【航海技术】_部分5

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1、SearchandRescueOperations199Figure8.5Buoyantsmokesignal.BuoyantSmokeFloatsTheseshallbecontainedinawater-resistantcasinghavingbriefinstructionsordiagramsregardingtheiroperationprintedontheoutsideofthecase.Abuoyantsmokefloatshouldnotigniteinanexplosivemannerbutwhenactivatedinacco

2、rdancewiththemanufacturer’sinstructionsitshouldemitsmokeofahighlyvisiblecolouratauniformrateforaperiodofnotlessthan3minwhenfloatingincalmwater.Itshouldnotemitanyflameduringthetimeofthesmokeemissionneithershouldthesignalbeswampedinaseaway.Itmustbeconstructedinamannersoastoemitth

3、esmokewhensubmergedinwaterforaperiodof10swhenunder100mmofwater.200SeamanshipTechniquesFigure8.6Smokesignal.BREECHESBUOYProvidedthatthedistressedvesseliswithin230mofthecoastlinerescuemaybecarriedoutbymeansofthebreechesbuoy.Thisdistancemaybeincreased,however,byuseofthecoastguards

4、’morepowerfulrocketlineapparatus.ThereareseveralmethodsofcarryingoutarescuebymeansofthebreechesbuoyandthemorepopularmethodsareshowninFigures8.8and8.9.Thehawsermethodisbeingphasedoutbythecoastguardsinfavouroftheheathjackstaymethod.SearchandRescueOperations201Figure8.7Lightandsmo

5、kemarkerfor‘manoverboard’emergency.SecuringWhiptoHawserRoundturnandtwohalfhitchesTravellingblockSeafarersinthepasthaveexperiencedsomedifficultyinunderstandingHawserhowthehawserissecuredtothewhipforthepurposeofhaulingofftoInstructionthestrickenvessel.Therecognisedmethodemployedb

6、ythecoastguardtallyboardisasfollows.BridleAbightisformedinthewhipandwiththisbightaclovehitchisSteadyingformedabout2mfromthebareendofthehawser.lineTheendofthehawseristhenpassedaroundpartofthewhipandTailblocksecuredbyabowlineonitself.ThisvirtuallymakesarunningbowlineEndlesswhipRo

7、undturnandBreechesbuoyaboutthewhip.Thepurposeofthisdoublemethodofsecurement,twohalfhitchesnamelytheclovehitchandthebowline,enablesthebowlinetobecastoffandthehawsertailsecuredbeforetheclovehitchisreleased.Figure8.8Riggingthebreechesbuoy.202SeamanshipTechniquesEndlesswhip,nohawse

8、rTravellingblockridingAtnotimeduringtheoperationistheh