SUBSEA CONTROL SYSTEMS

• Flushing - Hygeinic assembly practices -Flushingatasufficeintpressureandflowratetoensure turbulentflowisachieved• Testing -Confirmfluidcleanlinessviapatchtestkit -Removesensitiveequipmentpriortoflushing -Loophosestoreduceflushingtime -Usenon-bypassfilters

• FluidCompatability -Componentmaterial - Seal material -Operatingconditions• FluidContamination -Bacteriagrowth -Gasmigration/contamination(emulsification) -Moisturecontamination(humidity/emulsification)• FluidCleanlinessStandards - NAS1638 -SAEAS4059RevE -ISO(ISO4406-1999)

COMPONENT CONSIDERATIONS

• Pipework -Cleanlinessduringmanufactureiscritical• Hoses -Pighosesbeforeendfittingsareapplied -Installationiscritical(abrasion/kinking/environmental issues)• Accumulators -Storewithpartialfill -Chargegasslowly• Pumps&Motors -Pre-charge/bleedtoprovideadequatelubrication -Ensuremotorcaseisfull -Performrotationcheckswithnoload

• Cylinders -Ensuresystemisfullybled• Regulators -Screwdowntonearmaximumpressure -Primeatalowpressure -Cycletocheckrepeatability• PressureReliefValves -Removefromsystemsduringflushingandtesting -Setandcertifyoff-line

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START-UP RISK REDUCTION

• Initialbuildcleanliness• FactoryAcceptanceTesting(FAT) -Individualcomponentistested• SystemIntegrityTesting(SIT) -Fullstackuptesting• Pre-Commissioning -Checksonallcomponentsoffline

• CommissioningProcedures -Detailedproceduresandchecklistsshouldbe developedinconsultationwtihtheOEM’sfor eachsystemandsubsystem. -Stagedcommissioning - Baseline HPU systems• PostStart-up -OngoingMonitoring

Fluid Cleanliness is the key to success

Commissioning of Subsea Hydraulic Systems

Poorpreparationandprocessesatstart-up/commissioningcanresultindamagetohydrauliccomponents.Thisdamagecanbecatastrophicatstart-up,ormaynotbecomeapparentuntilmanyyearslater.Damagecanbepreventedby: