Simplified Motion Response Calculations

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Installation Procedure

CAN Suction Anchor Nodes

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Change(s) since last revision Rev. no Date Section Page Reason / Changes

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Table of Contents 1. INTRODUCTION ...................................................................................................................................... 5

1.1 SCOPE OF DOCUMENT ............................................................................................................... 5 1.2 OBJECTIVES ................................................................................................................................. 5 1.3 RESPONSIBILITIES ...................................................................................................................... 6 1.4 PARTIES INVOLVED IN OPERATION .......................................................................................... 6 1.5 ABBREVIATIONS .......................................................................................................................... 6 1.6 DEFINITIONS................................................................................................................................. 7 1.7 REFERENCES ............................................................................................................................... 7

2. SAFETY ................................................................................................................................................... 8

2.1 GENERAL ...................................................................................................................................... 8 2.2 SAFE JOB ANALYSIS (SJA) ......................................................................................................... 8 2.3 WORK PERMIT SYSTEM .............................................................................................................. 8 2.4 COMMUNICATION ........................................................................................................................ 9 2.5 TOOLBOX TALK ............................................................................................................................ 9 2.6 MANAGEMENT OF CHANGE ....................................................................................................... 9 2.7 TASK PLAN.................................................................................................................................... 9

3. PROCEDURE ......................................................................................................................................... 10

3.1 DESCRIPTION OF SCOPE OF WORK ....................................................................................... 10 3.2 DECK LAYOUT ............................................................................................................................ 10 3.3 LIFT PLANS ................................................................................................................................. 10 3.4 DEPLOYMENT ANALYSIS .......................................................................................................... 11 3.5 WORK COORDINATION ............................................................................................................. 11 3.6 OFFSHORE COMMUNICATION ................................................................................................. 11 3.7 VESSEL DATA ............................................................................................................................. 12

3.7.1 Skandi Constructor (fill inn) .............................................................................................. 12 3.8 ROV DATA ................................................................................................................................... 13

3.8.1 Triton XL 14 2000 MSW (ROV-1) ...................................................................................... 13 3.8.2 Hydra Millennium Plus 3000 MSW (ROV-2) ...................................................................... 13

3.9 LOCATION DATA ........................................................................................................................ 13 3.10 CAN ORIENTATION REQUIREMENTS ...................................................................................... 15 3.11 CONTINGENCY ........................................................................................................................... 15

3.11.1 Drive off / Drift off ............................................................................................................... 15 4. OPERATIONS ........................................................................................................................................ 16

4.1 TASK PLAN FOR INSTALLATION OF CAN ............................................................................... 16

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5. APPENDICIES ....................................................................................................................................... 22 5.1 APPENDIX A VESSEL DECK LAYOUT ................................................................................... 22 5.2 APPENDIX B LIFT PLANS ....................................................................................................... 24 5.3 APPENDIX C- LIFTING ARRANGEMENT .................................................................................. 27 5.4 APPENDIX D DEPLOYMENT ANALYSIS ................................................................................ 29 5.5 APPENDIX E - CAN ..................................................................................................................... 56 5.6 APPENDIX F LIDS .................................................................................................................... 58

5.6.1 Pump Lid ............................................................................................................................ 58 5.6.2 AFT Flange lid .................................................................................................................... 58 5.6.3 Corrosion plugs .................................................................................................................. 59

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1. INTRODUCTION

DOF S ubsea N orway A S has been co ntracted by Det norske Oljeselskap A SA ( via Maritime Logistics Services AS) to install two CAN units on the seabed at the Jette field in the North Sea, as support for drilling operations and as foundation for x-mas trees.

Figure 1: Area overview of location of the Jette field.

1.1 SCOPE OF DOCUMENT The sco pe o f this document i s to desc ribe t he ex ecution of t he i nstallation o f t wo C AN units including related services at the Jette locations.

1.2 OBJECTIVES The objective of this document is to describe the procedural steps for all parties involved, to ensure a safe and effective operation, with no injuries to personnel or damage to equipment.

Jette

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1.3 RESPONSIBILITIES The Project Engineer is responsible for issuing and maintaining this procedure and the Project Manager is responsible for approving the procedure. Once t his document i s approved i t w ill be del ivered t o t he r elevant v essel and t he Offshore Manager becomes the responsible person during the offshore operations. The w hole pr oject t eam sh all m ake t hemselves familiar w ith t he co ntents and i mplement the requirements narrated in this document.

1.4 PARTIES INVOLVED IN OPERATION Company Involvement Det norske Oljeselskap Operating Oil-Company NeoDrill AS CAN equipment supplier and Project Coordinator DOF Subsea Operator o f S kandi C onstructor and one R OV-

system onboard Oceaneering Supplier/Operator of one ROV-system onboard iSurvey Positioning and surveying services for the CAN

installation. Geograf QA Positioning

1.5 ABBREVIATIONS Abbreviation Description CAN Conductor Anchor Node (Suction anchor type well foundation) DF Deck Foreman DN Det norske Oljeselskap ASA DSN DOF Subsea Norway AS HS Significant Wave Height HSE Health Safety and Environment HSS Health Safety and Security IFC Issued for construction kg Kilogram m Metres m/s Metres /second Max Maximum MHT Module Handling Tower Min Minimum ND NeoDrill OCR Offshore Client Representative OM Offshore Manager PPE Personal Protective Equipment ROV Remotely Operated Vehicle ROV-1 Dredging ROV ROV-2 Pumping ROV SJA Safe Job Analysis SOB Safety Observation SS Shift Supervisor

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TBC To be confirmed TBT Toolbox Talk UHF Ultra High Frequency VHF Very High Frequency

1.6 DEFINITIONS The terms used in this document are in accordance with the definitions g iven in t he Contract or referenced in the Contractors Project HSE Plan, ref. /6/ and Project Quality Plan, ref. /7/. Some specific terms are also defined directly in the text of this document. In case of conflict between the definitions given in the different documents, the definitions given in the Contract shall prevail.

