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【英文标准名称】:StandardGuideforEscortVesselEvaluationandSelection
【原文标准名称】:护航船评价和选择的标准指南
【标准号】:ASTMF1878-1998(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1998
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:F25.06
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:disabledship;escortplan;escortvessel;navigationallimit;shiptransit;Confinedwaters;Escortvessels;Marinesystems/subsystems/equipment;Waterways
【摘要】:Thisguidepresentssomemethodologiestopredicttheforcesrequiredtobringadisabledshipundercontrolwithintheavailablelimitsofthewaterway,takingintoaccountlocalinfluencesofwindandseaconditions.Presentedaremethodologiestodeterminethecontrolforcesthatanescortvesselcanreasonablybeexpectedtoimposeonadisabledship,takingintoaccountthedesignoftheship,transitspeed,winds,currents,andseaconditions.Insomeinstances,thisguidepresentsformulaethatcanbeuseddirectly;inotherinstances,inwhichtheinteractionofvariousfactorsismorecomplicated,itpresentsanalyticprocessesthatcanbeusedindevelopingcomputersimulations.Unlikethemoretraditionalworkofberthingassistanceinshelteredharborsorpullingax201C;deadshipx201D;ontheendofalongtowline,theescortingmissionassumesthatthedisabledshipwillbeattransitspeedatthetimeoffailure,andthatitcouldbeinexposedwaterssubjecttowind,current,andseaconditions.Thenavigationalconstraintsofthechannelorwaterwaymightrestricttheavailablemaneuveringareawithinwhichthedisabledshipmustbebroughtundercontrolbeforeitrunsagroundorcollideswithfixedobjectsinthewaterway(seeallision).Theescortmissionrequiresescortvessel(s)thatarecapableofrespondingintimelyfashionandthatcansafelyapplysubstantialcontrolforcestothedisabledship.Thisentailsevaluationoftheescortvessel''shorsepower,steeringandretardingforcesatvariousspeeds,maneuverability,stability,andoutfitting(towinggear,fendering,andsoforth).Thisguidecanbeusedindevelopingescortplansforselectingsuitableescortvessel(s)forspecificshipsinspecificwaterways.Themethodologiesandprocessesoutlinedinthisguideareforperformance-basedanalysesofescortscenarios.Thismeansthattheacceptabilityofavessel(orcombinationofvessels)forescortingisbasedupontheabilitytocontrolthedisabledshipinaccordancewithspecifiedperformancecriteria.Thisguideaddressesfourselectedperformancemeasures:Towing8212;theabilitytotowthedisabledshipunderspecifiedparameters,Stopping8212;theabilitytostopthedisabledshipwithinspecifiedparameters,Turning8212;theabilitytoturnthedisabledshipwithinspecifiedparameters,andHoldingsteady8212;theabilitytoholdthedisabledshiponasteadycourseunderspecifiedparameters.Thex201C;specifiedparametersx201D;areadditionaldetailsthatmustbefactoredintotheperformanceanalysis.Theseparametersmightbespecifiedbyaregulatoryagencyimposingtheescortrequirement,byastudygroupevaluatingthefeasibilityofescortinginaparticularwaterway,orbytheshiporescortvesseloperatorsthemselvestodefinetheperformanceenvelopeoftheirvessels.Someexamplesoftheseparametersare:Ashiptransitspeed(atthemomentoffailure);Thefailurescenario(rudderfailurealone,orsimultaneousrudder/propulsionfailure,degreeoffailure,andsoforth);Navigationalconstraintwithinwhichthedisabledshipmustbebroughtundercontrol(suchasallowableadvanceandtransfer,cross-trackerror,andsoforth);Wind,current,andseaconditions;andTimedelays,failurerecognition,decisionmaking,escortvesselnotification,escortvesselpositioning,achievingfullpower,andsoforth.Theanticipatedusersofthisguideare:Shipowners/o......