4b chemical tanker simulator verification tank cleaning system • overboard discharge and...

Tanker Officer Training Standards (TOTS)

4B Chemical Tanker Simulator Verification Course


CONTENTS

Prerequisites..............................................................................................................................................................................1TOTS Reference....................................................................................................................................................................1Simulator Exercises...........................................................................................................................................................1Exercise Descriptions.......................................................................................................................................................1Physical Realism....................................................................................................................................................................2Behavioural Realism..........................................................................................................................................................2Operating Environment...................................................................................................................................................2Simulator Facility...................................................................................................................................................................2

SimulatorExercisesExercise 1. CargoTankPreparation...................................................................................................................3Exercise 2. CommencingLoading.......................................................................................................................5Exercise 3. Multipleoperations–continueloading,loadintofurthertanks, de-ballasting..............................................................................................................................................7Exercise 4. Multipleoperations–toppingoff,loadingandde-ballasting...........................8Exercise 5. Loadedvoyage–agitationandtankpreparation......................................................9Exercise 6. Commencesimultaneousloadanddischarge..............................................................10Exercise 7. Pre-wash10pand10suponcompletionofdischargeofthe DioctylPhthalate...................................................................................................................................12Exercise 8. Completethedischarge,strippingtherequisitetanks..........................................14Exercise 9. Tankwashing,ventilationandcargocoolingwhileatsea...................................15Exercise 10. Decantpermissibletankwashingsatsea........................................................................17

Appendix I CargoStowagePlan–Afterfirstloadport....................................................................18Appendix II CargoStowagePlan–Aftersecondload/firstdischarge.................................19


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©INTERTANKO2008

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INTERTANKO (TOTS) — 4B Chemical Tanker Simulator Verification Course 1



Prerequisites ThesesimulatorassessmentshavebeendesignedtotakeplaceattheendoftheTankerOfficerTrainingScheme.Thereforeitisexpectedthatcandidateswillhavehadconsiderableexperienceoftheoperationssimulatedhere.Theywillneedthisexperienceinordertobepreparedforthefollowingassessment.

CompetenceDemonstration S Simulated

Q Questioning

TOTS Reference CompetenceTOTS4B Verificationinchemicaltankeroperations

Simulator ExercisesExercise 1. Cargotankpreparation

Exercise 2. Commenceloading

Exercise 3. Multipleoperations,continueloading,loadintofurthertanks,de-ballasting

Exercise 4. Multipleoperations,toppingoff,loading,de-ballasting

Exercise 5. Loadedvoyage,agitationandtankpreparation

Exercise 6. Commencesimultaneousloadanddischarge

Exercise 7. Pre-wash10P&Soncompletionofdischarge

Exercise 8. Completedischargeandstripping

Exercise 9. Tankwashing,ventilationandcargocooling

Exercise 10. Decantpermissiblewashingstosea

Exercise 11. Wash,ventilation,&cooling

Exercise 12. DischargeresiduesatseaaccordingtoMARPOL

Appendix I CargoStowagePlan–AfterfirstloadportAppendix IICargoStowagePlan–Aftersecondload/firstdischarg

Exercise DescriptionsWhatfollowsbywayofexercisedescriptionshasbeenwrittenintheformofstudents’objectives.Inordertopreventmultipleduplication,thenotesmayalsoformguidanceforinstructors.

Forinstructor,supervisorandassessorqualificationsseeSTCW95RegulationI/6,SectionA-I/6paragraph3andA-I/12paragraphs6to9.

INTERTANKO (TOTS) — 4B Chemical Tanker Simulator Verification Course2

Physical Realism IMO Model Course 1.04 Part D Appendix 9Thesimulatorusedshouldfulfilthefollowingminimumrequirements:

• Itwillsimulateatypicalcargohandlingsystemfoundonachemicaltankerbasedonrealoperationalvessels.• Theequipmentisarrangedinashiplikemanner.