1.7 REFERENCES Ref. no.

Document no. Document title

/1/ DG-PY-0002 Health, Safety and Security (HSS) Policy /2/ DSA-HS-TP-0013 Safety Observation (SOB) /3/ DSA-HS-TP-0011 Safe Job Analysis (SJA) Form /4/ DSA-HS-GL-0002 Risk Management Guideline /5/ SMS04.012 Safety Procedures Manual /6/ 600205-PJ-S14-12-0001 Project HSE Plan /7/ 600205-PJ-Q14-12-0001 Project Quality Plan /8/ DSA-QA-ST-0009 Offshore Management of Change Procedure /9/ DSA-QA-TP-0020 Change Request Form /10/ 600205-PJ-O03-12-0001 Mobilisation and Demobilisation Procedure

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2. SAFETY

2.1 GENERAL All per sonnel i nvolved i n operation are responsible f or w orking a ccording t o C ontractors HSS Policy, ref. /1/, Project HSE Plan, ref. /6/ and Risk Management Guideline, ref. /4/. All personnel onboard operate within rules regarding Safety Reporting. Contractor has systems for registering Safety Observations, ref. /2/. The form is present onboard the vessel. Anyone observing an unsafe act or breach of procedure is obliged and enco uraged to report the incident. The filled out form shall be returned in a designated box. If preferred the observer can report anonymously. Safety Observations can be made positively for good HSE actions as well as negative. DSN has implemented Docmap as our analysis tool for unwanted incidents and reports. Any person involved in the operation, is authorised to stop the operation if he/she sees an unsafe act, or does not feel sufficiently familiar with his/her tasks. If the operation is halted, the reason for stopping must be r ectified be fore t he oper ation ca n r esume. The oper ation ca n onl y be st arted again by the person responsible for the step in the operation that was stopped.

***IMPORTANT SAFETY NOTE*** Proper PPE to be used during operation, including safety glasses and boiler suit

when on deck or in ROV hangar When working in an area not properly secured from falling into the sea, life vest and

safety harness shall be utilised. All lifting certificates must be checked towards all lifting equipment prior to any

lifting operations. Gangway shall be placed in safe area and always be used when entering quay or

vessel

2.2 SAFE JOB ANALYSIS (SJA) Prior to t he s tart o f operation a sa fe job anal ysis (SJA) w ill be per formed f or al l oper ations that have a r isk element. This process shall address the task, the location, tools to be used, personnel involved and any simultaneous activities. A representative for all parties involved in the work will attend the SJA. All SJAs shall be recorded. The Offshore Manager is responsible for performing the SJA. For further details see ref. /3/. NOTE: Prior to any operation regarded as critical and for any operation that is not clearly described in a procedure requires a SJA to be held.

2.3 WORK PERMIT SYSTEM Certain potentially hazardous work on board the vessel requires an approved Work Permit. This can be obtained from the vessel Duty Officer, according to Safety Procedures Manual, ref. /5/. Welding or other hot work on board may require fire watch. This will be defined on the Permit to Work Form.

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2.4 COMMUNICATION The vessel is equipped with a ClearCom-system with stations located in bridge, online, ROV control, crane and deck. In addition the OCR and OM have stations available. All communication will be in English, with the ClearCom-system as primary for ROV controlled operations and VHF/UHF communication as primary for deck controlled operations. VHF/UHF is available for bridge, Online, ROV control, crane and deck. Onboard communication lines are as described in the Project Quality Plan, ref. /7/.

2.5 TOOLBOX TALK A SJA will be hel d prior to the operation with all parties involved. Information regarding the scope of work, vessel work permit system and responsibility for different activities will be clarified. Prior to field work, a toolbox meeting will be hel d including a familiarisation to the SJA. All parties involved must participate in the meeting. In addition a toolbox meeting shall be ca lled for prior to any operation regarded as critical and f or any operation that is not clearly described in a procedure.

2.6 MANAGEMENT OF CHANGE When a requirement for change arises offshore the intent of the change shall be communicated between the Offshore Manager and the Project Manager, ref. /8/. The type of change may be, but not limited to, the following:

Change from IFC Project Procedures or Documentation. Change from Standard Company Procedures and Routines. Changes to the sequence of work offshore. Changes and modifications to any Project or Vessel Equipment. Changes in Weather Limitations. Client initiated Changes or Requests.

Upon identification of a change, it will be necessary for the personnel involved to plan the change to ensure that all necessary information is considered when deciding how to proceed. Furthermore, a necessary risk assessment will be conducted as part of the management of change. The proposed change shall be recorded on Change Request form (CR) by the Offshore Manager, ref. /9/.

2.7 TASK PLAN The t ask plan i n appendi x A out lines the pl anned act ivities and t he r esponsible personnel for supervising each activity during operation. In addition senior department operators are responsible to ensure that equipment and consumables are mobilised according to department procedures.

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3. PROCEDURE

3.1 DESCRIPTION OF SCOPE OF WORK The CAN units will be i nstalled at the Jette f ield i n B lock 25 i n t he North Sea, using t he vessel Skandi Constructor, including necessary ROV equipment and use of subsea basket. Upon arrival at the work site ROV dredging operation will be performed to facilitate a deeper CAN penetration. When dredging of the first area is completed, further activities will be deci ded by the weather condition development, as follows:

1. Acceptable CAN installation conditions: Proceed with CAN # 1 installation; 2. Non-acceptable CAN conditions: Perform CAN # 2 location dredging operations if ROV

conditions OK; 3. If 1. above is commenced, attempt dredging of CAN # 2 site whilst installing CAN # 1.; 4. If si multaneous CAN i nstallation and dr edging proves unpractical, su spend C AN # 2

dredging until CAN # 1 installation is complete. Briefly summarised, the CAN installation project sequence will be as follows:

Vessel mobilisation for CAN installation at Dusavik; Steaming to location; Dredging of CAN installation site (#1, or #1and # 2); Installation of two CAN structures; Return voyage to shore; Demobilisation at Dusavik.

