TECHNICAL PROCEDURE FOR JACKET INSTALLATION.pdf

PROCEDURE FOR WELLHEAD PLATFORM JACKET INSTALLATION

JULY, 2014

PROCEDURE FOR WELLHEAD PLATFORM (WHP) JACKET INSTALLATION

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Table of Contents 1.0

PURPOSE ...................................................................................................................................... 3

2.0

SCOPE ............................................................................................................................................ 3

3.0

TERMS AND DEFINITIONS ..................................................................................................... 3

4.0

REFERENCES ............................................................................................................................... 4

5.0

ROLES AND RESPONSIBILITIES ............................................................................................ 4

6.0

SAFETY .......................................................................................................................................... 5

7.0

GENERAL...................................................................................................................................... 7

8.0

WELDING AND NDT ................................................................................................................ 8

9.0

LIFT RIGGING AND STRUCTURE DETAILS ..................................................................... 10

10.0

PRE‐LIFT ACTIVITIES .............................................................................................................. 10

11.0

JACKET INSTALLATION ........................................................................................................ 11

12.0

SURFER BOAT LANDING INSTALLATION ...................................................................... 18

13.0

OTHER ACTIVITIES ................................................................................................................. 19

14.0

PAINTING AND COATING ................................................................................................... 19

15.0

POST‐INSTALLATION DELIVERABLES ............................................................................. 19


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PURPOSE

This document highlights the Installation Procedures to be used as a guide and defines the sequence of events and installation methodology required for a Wellhead Platform (WHP) Jacket Installation. While this document serves to define the Installation Methodology, there will be activities and vessel movements that will be planned, defined, agreed, and coordinated between the Parties involved and the various Vessel Masters. This will include, but limited to, Vessel stand‐ by locations, Vessel mooring line details, mooring connection etc. 2.0

certain on site not be points,

SCOPE

The scope of this document includes the procedures and reference information required for the safe and efficient installation of the Well Head Platform (WHP) Jacket structure. The major components of this structure will include the Jacket, Piles, Surfer Boat Landing, and any related appurtenances. Installation Activities will only be performed utilizing approved engineering documents, which may include, but not be limited to, Installation Engineering, Installation and Construction Support Procedures, Anchor Patterns, Welding Procedures, Technical Specifications, and Safety Procedures.

3.0 TERMS AND DEFINITIONS Term

Definitio

AHT Company Contractor CSR dGPS DLB DPR FSO HSE JHA MOPU MPI MWS NDT OCM QMS SEWOP SMS SWL TBA Ton TOS UT


Anchor Handling Tug Boat TBA TBA Company Site Representative Differential Global Positioning System Derrick La Bar e Daily Progress Report Floating Storage Offloading Unit Health, Safet , and Environment Job Hazard Anal ses Mobile Offshore Production Unit Magnetic Particle Inspection Marine Warrant Surve or Non‐Destructive Testing Offshore Construction Manager Qualit Mana ement S stem Self‐Elevating Working Offshore Platform Safety Management System Safe Workin Load To Be Assigned Short Ton (US Ton) Top of Steel Ultrasonic Testin

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REFERENCES

4.1 Company‐supplied Drawings and References These are documents to be supplied by the Company to the Contractor. This includes but is not limited to the following; Contract Document, Drawing Index, Well Head Platform Proposed Pipeline Route, Wellhead P/F ‐ Assembly Elevation, Wellhead P/F ‐ Typical Jacket Details, Wellhead P/F ‐ Elevation ‐ Jacket Transport Load‐out, Wellhead P/F ‐ Plan ‐ Jacket Transport Load‐out, Wellhead P/F ‐ Jacket Elevation at Row ‚A‛, Wellhead P/F ‐ Jacket Elevation at Row ‚B‛, Wellhead P/F ‐ Jacket Elevation at Row ‚1‛, Wellhead P/F ‐ Jacket Elevation at Row ‚2‛, Wellhead P/F ‐ Jacket Horizontal Framing ‐ @+12’/‐54’ Elevation, Wellhead P/F ‐ Jacket Horizontal Framing ‐ @‐150’ Elevation, Wellhead P/F ‐ Mud Mat Framing and Details, Wellhead P/F ‐ Jacket Walkway Framing, Wellhead P/F ‐ Jacket Walkway Grating and Handrail Plan, Wellhead P/F ‐ Pile Assembly, Wellhead P/F ‐ Pile Details, Wellhead P/F ‐ Jacket Miscellaneous Details, Wellhead P/F ‐ Surfer Boat Landing ‐ Plans and Elevations, Wellhead P/F ‐ Surfer Boat Landing ‐ Sections and Details, Wellhead P/F ‐ Surfer Boat Landing Clamp ‐ Plan and Details, Wellhead P/F ‐ Jacket Lifting Eye Details, Wellhead P/F ‐ Jacket Trunion Details, Wellhead P/F ‐ Anode Locations and Details, Wellhead P/F ‐ Jacket Flooding Systems and Closures, Wellhead P/F ‐ Riser Assembly Elevations, Wellhead P/F ‐ Riser Spool Details, Wellhead P/F ‐ Riser Support and Riser Clamp Details, Wellhead P/F ‐ Riser Sections and Details, Wellhead P/F ‐ Overboard Line Assembly and Details, Wellhead P/F ‐ Jacket Load‐out Arrangement, Wellhead P/F ‐ Jacket load‐out Details, Wellhead P/F ‐ Load‐out Tie‐down Arrangement, Wellhead P/F ‐ Jacket Load‐out Arrangement, Protective Coatings Specification, Paint Color Codes. 4.2 Contractor‐supplied Documentation and Drawings These are documentations to be supplied to the Company by the Contractor. This include but are not limited to the following; Project Execution Plan, Project HSE Plan, Environmental Management Plan, Emergency Response Plan, Security Bridging Plan, Spill Response Plan, Waste Management Plan, Lifting and Hoisting Plan, Project Quality Plan, SIMOPS/MOPO Plan, Jacket Installation Procedure, Adverse Weather Working Policy, Anchor Handling Procedure, Scaffolding Procedure, Diving Support during Jacket Installation, Debris Clearance Procedure, Radiographic Examination Procedure, Magnetic Particle Examination Procedure, Ultrasonic Examination Procedure, Penetrant Examination Procedure, Pre-Installation Survey Procedure, Fuel Transfer Procedure, Personnel Transfer Procedure, JHA for Jacket Installation, JHA for Marine PreInstallation Survey, JHA for Anchor Handling Operations, JHA for Mooring Operations, JHA fo r Scaffolding Operations, Overall Field Layout.

