5 3 marine operations 500m safety zone...marine operations 500m safety zone 1 approach passage &...

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Vessel Installation

MARINE OPERATIONS500M SAFETY ZONE

1 Approach passage & pre-entry

• Vessel passage plans must not have installations as waypoints.Finalwaypointmustbeoffsetfromtheinstallation

• Establishcontactandensurethatradio-workingchannelsareunderstood

• Pre-entrycheckstobecarriedoutinadriftoffsituationtestinginteraction/communicationswithinstallation.Determinewho(ontheinstallation)isresponsibleformaintaining contact with the vessel

• Shouldcontrolofthevesselbetransferredtoanotherstation(e.g.fwdtoaft)oradifferentoperatingmodeisselected(e.g.manualtofullDP)thenitshouldbeensuredthatallmanoeuvringarrangementsarerespondingasanticipatedbeforeundertakinganycloseproximityoperations

• Discusstheplannedapproachandproposedwork• Anyinstallationdelaysexpected?Bulktransferpermits?

Weathersideworkingriskassessment?Installationstaffavailability?Notifyvesselifanyoverboarddischargesfromtheinstallationcouldaffectoperations

• DPreferencesystemtargetsincorrectpositionandready(reflectorscleanetc)

• Identifyandsettriggerandholdpointswhichdetermineoperationstart/stop/holdorpromptariskassessmentorriskassessmentreview

• Vesseltoconfirmtoinstallationoncereadytoentersafetyzone

Only once the installation is fully satisfied that the vessel has undertaken the necessary pre-entry checks and that the work plan minimises the length of time the vessel will be required to be in close proximity to the installation should permission to enter the safety zone and proceed to the set-up location be given. Ifithasbeenidentifiedthatworkinginadriftonconditionwillberequiredthen,beforepermissiontoenterthe500msafetyzoneisgiven,ariskassessmentmustbeundertakenbyboththevesselandtheinstallation,mitigationsputinplaceasrequiredandagreementbetweentheOIMandVesselMastermadebeforeallowingoperationstobeundertaken.

3 Position set-up

Thisistheprocesswherebyvesselpersonneldeterminehowadequatelythevesselismanagingtoholdpositionbeforestartingthefinalapproach.Thisshouldbedonefarenoughawaysothat,ifsomethinggoeswrong,thevesselcrewhaveenoughtimetotakecorrectiveaction.ItcantakesometimetoacquireastablepositionandallowaDPmodeltobuildup(upto30mins)Positionset-uptotakeplacewellawayfromtheinstallation(positionsuchthatinstallationcollisionavoidedifequipmentfailureoccursduringsetupchecks)• 1½xvessellengthfordrift-offoperations• 2½xvessellengthfordrift-onoperations

Duringthistimethevesselpersonnelaretosatisfythemselvesthat:• DPreferencesandsensorsarestable• Vesselmotioniswithinoperationallimits• Vesselmachineryoperationwithinlimitsi.e.powerutilisationnotgreaterthan45%

4 Final approach (200m approx. - working position) & alongside working

Oncesatisfactoryset-upchecksarecompleteandpermissionhasbeengivenbytheinstallationtomovetotheworkinglocation,thevesselshouldbemanoeuvredtowardstheinstallationinincrementalsteps(circa10m)atatimeusingprogressivelysmallersteps.Iftheoperationisgoingtoinvolveworkingina‘drift-on’condition,thenajoint(installationandvessel)riskassessmentmustbeundertaken.• Speed≈0.5kts(0.3m/s)• Minimumseparationdistancestobemaintained

5 Exiting safety zone

Onceoperationsarecompleteandthevesselisreadytodepartthesafetyzonethefollowingshouldoccur:• Confirmmanifests/DGnotesallon-board• Hose(s)disconnectedandclear• Decksecure(seafastened)fortransit• Vesselsecure• Movetoset-upposition• Departsafetyzoneinacontrolledmannerfollowingrecommendedspeedsasperentryprocess• Transfercontrolsonceoutsidesafetyzone• Onceoutsidesafetyzonevesseltoobtaininstructions(clientcontroletc.)• ProvideETAsfornextlocation

2 Approach (500m - 200m approx.)

Approachandworkalongsideinstallationtobemadeinthesamemodeastestedduringpre-entryprocess.Should‘modeofoperation’orcontrolstationbechangedthenthefullrangeofsystemchecksshouldbeundertakenagaintoensurethatsystemsareoperatingcorrectly.Acorrectapproachshouldhavethevesselcomingalongsideobliquely.Thevesselshouldnotapproachheadon.• Speedtobe3knotsorless,dependingonthevessel

typeandweatherconditions• EscaperoutesidentifiedThe faster the vessel comes in the harder it could hit the installation!

Pre-Entry > Set up > Working > Exit

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