3.2 INSTALLATION WINDOW The required installation weather window for installing a single CAN is divided into two:

1. Overboarding and deployment of CAN = 4 hours; 2. Landing and penetration of CAN = 20 hours.

The limiting factor for overboarding and deployment of the CAN will be safe deck handling as well as slack slings when t he C AN i s lowered t hrough the sp lash z one. A depl oyment anal ysis is included in Appendix D. The limiting factor for landing and penetration of the CAN will be the crane AHC and CT modes acceleration capacity. Indicative limitation is 3.0-3.5 meters depending on the wave period.

3.3 DECK LAYOUT Appendix A - Deck layout, outlines the planned deck arrangement.

3.4 LIFT PLANS Appendix B Lift Plan for Deployment of CAN, explains the deployment of CANs. Appendix C CAN Lift Rigging, gives the lift rigging sketch of the CANs.

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3.5 DEPLOYMENT ANALYSIS Appendix D Analysis of deployment of CANs from Skandi Constructor.

3.6 WORK COORDINATION The Subcontractor Supervisor & OM are responsible for initiating any corrective action if possible to ensure the efficiency is maintained.

3.7 OFFSHORE COMMUNICATION The operations room, on A-deck will function as control room for the CAN Installation Operation and will be manned by DOF Subseas Shift Supervisor. The Shift Supervisor will be the single point of command during all subsea operations with the following exceptions:

Deck Foreman will be the single point of command during all deck lifting and overboarding operations;

Shift Supervisor may delegate the responsibility of specific subsea tasks to other competent person when this is found desirable for the project.

Figure 2: Organogram for communication offshore during operation.

The OPS central is located in the survey room, adjacent to the ROV control room. The OPS central is always manned during operation. Before commencement of CAN installation operations, the following testing of communication shall be carried out:

Clear com system, (primary communication system) UHF, (secondary communication system) DP Alert System (inform all alarm positions first)

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PA system

The Clear-com system allows open communication via fixed cable between following stations;

OPS Central Bridge Maine Crane Survey personnel ROV-unit Clients Office DOF Superintendent Office

During operations, all operators on deck will have head-set UHFs , and stationary UHFs will in addition be located on following stations;

OPS Central, (DOF supervisor work station) Bridge ROV-unit SH office DOF Superintendent Office

3.8 VESSEL DATA 3.8.1 Skandi Constructor The main properties of Skandi Constructor are included in Table 3-2 below. Property Unit Value Length, overall m 120.2 Breadth, moulded m 25.0 Max draft m 7.0 Gross tonnage Te 16 562 Net tonnage Te 4 969 DWT at 8.8m draft Te 10 043 Free deck area m2 1 885 Deck strength Te/m2 20.0 Height of port cargo rail m 3.2 Service speed knots 12.5 Max. speed knots 14.0 Main crane max subsea lift capacity @ R=12m Te 150 Port crane lift capacity @ R=15m Te 15 MHS winch max subsea lift capacity Te 140

Table 3-2: Main properties of Skandi Constructor.

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3.9 ROV DATA 3.9.1 Triton XL 14 2000 MSW (ROV-1) Dredging pump pre-installed and function tested. 3.9.2 Hydra Millennium Plus 3000 MSW (ROV-2) ZIP pump pre-installed and f unction tested ( for handl ing the Pump l id and sucking in t he CAN units).

3.10 LOCATION DATA Jette WH 1 / CAN #1 UTM Coordinates (UTM 31)

464 171,03 mE 6 585 335,61 mN

Longitude: Latitude:

2 22' 8.371''E (ED50) 59 24' 13.561''N (ED50)

Water depth: 127.0 +/-1.0m Table 1: Location of CAN #1 according to Det Norske's separate Installation procedure. Jette WH 2 / CAN #2 UTM Coordinates (UTM 31)

464 167,89 mE 6 585 299,74 mN

Longitude: Latitude:

2 22' 8.194''E (ED50) 59 24' 12.400''N (ED50)

Water depth: 127.0 +/-1.0m Table 2: Location of CAN #2 according to Det Norske's separate Installation Procedure. Positioning tolerances for the CANs are 2.0m. However, position of CAN #2 should be adjusted accordingly should CAN #1 be installed at the southerly limit of the positioning tolerance. CAN repositioning: If CAN #1 must be moved, this shall be done in a direction of 220 degrees from 0 to 10m. CAN #2 shall then be repositioned accordingly to keep the same internal configuration. If CAN #2 must be moved, this shall be done in a direction of 220 degrees from 0 to 10m. CAN #1 will then remain in its position.

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The two CAN locations are located 36m apart as shown in Figure 3 below:

Figure 3: Well and CAN Locations according to Det Norske's separate Installation Procedure.

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3.11 CAN ORIENTATION REQUIREMENTS CAN Orientation: The axis running through the two suction lids on the CAN is defined as the Heading of the CAN. Background: The Xmas tree (and Flow base) will be oriented with a heading of 220 degrees (similar to planned rig heading). To avoid possible interference between the CAN Pump flange Corrosion Caps and the Flow Base guideposts, the two i tems will be se parated a s far as possi ble by a selected, opt imised C AN heading. The CAN should therefore be oriented with the lids 90 degrees off the XT heading. The CAN heading should be:

i) 130 degrees +/- 20 degrees (Optimum heading 1) ii) 310 degrees +/- 20 degrees (Optimum heading 2) iii) 40 degrees +/- 20 degrees (Alternative heading 1) iv) 220 degrees +/- 20 degrees (Alternative heading 2)