Thesimulatorincludesthefollowingcomponentsandsubsystems:

• Cargocontrolsystem• Ballastcontrolsystem• Tankcleaningsystem• Overboarddischargeandmonitoringsystems• Tankcontentmonitoringsystems• Inert/ventingcontrolsystemincludingsparging,gasfreeing,purgingandaerating.• Tankatmospherecontrolsystem• Alarmsystem• Communicationsystem• Cargopumpingsystem• Asystemforcommunicatingwith‘theoutsideworld’• Astabilityandstresscalculator.

Additionalresources: Ship/shorechecklist Tankwashingchecklist NLSCargorecordbookextracts Logsheets

Behavioural Realism IMO Model Course 1.04 Part D Appendix 9Thesimulatormodelreplicatesthedynamicbehaviourofthecargohandlingsystemanditsparameters.Furthermore,thesimulatormodelsimulatesthecomponents,theirprocessesandcontrolsystems.Itwillbepossibletointroducefailures,breakdownsandweartoallequipmentsimulated.

Operating Environment IMO Model Course 1.04 Part D Appendix 9Thesimulatorwillsimulaterestrictionsandfailuresinthecargotransfer,forinstance,introducedbythesimulatedshoreterminal.Alarmswillbeannouncedbyflashingalarmlampsandsoundinthe‘cargocontrolroom’.

Simulator FacilityTheseexerciseshavebeenwrittentakingintoaccountthevarietyofsimulatorswhichmaybeusedtofacilitatethem.Asfewspecificfeaturesaspossiblehavebeenfeatured,soastoincreasetheadaptabilityoftheexercisestothevarioussimulatorsavailable.

Thetankerinthispackageisdoublehulled,has10pairsofwingtanks,2to8ofwhicharesub-dividedintocentreandwingspaces.Eachtankhasitsownpump,ventlineandmanifold.Therearetwoballastpumps.Theballasttankarrangementhasnotbeenspecified.

However,thesimulatorshouldhaveitsownCargoOperationsManualwhichwillbeusedduringtheprogramme.


EXERCISE 1 Cargo Tank Preparation

Current StatusThevesseliscurrentlyatseaontheballastvoyagehavingrecentlyleftdrydock.Mostcargotankshavebeenpreparedforloading,howeverthefollowingtanksrequirewashingwithhotfreshwater,6CP&S,7CP&S,1P&S,2P&S.Freshwatermaybedrawnfromtheforeandafterpeaktanks.

Cargotanks5CP&Sneedtobeinertedwithnitrogen.

Foroperationalreasons6&7CP&Saretobewashedbefore1&2P&S.

Thetankwashingcycleistoincludeatopwashof20minutesfollowedbyabottomwashof20minutesforeachtank.

TheP&Amanualstatesthatonlyamaximumof8washingmachinescanbeusedatonetimeinordertomaintainasuitablewashingpressure.

Washinglineistobepressuretestedto10barbeforewashingcommences.

Sincetherearenocargoresiduesonboard(thevesselhascomefromdrydock)tankwashingsarenotcoveredbyMARPOLandareconsideredcleanenoughtobedischargeddirectlyoverboard.

Nitrogeninertingof5CP&Sistobestartedduringthewaterwashingoftanksatasuitabletime.

Competence Criteria Competence DemonstrationExplainwhenthecargosystemneedstobe Qinertedtoreceivecargoes:

• atwhatstageofthecargocycle

• factorsdeterminingwhetherthesystem needsinerting

Explainthesignificanceofthequalityofnitrogen Qsuppliedtothecargosystem:

• requiredqualityintermsofnitrogenand oxygencontent

• requireddewpoint

Explainthefunctionofthenitrogengenerator: Q

• suggesttwofeaturesnitrogenhasthatprotect thecargo

Demonstratetheoperationofthenitrogengenerator: S

• openandstartrelevantcomponentsofnitrogen systemincorrectsequence

Demonstratethecorrectuseofanoxygenanalyser Stodetermineoxygenconcentrationatvariouspositionswithinthecargosystem:

• operateoxygenanalysercorrectlyandinterpret readingsincontext


Demonstratethecorrectmanagementoftankcleaning Qoperations:

• Identifywhichcargotanksrequirecleaningand establishappropriatecleaningandpreparation methods

Demonstrateanunderstandingoftankcleaning Qprocedures:

• recognisethevarioussourcesoftankcleaning instructions

• giveexamplesofalternativesources

Demonstratecontroloflinepressureindicatingan Sunderstandingoftheneedtoreducepressureinalinepriortoopeningvalves:

• setuplinesfortankwashing S

• bringpowerontowashinglinesystemcontrolling S valvesandlinepressureappropriately

• repeatlinepressurecontrolwhenchangingtanks S

Demonstratethecorrectsettingsforthetankwashing Scycles:

• consultoperatingmanualoralternativeappropriate adviceformachinesetting

Explainwhytankcleaningproceduresvarysomuchon Qchemicaltankers:

• whichfactorscausethevastarrayofoptions?

Describeroutinechecksoncargotankspreviously Qinerted:

• whyisitimportanttomonitortheatmospherein cargotankswhicharenotcurrentlybeingworked?

Keepanaccurateandcompletelogofrelevantevents. S


EXERCISE 2 Commencing Loading

Current StatusThevesselissecurelymooredportsidealongside.Theshipshorechecklisthasbeencompleted.

Thevesselwillbeloadingthefollowinggradesatthisfirstloadport:

1P&Sand2P&S SodiumHydrosulphideSolution45%

3CP&Sand4P&S Phenol

6CP&Sand7CP&S Proprionitrile

8CP&Sand9CP&S HexanoicAcid

10P&S DioctylPhthalate

Ofthesegrades,SodiumHydrosulphideSolution45%,Proprionitrile,andDioctlyPhthalatewillbestartedfirst.PhenolandHexanoicAcidwillbestartedapproximatelytwohoursaftertheloadingofthefirstthreegradesattheterminalrequest.

Bearinmindtheagreedmaximumloadingratesforeachtankinrelationtoitsventingcapabilities.

Priortostartingtheexerciseyouarerequiredtoproduceade-ballastingplantoaccommodatetheloadingofthesegrades.

Youshouldagreewiththeterminalthesamplingprocedurestobefollowedforeachgrade.

Competence Criteria Competence DemonstrationDemonstratethemethodsandproceduresnecessary Qtosafelyprepareandcommencealoadingoperation:

• testthevariousrequiredalarms,includinghigh S levelandoverflowalarmsandpumptrips

• testthecommunicationsystemsbetweenthe S relevantparties

• completetheship/shorechecklist S

• Withwhomshouldthischecklistbecompleted? Q

Determinewhichcargoes,ifany,willrequirevapourreturnlines:

• checkdatasheetsand/orcharterer/shipper S instructions

Explainhowtankswillbeverifiedashavingbeenpreparedadequatelyforloadingtocommence:

• Whatcantheship’sstaffconducttoindicatea Q tank’scleanliness?

• Whatcantheship’sstaffdoiftheseindications Q arenotappropriate?

• Whatwill‘independent’cargosurveyorsconduct Q forthesamepurpose?

• Ifthe‘independent’surveyordoesnotpassacargo Q tankforloading,whathappens?


Onceloadinghascommenced,whatadditionalcargo Qqualitycheckmaybeemployedbythecargosurveyor?

• Describethetypeofrateatwhichloadingshould Q commence

• Explainwhatshouldbetakenintoaccountwhen Q determiningthisinitialloadingrate.

• Explainwhatships’staffneedtoensureduringthis Q additionalcheck,ifnecessary.

Iftheaforementionedadditionalcheckisnotrequired, Sdescribeatwhichpointtheloadingratemaybeincreased.

Oncethisfinalverificationhasbeencompletedandloading Sresumes,demonstratehowtoestablishandmaintaintheagreedandappropriateloadingrate:

• Explainwheresuchdetailsforthistankerwouldbe Q recorded

Keepanaccurateandcompletelogofrelevantevents.


