Onderwerp: Bezoek-historie

1159 - Guidelines On The Provision Of Stability-Related Information For Bulk Carriers
Geldigheid:24-05-2005 t/m Status: Geldig vandaag

Dit onderwerp bevat de volgende rubrieken.


Ref. T1/3.02                                                                                                               MSC/Circ.1159

24 May 2005


1          The    Maritime      Safety     Committee     (MSC),    at    its    seventy-sixth      session     (2 to 13 December 2002),havingconsideredtheresultsofvariousFSAstudiesonbulkcarriersafety, agreed  that  the  risk  control  option  calling  for  the  provision  of  detailed,  comprehensive  and user-friendlyinformationcoveringstabilityandstrengthcharacteristicsoftheship'shullduring loadingandunloadingshouldbeappliedtonewbulkcarriers.  Furthermore,MSC76notedthatthe above-mentionedriskcontroloptionwasmorerelevantforsmallershipswithrespecttostabilityand forlargershipswithrespecttostructuralstrength,andinstructedtheSub-CommitteeonStabilityand Load  Lines  and  on  Fishing  Vessels  Safety  (SLF)  and  the  Sub-Committee  on  Ship  Design  and Equipment (DE) to develop relevant guidelines.


2          Subsequently,theSLFSub-Committee,atitsforty-sixthsession(8 to12 September 2003), prepareddraftSOLASamendmentstoaddressthestabilityissuesonbulkcarriersoflessthan150m inlength,andatitsforty-seventhsession(13to17September2004),preparedtheGuidelinesonthe provision ofstability-related information for bulk carriers, for all new bulk carriers.


3          TheMaritimeSafetyCommittee,atitseightiethsession(11to20May2005),followingthe recommendation  of  SLF  47,  approved  the  Guidelines  on  the  provision  of  stability-related information for bulk carriers, as set out in the annex.


4          MemberGovernmentsareinvitedtobringtheannexedGuidelinestotheattentionofstability instrument  manufacturers,  related  computer  software  developers,  mariners,  dry  cargo  terminal operators and other parties involved in cargo operations.








1 Purpose


Theaimofthisdocumentistoprovidedetailed,comprehensiveanduser-friendlyguidanceon provisionofstability-relatedinformationandstability computing software supporting for the safe operationofbulkcarriersand,inparticular,thosebulkcarrierstowhichSOLASregulationXII/11.3 applies.

2 Definitions

2.1 Stability Data

Stability data is a set of data resulting from ship design process. It covers stability characteristics pertaining to a specific ship. Stability data is the base for ship stability calculation in operation, especially stability assessment, by means of hand made calculations or by stability instrument.

2.2 Stability Instrument

2.2.1    Astabilityinstrumentisaninstrument,eitheranalogueordigital,providedforships,by means ofwhich all relevant stability information is provided and all calculations or checks can be easily  and  quickly  performed,  as  necessary,  to  ensure  compliance  with  the  applicable  stability requirements.


2.2.2    In this context, the stability instrument comprises the hardware and software.

3 Information To Be Provided

3.1 Stability Data And Other Information

Stability data should include the data and information outlined here under.


3.1.1    General information:


.1         ship's name;


.2         type of ship (i.e. bulk carrier);


.3         name of builders and new building number;


.4         date of build (keel laying) or conversion;


.5         class notation;


.6         nationality, port of registry and IMO number;


.7         principal dimensions (length, breadth and depth);



.8         type of load line assigned (type A, B, B-60, etc);


.9         maximum  mean  permissible  draught  corresponding  to  the  summer  freeboard assigned;


.10       maximummeanpermissibledraughtcorrespondingtothesummertimberfreeboard

(if appropriate);


.11       displacement  in  salt  water  (at  stateddensity)  corresponding  to  .9  and  .10  at  the designed (level) trim;


.12       maximum  permissible  draught  at  the  forward  perpendicular  for  bow  height considerations;


.13       theminimumrecommendeddraughtattheforwardperpendicularforanysailing condition;


.14       stability  limitations  of  the  ship's  design,  both  for  loading  operation  and,  where applicable, associated with undertaking ballast water exchange at sea; and


.15       lightship particulars obtained frominclination test or lightship survey.