3.12 CONTINGENCY 3.12.1 Weather Standby The required weather window for the installation of one single CAN is 4 + 20 hours. None of the operations will commence unless the required weather windows have been forecasted. During the installation the weather will be continuously monitored. In case of weather deteriorating the oper ation w ill be abor ted, r eversed o r continue unt il weather conditions no l onger a re found acceptable and the operation have reached survival condition. The decision is to be t aken by the Vessel Master, Offshore Manager, Warranty Surveyor and Client. 3.12.2 DP run off Skandi Constructor is certified as a DP-class III vessel. Since the vessel systems have contingency built-in and ar e p roperly m aintained a total l oss o f posi tioning ca pability, or m anoeuvrability i s considered v ery un likely. H owever, em ergency abandonm ent of the C AN will ha ve t o be considered if the vessel cannot be brought back under control, or the vessel is put at risk. 3.12.3 Drive off / Drift off To mitigate the risks related to a potential Drive off / Drift off situation, it is required to review and verify the capacities of the CAN lifting system. Especially the weakest connection needs to be placed near the sea bed to avoid unintended risky situations to take place above deck. 3.12.4 ROV Failure The vessel is equipped with two WROV systems and a breakdown of both WROV systems simultaneous is unlikely. Both WROV systems can be f itted with the same tooling. All work can be carried out using one WROV only, however, this will slow down the operation as the ROV has to berecovered to deck for changing the larger ROV equipment required for some of for the different tasks.

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4. OPERATIONS

4.1 TASK PLAN FOR INSTALLATION OF CAN

Installation of CAN Task description and # :

Skandi Constructor Jette Development Work site:

600205 Project:

This task plan describes the CAN installation. Task objective:

Summary of tasks:

1. SJA and TBT completed.

2. Initial Status 3. Preparatory work and Deployment 4. Visual check of all rigging. 5. Removal of sea fastening 6. Deployment of CAN 7. Installation of CAN

Max. wind speed (crane) = 15m/s (30 knots). Operational limitations:

Max HS (installation) = reference is made to the deployment analysis included in Appendix D. Safe deck handling shall always be considered when determining the operational limitations.

Originator: Andreas Morland Originator and approver:

Approver: Gunbjrg Nygrd Haugstulen

Offshore Manager, DSN: Distribution:

Shift Supervisor, DSN Deck Foreman, DSN: Crane Operator, DSN: Senior Surveyor, DSN: ROV Supervisor, DSN: Online Surveyor, DSN:

1 1 1 1 1 1 1

DP operator/Captain, DSN: Client Representative, DN: NeoDrill Representative, ND: Survey engineer, iSurvey: Geograf Representative, Geograf: Total number of copies:

1 1 1 1 1 12

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Item TASK DESCRIPTION Resp. Check 1. Initial status 1.1. Vessel set up on DP at installation location. All DP trials

completed. Bridge / Survey

1.2. SJA and TBT completed and documented. Project Engineer 1.3. Bridge to give permission to start operation. Bridge 1.4. Minimum people required per shift for the operation:

- 1x Shift Supervisor - 1x Deck foreman - 2x Riggers - 1x Crane operator - 2x ROV crews - 1x Client, Det Norske - 1x Client, NeoDrill - 1x iSurvey - 1x Geograf

ALL

1.5. Work permit for hot work on deck issued and approved. Deck Foreman 1.6. Work permit for working at height issued and approved. Deck Foreman 1.7. Work permit for heavy lifting issued and approved. Deck Foreman 1.8. The deck is prepared for deployment of CAN units. Bulwark

removed from the overboarding area and replaced by temporary and removable railing.

Deck Foreman

1.9. Ensure sufficient weather window is available for operation. Ref. Deployment Analysis.

OM / DN

2. Subsea Preparatory Work Resp. Check 2.1. Launch ROV#1, bring and place transponder for DP-system on

sea bed according to bridges instructions. ROV / Bridge

2.2. Check transponder communication. Bridge 2.3. ROV#1 to perform location survey as per DNs instructions.

Verify current conditions, Verify installation location is free for any visual debris

and boulders.

ROV / DN

2.4. ROV#1 to dredge 0,5m top soil from the planned position of the CANs as specified by client.

ROV / iSurvey / DN

3. Deck Preparatory Work Resp. Check 3.1. Notify the scaffolding supervisor in due time prior to entering the

CAN access towers to allow inspection and approval of access tower.

Deck Foreman

3.2. Barrier off back deck. Note: All personnel to get clearance from Deck Foreman before crossing the barriers and entering the back deck. Only required personnel to be present.

Deck Foreman

3.3. Scaffolding supervisor to prepare CAN access tower with gangway for entrance to the top of CAN. Deck crew to assist as required.

Deck Foreman

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Item TASK DESCRIPTION Resp. Check 3.4. iSurvey to activate Gyro on top of CAN. Notify Deck Foreman

before entering the access tower. Ensure correct use of working at height PPE. Scaffolding supervisor to advice if required.

iSurvey

3.5. Prepare crane hook with stabilising rigging for hooking up CAN rigging. Ensure no personnel present on top of CAN or in CAN access tower.

Deck Foreman / Crane

3.6. Position crane hook above centre of CAN and land on CAN top. Crane operator to confirm crane hook is laying stable before riggers entering


3.7. Hook up crane to CAN lift rigging. Ensure slings are not twisted when hooked up. Ensure correct use of working at height PPE. Scaffolding supervisor to advice if required. If required, cover centre hole of CAN to reduce risk of falling in.


3.8. Take up slack in CAN lift rigging. Ensure personnel is well clear of crane hook as this is lifted off the CAN top. Verify correct lifting arrangement; make sure to avoid potential tangle up, or interference with instrumentation. If necessary, perform visual check from crane / MHT.


3.9. Scaffolding supervisor to remove gangway between CAN top and CAN access tower. Deck crew to assist as required.

Deck Foreman

3.10. Following consent from Captain, cut CAN free from sea fastening steel. Fire hose and fire guard to be present on/below deck during removal of CAN seafastening.