EXERCISE 3 Multiple operations – continue loading, load into further tanks, de-ballasting

Current status:Thevesselhasalreadystartedtoloadthefollowingcargo;

1P&Sand2P&S SodiumHydrosulphideSolution45% 6CP&Sand7CP&S Proprionitrile 10P&S DioctylPhthalate

Thisexercisewillinvolvethecontinuedloadingoftheabovecargoesandthecommencementofthefollowing;

3CP&Sand4P&S Phenol 8CP7Sand9CP&S HexanoicAcid

ThePhenolparcelwillbeloadedintotanksconnectedtoavapourrecoverymanifold.

Youwillhavemadeade-ballastingplaninordertocounteractthestabilityimplicationsandstressesimposedbythemovementoftheseparcels.

Competence Criteria Competence DemonstrationThestudentshouldbefamiliarwiththemanagementofmultiplesimultaneousoperations.Thiswillincorporatemonitoringtanksatdifferentstagesofloadingandde-ballasting.

Commenceloadinginfurthertanksandbydemonstration:

• repeatpreparationandmonitoring S offurthertanksbeingloaded

• continuetomonitorallothercargotanks. S

• explainwhythisisnecessary. Q

• Explainwhatspecificallyrequiresmonitoringinother Q tanks.

• Explainwhatthecauseofanyanomalycouldbe. Q

• Explainexamplesofcausesofconcerninthiscontext. Q

• Explainhowyoucouldutilisetheresourcesatyour Q disposaltoassistwiththismonitoring.

• Explainunderwhichconditionsyouwouldyou Q allowfurthertankstobeloaded.

• Demonstrateunderwhichconditionsyouwould S commencede-ballastingoperations.

• Demonstratewhatelse,otherthancargoandballasttanks, S youwouldmonitorduringcargoandballasttransfer.

• Demonstratewithwhomwouldyourequirechannelsof S communicationduringsuchanactivity.

• Explainwhichlegislationgovernsatmosphericemissions Q fromtankers.



EXERCISE 4 Multiple operations – topping off, loading and de-ballasting.

Manageatoppingoffoperation,whilstcontinuingtoloadothertanksandde-ballast.

Current status:Thetankeriscurrentlyloadingfivedifferentparcelsinto18tanks.Threeoftheparcelsin10tanksareabouttobetoppedoff.Loadingofafurthertwocargoesinto8tankscontinues,withthePhenolparcelrequiringvapourrecovery.

De-ballastingwillalsocontinue.

Thefollowingtankswillbetoppedoffduringthisexercise;

1P&Sand2P&S SodiumHydrosulphideSolution45% 6CP&Sand7CP&S Proprionitrile 10P&S DioctylPhthalate

Loadingwillcontinueinto;

3CP&Sand4P&S Phenol 8CP7Sand9CP&S HexanoicAcid

Competence Criteria Competence DemonstrationTopoffrelevantcargotankswhilstcontinuingtoloadothertanksandcontinuingtode-ballast:

• Demonstratehowyouwillpreparetoconductthese S operationssimultaneously.

• Explainwhatspecificprecautionsyouwilltakewith Q regardtotoppingoff.

• Explainwhatadditionalchecksyouwillyoumake Q specificallypriortotoppingoff.

• Explainthebenefitsofestablishingalogical Q sequenceoftankstobetoppedoff.

• Explainthesignificanceofcontrollingthelistand Q trimatthisstage.

• Demonstratethecontrollingloadingratesprior S toandduringthetoppingoffprocedure.

• Explainthedangerassociatedwithclosingatank Q valveagainsttheflowofoilfromashore.

• Explaintherespectivebenefitsanddisadvantages Q ofa‘shipstop’anda‘shorestop’.

• Explainhowcargowillbeclearedfromtheshore Q lineuponcompletionoftoppingoff.

• Describehazardscommonlyassociatedwithline Q clearing.

• Howcantheseproblemsbeavoided. Q



EXERCISE 5 Loaded voyage – agitation and tank preparation

Current Status:Thevesselisatsea,partiallyloaded.ThePhenolcargorequiresre-circulatingand,priortoarrivalatthenextport,thetankspreparedtoreceiveIsophoroneDiisocyanateneedtheiratmosphereschecking.

