Onderwerp: Bezoek-historie

1108 - Guidelines For Assessing The Longitudinal Strength Of Bulk Carriers During Loading, Unloading And Ballast Water Exchange
Geldigheid:25-05-2004 t/m Status: Geldig vandaag

Dit onderwerp bevat de volgende rubrieken.

 

 

Ref. T4/3.01                                                                                                               MSC/Circ.1108

25 May 2004

 

1          TheMaritimeSafetyCommittee,atitsseventy-sixthsession(2to13December2002), havingconsideredtheresultsofvariousFSAstudiesonbulkcarriersafety,agreedthattherisk controloptioncallingfortheprovisionofdetailed,comprehensiveanduser-friendlyinformation coveringstabilityandstrengthcharacteristicsoftheship'shullduringloadingandunloadingshould beappliedtonewbulkcarriers.  Furthermore,MSC76notedthattheabove-mentionedriskcontrol optionwasmorerelevantforsmallershipswithrespecttostabilityandforlargershipswithrespect tostructuralstrength,andinstructedtheSub-CommitteeonStabilityandLoadLinesandonFishing VesselsSafety(SLF)andtheSub-CommitteeonShipDesignandEquipment(DE)todevelop relevant guidelines.

 

2          TheDESub-Committee,atitsforty-seventhsession(25Februaryto5March2004),noting thattheSLFSub-Committee,atitsforty-sixthsession(8to12September2003),hadprepareddraft SOLASamendmentstoaddressthestabilityissuesonbulkcarriersoflessthan150 minlength, agreedthatforbulkcarriersof150minlengthandabove,user-friendlyguidelinesforassessingthe longitudinal strength would be more appropriate.

 

3          The  Maritime  Safety  Committee,  at  its  seventy-eighth  session  (12  to  21  May  2004), followingtherecommendationofDE47,approvedtheGuidelinesforassessingthelongitudinal strengthofbulkcarriersduringloading,unloadingandballastwaterexchange,setoutintheannex.

 

4          MemberGovernmentsareinvitedtobringtheannexedGuidelinestotheattentionofloading instrument  manufacturers,  related  computer  software  developers,  mariners,  dry  cargo  terminal operators and other parties involved in loading, unloading and ballast water exchange operations.

 

 

 

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Annex

1 Preamble

The aim of these Guidelines is to ensure the provision of detailed, comprehensive and user-friendly information covering the longitudinal strength characteristics of the ships hull during loading, unloading and ballast water exchange.

2 Definitions

2.1       Loading manual

 

The loading manual is a document which describes:

 

.1         theloadingconditionsonwhichthedesignoftheshiphasbeenbased,including permissible limits ofstill water bending moments and shear forces;

 

.2         theresultsofthecalculationsofstillwaterbendingmoments,shearforcesand,where applicable, limitations due to torsional loads;

 

.3         enveloperesultsandpermissiblelimitsofstillwaterbendingmomentsandshear forces in the hold flooded condition as applicable;

 

.4         thecargohold(s)orcombinationofcargoholdsthatmightbeemptyatfulldraught.

Ifnocargoholdisallowedtobeemptyatfulldraught,thisshouldbeclearlystatedin the loading manual; and

 

.5         theallowablelocalloadsforthestructure(e.g.hatchcovers,decks,doublebottom, tank top).

 

2.2       Loading instrument

 

2.2.1    Aloadinginstrumentisaninstrument,eitheranalogueordigital,bymeansofwhichitcanbe easilyandquicklyascertainedthat,atspecifiedread-outpoints,thestillwaterbendingmoments, shearforces,loadsonthedoublebottomandthestillwatertorsionalmoments,whereapplicable,in anyloadingorballastconditionwillnotexceedthespecifiedpermissiblevaluesduringplanned loading, unloading and ballast water exchange.

 

2.2.2    In this context the loading instrument comprises the hardware and software.

3 Information To Be Provided

3.1       Loading manual

 

3.1.1    Fortheloading,unloadingandstowageofsolidbulkcargoes,referenceshouldbe madeto SOLASregulationVI/7andtherelatedCodeofPracticefortheSafeLoadingandUnloadingofBulk Carriers (BLU Code).

 

3.1.2    Theloadingmanualshouldcontaintypicalloadingsequencesfromcommencementofcargo loading  to  reaching  full  deadweight  capacity  for  homogeneous  conditions,  relevant  part  load conditionsandalternateholdloadingconditionswhereapplicable.Typicalunloadingsequencesfor these conditions should be included.

 

3.1.3    Thetypicalloadingsequencesshouldbedevelopedpayingdueattentiontotheloadingrate, the deballasting capacity and the applicable strength and draught limitations.

 

3.1.4    The typical loading and unloading sequences should include, as relevant:

 

.1         alternate light and heavy cargo loading condition;

 

.2         homogeneous light and heavy cargo loading condition;

 

.3         shortvoyageconditionwheretheshipisloadedtomaximumdraughtwithlimited bunkers;

 

.4         multiple port loading/unloading condition;

 

.5         deck cargo condition, where permitted;

 

.6         block loading; and

 

.7         ballast water exchange conditions, if not covered by other documents.

 

3.2       Loading instrument

 

3.2.1    Theinput/outputformatoftheloadinginstrumentshould,asfaraspracticable,beeasily comparableininformationandformattotheloadingmanualsothattheoperatorswilleasilygain familiarity with the loading calculations.

 

3.2.2    Theloadinginstrumentshouldreadilyprovideanyinformationthatmaybeobtainedfromthe loadingmanualbyincrementedcalculation,reflectingtheoperationscenarioinaclearlypresented format.

 

3.2.3    Asimpleandstraightforwardusermanualwritteninthesamelanguageastheloadingmanual shouldbeprovided.  Theusermanualshouldcontaintheapprovedtestconditionsandbewrittenina language  with  which  the  ship's officers  responsible  for  cargo  operations  are  familiar.   If  this languageisnotEnglish,theshipshouldbeprovidedwithamanualwrittenalsointheEnglish language.

 

 

 

 

 

 

 

3.2.4    Foreachoccasionwhentheshipisloadedorunloadedorballastwaterisexchangedatsea, the sequence of the operations should be checked, using the approved loading instrument.

 

3.2.5    Whereapplicable,theloadinginstrumentshouldalsobecapableofperformingcalculations for break bulk cargo and loading of different grades of cargo in the same cargo hold.

 

3.2.6    Thesequenceshouldbebuiltupstepbystepfromcommencementofcargoloadingto reachingfulldeadweightcapacity.  Astepoccurseachtimetheloadingequipmentchangesposition

toanewhold.   Eachstepshouldbedocumented.   Inadditiontolongitudinalstrength,thelocal strength of each hold should be considered.

 

3.2.7    Foreachloadingconditionasummaryofallstepsshouldbeincluded.Thissummaryshould highlight the essential information for each step such as:

 

.1         how much cargo is loaded into each hold during the different steps;

 

.2         howmuchballastwaterisdischargedfromeachballasttankduringthedifferent steps;

 

.3         themaximumstillwaterbendingmomentsandshearforcesattheendofeachstep; and

 

.4         the ship's trimand draught at the end of each step.

 

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