新版轮机英语unit14boilermounting

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1、Lesson14Boilermountings,managementandmaintenanceBoilermountings(附件)Certainfittings(附件)arenecessaryonaboilertoensureitssafeoperation.Theyareusuallyreferredtoasboilermountings(锅炉附件）.Themountingsusuallyfoundonaboilerare:SafetyvalvesThesearemountedinpairs（induplex)toprotec

2、ttheboileragainst(from)overpressure（超压）.Oncethevalveliftingpressure(启阀压力）issetinthepresenceofaSurveyor(验船师)itislockedandcannotbechanged.Thevalveisarrangedtoopenautomaticallyatthepre-setblowoffpressure(启阀压力）.MainsteamstopvalveThisvalveisfittedinthemainsteamsupplylineand

3、isusuallyofthenon-returntype（止回型）.AuxiliarysteamstopvalveThisisasmallervalvefittedintheauxiliarysteamsupplyline,andisusuallyofthenon-returntype.Feedcheckorcontrolvalve(给水单向阀或控制阀)Apairofvalvesarefitted:oneisthemainvalve,theothertheauxiliaryorstandby.Theyarenon-returnval

4、vesandmustgiveanindication（指示）oftheiropenandclosedposition.WaterlevelgaugeWaterlevelgaugesor‘gaugeglasses’arefittedinpairs,atoppositeendsoftheboiler,theconstructionofthelevelgaugedependsontheboilerpressure.Airreleasecock（放气阀）Thesearefittedintheheaders（联箱）,boilerdrum（锅筒

5、）,etc.,toreleaseairwhenfillingtheboilerorinitiallyraisingsteam（升汽）.SamplingconnectionAwateroutletcockandcoolingarrangementisprovidedforthesamplingandanalysisoffeedwater.Aprovision（装置）mayalsobemadeforinjectingwatertreatmentchemicals.Blowdownvalve(下排污阀)Thisvalveenableswa

6、tertobeblowdownoremptied（放空）fromtheboiler.Itmaybeusedwhenpartially（部分）orcompletelyemptyingtheboiler.Scumvalve(上排污阀)Ashallowdish（浅盘）positionedatthenormalwaterlevelisconnectedtothescumvalve.Thisenablestheblowingdownorremovalofscum（浮渣）andimpurities（杂质）fromthewatersurface.

7、Whistle（汽笛）stopvalveThisisasmallborenon-returnvalvewhichsuppliesthewhistlewithsteamstraightfromtheboilerdrum（锅筒）.Watertubeboiler,becauseoftheirsmallwatercontentinrelationtotheirsteamraisingcapacity,requirecertainadditionalmountings:Automaticfeedwaterregulator（自动给水调节器）F

8、ittedinthefeedlinepriortothemaincheckvalve（主给水阀）,thisdeviceisessentialtoensurethecorrectwaterlevelintheboilerduringal