselectedbyusers.Theframecanbeautomaticallylengthenedandmovedtotheleftaccordingtotheuser'sdrawingsituation.Thedrawingofchemicalequipment,pipelines,pipefittings,etc.adoptstheiconmenutodisplayintuitively,thesizeoftheequipmentisdisplayedbytheframeoftheequipment,userpositioning,softwareautomaticdrawing,pipelineautomaticorthogonality,andpipefittingautomaticpositioningdrawingIt’sveryconvenient.
Thesoftwareusesacombinationofpull-downmenus,toolbuttonsandiconmenucommandsfordrawing.Theoperationissimpleandintuitive.Itcanbeusedtodrawprocessflowchartsinthechemical,petroleum,environmentalprotectionandotherrelatedfields.Largerapplicationvalue.
Classification
Theprocessflowdiagramsaregenerallyasfollows:
1.Theoverallprocessflowdiagramormaterialbalancediagramofthewholeplant,Inthechemicalplantdesign,thewholeplantflowchartisprovidedforthegeneraldescription.Foracomprehensivechemicalplant,itiscalledaplant-widematerialbalancediagram.Eachworkshop(worksection)onthediagramisillustratedbyathinsolidlinedrawnwithalongrectangle.Theprocessisshown.Thelineonlydrawsthemainmaterialsandisrepresentedbyathicksolidline.Theprocessdirectionisdrawnontheprocesslinewitharrows.Thefigurealsoindicatesthenameoftheworkshop,thenamesoftherawmaterials,semi-finishedproductsandfinishedproducts,balancedata,sources,anddestinationsofeachworkshop.
2.MaterialflowdiagramMBD(materialbalancediagram)isbasedontheoverallprocessflowdiagramofthewholeplant,whichexpressesthedrawingsoftheinternalprocessmaterialflowineachworkshop.MarkthegroupofeachmaterialontheprocessDistribution,flowandequipmentcharacteristicdata,etc..
3.ProcesspipelineandinstrumentflowchartPID(Piping&InstrumentDiagram)isaprocessflowdiagramwithmoredetailedcontentbasedonthematerialflowdiagram.Drawtherelevantsymbolsofcertainvalves,pipefittings,automaticcontrolinstruments,etc.configuredonthepipelinesandequipment.
Drawingsoftware
ThegeneraldrawingsoftwareoftheprocessflowchartisAutoCAD,butenterprisesanddesigninstitutesgenerallyusesoftwaredevelopedontheAutoCADplatform,suchas:domesticsoftware-PIDCADprocessFlowchartdesignsoftware,processdesignsoftware.
Thelatteristobuildadatabaseofcommonlyusedchemicalequipmentintheformofcomponents,whichcanbedirectlycalledbytheuser.
View
Drawastandardprocessflowdiagram(includingchemicalpartsdrawingandchemicalequipmentdrawing)),thefirststepistoselecttheview,thepurposeoftheviewistoreflecttheactualThestructure,size,andinstallationdimensionsoftheobjectcanclearlyunderstandtheapproximatestructureoftheactualobject.Mostchemicalmachineryandequipmenthavethefeatureofrevolvingbody,sowhenselectingthemainview,theplanewherethemainaxisoftherevolvingbodyislocatedisdefaultedtothemainview.
Afterselectingthemainview,thesecondstepistoselectabasicview,whichismainlyusedasanauxiliary.Atthesametime,therearetwodefaultregulations:
①Whentheequipmentisaverticalequipment,selectthetopviewasthebasicviewoftheequipment;
②Whentheequipmentisahorizontalequipment,Theleftviewisusuallyusedasthebasicviewofthissetofequipment,andadjustmentscanalsobemadewhenspecialcircumstancesarise.
Afterdeterminingthemainviewoftheequipmentandabasicview,accordingtothecomplexityoftheequipmentandtheactualdrawingneeds,thedrawingofpartsandover-complexpartsismainlycompletedthroughauxiliaryviews.
Drawingprogram
Theprocessflowchartdrawingprogramis:
Firstselectthedrawingsub,titlebar,etc.;secondly,drawthemainequipment;again,drawthepipeline;Then,addvalves,instruments,pipefittings,etc.,andaddannotationinformation;finally,checkthecorrectnessofthedrawing;