5.0

ROLES AND RESPONSIBILITIES

5.1

Offshore Construction Manager: 

5.2

The ultimate responsible person offshore in charge of all Offshore Construction Activities.

Field Engineer: Primarily responsible to assist the Offshore Construction Manager with all technical requirements. 





Responsible for coordinating field activities between the Company and Contractor, as well as maintenance of pertinent installation records. Responsible for assuring that the latest revision of approved procedures, drawings, and any other required current documents are available, distributed and in use at all times, as detailed in the Project Distribution Matrix.


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

5.3







6.1

Determination of anchor placement locations, as well as maintenance of all pertinent survey‐related location records and equipment.

Responsible for ensuring that all HSE Procedures are followed and records maintained. Responsible for carrying‐out all the required HSE‐related pre‐inspections, administering safety indoctrination, enforcing safety regulations, and completing the associated inspection documentation.

QA/QC Representative: 

6.0

Responsible for liaising with the Anchor Foreman and Anchor Winch Operators to safely and efficiently position the Barge as per Approved Procedures.

HSE Representative: 

5.7

Responsible for all Barge Positioning Activities.

Chief Surveyor: 

5.6

Responsible for all Deck‐related Activities, Material Handling, and Rigging Activities.

Anchor Foreman: 

5.5

Responsible for ensuring that procedural hold‐points are adhered to, and that all Project requirements are met.

Deck Foreman: 

5.4

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Responsible for ensuring that all quality‐related procedures are followed and records maintained; for performing the required field inspections; and for completing the associated inspection documentation. Monitors compliance with and advising on this Document, Project Specifications and Procedures for all aspects of the Works including, but not limited to, safety, environmental, and quality.

SAFETY General

6.1.1 All personnel involved in the Jacket Installation Operations described by this document will have received at least the minimum required HSE Training per the Contract for the particular operation in which they will participate. This shall include medical certification of fitness and certified Swimming Card, or HUET/BOSIET as applicable. 6.1.2 Prior to commencing Jacket Installation Activities, a detailed Job Hazard Analysis (JHA) will be carried‐out. After all known, suspected, and potential hazards and risks have been identified, the workforce shall be informed accordingly. The JHA shall also identify the control measures that must be in place to eliminate or mitigate the potential hazards and risks surrounding the Operation. The JHA Worksheet will be displayed and available for review in the work area, or at a designated central location.


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6.1.3 Toolbox Talks will be carried‐out daily prior to commencing Work Activities. The topics will be linked to the various work tasks which encompass the Jacket Installation Activities within or immediately around the Work Area. 6.1.4 A Permit To Work (PTW) shall be in place prior to the commencement of any Work Activities. 6.1.5 The workforce shall wear the Personal Protective Equipment (PPE) appropriate for the work being carried‐out as stated in the associated JHA. The workforce shall comply with the Health, Safety, and Environmental requirements of Contractor's HSE Plan. 6.1.6 All major Equipment items, such as Lifting/Rigging Equipment, Marine Equipment, and General Plant shall be made available for inspection by Company prior to use on the Project. Major Marine Equipment items will be subject to on ‐site inspection and acceptance by the Company‐appointed Marine Warranty Surveyor (MWS). 6.1.7 All Operators will be experienced in operating the particular piece of Equipment on which they are employed. Both Operators and Riggers will have the minimum contractual required certification as proof of competency. Adequate taglines, mooring bumpers, and other required protection measures will be provided for all lifts. At no time will any personnel be positioned under a suspended load. 6.1.8 The Offshore Construction Manager (OCM) shall ensure that weather conditions and sea state are suitable for safe Work Operations as per existing and forecasted weather parameters. During all tasks, the Deck Foreman, Tower Operator, and other designated Barge personnel shall maintain watch on weather and sea conditions and report any approaching weather patterns to the OCM. Details of the Barge Weather Warning System are also referenced in Contractor's Adverse Weather Working Policy document. Work Operations will be suspended when conditions are deemed to be unsafe. 6.1.9 Only authorized personnel shall be allowed in the work area. All necessary safety measures, as per Contractor and Company requirements, shall be followed accordingly.

6.2

Safety and Environmental Considerations

All safety‐related inspections, procedures, and documentation will be performed in accordance with the following documents: i. ii. iii. iv. v. 6.3

Safety Management System (SMS). Project HSE Plan. Environmental Management Plan. Emergency Response Plan. Security Bridging Document. JHA Considerations

The following topics shall be included in the JHA: i. ii.

