项目投资建议书(恢复万吨硝酸钾技术改造项目)[]

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1、APRACTICALGUIDETODRAFTSURVEYSTRIMMINGCALCULATIONSETC.GLENNJSALDANHA(salmonmrn@gmail.com)PLEASEPRINTTHISOUTUSINGBOTHSIDESOFTHEPAPER-HAVEADJUSTEDTHEFILETOALLOWEASIERREADINGWHENPRINTED&FILEDTHISWAY64INDEXCHAPTERTOPICPAGESITHE6-SIDEDDRAFT3-10IITHEDRAFTSURVEY11-21

2、IIITRIMMING22-51IVHOG/SAG52-56VCONTROLLINGDRAFTS57-59VIMAXIMUMDRAFTS61-6364CHAPTERI-THE6-SIDEDDRAFT64IntheabovediagramL.B.P.=LengthbetweenPerpendicularsL.B.M.=LengthBetweenMarksC=LCF=LongitudinalCenterofFloatation-distancefmmidshipsc=differencebetweendraftatL

3、CF&draftatmidshipsdF=FordDraftmarkdA=AftDraftMarkFP=ForwardPerpendicularAP=AftPerpendicularWL=waterlinewhenevenkeelW1L1=waterlinewhentrimmed(inthiscasebystern)T=TRIM(attheperpendiculars)Ta=APPARENTTRIM(atthemarks)A=Distancebetweentheforddraftmark&fordperpendi

4、culara=Differencebetweendraftatfordmark&draftatfordperpendicularB=Distancebetweentheaftdraftmark&aftperpendicularb=Differencebetweendraftataftmark&draftataftperpendicular^M=AngleofTrimAsallaresimilartriangleswiththesame^M:T=Ta=c=a=b=Tan^MLBPLBMLCFABSinceTa=at

5、hena=AxTaLBMALBM&Ta=bthenb=BxTaLBMBLBMIntheformulaforcorrectiontobeappliedtotheforddraftAisaconstantvalueonEACHSHIPasisLBMasisB64OnaCape-sizevesselA=1.00metresandLBM=248.50metersSinceCorrectiontobeappliedtothefordreaddraft(marks)=a=AxTaLBMThereforea=1xTa248.5

6、anda=0.0040241xApparenttrimandsinceB=10.5metersThereforeb=10.5xTa248.5andb=0.0422535xApparentTrimWhentheDraftMarksareonthePerpendicularsthennocorrectionistobeappliedIftheforddraftmarkisaftofthefordperpendicularandtheaftdraftmarkisfordoftheaftperpendicularasin

7、thediagramandonmostbutnotallvesselsthen,“a”willbesubtractedfromthereadforddrafttogetthedraftfordand“b”willbeaddedtothereadaftdrafttogettheaftdraftWHENTHEVESSELISTRIMMEDBYTHESTERNWHENVESSELISTRIMMEDBYTHEHEADthecorrectionsignwillbeopposite.Afterreadingthedrafts

8、andapplyingthedraftcorrectionthenonewillproceedtocalculatetheMeanQuarterMeanDraftusingthe6sidedformula.Manysurveyorsdonotworryaboutthecorrectiontothereaddraftswhenthetrimisverysmall.Actua