Deck Foreman

3.11. Remove the temporary railing at the overboarding area. Use of life west and lanyard required.

Deck Foreman

4. Deployment of CAN Resp. Check 4.1. Note: Only key personnel for the overboarding and

deployment operation to be present on deck. ALL

4.2. Ensure minimum 50m vessel offset from any subsea asset prior to overboarding.

Bridge

4.3. Inform Bridge about forthcoming heavy lift. Static weight: 55Te. Maximum expected dynamic load: 105Te.

Deck Foreman

4.4. Perform communications check between all involved parties. Note: Deck Foreman to be single point of contact during the overboarding and deployment operations.

Deck Foreman

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Item TASK DESCRIPTION Resp. Check 4.5. On confirmation from the bridge, start to pick up tension on

crane wire. Deck Foreman / Crane

4.6. Lift CAN approx 0.5m up from deck and slew crane outboard to overboard CAN according to Lift Plan.


4.7. Lower CAN through the splash zone. Maximum lowering speed thought splash zone: 0.5 m/s. Keep CAN in vertical position and the lifting slings under tension throughout the lift. Allow sufficient time to let the trapped air escape during lift.


4.8. Note: Shift Supervisor to take over control of operation when CAN is fully submerged.

ALL

5. Landing of CAN 5.1. Reset crane trip-counter, and commence lowering CAN to

approx. 50 meters below surface. Max recommended lowering speed 0.6 m/s.

Shift Supervisor / Crane

5.2. ROV-2 to check rigging and monitor CAN during the remaining lowering towards seabed.

ROV

5.3. Continue lowering CAN until bottom of CAN is located approx 10m above seabed. ROV-2 monitoring CAN.

Shift Supervisor / Crane / ROV

5.4. Relocate vessel to position CAN above installation position. Engage crane in AHC mode when appropriate.

Shift Supervisor

5.5. Check CAN heading by gyro and confirm visually by ROV-2. iSurvey to constantly monitor position. If necessary, adjust CAN heading by ROV, then touch down CAN for position fixation and confirm heading by ROV.

ROV / ND / iSurvey

5.6. Lower CAN such that it just touches the seabed. Shift Supervisor / Crane /

5.7. Re-check and adjust heading of CAN. If necessary, adjust CAN heading by ROV, then touch-down CAN for position fixation and confirm heading by ROV.

ROV / iSurvey

5.8. Upon DN consent of correct set down position and orientation of CAN, proceed to penetrate CAN.

Shift Supervisor / iSurvey / DN

6. Self penetration of CAN 6.1. Lower CAN very slowly and let CAN self-penetrate with crane in

AHC until crane start losing weight. Then switch crane to CT mode.

Shift Supervisor / Crane iSurvey / ND

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Item TASK DESCRIPTION Resp. Check 6.2. Penetration of CAN as follows:

- Set down weight in 5 ton increments, keep for 10 minutes / stop

- iSurvey to continuously monitor CAN inclination. - If CAN inclination > 1o, pick up weight to bring CAN to

previous stop; keep for 10 minutes. Offset vessel slightly if required to maintain correct inclination.

- Continue setting down weight in increments as above. - If CAN inclination > 1o at end of self-penetration, reset

CAN*. - Minimum tension in crane: 10Te. ND to monitor and record the CAN self-penetration process. *New position to be given by DN/Geograf.

Shift Supervisor / Crane iSurvey / ND

6.3. When CAN is self-penetrated (3-4m?), make full stop for verification of CAN inclination to be witnessed by Client.

Shift Supervisor / ND / DN

6.4. At fully self-penetrated CAN, maintain a line tension of 10-20Te for the remainder of the installation process.

Shift Supervisor / Crane

7. Suction of CAN 7.1. ROV-2 to install pump lid on suction flange. Shift Supervisor /

ROV

7.2. ROV-2 establish a steady pump rate at initially moderate P (0,1 0,2 bar). iSurvey to monitor CAN penetration vs P / time.

Shift Supervisor / ROV

7.3. Increase P in increments of 0,1 bar and monitor penetration rates as penetration resistance increases. iSurvey to continuously display & record CAN penetration / inclination data.

Shift Supervisor / ROV iSurvey

7.4. Continue the CAN penetration operations, with slower penetration rate expected for the last 1 m. As needed, increase P to max 2 bar at end of penetration. Slow down pump rate and allow pumping soily water until full penetration stop, or at sea bed level.

Shift Supervisor / ROV iSurvey

7.5. If CAN confirmed acceptably penetrated, proceed as per Item 9.1 below. If unsuccessful penetration, proceed as per Item 8.1 below.

Shift Supervisor ND / DN

8. Contingency 8.1. If installation not accepted, evaluate pumping CAN out to 6.5m

penetration before proceeding to next item. Shift Supervisor / ND / DN

8.2. ROV remove Pump Lid 2 and park same on CAN top. Shift Supervisor / ROV

8.3. ROV to dredge soil from CAN inside. Soil removal to be undertaken through both CAN-openings. Sufficient volume to be calculated by ND.

Shift Supervisor / ROV ND

8.4. Re-install lids and resume suction operations. Shift Supervisor / ROV

8.5. Penetrate CAN until fully penetrated as per installation criteria. Shift Supervisor / ROV

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Item TASK DESCRIPTION Resp. Check 8.6. If CAN still cannot be fully penetrated it is likely that a boulder

has been hit. In that case, prepare contingency location of CAN with dredger as described in item 2.4 above. Contingency plan for retrieving CAN clear of seabed to be agreed on:

Increase tension in crane to submerged weight of CAN with crane in CT mode.

Reverse ROV pump to pump water inside CAN. Keep P to max 2 bar at initiation of retrieval.

Increase tension in crane in 5Te increments until CAN start to move or reaching maximum 110Te.

If maximum tension of 110Te is reached without CAN moving, increase P in 0.5 bar increments until CAN start to move or reaching maximum 3 bar (the CAN is designed to withstand 6 bar fully penetrated).

Reduce P and crane tension accordingly as the CAN is hoisted.

Special attention has to be carried out when the CAN is about to break free of seabed. Switch crane to AHC mode as CAN just becomes free.