3.1.2    Ascaledarrangementdrawingshowingclearlytheuseanddistributionofthevariouscargo compartments,  tanks,  stores  as  well  as  machinery  and  accommodation  spaces.    Names  of compartments used in the text of the document should be clearly indicated.


3.1.3    Atableofcapacitieswithcentresofvolume(longitudinal,verticalandtransverse)forevery compartmentavailableforthecarriageofcargo,fuel,stores,feedwater,domesticwaterandwater ballast.  Whereapplicable,suchasforcargoholds,tablesorcurvesgivingcapacityandcentreof volumeasfunctionsofcompartmentdepthorullageshouldbeincluded.  Whenullageisused,the ullagereferencepointshouldbeclearlystated.  Thereferenceplanesandthepositivedirectioninall sixdegreesoffreedomforcentresofvolumeshouldbethesameasthoseusedforanycomputeror other information provided as an aid to the safe loading of the ship.


3.1.4    Freesurfaceeffecttablesand/orcurvesforeverytankandcargoholdthatmaycontainliquid, asafunctionofvolumeshowingtheeffectonthestabilityoftheshipofliquidsinpartiallyfilled tanks.   Thesetables/curvesshouldgivethefreesurfacemomentsnecessarytocorrecttheinitial metacentricheightandthosetocorrecttherightinglevervalueswhentheshipisinclined.  Inthe caseoftankscontainingliquidswhichmaybeconsumed,dischargedortransferredtoandfromother compartments  while  the  ship  is  at  sea,  including  anti-rolling  tanks  and/or  heeling  tanks,  the maximumfreesurfacemomentswhichmaybedevelopedshouldbegiven.  Whenholdsordeep tankscontainingliquidsaremaintainedpartiallyfilledwhiletheshipisatsea,thefreesurface moments used may be based on the actual quantity of fluid contained.


3.1.5    Hydrostaticparticularsfortheshipatdesignedtrim,incurveortabulatedform,toabaseof meandraughtmeasuredtothebottomofthekeeloverarangecoveringthelightshipandmaximum draughts.  Whentabulated,theseshouldcorrespondtoevenly-roundedunitsofdraughtatintervals appropriate to the size of ship.  The particulars should include:


.1         extreme displacement in salt water at stated density;

.2         immersion (displacement per unit interval of draught);


.3         moment to change trimone unit;


.4         transverse metacentre height above baseline;


.5         transverse centre of buoyancy;


.6         vertical centre of buoyancy;


.7         longitudinal centre of floatation; and


.8         longitudinal centre of buoyancy.


Positionofreferenceplanesshouldbestatedinthecaseofitemsspecifiedinparagraphs and should be the same as the corresponding reference planes for centres of gravity.


3.1.6    Details  of  load  line,  draught  marks  and  deadweight  particulars.   A  diagram  should  be provided showing the load line marks including:


.1         position of the deck line relative to the upper extreme of the ship's depth;


.2         draught to the summer load waterline;


.3         draught to the summer timber load waterline (if appropriate);


.4         corresponding freeboards,


this or other diagramor tabular presentation should also give the relationships between:


.5         mean draught;


.6         extreme displacement;


.7         immersion (displacement per unit interval of draught); and


.8         deadweight.


Thepositionsofthedraughtmarksshouldbedefinedinrelationtoboththeship'sperpendiculars and the longitudinal reference plane mentioned above.


3.1.7    Formstabilityparticulars(Crosscurvesofstability).Dataintheformofcurvesortables showingtherelationshipbetweenformrightinglever,angleofheelanddisplacementatthedesigned trim  over  the  full  operational  range  of  displacement.   Where  the  operating  trim  or  form  and arrangementoftheshiparesuchthatachangeintrimhasanappreciableeffectonrightingarms, additionalformstabilitydatashouldbeincludedforasuitablerangeoftrim.  Theformstability informationshouldbepresentedinaformthatenablesrightingarmstobereadilydeterminedtothe nearest centimetre.


3.1.8    Set of stability criteria required by the Administration.


3.1.9    Limiting  envelope  curves  resulting  from  intact  stability  and  damage  stability,  when appropriate.  ThesecurvesshouldbeclearlystatedasbeingGMrequiredcurvesorKG maximum curves.


