ROV Deployed ROV Deployed Friction WeldingFriction Welding
Corrosion ControlCorrosion Control
Circle Technical Services Ltd.Circle Technical Services Ltd.
Aberdeen, Scotland.Aberdeen, Scotland.
Aged AssetsAged Assets
Many assets now beyond original Many assets now beyond original design lifedesign life
Major concerns over corrosion Major concerns over corrosion controlcontrol
Some assets - unprotected since Some assets - unprotected since installationinstallation
Some assets - cathodic protection Some assets - cathodic protection depleteddepleted
Attachment of New Attachment of New AnodesAnodes
Mechanical – not usually Mechanical – not usually acceptable acceptable Crevice corrosion increases resistanceCrevice corrosion increases resistance Vibration loosens fasteningsVibration loosens fastenings
Welded – Preferable to mechanical Welded – Preferable to mechanical attachments attachments wet welding suffers high Hwet welding suffers high H22 levels and levels and
stress corrosion crackingstress corrosion cracking Hyperbaric welding expensive and Hyperbaric welding expensive and
slowslow
THE SOLUTIONTHE SOLUTION
Friction weldingFriction welding Does not suffer problems of electrical Does not suffer problems of electrical
processesprocesses Works at any depthWorks at any depth Fast cycle timeFast cycle time Energy efficientEnergy efficient Fully automatedFully automated ROV friendly ROV friendly
Properties of Friction Properties of Friction Welding Welding
Solid state – no liquid weld poolSolid state – no liquid weld pool Fine grained forged weldFine grained forged weld No weld inclusionsNo weld inclusions No HNo H22 enrichment enrichment No stress corrosion crackingNo stress corrosion cracking No weld dilutionNo weld dilution Little or no cleaningLittle or no cleaning
Welding to Coated PipelineWelding to Coated Pipeline
Friction welding Friction welding through 4 mm of through 4 mm of PTFE coatingPTFE coating
Fusion line of Friction WeldFusion line of Friction Weld
Small heat Small heat affected zoneaffected zone
Fine grain heat Fine grain heat affected zoneaffected zone
Tougher than Tougher than parent materialsparent materials
HMS 3000 Friction Welding HMS 3000 Friction Welding
Tripartite WeldTripartite Weld
Three Three components components welded in one welded in one actionaction StudStud Puck (continuity Puck (continuity
tail)tail) Base (structure / Base (structure /
pipeline)pipeline)
Schiehallion World RecordSchiehallion World Record
Anode Anode continuity tail continuity tail attachments attachments in 395 metres in 395 metres of water.of water.
Schiehallion Anode SledgeSchiehallion Anode Sledge
Pipeline Attachment Pipeline Attachment SchematicSchematic
INFORMATIONINFORMATION
Contact:-Contact:-Circle Technical Services Ltd.Circle Technical Services Ltd.15/16 Woodlands Drive15/16 Woodlands DriveKirkhill Industrial EstateKirkhill Industrial EstateDyceDyceAberdeen AB21 0GWAberdeen AB21 0GWScotlandScotlandPhone +44 (0)1224 775333Phone +44 (0)1224 775333Fax +44 (0)1224 775333Fax +44 (0)1224 775333E-mail E-mail [email protected]@circletech.co.ukWeb Pages Web Pages http://www.circletech.co.ukhttp://www.circletech.co.uk