Theshipwillbeatseaonaloadedpassagewiththepowerononlyforcargomonitoringsystems.Powerforoperatingcargopumpsandvalveswillneedtoberequestedandestablished.

Competence Criteria Competence DemonstrationExplainanddemonstratetherequirementandmethodof‘agitating’acargo:

• Explainwhoismostlikelytoissueinstructionon Q agitation.

• Explainthepurposeofagitatingorre-circulatinga Q cargoonaloadedpassage.

• Demonstratethatpowerisavailabletoworkthe S cargopumpsontherequiredtanks.

• Demonstrateselectionofthetankswhosecargo S requirere-circulation.

• Demonstratewhichvalvesandlinestosetin S ordertore-circulatethePhenolparcel.

• Demonstrateroutinemaintenancechecksthatare S carriedoutoncargopumpsbeforeandafteruse.

• Explainwhatactionsshouldbetakenintheevent Q ofaleakofPhenolontothedeckduringthe re-circulationofcargo.

Demonstratetheprinciplesofhydraulicpumpoperation;

• Demonstratecorrectpumpstartingprocedure. S

• Demonstratesafepumpingpractice. S

• Demonstrateanadequatemonitoringoftanksand ensurenocargovapourescapesintotheatmosphere otherthanthroughthedesignedventingarrangements.

• Demonstratethedecklinestobedrainedbackinto S thecargotanks.

• Uponcompletionofthistaskre-checkbydemonstration S thattheatmospherein5CP&Sissuitableforthe loadingofIsophoroneDiisocyanate.

• Explainwhythetankatmosphereinthetankscarrying Q IsophoroneDiisocyanaterequiresmonitoring.

• Explainwheresafetyinformation,regardingthesecargoes Q wouldbeavailable.



EXERCISE 6Commence simultaneous load and discharge

Current Status:Thevesselisallfastalongside,portsidealongsideawaitingtheoutcomeofthetankinspectionandpre-cargomeeting.Duetoterminalrequirementsthedischargingofallfourgradesistobecommencedbeforeanyloadingisstarted.Youarerequiredtoplantheorderinwhichthegradesaredischarged.Allgradesaretobecompletelydischarged.

Thedischargeofthefollowingparcelsisplannedforthisport:

DioctylPhthalate from 10P&S SodiumHydrosulphideSolution45% from 1&2P&S Phenol from 3CP&S,4CP&S HexanoicAcid from 8CP&S,9CP&S

Oncedischargeoftheabovegradesisunderwayyoumustcommencetheloadingofthefollowingthreegrades.

Loadingofthefollowingcargoesisplanned:

Propylbenzene into 3P&S,4P&S,5P&S DiethyleneGlycol into 6P,7P,8Pand9P Cyclohexanol into 6S,7S,8Sand9S

AparcelofIsophoroneDiisocyanateisalsotobeloadedatthisport.Howeverduetoproblemswithintheterminaltheloadingofthisparcelisnottostartuntiltheloadingoftheother3gradeshasbeencompleted.

IsophoroneDiisocyanate into 5CPand5CS

ThetanksloadingPropylbenzeneandIsophoroneDiisocyanatewillrequireavapourreturnline.De-ballastingwillneedtobeplannedinlinewithloading/discharge.

Competence Criteria Competence DemonstrationDemonstratemanagementofmultipleconcurrentoperationsincludingloading,dischargingandde-ballasting.

• Demonstratethatcargoplanhasbeenfollowed. S

• Demonstratecompletionofthestandardchecklists S priortocommencingcargooperations.

• Explainwhichtanksrequireaninspectionandwhich Q donot.

• Explainwhichtanksrequireawallwashtest. Q

• Describetheentryrequirementsintothetankstobe Q inspected.

• DemonstrateeffectivecommunicationwiththeJetty S Operator,deckwatchandanyotherrelevantparties.

• DescribetheoperationofFramopumps Q

• DemonstratethecorrectwaytostartaFramopump S

• Demonstratethecorrectwaytostartdischargefrom S atank.


• Describethecheckstobemadeatthestartof Q dischargingatank.

• Describethedangerofoverflowingtanksconnected Q tothesamelinewhenstartingtodischarge.

• Explainwhereinformationandadviceregardingtank Q preparationislikelytocomefrom.

• Describewheretheminimumsafetycriteriaforthe Q carriageofthiscargoarelisted.

• Explainwhatspecificcarryingconditionsaregenerally Q requiredforthesecargoes.

• Explainwhatformsofcontaminationthetankinspections Q wouldbeinvestigating.

• Describewhatproceduresshouldbeadoptedatthestart S ofdischargetominimisethepossibilityofpressure surgesinthelines.

• Explainwhyisitimportanttoincorporateflexibilityinto Q thecargoplan.

• ExplainwhytheDiethyleneGlycoltanksmightnotbe Q loadedto98%full.

• Explainwhatfactorsmayimpactonthemanifold Q back-pressuresindicated.

• Describewhatfactorscouldaffecttheoverallefficiency Q oftheoperation.

• Explain,otherthanforsafety,whyefficientperformance Q isimportant.

• Explainwhichparcelwillrequireitstankspre-washing Q assoonasithasbeendischarged.

• Demonstratehow,oncecargooperationsareunderway, S ballastcanbeworkedtotheadvantageofthecargo operations.

Keepanaccuratelogofevents.


EXERCISE 7 Pre-wash 10 p and 10 s upon completion of discharge of the DIOCTYL PHTHALATE

Current Status:Concurrentlywithbothloadinganddischarge,thepre-washof10PandSmustbeundertaken.

Loadingcontinues;

Propylbenzene into 3P&S,4P&S,5P&S DiethyleneGlycol into 6P,7P,8Pand9P Cyclohexanol into 6S,7S,8Sand9S

Dischargeisalsobeingundertaken;

SodiumHydrosulphideSolution45% from 1P&S,2P&S Phenol from 3CP&S,4CP&S HexanoicAcid from 8CP&S,9CP&S

Competence Criteria Competence DemonstrationUnderstandtherequirementofandperformapre-washofthetanksfromwhichDioctylPhthalatehasjustbeendischarged.

Understandthebenefitofplanningahead,inorderto Smakebestuseofthetimeavailable,thebestuseofresourcesandthebenefitofsequencing.

• Whichsourcesofinformationneedtobeconsulted, Q whenplanningthispre-wash.

• Identifythecorrectwashingmedium Q

• Completeapre-washingchecklist S

Demonstratemanagementofloading,discharging,tankwashingandballastingsimultaneously.

• Explainwhichpublicationneedsconsultation,giving Q thetechnicalrequirementsofthepre-wash.

• Describethevariouspre-washrequirementsand Q procedures.

• Explainwhichindividualisrequiredtowitnessthe Q pre-wash,asindicatedabove.

• Explainwhatthealternativeoptionsare,ifsuchan Q officialisnotavailable.

• Explain,otherthanfollowingtheproceduresdetailed Q inthepublicationidentifiedabove,whichothersource ofinformationwillindicatetheconcentrationofcargo residueinthewashingsbeingstrippedashore.

• Explainwhichcheckwillconfirmthattheresiduesofthe Q pre-washbeingpumpedashoreindicatethatthetanks areclean.

• Explainwherethedetailsofthispre-washwillbe Q recorded.


• Explainwhatwillberequiredonthetankwashingsystem, S oncewashinghasbeencompleted.

• Demonstratethepre-planningthatisrequiredtoenable S thepre-washtobestartedwithoutjeopardisingother concurrentoperations.

• Demonstratehowtheapparenttrimdifficultiesarising S fromwiththeneedtocompletedischargeofDioctyl Phthalatefromtheaftcargotanksfirstcanbeovercome.

• Demonstratewheretheverificationofthepre-washwill S berecordedandhowitwillbeverified.

• Explainhowyouwillknowifthetankwashingmachines Q arefunctioning.

• Explainwhyitissonecessarytostripthetanksdry. Q

• Describewhichsourcesofinformationcanbe Q consultedforinformationregardingstrippinglimits.

