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ID:39773481
大小:1.96 MB
页数:66页
时间:2019-07-11
《Main Engine Alignment on Board》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、MainenginealignmentAlignmentonboardToobtainoptimalparametersforserviceconditions•Enginecrankshaftstraightinservicecondition•Bearingloadofallmainenginebearingsandpropellerlineinserviceconditiontobewithinspecifiedlimits•Acceptablecrankshaftdeflectionsinservicegoingcondition•Thrustshaftloaddiagramtobef
2、ulfilled2730/MRA2004-06-111MainenginealignmentTocompensateasmuchaspossiblechangesbetweenalignmentandservicecondition:a)Hulldeflectionb)Enginetemperaturec)Drydock/afloat2730/MRA2004-06-112MainenginealignmentCold,aligningconditionsServiceconditions2730/MRA2004-06-113MainenginealignmentEnginestructured
3、eflectionduetoheatingup(Enginealignedinstraightondition).2730/MRA2004-06-114MainenginealignmentEnginestructuredeflectionduetoheatingup(EnginealignedwithSAG).2730/MRA2004-06-115MainenginealignmentTraditionalGAP/SAGmainenginealignmentbeforechocking(drydock,notcoupledandmainengineinstraightcondition).N
4、otrecommendedprocedureEnginealignmentwascarriedoutasfollows:•Vesselindrydockorafloathowever•Engineinstraightcondition(crankshaftdeflectionverification)•Enginenotcoupledtotheshaftingsystem•EnginecoldAndthentheenginewaschocking.2730/MRA2004-06-116MainenginealignmentMANB&Wrecommendedmainenginealignment
5、beforechocking(afloatcondition,coupledtoshaftingsystemandmainengineinsaggedcondition).RecommendedprocedureAtpresentMANB&WDieselrecommendedprocedurepriortochockingis:•Vesselinafloatcondition•Engineinsaggedcondition(pianowireverification).•Enginecoupledtotheshaftingsystem.Thatistocontrolthecrankshaftd
6、eflectionofthelastunitandtheengineaftendstaticload.•Enginecold.2730/MRA2004-06-117MainenginealignmentRecommendedfinalalignmentprocedureBeforechocking:Requiredalignmentbeforecouplingofshaftflanges:a)AdjustmentofSAGandGAPatflanges(acc.tocalculationsofshaftlinealignment)b)AdjustmentofbedplateSAG(pianow
7、ireverification)c)Adjusttwistd)Checkcrankshaftdeflectione)CheckjournalbearingtopclearanceRecommendedcheckaftercoupling,beforechockingf)Bearingloadsofatleast:foremoststerntubebearing(ifexists),intermed
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