Subsea Pipeline IMR - Indonesian Gas...

Subsea Pipeline IMR PT Hallin Marine June 18th, 2014!

© Hallin Marine. All rights reserved.!2

Introduction

Issues and Risks

Inspection, Maintenance & Repair

Case Study

Conclusions and Recommendations

Subsea Pipeline IMR

Introduction


q  Obtain data to assess the internal and external condition of a pipeline!

q  Detect anomalies that may affect the integrity of the pipeline!q  Analyse results and trends to predict potential for failure!q  Implement measures to mitigate effects of anomalies!q  Carry out repairs in the event of failure!

Subsea Pipeline IMR

Subsea Pipeline IMR


q  Integrated Subsea Contractor!q  Project management, engineering and all

offshore and subsea resources to carry out;!§  Pipeline inspection!§  Maintenance and repair works!

q  IMCA registered diving and ROV contractor!q  Complying with OGP guidelines!q  Owned and operated vessels, survey and ROVs!q  Manufacturer of own diving systems!q  Operating to the highest standards or safety and

environmental awareness!

Subsea Pipeline IMR

Hallin Marine

Issues and Risks


q  What if!…a pipeline fails?!

§  Cost of clean-up and repairs!§  Loss of production revenues!§  Damage to the environment and ecology!§  Loss of reputation!

Subsea Pipeline IMR

Issues and Risks


q  Causes of Pipeline Degradation!§  Internal erosion!§  Internal corrosion!§  External corrosion!§  Mechanical stresses!§  External damage!

Subsea Pipeline IMR

Issues and Risks

Inspection, Maintenance and Repair


q  Internal Pigging!§  Cleaning – to remove rust, scale and wax!§  Ultrasonics to detect pitting, corrosion, cracks and weld

defects!§  Calipers to check for deformation!§  Odometer and other sensors to determine the distance

travelled and position!§  On-board data recording!

q  Acoustic sand monitoring!!

Subsea Pipeline IMR

Inspection


q  External inspection!§  Visual inspection by ROV to identify!

o Coating damage!o  Anode depletion, damage or absence!o  Exposed pipe and freespans!o  Presence of debris!

§  ROV sensors to determine!o CP system performance!o  Length and height of freespans!o Depth of burial!o Wall-thickness!o  Position of pipe!

§  Non-destructive Testing!o Generally carried out by divers!o  ACFM to detect surface cracking!o  ToFD for detecting cracks beneath the surface!

!

!

Subsea Pipeline IMR

Inspection


q  Erosion control!q  Corrosion control!q  Free-span remediation!

!

Subsea Pipeline IMR

Maintenance

Grout bags to support

suspended pipe

‘Frond’ mattresses help to prevent

scouring

Lower pipe below natural seabed level

Rock Dumping Complete Protection


q  Locate and identify extent of breach!§  ROV survey!§  Dyes!

q  Expose pipe!§  Localised dredging e.g.!

o X-Subsea’s T8000 Mass-flow excavator!o Proserv’s 150R Dredging System!

§  Provide 3600 access to pipe!

Subsea Pipeline IMR

Pipeline Repairs


q  Cracked pipeline!§  Install supports!§  Remove Weight-coat!§  Install repair clamp!§  Pressure test!§  Install further support and/or re-bury!

Subsea Pipeline IMR

Pipeline Repairs


q  Buckled pipe!§  Prepare repair spool onshore!§  Select cut locations to remove damaged section!§  Install supports!§  Rig for recovery and cut out damaged section!§  Remove weight-coat and bevel pipe-ends!§  Install flanges!§  Perform spool-piece metrology!§  Adjust repair spool length!§  Over-board from Vessel and position!§  Position gaskets and commence bolting!§  Tension bolts and pressure-test gaskets!§  Install further support and/or rebury pipe!

Subsea Pipeline IMR

Pipeline Repairs

Case Study


q  The problem!§  Platform subsidence posing significant risk of damage to

flowlines!§  Potential for fractures due to upheaval buckling, torsion, etc.!

q  The Solution!§  PT Timas Suplino was awarded contract to install measures to

by-pass the platform!§  Hallin Marine was awarded a sub-contract to install 9 hot tap

assemblies supplied by TD Williamson!§  Working with Antares Energy Solutions, Hallin Marine developed

installation procedures, mobilised marine and subsea resources and successfully carried out the works!

!

!

Subsea Pipeline IMR

Case Study


q  Phase 1 - Preparation!§  Five pipeline and three cable crossings were prepared!§  Dredged around each hot-tap location and removed the weight-

coat at the tapping location!§  The exposed sections of pipe were inspected for out-of-

straightness, ovality, wall thickness to ensure their suitability for hot-tapping!

q  Phase 2 – Hot-tapping!§  Equipment checks on deck!§  Deployment from the construction vessel’s crane and positioning

by Hallin’s divers deployed from the DSV Ullswater!§  Tapping operation controlled from deck by TDW’s technicians!

!

!

Subsea Pipeline IMR

Case Study


q  Phase 3!§  Install valve skids!§  Metrology and installation of tie-in spools!§  Activate hot-tap ‘Stopples’ to divert gas flow !§  Additional valves/skids installed to provide future valve

regulation!§  Installation of protection frames!§  Installed lock O-rings, removed tapping machine and installed

blind flange it its place!

!

!

Subsea Pipeline IMR

Case Study


Subsea Pipeline IMR

Case Study


Subsea Pipeline IMR

Case Study

Deploy hot tap assembly! Hot tap function!

Install valve and spool pieces!Install pipe end-flanges! Protection structures!

Conclusions and Recommendations


q  A pipeline incident is likely to have a severely detrimental affect on the environment and ecology!

q  Cost of clean-up and loss of production might be calculated!q  The damage to the Company’s reputation and its relationship with

the host nation could be overwhelming!q  A Risk-based Inspection (RBI) management strategy should be

designed to ensure the integrity of the pipelines!q  Timely attention to anomalies such as freespans, damage to

coating and depleted, missing or damaged anodes will reduce the risk of future failure!

q  Holding critical components/long-lead items and assuring access to key resources and services will allow the Company to react quickly to the requirement for an emergency pipeline repair!

Subsea Pipeline IMR

Conclusions


q  Hold stock of critical, long-lead components!§  Pipeline repair clamp!

o Should be compatible with pipeline and platform riser!§  Length of coated pipe!

o Say 100m, for fabrication of repair spool!§  Two pairs of flanges!§  Three (2+spare) KaMOS®, or similar, gaskets!

Subsea Pipeline IMR

Recommendations 1


q  Secure rapid access to key tools and materials!§  Dredging system!§  Diamond wire cutting system!§  Weight coat removal tool!§  Bevelling tool!§  Grout bags!§  Subsea services!

q  Ensure there is a platform to deploy equipment and personnel to carry out repair. !§  A vessel or barge with deck space and accommodation for

personnel will be required for saturation diving and ROV services!

!

Subsea Pipeline IMR

Recommendations 2


q  Plan ahead!§  Develop an Emergency Response Plan covering;!

o Shut down o Rapid inspection spread mobilisation to ascertain the

location and extent of any damage o Development of bespoke repair procedures o Repair spread mobilisation o Communication with authorities, local communities and

the press §  Develop repair methodologies!§  Form a Consortium!

o Share plans, resources and costs with other operators!!

Subsea Pipeline IMR

Recommendations 3

THANK YOU www.hallinmarine.com!

Rev 12-09

Subsea Pipeline IMR - Indonesian Gas...

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