• Describethepracticalimplicationsassociatedwiththe Q poordrainingofthecargosystem.

• Describethecommercialimplicationsassociatedwith Q thepoordrainingofthecargosystem.

• Explainhowthepumpisstrippedofcargo. Q

• Describehowthepumpcanbecontrolledintheevent Q ofafailureofthecontrolsystemincargocontrolroom.


EXERCISE 8 Complete the discharge, stripping the requisite tanks

Current StatusDischargingandloadingcontinue.Twelvecargotanksarenearingtheendofdischargeandwillneedtobedrainedandstripped.Thecargopumpswillalsoneedtobestrippedoncompletion.

Ballastiscurrentlybeingtakenonboard.

Donotneglectotheroperationssuchastheloadingofcargoelsewhere.Itwillbeimportanttomaintaineffectivecommunicationswiththedeckwatchandwiththeterminal,toensurethatcargoisbeingstrippedashoreasintended.

Youwillberequiredtoproduceaplanforthispartoftheoperation.

Competence Criteria Competence DemonstrationControlthepumpsduringdrainingofthetanksandcompletestrippingoftankspumpsandlines.

Demonstratepumpcontrolduringthedrainingoftanks:

• Demonstratethestrippingofcargotanksandpumps S usingtheappropriatestrippingmethods.

• Demonstratemanagementofresourcesand S communicationstoexpeditethecompletionofdischarge.

• Demonstratemonitoringofallthetanksbeingloaded S anddischarged.

• Demonstratecontrolofthevessel’strimtoprovide S adequatetankdraining.

• Demonstratekeepingtheterminalinformedofthe S progressofthedischarge.

• Demonstratethecompletionofthedocumented S proceduresinordertosatisfybothregulatoryand commercialrequirements.

• Statewhetheranyofthesethreeparcelsrequireapre-wash. Q

• Explainwhichsourceofinformationwillindicatewhich Q parcelsrequirethis.

• Explainwhatshouldhappentothepumpdirectlyafter Q strippingiscompleted.

• Explainwhypurgingthepumpcofferdamissoimportant Q withthistypeofpump.

• Describewhatpurgingrecordsshouldbekept. Q

• Explainhowchangingthesequenceofstrippingcan Q beanadvantage.

• Describeinwhatwaystheoperation Q couldhavebeenbetterplanned.

KeepanaccuraterecordofeventsandensuretheNLScargorecordbookhasbeenupdated.


EXERCISE 9 Tank washing, ventilation and cargo cooling while at sea.

Current StatusThevesselisatseasailingataround16knots,approximately7milesfromthenearestland.Thecargoordersforthenextloadinghavebeenreceivedanditcanbetakenthatthestandardofwashingrequiredis‘waterwhite’.Thenextcargoeswillbelowspecificationandnon-aggressive.

ThetanksthatcontainedHexanoicAcidaretobewashed.

ThetankswhichcontainedPhenolaretobecleaned.

TheIsophoroneDiisocyanatecargotemperaturehasbeenallowedtorisetoabout17°C,whichisisneartotheupperacceptabletemperaturelimit.Thecoolingsystemistoberuntopreventanyfurtherriseintemperatureandtocoolthecargobyafewdegreesoverthenext48hours.

Competence Criteria Competence DemonstrationVentilatetanks3CP&S,4CP&S,whichpreviouslycontainedPhenol,inordertocoolthecargoofIsophoroneDiisocyanate

• Explaintheappropriatetankcleaningprocedures Q relatedtothenatureofthecargoresidueremaining.

• Explainwhichcargotanksmaybecleanedby Q ventilationalone.

• ExplainwhichoperationsneedrecordingintheNLS Q CargoRecordBook.

• Describewhichpublicationstoconsultinorderto Q planthewashingprogramme.

Demonstrateanunderstandingofwhichfactorswillinfluencethewashingprogramme:

• Explainwhatmightinfluencetheefficiencyof Q thetankwashing,cleaningandpreparationoperation.