Lift/Rigging Plan. Scaffolding/Temporary Work Platforms.


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iii. Hot Works. iv. Working Over Water/Working at Height. v. Diving Operations. vi. Personnel Transfer. vii. Working Conditions (Weather, Current, Visibility, and General Sea State). viii. Vessel Movements (Project and 3rd Party).

7.0

GENERAL

Company shall free‐issue the Jacket, Piles, Surfer Boat Landing, and all associated appurtenances and permanent materials required for successful installation of the Jacket Structure. Contractor will provide the Company‐approved Construction and Support Vessels for the Installation of the above‐mentioned components. Positioning of the DLB shall be in accordance with Company‐approved Anchor Patterns as referenced herein. 7.1

Communications

Communications between the Contractor’s DLB Barge and other Support Vessels will be by hand‐held and VHF Radios on pre‐established Radio Channels. Radio checks shall be performed prior to the start of the Activities. All radio communications shall be conducted in the English Language. 7.2

Environmental Conditions

Current and projected Tidal Conditions and Weather will be evaluated before and throughout the Jacket Installation Activity. If the Tidal Conditions and/or Current/Forecasted Weather conditions are deemed ‚unsafe‛, the Installation Activity will be postponed until suitable conditions exist. A Table identifying the limiting environmental criteria for making each major lift (i.e. Jacket, Piles, and Surfer Boat Landing) is included herewith. 7.3

Survey System

The primary Survey System used for DLB positioning and vessel tracking will be a differential Global Positioning System (dGPS). The Eiva Positioning and Tug Management Software will be used on a computer to provide real time navigational data, thus allowing the Barge to be positioned at the Company‐approved anchor pattern location for Cluster Installation Activities. The computer system with software will enable a graphical display of the current DLB location and heading data in relation to permanent offshore structures and subsea pipelines. This data is to be displayed in real‐time for the Anchor Operators to position the Barge. The AHT’s in the installation spread shall be equipped with a dGPS Positioning System linked via radio telemetry to the Barge Eiva Tug Management System, and will allow the AHT’s position to be displayed in real‐time on the Barge survey screens. Anchor target information can also be transmitted to the AHT. The Surveyor(s) will be responsible for Company‐ specified location and heading positioning of the DLB at the final Jacket installation location.

7.4 Material Barge Load‐out Structural components, required for offshore installation of the Jacket Structure, have been pre‐ loaded and sea‐fastened on top of the Material Barge. These components include the following: Au th or : AB IS O YE

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Item

1 2 3 4 7.5

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Descriptio

Jacket Surfer Boat Landing P1+P2+P3 Piles (4 Sets Total) A urtenances Barge Arrival in Offshore Field/Nigerian Customs Clearance and Immigration Checks

The Structures and related appurtenances are secured on top of Company‐arranged Material Barge, which is being towed to Nigerian waters with the Tow Vessel. The Material Barge will arrive to the Offshore Field and prepare for Nigerian Customs Clearance and Immigration checks to enable the Structures to be cleared for subsequent installation. 7.6

Jacket Location and Orientation

The Jacket shall be located and orientated according to the provided Field Lay‐out Drawing. Details are as follows: X (Eastin ):

xxxxxx metres

Y (Northing):

xxxxxx metres

Platform North

Rotated xx degrees,

7.7

Installation Equipment

The Jacket will be installed utilizing Contractor ’s DLB Heavy Lift Barge. The DLB is equipped with a pedestal‐mounted Clyde Crane with the following specifications:    

Main Block (Fixed): Main Block (Revolving): Auxiliary Block: Whip Block:

800 Tons @ 76 feet 600 Tons @ 76 feet 150 Tons @ 165 feet 50 Tons @ 245 feet

The Piling Hammer(s) sourced for Pile Driving will be an IHC S‐90 Piling Hammer, an IHC S‐150 Piling Hammer, or equivalent Piling Hammer.

8.0 8.1

WELDING AND NDT Equipment to be Used for the Welding Activities

The following Equipment items may be used during the Welding Activities:  



 





DLB. Welding Machines. Electrode Ovens and Quivers. Power Grinders/Buffers (Electric and/or Pneumatic). Slings and Rigging Equipment (Beam Clamps, Shackles, Chain Falls, Tirfors, Come ‐alongs, etc.). Cutting/Beveling Equipment (Oxy‐Acetylene) and Propane for Pre‐heat. Scaffolding.


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Miscellaneous Hand Tools. QA/QC Tools.

8.2

Welding Consumables

8.2.1 Welding Consumables shall be from recognized and well‐known manufacturers meeting requirements of the approved WPS and PQR. Manufacturer’s Certificates for welding electrodes shall be obtained prior to use. Receipt of electrodes shall be recorded on the Materials Receiving Report accordingly. 8.2.2 All welding electrodes shall be stored, handled, and issued in accordance with the manufacturer’s recommendation. 8.2.3 Unopened electrode containers shall be stored with care, under clean, dry conditions to avoid damage to the electrodes or their containers. Electrodes that are damaged, or have been wet, shall be discarded. No electrodes shall be left lying about the work site. Such electrodes shall be discarded. 8.2.4 ovens.