3.1.10  Auxiliarydatawhicharenecessarytoprovecompliancewiththerelevantstabilitycriteria and, when appropriate, icing data.


3.1.11  Master's  instructions  should  precisely  and  unambiguously  detail  how  the  information providedinthestabilitydataandelsewhereistobeusedtoobtainthedraught,trimandstability characteristicsofanewloadingconditionanddeterminewhetherthatconditionfulfilstherelevant stability criteria.


3.1.12  Loading conditions  The loading conditions covered by the stability data should include:


.1         lightship;


.2         docking;


.3         fullyloadeddeparture,withcargohomogeneously distributed throughout all cargo spaces and with full stores and fuel;


.4         fully  loaded  arrival,  with  cargo  homogeneously  distributed  throughout  all  cargo spaces and with 10% stores and fuel remaining;


.5         ballast departure, without cargo but with full stores and fuel;


.6         ballast arrival, without cargo but with 10% stores and fuel remaining;


.7         otherdepartureandarrivalconditionstypicaloftheship'sintendedservice,suchas alternate hold loading, ore loading, deep ballast, etc. as applicable; and


.8         where appropriate, other conditions used for ballast water exchange.  For each loading condition, the following should be shown:


.1         asketchoftheshipindicating,pictorially,themainitemsofdeadweightincludedin the displacement;


.2         atableshowingthelightshipparticulars,thedistributionofallcomponentsofthe deadweight,thepositionsoftheircentresrelativetothedefinedreferenceplanes, correspondingstaticmomentsandasummationgivingtheresultwhichshouldshow the full displacement mass and the position of its centre;


.3         atablelistingthefreesurfaceeffectsofliquidsinallcompartmentswhichmaybe partially filled;

.4         a  diagramshowing  the  curve  of  righting  levers  (GZ),  corrected  for  free  surface effects,plottedagainstangleofinclination.Thescalesusedshouldbethesamefor each loading condition; and


.5         a summary of the condition giving:


.5.1      displacement and related sea water density;


.5.2      corresponding draught at longitudinal centre of floatation;


.5.3      corresponding draught at freeboard mark;


.5.4      moment to change trimone unit;


.5.5      longitudinal and transverse positions of centre of buoyancy;


.5.6      longitudinal and transverse positions of centre of gravity;


.5.7      trimming lever;


.5.8      total trimover perpendiculars;


.5.9      longitudinal position of centre of floatation;


.5.10    trimat forward perpendicular;


.5.11    trimat aft perpendicular;


.5.12    draught at forward perpendicular;


.5.13    draught at aft perpendicular;


.5.14    draught at forward draught mark;


.5.15    draught at aft draught mark;


.5.16    mean draught amidships;


.5.17    total free surface moment for initial stability;


.5.18    vertical position of the transverse metacentre;


.5.19    verticalpositionoftheship'scentreofgravity,bothuncorrectedandcorrectedfor free surface effects; and


.5.20    a  statement  giving  the  limiting  value  or  values  of  stability  parameters  for  each stability criterion together with corresponding values achieved.


3.2 Stability Instrument

Astabilityinstrumentinstalledonboardshouldcoverallstabilityrequirementsapplicabletothe ships as follows:


3.2.1    Theinput/outputformatofthestabilityinstrumentshould,asfaraspracticable,beeasily comparableininformationandformattothestabilitybookletsothattheoperatorswilleasilygain familiarity with the loading calculations.


3.2.2    Thestabilityinstrumentshouldreadilyprovideanyinformationthatmaybeobtainedfrom the  stability  booklet  by  incremented  calculation,  reflecting  the  operation  scenario  in  a  clearly presented format.


3.2.3    Asimpleandstraightforwardusermanualwritteninthesamelanguageasthestability bookletshouldbeprovided.  Theusermanualshouldcontaintheapprovedtestconditionsandbe writteninalanguagewithwhichtheship'sofficersresponsibleforcargooperationsarefamiliar.  If this  language  is  not  English,  the  ship  should  be  provided  with  a  manual  written  also  in  the English language.


3.2.4    Thecalculationprogramshouldpresentrelevantparametersofeachloadingconditionin ordertoassistthemasterinhisjudgementonwhethertheshipisloadedwithintheapprovedlimits (refer to paragraphs 3.1.8, 3.1.9 and 3.1.11).

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