DemonstrateanunderstandingoftherecommendedproceduresformaintainingthetemperatureandqualityoftheIsophoroneDiisocyanatecargoparcel:

• Explainhowtheefficiencyoftemperaturecontrol Q beassessed.

• Demonstratethecorrectwaytostartthecooling S system.

• Demonstratethere-circulationofcargothrougha S heatexchangerinordertocoolacargo.

• Demonstratehowtocontroltheflowratesand S pressuresinaheatexchangerinordertominimise thepossibilityofcargocontaminationintheeventof aleakwithintheheatexchanger.

• Explainwhichtanksaretobewashed. Q


• Explainwhatsortofwashingmediumshouldbe Q used.

• Demonstratethewashingcyclethatshouldbe S utilised.

• Explainhowthetankwashingsaredealtwith. S (vesselisonly7milesfromthenearestland).

• Demonstratewhichtankscanbeusedas S sloptanks.

• DemonstratehowthePhenoltankscanbe S cleaned.

• Describewhatoptionsthereareforventilating Q thesetanks(topbottom,bloworextract).

• Explainwhatistheidealcarriagetemperature Q isfortheIsophoroneDiisocyanate.

• Explainwhatoptionsarelikelytobeavailablefor coolingonthisshipiftheIsophoroneDiisocyanate cargoisalittleabovetheidealtemperature.

• Explainifthefreshwatercooleror Q thermaloilcoolershouldbeused.

• Explainwhatchecksshouldbemade Q whencoolingthecargointhisway.

• Statewhetherthepressureofthe,coolantin theheatexchangershouldbehigherorlower thanthepressureofthecargo.

• Explainhowthepressuresintheheatexchanger Q shouldbecontrolledinordertoreducethepossibility ofcargocontaminationifthereisaleakwithinthe heatexchanger.

• Explainwhichchecksshouldbemadeonthe S atmosphereintheIsophoroneDiisocyanatetanks.

• ExplainhowtheatmosphereintheIsophorone Q Diisocyanatetankscanbemaintained.

• Describewhichrecordsshouldbekept Q duringtheseoperations.


EXERCISE 10 Decant permissible tank washings at sea

Current StatusThevesselisatsea,outsideofaspecialarea,underwayataspeedinexcessof16knotsandinwaterofabout75metresdepth.Thenearestlandisabout17.5milesaway.

Slopsarecontainedin10P&ScargotanksandaretheresiduesofthetankwashingpreviouslycarriedoutinthecargotanksthatcontainedHexanoicAcid.

Competence Criteria Competence Demonstration

• Explainwhichslopsmayandwhichmaynotbe Q dischargedatsea.

• Describetheareaswhereslopsmayormaynot Q bedischarged.

• Explainhowthedischargeofslopsiskeptwithin Q theparameterssetoutinMARPOLAnnexII.

• ExplainhowthedetailsoftheP&Amanualare Q followedinordertocomplywiththeprovisionsof MARPOL.

Setupthedeckfordischargeoftheslops,throughtheappropriatepipingarrangements:

• Describethepreparationofaslopdisposalplan. S

• Demonstratethemanagementofaslopdisposal S plan.

• Setupthedecklinesfordischargeofthe S appropriateslops,throughtheover-boarddischarge facility,intothesea.

• Statewhethertheresiduesofthecargoesmay Q bemixedinthesamesloptank.

• Explainwhichchecksshouldbemadeonthe Q statusoftheothercargotanksduringthisoperation.

Maintainanaccurateanddetailedlogofevents.


APPENDIX I

CARGO STOWAGE PLAN AFTER FIRST LOAD PORT

DioctylPhthalate

HexanoicAcid

Proprionitrile

Phenol

SodiumHydrosulphideSolution40%


APPENDIX II

CARGO STOWAGE PLAN AFTER SECOND LOAD / FIRST DISCHARGE

DiethyleneGlycol

Proprionitrile

IsophoroneDiisocyanate

Cyclohexanol

Propylbenzene

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4b chemical tanker simulator verification tank cleaning system • overboard discharge and...

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