Welding electrodes mentioned in the relevant WPS shall not be re‐heated or dried in

8.3

Welding Activities

8.3.1 Prior to the start of welding, areas to be welded shall be prepped by power ‐ brushing/grinding as required. 8.3.2 Where required, Propane Heating Torches will be used to apply heat to the weld areas and will assist to remove any moisture that may be present. 8.3.3 Qualified and approved Welders will carry‐out the Welding Activities in accordance with the Company‐approved WPS. 8.3.4 All welding shall be carried‐out under conditions which permit satisfactory workmanship and inspection. Where weather conditions do not permit this, welding shall be carried‐out under a suitable shelter, or postponed until the environmental conditions improve.

8.4

Non‐Destructive

Testing (NDT)

8.4.1 NDT inspection shall only be carried‐out by pre‐mo bilized and Company‐approved Vendor personnel in accordance with Company‐approved NDT Procedures. 8.4.2 NDT personnel shall have current/valid carrying‐out any NDT Work.

Certificates

and be approved prior to

8.4.3 NDT shall consist of Magnetic Particle Inspection (MPI), Ultrasonic (UT), and Radiographic Testing (RT) for completed welds as applicable.

Testing

8.4.4 In the event that a weld must be repaired, the NDT Technician will clearly mark the area of the defect and the area will be arc‐gouged, or ground‐out using a hand‐held Power Au th or : AB IS O YE

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Grinder, to remove the defect. The area will be repaired per the approved Welding Procedure Specification. The repaired weld will be re‐inspected using the appropriate NDT method in Section 8.4.3 above to confirm acceptance of the weld repair.

9.0

LIFT RIGGING AND STRUCTURE DETAILS

The lift rigging for the Jacket Structure will be attached in accordance with the following information: 9.1

Lift Rigging Details

All rigging and lifting implements to be used shall be suitably certified and color‐coded. Details of the Heavy Lift Rigging are attached herewith. 9.2 Cluster Structure Package Weight in Air Data (Less Rigging) Item

Descriptio

1

Jacket

2

Surfer Boat Landing

3

P1+P2+P3 Piles (4 Sets Total)

Est. Weight (Tons)

10.0 PRE‐LIFT ACTIVITIES

The following activities shall be performed before Lifting Operations may commence: 1.

Survey of the Offshore Field will have previously been carried‐out. The Survey Vessel will be set‐up with calibrated Survey Gear and will perform a Pre‐ Installation Marine Survey of the area where the DLB will drop its Anchors for the Installation Anchor Pattern. The Survey Gear will include a Side Scan Sonar Unit, Magnetometer, Echo Sounder, and Gyro. The resulting details will be used to reconfirm Contractor’s proposed Anchor Drop Spots for the Installation Anchor Pattern.

2.

The designated Survey Vessel will carry‐out Survey Runs on a Grid as specified by Contractor’s Chief Surveyor. After completion of the Survey, data will be downloaded and a Survey Chart produced. The Contractor proposed Anchor Drop Spots will be reconfirmed.

3.

Before the DLB proceeds to the Installation location, Contractor will request permission/ clearance from Company to enter into the Field. The DLB will tow to the Jacket Installation location and set‐up on Anchors per the approved Jacket Installation Anchor Pattern. DLB will make all necessary preparations to take delivery of the Material Barge loaded with the Jacket components.

4.

The Material Barge and Tow Vessel will arrive on site and stand‐ by at a pre‐determined location until given clearance to approach DLB. The OCM will confirm when the DLB is ready to receive the Material Barge alongside. Once alongside, the DLB Crew will inspect the Barge and Structures.

5.

The designated service provider will have performed all required Nigerian Customs Clearance and Immigration protocols required to clear the Vessels, Cargo, and Crew into the field for the Midstream Discharge.

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An Underwater Survey shall be carried‐out prior to setting the Jacket on the seabed using either a Mesotech Device, qualified Divers, or a combination thereof. The search radius shall be a minimum 150’ radius from center of proposed Jacket location. The Seabed Survey shall confirm water depth, the presence of debris and/or obstructions, and the verification of seabed profile within the Jacket footprint area. If required, debris shall be removed from the Jacket footprint using the Barge Crane. Note: No Lifting or Scaffolding Operations may take place during Diving Operations, and there shall be no scheduled vessel movements inside a 500m radius from the dive location.

7.

Scaffolding may be erected to install rigging or to access/remove any sea‐fastenings as required. Removal of sea‐fastening may commence at OCM’s discretion; the percentage (%) of sea‐fastening to be removed shall be agreed with the CSR. Note: It is understood that no materials may be removed from the Material Barge until the Nigerian Customs Clearance formalities have been concluded, and until Company has issued the official ‘all clear’ to Contractor that the Field‐related Cargo may now be handled by Contractor.

8.

Any required lift rigging from the Material Barge may be recovered to the deck of DLB.

9.

The Load‐out General Arrangement and Tie‐downs shall be checked to confirm that all is in accordance with the Stowage Plan Drawings. All identified damage will be identified and reported. Sea‐fastening, for each of the lifts, will be jointly identified and inspected with the OCM , CSR, and Company MWS.

10.

Confirm that any/all of the Material Barge hatch/access covers and watertight subdivision openings are secured. 11. Visually inspect the Jacket, Piles, Surfer Boat Landing, and miscellaneous appurtenances to confirm their condition. 12.

Visually inspect the Jacket Flooding System for any damage and missing connections, and confirm the integrity of the Flooding System.

13. Riggers will pre‐install the Jacket side lift rigging from a Work Basket that is controlled by the Man‐ Riding Winch on the Clyde Crane. Rigging shall be secured in places using ¾‛‐1‛ diameter Manilla Rope. 14.

Riggers will also pre‐install the Jacket upending lift rigging from a Work Basket that is controlled by the Man‐Riding Winch on the Clyde Crane. Rigging shall be secured in places using ¾‛‐1‛ diameter Manilla Rope.

15.

When attaching mooring lines to the Jacket, for tethering to DLB, or when using an Attending Tug to assist with Jacket Maneuvering Activities, only ‘soft’ lines/slings shall be used. Where soft lines/slings are used for the Jacket, such rigging shall be attached to the lower side of the upper Jacket Trunions as feasible, or to a Jacket node.

11.0 JACKET INSTALLATION

Before progressing to Jacket Installation tasks, the following must occur:  

Obtain Permit to Work (PTW) authorization from Company. Obtain written acceptance of the Seabed Hazard Survey results from the CSR.

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The following checks and procedures will be performed for the Jacket Lifting/Installation Operations: 1.

Perform JHA/Toolbox Talk shall be performed before the start of Jacket Installation Activities.

2.

The OCM shall review the current and forecasted environmental conditions (weather and sea state) to determine whether or not to continue with, or to suspend, Operations. Same will be discussed with the CSR and Company MWS.

3.

Once the decision has been made by the OCM to proceed with Installation Operations, the Material Barge will be given the order to approach DLB. Details of the arrangement can be found in the Jacket Installation Sequence document. Jacket Pre‐Lift

11.1

4. The Material Barge will be moved into position and secured along the port side of DLB using mooring ropes. Standard Hand‐mooring Marine Procedures will apply. Up to 6 No. Mooring Lines, of 3‛ diameter Marine Rope, may be utilized depending on the actual position of the Material Barge adjacent to DLB. Mooring Lines will be hand‐tightened. Assistant Tugs are maintained on site to provide further assistance if required. Details of the arrangement can be found in Drawing: Jacket Installation Lift Chart . 5. Barge Personnel participating in Lifting Activities shall familiarize themselves with the structures. 6. Riggers will transfer to the Jacket Rigging Platform. The side‐lift rigging will be installed with the assistance of the Clyde Crane in accordance with the Jacket Side Lift Rigging Stowage Plan. If deemed required, wooden protection boards may be placed on the top of the Jacket structure to protect the main Crane Block from hitting the Jacket cross‐members. The exact placement to be agreed between the CSR, Company MWS, and OCM. 7. Riggers will install the upending rigging with the assistance of the Clyde Crane in accordance with Approved Drawing. 8.

The Material Barge may be ballasted, as required, to take into account the removal of the Jacket Structure from the Material Barge.

9.

A team of Welders/Fitters will transfer from DLB to the Material Barge.

10. With favorable environmental conditions confirmed, the OCM shall direct the Welders/Fitters to remove Fifty Percent (50%) of the Jacket sea‐fastening. 11. Repeat Step #2 above. 12. The Clyde Crane will rotate its boom over the Jacket at the pre ‐determined lift radius, and then lower the main hook to the Riggers. The Riggers will install the eyes of the lift rigging assembly onto the main hook of the Crane. The only sea‐fastening to be removed will be those for the Lifting eyes to facilitate connection of the Crane Main Hook. The remaining sea‐fastening (Manilla Rope) will be removed when the Lift Rigging is tensioned by the Clyde Crane. Each lifting sling eye is to be placed onto its own respective prong of the Crane hook, as per Drawing: Jacket Installation Lift Chart. Air Tugger lines will be installed by the Riggers to the upper leg section (straight‐out, not crossed) at this time and will be used to aid in controlling/orientating the Jacket once lifted from the deck of the Material Barge. The exact positioning and length of the Air Tugger lines will be determined on site by the OCM based on site conditions, however, locations such as the Jacket Trunions and the Jacket Nodes will be preferred. A u t h o r:

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13. With the sling eyes and Air Tugger lines attached, the main Crane hook will be raised slightly to remove slack from the lifting slings. The same shall be performed for the Air Tugger Lines. 14. Riggers will attach taglines to each of the lifting slings. 15. Repeat Step #2 above. 16.

At this point, the OCM will direct the Welders/Fitters remaining fifty percent (50%) of Jacket sea‐fastening.

to begin removing

the

17. With the sea‐fastenings removed, the Riggers and Welders/Fitters will return to the DLB. 11.2

Jacket Lift from Material Barge and Rotation from Port to Stern

18. Repeat Step #2 above. 19. At this point, with instruction from the OCM, the Clyde Crane will lift the Jacket from the deck of the Material Barge. The previously installed Crane Tugger Lines will be used to stabilize/control the horizontal movement of the Jacket during the lift. 20. The Attending Tug will move Material Barge out from under the Jacket to a pre‐determined, safe vantage point. 21. The Clyde Crane will lower the Jacket into the water, ensuring that the rigging is kept under tension. 22. For the design calculations, it is been assumed that the Jacket will float. After the Jacket is in the water, the Crane Operator will slack the side ‐lift rigging slightly to verify the extent of Jacket buoyancy and verify the weight reading on his LMI (Load Moment Indicator). In the event that the Jacket Upending process needs to be aborted, the Jacket will be recovered back to the Material Barge. Should other options need to be considered, then such options will be reviewed agreed between Contractor, Company, and the MWS. 23. Jacket upending will be performed using the Main Hook on the Clyde Crane. The Rigging Crew will attach soft lines onto the Jacket at the Jacket trunions, or Jacket Nodes, and will secure the Jacket to the side of DLB. Bumpers will be located in between the DLB and the Jacket Structure. 24.

Riggers will be transferred to the side‐lift Rigging Platform on the Jacket. The Clyde Crane Main Hook will slack the side‐lift rigging to allow the Riggers to remove the Rigging from the Main Hook. The Manitowoc Deck Crane will be used to assist in the removal of the side lift slings closest to DLB‐ 332. The Clyde Crane will be used to remove the side lift slings from the opposite side of the Jacket. Care shall be taken so that the slings do not come into contact with the Jacket Flooding System.

25. Riggers will be transferred to the upending rigging platform on the Jacket. The Clyde Crane will lower the Main Hook to the Riggers to allow the upending lifting slings to be attached to the Main Hook. 11.3

Jacket Upending and Orientation

26. Repeat Step #2 above, then proceed to the next step. 27. The Jacket will be upended using the Clyde Crane Main Block in accordance with an approved drawing. A u t h o r:

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28.

A reference point will be made on the Rigging/Jacket for ease of identification by the Crane Operator so that the clearance of the Jacket to the seabed can be monitored during the Upending Operation.

29.

Once the Jacket has been lifted upright, the Jacket will be tethered to the port side of DLB. The tethers will consist of custom length marine ropes so that the Jacket distance off the Barge stern will be known and controlled during final Jacket positioning.

30.

With the Jacket suspended from the Main Hook, the DLB will adjust its position towards the installation location using its Anchor Winches, and the Clyde Crane will lower the Jacket onto the natural sea bottom.

31.

Before Piling may commence, the Contractor Chief Surveyor, OCM, and Field Engineer will verify that the as‐designed Jacket location and orientation is in accordance with provided approved Drawing and the Company‐provided parameters in the Table below.

Jacket Data

Nigerian Mid‐Belt Coordinates: Jacket Center Location Data

X= Y=

MINNA CLARKE 1880. MOD:

Water De th: Jacket Top Brace (feet): Structure Elevations Jacket Bottom Brace (feet): To of Jacket Elevation (feet): Jacket orientation must be with (+/‐) 5 degrees of the prescribed orientation. The Jacket shall be leveled to within Two (2) inches across any diagonal. Jacket leveling methodology is described in hereafter. 32. With the Jacket securely resting on the seabed, and within installation tolerance as detailed below, Riggers will be deployed by Work Basket to remove the lift rigging and any Tugger Lines utilized. 33. All flood prevention caps shall then be removed and the Jacket will be flooded. Welding of Pile Lifting Pad‐eyes/Stops

11.4

Once the Jacket has been removed from the Material Barge, Contractor will have clear and unhindered access to the Piles to work on the Lifting Pad‐eyes/Pile Stops. It is noted that sea‐ fastening will only be removed on those Piles that are being handled/worked on. 11.5

Pile Upending and Driving

Once the Jacket has been lifted, set in the water, upended, rotated over its resting position, and set in place, Pile Installation Operations will commence. The Pile Upending Procedure is as follows: 1.

A JHA/Toolbox Talk will be performed before commencing Pile Driving Activities.

2.

The Material Barge will be positioned along the port side of DLB in preparation to receive and upend the P1 Piles.

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3.

The OCM will review the current and forecasted environmental conditions (weather and sea state) to determine whether or not to continue with, or to suspend, Pile Installation Operations. Same will be discussed with the CSR and MWS.

4.

A gangway shall be installed between the DLB and the Jacket Material Barge.

5. 6.

Riggers will set‐up scaffolding as may be required for Pile Installation Operations. Riggers will transfer from DLB to the Material Barge.

7.

The Pile sea‐fastening clips will be removed at this time if not done so already.

8.

Riggers will connect Pile lifting rigging to a P1 Pile. A detailed Rigging Plan shall be provided by the Contractor.

9.

The Clyde Crane will lower the auxiliary block at the design radius, and Riggers will connect the P1 rigging to the Crane hook.

11.6

P1 Pile Installation

10. The P1 Pile is upended by taking‐up wire on the auxiliary block while revolving. It should be ensured that the shackles connected to the P1 Lifting Pad‐eyes stay parallel to the P1 Pile during the initial phase of the upending. Pile dragging shall be avoided by closely monitoring the take‐up and Crane tip motion. A ‘belly line’ will be placed midway on the Pile via the Deck Crane. This belly line will aid in stabilizing the Pile if the OPI Superintendent determines it is required due to environmental conditions being encountered on site. Sea‐fastening will only be removed on those Piles that are being worked. 11.

Once the P1 Pile is upended, the Clyde Crane will rotate the Pile over the Jacket, and the Pile tip will be installed into its respective Jacket leg opening. The OCM will determine the P1 Pile sequence based on the attitude of the Jacket after initial placement.

12.

If the P1 Pile does not break/penetrate the bladder in the Jacket leg using its own self‐weight, the option of lifting and lowering the Pile again shall be available. The bladder is designed to collapse under the weight of the P1 Pile Section.

13. At the OCM’s discretion, Riggers will be transferred to the Jacket. 14.

If the P1 Pile has self‐penetrated up to the Pile Stops, then the Riggers will disconnect the P1 rigging and the operation will repeat starting at Step 7 above, until all P1 Piles have been inserted. Note: If a P1 Pile did not penetrate to the Pile Stops, the OCM will decide to either place the Hammer on top of the Pile in preparation to commence Piling Operations, or to leave it at the current penetration depth and just retrieve the rigging (as feasible). Once the Pile lift rigging has been removed, Riggers shall return to the DLB. If the Pile Hammer option is chosen, the blow count per foot shall be noted and recorded, as well as start and stop times. Contractor has the option to use an S‐90 or S‐150 Piling Hammer. Hammer specifications for each Hammer shall be attached herewith. In establishing the Pile Driving refusal criteria, the recommendations of the Pile Hammer Manufacturer shall be considered.

15.

If the P1 Pile has to be driven to depth, the OCM, or his delegate, will direct removal of the Pile Hammer.

16. Once all P1 Piles have been installed into their respective Jacket Legs, and either driven to depth or are resting on their stops after self‐penetration, the P2 Piles can be installed. 17. At this point, temporary work platforms are to be erected around each Jacket Leg top to A u t h o r:

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facilitate Pile cut‐off and welding of the P2 Pile sections. 18.

In case the P1 Pile top has been damaged or deformed during Handling or Hammering Operations, or if there was damage that is pre ‐existing, Fitters will flame‐cut a shackle pin hole into the top of the P1 Pile section for subsequent removal.

19. Fitters will then perform a circumferential cut 500mm from the top of Pile leaving 1 to 2 inches attached. Next, a shackle is to be installed into the previously cut hole. The Clyde Crane block will then be lowered and attached to the shackle via a sling. The Clyde Crane will then remove the cut‐off Pile section to the Material Barge, or DLB‐332, at the discretion of the OCM. After the P1 Piles have been cut and re‐ beveled, the new bevel will be subjected to both UT and MPI. 20. With the required P1 Pile sections installed, and their respective top bevels prepared and tested as stated in Step 20 above, stabbing of the ‚P2‛ Piles may commence. 11.7

21.


The OCM will decide as to whether or not Pile Stops will be installed on the P2 Piles based on the results of the Piling Operations thus far. Same will be discussed with the CSR and MWS.

22. Riggers may disconnect the spring lines from the Jacket, at the discretion of the OCM. 23.

The OCM will review the current and forecasted environmental conditions (weather and sea state) to determine whether or not to continue with, or to suspend, Pile Installation Operations. Same will be discussed with the CSR and MWS.

24.

The Clyde Crane will lower the auxiliary block to the Material Barge at the design radius, and Riggers will connect the auxiliary hook to the Pile rigging.

25. The P2 Pile will be upended by lifting the Clyde Crane hook. 26. In general, the four P2 Piles may be stabbed and welded one ‐at‐a‐time. However, the OCM may opt to stab more than one P2 Pile before commencing the Welding Activity. This will be at the OCM’s discretion. 27. The Clyde Crane will rotate and set the first P2 Pile onto the pre ‐determined P1 Pile. The OCM will decide on the P2 Pile installation sequence and timing. 28. Riggers and Welders/Fitters will transfer from DLB to the Jacket. 29. With the P2 Pile stabbed inside the P1 Pile, the two Pile sections will be welded together per the approved Welding Procedure. The weld shall be inspected visually and in accordance with approved NDT Procedures. 30. The Clyde Crane will take‐up tension on the combined P2 + P1 section, and the P1 Pile stops will be removed and recovered back to DLB. 31. The Clyde Crane will lower the rigging down and Riggers will disconnect the rigging. Riggers will be working from a Work Basket from the Clyde Crane Man‐Riding Tugger. 32. The Clyde Crane will transfer the rigging back to the Material Barge for the next lift. 33. The Clyde Crane will rotate over to the Piling Hammer. 34. Riggers will connect the Piling Hammer rigging to the Clyde Crane hook. 35. The Piling Hammer will be lifted and set on top of the first P2 Pile. 36.

The Piling Hammer will be engaged. The blow count per foot shall be noted and recorded, as well as start and stop times.

37. Pile Driving shall continue until the P2 Pile is at the required penetration depth. A u t h o r:

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38. Once the required P2 penetration has been achieved, the Piling Hammer will disengage and the Clyde Crane will remove the Piling Hammer and lower it back to the Barge deck. 39. The Piling Hammer rigging will be disconnected. 40. The Clyde Crane will rotate over to the Material Barge and lower auxiliary block such that the rigging for the next P2 Pile can be connected. This process shall continue for all remaining P2 Piles. 41. Preliminary leveling of the Jacket may be performed at this stage as feasible, and the Jacket may be temporarily ‘dogged‐off’ to the Piles as required. 42. If spring lines are still connected to the Jacket, same shall be removed at the discretion of the OCM. Note: A situation may occur where it is not possible to stab all P2 Piles at once, and due to conditions encountered on site, the OCM may be required to Drive the first two P1+P2 Pile Sections before any further P2 Pile Sections can be installed into the P1 Pile Sections. In any case, the best way forward shall be determined by the OCM. 11.8


43. The P3 Piles shall be installed in the same manner as the P2 Piles, following Steps 22 through 42. 44. In general, the four P3 Piles may be stabbed and welded one‐at‐a‐time. However, the OCM may opt to stab more than one P3 Pile before commencing the Welding Activity. This will be at the OPI Superintenden t’s discretion. 45.

P3 Piles will be driven to the design penetration depth. In the event that Pile Driving Operations do not reach the design penetration for any of the P3 Piles, the following refusal criteria shall be utilized: a) When driving resistance exceeds 300 blows/ft for (5) consecutive feet, refusal has been achieved. b) When driving resistance exceeds 500 blows/ft for (1) foot, refusal has been achieved.

46. With all four Pile strings driven, Jacket Leveling shall commence as required. Jacket Leveling verification shall be performed using the water level method. For the water level method, a clear, flexible hose of adequate length and diameter (i.e. 1 ‛ Diam. x 20 m Long) will be filled with water. All air bubbles/pockets shall be removed. This shall be verified by tapping/shaking the hose, then by holding the two ends together next to one another and confirming that the water levels are equal. The water‐filled hose will be long enough to reach between two Jacket Legs at a time. 47. Fitters will be positioned at two Jacket Legs using the existing rigging platforms or temporary platforms. Each Fitter will hold one end of the water‐filled hose at the designated reference point and will make a reference mark on the Jacket Legs at the water line level. The distance between this reference mark and the top of the Jacket Leg will be measured. The same process will be repeated for all Jacket Legs and the measurements will be compared to one another. Equal measurements means that the Jacket is level. 11.9

Final Leveling and Crown Shim Installation

48. After identifying that the Jacket requires leveling, the following method shall be utilized: A u t h o r:

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Jacks will be attached between the Pile and the Jacket on previously installed installation aids (pad‐eyes). Jacks will be activated until the desired level is achieved. Crown Shims will be placed and welded down in place (minimum of 50%) before releasing the Jacks. Retrieve Jacks and complete the Crown Shim welding. Remove Installation Aids.

49. Crown Shims shall be installed and welded‐out to the Piles Welding shall be in accordance with the approved Welding Procedure. Crown Shims must be welded out a minimum of Fifty percent (50%) prior to setting the Cellar Deck. All welds shall be inspected visually and in accordance with approved NDT Procedures. 50. With all four (4) Pile sections driven and welded‐out to the Jacket, scaffolding shall then be erected to facilitate Pile cut‐off. .

51. The final cut‐off locations/elevations are to be marked referencing the design MLW on all four Piles. The Piles are to be cut‐off at these marks and a temporary cover placed on top to prevent the ingress of water. 52. Miscellaneous Jacket items that have been shipped loose, such as Grating, Handrails, Stairs, etc. may be installed at this time at the OCM’s discretion (to the extent that they are meanwhile work and not interfering with other ongoing activities). 12.0

SURFER BOAT LANDING INSTALLATION

The Surfer Boat Landing will be installed at the OCM’s discretion (i.e. immediately after Jacket Installation) in accordance with the following Installation Steps: 1. A JHA/Toolbox Talk will be performed before commencing Surfer Boat Landing Installation Activities. 2.

The OCM will review the current and forecasted environmental conditions (weather and sea state) to determine whether or not to continue with, or to suspend, Installation Operations. Same will be discussed with the CSR and Company MWS.

3.

The Material Barge may be relocated as required.

4.

Riggers and Welders/Fitters will be transferred from DLB to the Material Barge.

5.

Riggers on DLB will attach appropriate lift rigging to the Clyde Crane hook.

6.

Repeat Step #2 above, then proceed to the next step.

7.

The Clyde Crane will rotate to the design lifting radius and will lower the auxiliary hook and rigging.

8.

Riggers on the Material Barge will attach lift rigging to the Surfer Boat Landing, as well as taglines to each of the slings. At this time, Riggers may also install Air Tugger line(s) to the Surfer Boat Landing to help stabilize the structure during the lift (if deemed necessary by the OCM). The Crane Hook will then be slacked and laid‐down on the deck of the Material Barge.

9.

Repeat Step #2 above, then proceed to the next step.

10. Welders/Fitters will remove the Surfer Boat Landing sea‐fastening. 11. The Clyde Crane will lift the Surfer Boat Landing from the deck of the Material Barge. 12. The Clyde Crane will rotate the Surfer Boat Landing over the appropriate position on the Jacket. A u t h o r:

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13. The Clyde Crane will lower the Surfer Boat Landing into place. 14.

The Surfer Boat Landing will be installed directly onto one of the Jacket Legs by way of a single bolted clamp as per Company‐supplied. The OCM may opt to send Riggers to the Jacket to pre‐install rigging which can be used to receive and maneuver the Surfer Boat Landing into place to facilitate the installation of the subsea Surfer Boat Landing Jacket Leg Clamp by the Divers.

15. Once the Surfer Boat Landing is in place and safely supported, Divers will be launched to complete the bolt‐up of the Surfer Boat Landing Jacket Leg Clamp using Company‐provided mounting studs/bolts. 16.

When the Surfer Boat Landing has been secured in place, the Crane will slack the rigging, and the rigging will be released by the Riggers and recovered back to the DLB deck.

17.

If any other rigging was used to receive and maneuver the Surfer Boat landing into final position, this rigging will be released by the Riggers and recovered back to the DLB deck.

13.0

OTHER ACTIVITIES

Other work to be performed by OPI includes the installation, ho ok‐up, and commissioning of the Navigational Aids (Lanterns) and Fog Horn. Such Equipment items will be installed as per AFREN‐supplied information. 14.0

PAINTING AND COATING

If during the Jacket Installation and Welding Activities the coated (painted) areas become affected during the Installation Process, same will be prepared and coated in accordance with Company's Protective Coatings Specifications and Paint Color Codes. Contractor may carry‐out the Repair Work at any time during the Installation Activities as determined by the OCM.

15.0

POST‐INSTALLATION

DELIVERABLES

Pertinent installation records, including the Pile Driving Report, will be prepared and furnished to Company in an As‐Built Dossier.

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TECHNICAL PROCEDURE FOR JACKET INSTALLATION.pdf

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