Reposition CAN to contingency location and commence installation as per item 5.5.

Shift Supervisor / ROV DN / ND / iSurvey

8.7. Disconnect pump lid from suction flange. Shift Supervisor / ROV

8.8. Verify correct CAN penetration and verticality by ROV, and inspect CAN penetration by means of ROV survey on marking on side of CAN.

Shift Supervisor / ROV / iSurvey

8.9. ROV to measure final stickup of CAN above mudline. ROV / iSurvey 9. Post Survey and Recovery 9.1. ROV disconnect lifting gear from CAN. Recover Crane hook &

CAN lifting gear. Minimum 25m vessel offset during recovery of lift rigging.

Shift Supervisor / ROV / Crane

9.2. Vessel shift to location # 2 and install CAN # 2 as per above Task Plan.

Shift Supervisor / Bridge

9.3. On completion of self penetration, relocate aft CAN Lid from CAN #1 to aft suction flange on CAN #2. Ensure to keep CAN Lid clear of centre pipe of CAN to avoid dropping frames inside pipe.


9.4. Recover Gyro Frames from both CANs. Ensure to keep Gyro Frames clear of centre pipe of CAN to avoid dropping frames inside pipe.


9.5. ROV to install Corrosion Plugs on suction flanges. Ensure to keep Corrosion Plugs clear of centre pipe of CAN to avoid dropping plugs inside pipe.


9.6. ROV-1 to perform as-installed survey. ROV / Survey 9.7. Recover both ROVs. ROV / Bridge

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5. APPENDICIES

5.1 APPENDIX A VESSEL DECK LAYOUT

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5.2 APPENDIX B LIFT PLANS

Document title:

Template - Lift Plan

(Template: Document No: DSUK-RV-TP-0001 - Rev. No: 1.01 - Date issued: 01.02.2011)

Page: 1 of 2

Lift plan title Deployment of 2x CAN Suction Anchor Nodes

Vessel/site Skandi Constructor

Client/project/location Jette field

Lift location: Main deck/quayside/yard/etc.Main deck

Lift type Routine Non-routine

References. Lift plan no. 1 Procedures ref. 600205-xxxx-xxx-xx-xxxx

Risk assessment no. Drawings ref

Permit to work no.

Load details/crane details(maximum hook load not to be exceeded)

Load identification (include load dimensions): Centre of gravity: Design lift conditions (maximum):

H: 8m, Dia: 6m, Obvious Estimated Drawing Wind (knots): Wave (m):

Gross lift weight/maximum hook load Water depth: Crane configuration/mode:

In air: 55 Te Actual Normal during deployment.

AHC above sebed, CT for penetration In water: TBC Assessed

Maximum radius: SWL at this radius: Design hook height :

21m 65 Te Maximum hook height: 24.5m over bullwork.

Description of lifting operation

Remove seafastening. Lower main hook to the vessel deck. Connect slings from the CAN to the hook. Slowly increase tension in the

the crane to 5 Te andstop. Verify that rigging is not snagging or twisted. Increase tension to 55 Te and verify that seafasteing is not

snagging. Lift CAN approx 1.5 m above deck and slew crane outboard to deployment position perpendicular to the moonpool.

Possible safety measures to be considered (tick as applicable and detail in step-by-step section overleaf)

To be completed onshore for safety measures included in installation procedure/offshore by lift supervisor for any additional considerations

Weight not verified Lifting equipment/accessories certificates Emergency/rescue plans

Stability of load Stability of lifting equipment Environment: vis./wind speed/wave ht./ tide

High centre of gravity Pre-use equipment checks Sudden changes in environmental conditions

Awkward size/shape/sharp edges Crane mode verified Load visibility during night/subsea working

No dedicated lift points Vessel stability Blind lifting

No certified suspension points for lifting equip Vessel ballasting required Lighting pick-up and set-down areas

Packing protection load /lifting equipment

/assets Lifting over plant/equipment/assets Dynamic factors involved

Loose objects removed from load Restricted head room Seabed suction

Load on pallet requires securing Lay-down area size/strength/stability Seabed conditions

Tag lines required Route and lay-down area clear & barriered Competent and sufficient personnel

Buoyancy of objects Route and lay-down area obstructed Suitable adequate supervision

Lifting of chemicals Lay-down in operational radius of lifting

equipment Correct PPE

Access and egress for slinging Conflicting operations Toolbox talk required

No lift point directly above load Cultural, communication, language issues Sea fastenings / tie downs removed

Accessories/equipment fit for purpose/SWL Diving operations precautions Pre-use equipment check

Lifting of personnel (attach task risk assessment with information on the following)

Prevention of person(s) becoming stuck

/trapped Environmental hazards Vessel-/site-specific procedures

Prevention of person(s) falling/being crushed Correct PPE/harnesses/etc. Equipment secured in transporter

Comms between passengers /operator Trained/competent personnel Efficient means of rescue

Suitability of equipment and accessories Certification/pre-use checks Limiting conditions of use

Document title:

Lift Plan

(Template: Document No: DSUK-RV-TP-0001 - Rev. No: 1 - Date issued: 22.04.2008)

Page: 2 of 2

Any further safety measures (as identified in the risk assessment; remember SIMOPs)

Communications

Communications available:

Primary (VHF) Secondary (hand signal) Other (specify):

Communication checks:

Primary checked Secondary checked

Lifting equipment and accessories to be used (specify type, SWL and configuration)

TBC pending documentation of dynamic analysis confirming maximmum dynamic hook load.

Step-by-step details of lifting operation Control Responsible person

Weather Limits OK Captain/Offshore Manager/Client Offshore Manager

SJA Held Offshore Managerr Shift Supervisor

Toolbox Talk Shift Supervisor Shift Supervisor

Lifting Certificate Valid Deck Foreman Shift Supervisor

Remove Seafastening Deck Foreman Shift Supervisor

Conenct lift rigging Deck Foreman Shift Supervisor

Verify lifting is not snagging Deck Foreman Shift Supervisor

Lift CAN off Deck Deck Foreman Shift Supervisor

Deploy CAN through spalshzone Shift Supervisor Shift Supervisor

Lower CAN to seabed Crane Operator Shift Supervisor

Disconnect Rigging ROV Supervisor Shift Supervisor

Recover Crane Hook to deck Crane Operator Shift Supervisor

Technical review

Has a technical review been conducted? Yes (attach details) No

Sketches

Sketch detailing the rigging-up of the lifting equipment and lifting

accessories (optional)

Sketch of initial pick-up location, load path and lay-down area (include

any obstructions or equipment clashes that may occur and how they will

be avoided)

Ref sketch XXX Ref deck layout

Debrief and learning points (did the lift go as planned or are changes to the lift plan required?)

Action Print Name Signature Date

Competent person Lift supervisor(s)

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5.3 APPENDIX C CAN LIFT RIGGING

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5.4 APPENDIX D DEPLOYMENT ANALYSIS

Page: 1 of 26 Originator: HSChecker: VHo

Date: 17.02.2012

1. Introduction

1.1 BackgroundThis mathcad program is developed by DOF Subsea Norway AS and is tailored for the calculationof dynamic forces during recovery/deployment of structures using the main crane onboard thevessel "Skandi Constructor".

The calculations are carried out according to: A. DNV-RP-H103 Modelling and Analysis of Marine Operations, April 2010B. DNV-RP-C205 Environmental conditions and environmental loads, April 2007C. O. M. Faltinsen, Sea loads on ships and offshore structures, 1990D. D. E. Newland, An Introduction to random vibrations, spectral and wavelet analysis, 1993

1.2 ScopeThe scope of this document is to determine the dynamic forces during launch and recovery offa CAN suction anchor through wavezone and suggest an operational limit. Illustrated in thefollowing figure

1.3 AbbreviationsCOG Center of GravityCFD Computational Fluid DynamicsRAO Response Amplitude OperatorHs Significant wave height Tz Wave zero crossing period

1.4 GeneralSince the operations is independent of vessel heading has the head sea condition beenapplied for determination the operational limit. It should be noted that the influence from portand starboard quartering seas aslo have been investigated, and based upon the results fromthese heading angles can it be concluded that the heading angles only have minor effectson the forces in the splash zone when compared to head sea. The reason for this is that thewave particle velocity and acceleration are the governing when determining the forces inthese particular sea states.

600205 Skandi Constructor Deployment Analysis


Date: 17.02.2012

1.5 ConclusionThe weather criteria given in the table below shall be followed in order to ensure a safe liftingoperation with respect to the hydrodynamic loads during the launch of the CAN suctionanchors. The sea states which are highlighted green are safe conditions while the red are notacceptable.

Hs/Tz 4.5s 5.5s 6.5s 7.5s 8.5s 9.5s 10.5s 11.5s 12.5s1.0m OK OK OK OK OK OK OK OK OK1.1m No OK OK OK OK OK OK OK OK1.2m No OK OK OK OK OK OK OK OK1.3m No No OK OK OK OK OK OK OK1.4m No No OK OK OK OK OK OK OK1.5m No No No OK OK OK OK OK OK1.6m No No No OK OK OK OK OK OK1.7m No No No OK OK OK OK OK OK1.8m No No No No OK OK OK OK OK1.9m No No No No OK OK OK OK OK2.0m No No No No OK OK OK OK OK2.1m No No No No No OK OK OK OK2.2m No No No No No OK OK OK OK2.3m No No No No No OK OK OK OK2.4m No No No No No No OK OK OK2.5m No No No No No No OK OK OK2.6m No No No No No No OK OK OK2.7m No No No No No No OK OK OK2.8m No No No No No No No OK OK2.9m No No No No No No No OK OK3.0m No No No No No No No OK OK3.1m No No No No No No No OK OK3.2m No No No No No No No No OK3.3m No No No No No No No No OK3.4m No No No No No No No No OK3.5m No No No No No No No No OK3.6m No No No No No No No No No3.7m No No No No No No No No No



Date: 17.02.2012

The maximum Dynamic Amplification Factor in the safe weather criteria is:

DAF = 1.916

And the maximum force on the lifting system:

Fmax = 1033.4 kN

The results are also shown graphically in chapter 4 and in chapter 5.

2. Input data

2.1 Applied constants

g 9.807m

s2 acceleration of gravity

1025kg

m3 density of sea water

s 7850kg

m3 density of steel

c 2150kg

m3 density of concrete



Date: 17.02.2012

2.2 Structure data

H 8m Height of CAN

r 3m Radius of CAN

rp 0.559m Radius of pipe in the centre of the CAN

VR43 r3 113.1 m3 Referance Volume for calculation of added

mass

M 55tonne Static mass of CAN

Ms M Submerged weight of CAN

V r2 H 226.2 m3 Volume of CAN

Ap r2

28.27 m2 Efficient cross sectional area of basketprojected on a horizontal seawater plane

As Ap Slamming area of structure



Date: 17.02.2012

2.3 Hydrodynamic properties of structureDrag coefficient

The drag coefficient in oscillatory flow varies with the Keulegan-Carpenter number and cantypically be 2 or 3 times larger than the drag coefficient in steady flow. DNV-RP-H103 proposethat the drag coefficient in oscillatory flow should be equal to or larger than 2.5 unless specificmodel tests or CFD studies have been performed. For long slender elements the drag coefficiencan be taken as twice the steady state drag coefficient.

Cd 1.5 drag coefficient

Slamming coefficient

Slamming coefficient for a non cylindrical shaped structure:

Cs 5.0 slamming coefficient

Added mass

The following is a simplified approximation of the added mass in heave for a three-dimensionalbody with vertical and is not considered applicable for perrforation rates above 50%

CA 0.64 Added mass coefficient for acircular plate (ref. DNV-RP-C205 APPENDIX A)

Added mass for a flatcircular plateA33o CA VR A33o 74191.9 kg

Ap

H Ap 0.399

Solid added mass of thestructure (added mass in heavefor a non perforated structure)

A33s 11 2

2 1 2

A33o

Mw r2

H rp2

H 223.8 tonne Mass of water trapped inside theCAN

p 5 Perforation rate (assumedpercentage)



Date: 17.02.2012

A33 A33s Mw p 5if

A33s 0.7 0.3 cos p 5( )

34

Mw 5 p 34if

A33s e

10 p

28 Mw 34 p 50if

"Perforation rate too large"return p 50if

A33 342.7 tonne Added mass of the structure

2.4 Vessel & crane dataCrane data

The location of the crane tip is estimated from the Center of Gravity of the vessel:

x0 16.67m X - location of crane tip from COG

y0 17.5m Y - location of crane tip from COG

vc 0.5ms

Hook lowering/retrieval velocity

Vessel heading

According to DNV-RP-H103 should heading angles of 15 degrees be investigated foroperations that are independent of vessel heading. For operations that are dependent of vesselheading shall all heading angles be investigated and the worst case scenario shall be applied inthe calculations when determining operational limit.

0 30 60 90 120 150 180 210 240 270 300 330( )T

180 Vessel headings as stated in

RAOs

n 0 Vessel heading to be calculated: n = 0 (0deg), n = 1 (15deg)... n = 8 (180deg)

n 0



Date: 17.02.2012

2.5 Response Amplitude Operators for Scandi ConstructorThe Response Amplitude Operators for the vessel are calculated in the vessel motion programVeRes and are for light loading condition. The origin of local coordinate system is given in theCOG where the x-axis is positive towards stern and the y-axis is positive towards starboard.The RAOs and phase angles are imported to Mathcad from a data file containing the necessaryinput data. Only the heave, roll and pitch motions are imported since the vertical responses areof particular interest.

0 10 20 300

0.5

1

1.5Heave

RAO3

Te

0 10 20 300

0.01

0.02

0.03Pitch

RAO5

Te

0 10 20 300

0.02

0.04

0.06

0.08Roll

RAO4

Te



Date: 17.02.2012

3. Spectral analyses & vessel motionsAccording to DNV-RP-H103 should the applied values for crane tip heave displacement,velocity and acceleration represent the most probable largest single amplitude responses. Thesignificant responses may be found by combining the crane tip Response Amplitude Operatorwith an applicable wave spectrum in order to find the crane tip response spectrum and thecorresponding heave displacement, velocity and acceleration.

3.1 Response Amplitude Operator at crane tip

e 2

Te encounter wave angular frequency

kee

2

g encounter wave number

The complex transfer functions in COG are found by combination of the Response AmplitudeOperators and the phase angle for each wave period. The theoretical background for the followingequations is found in O.M Faltinsen and D.E newland.

The complex transfer functions in heave, roll and pitch are expressed:

H3j kRAO3j k

e3j k

i Complex transfer function in heave

H4j kRAO4j k

e4j k

i Complex transfer function in roll

H5j kRAO5j k

e5j k

i Complex transfer function in pitch

The complex wave transfer function between the wave excitation in COG and the crane tip isexpressed:

Hwj ke

kejx0 cos k kej y0 sin k

i

By combination of the heave, roll and pitch motion of the vessel the following complex transferfunction at crane tip can be established:

Hctj kH3j k

x0 H5j k y0 H4j k

Hwj k



Date: 17.02.2012

The corresponding Response Amplitude Operator at the crane tip is the magnitude of thecomplex transfer function:

RAOctj kHctj k

Hctj k

The Response Amplitude Operator at the crane tip as function of encounter period:

0 10 20 300

0.2

0.4

0.6

0.8

1

RAOctj n

Tej



Date: 17.02.2012

3.2 JONSWAP spectrumThe JONSWAP (Joint North Sea Wave Project) spectrum describes the wind sea condition thatfrequently occur in the Norh Sea. The JONSWAP spectrum is formulated as a modification of thePierson-Moskowitz spectrum for a developing sea state in a fetch limited situation.

i 0 30 counter for significant wave height

j 0 9 counter for wave period

Environmental conditions:

Hs 0.1m Incremental significant wave height

Hsi1.0m i Hs Significant waveheight

Tz 1.0s Incremental zero crossing period period

Tzj4.5s j Tz Zero crossing period

3.3 Typical peak shape parameter for North Sea

Peak period of JONSWAP spectra from approximate relation:

TpTz

0.6673 0.05037 0.00623 2 0.0003341 3 Peak period

p2 Tp

Peak frequency of spectrum

0 0.01s1

Lower frequency limit

1 8.0s1

Upper frequency limit

0.02s 1 Incremental frequency

0 1 Frequency spectrum



Date: 17.02.2012

k ( )

2

g Wave number

Pierson-Moskowitz spectra:

SPM Hs p 516

Hs2p

4

5 e

5

4

p

4

A 1 0.287 ln ( ) Normalizing factor

p 0.07 pif0.09 pif

Spectral width parameter

JONSWAP spectrum:

Sj Hs p A SPM Hs p e0.5

p

p p

2

3.3 Wave statisticsWave statistics from the JONSWAP spectrum are calculated in order to verify that the outputvalues from the applied spectrum are correct.

Spectral moments moments of the wave spectra:

M0i j0

1

0 Sj Hsi pj

d

M1i j0

1

1 Sj Hsi pj

d

M2i j0

1

2 Sj Hsi pj

d



Date: 17.02.2012

Evaluation of sea state parameters:

Hm0i j4 M0i j Significant wave height

Tm02i j2

M0i jM2i j

Zero crossing period

Tm01i j2

M0i jM1i j

Mean wave period

tduration 30 60 s Duration of sea state in a 30 minute interval

Nti j

tdurationTm02i j

# Independent local maxima waveheights

Hmaxi jHsi

0.5 ln Nti j

Most probable largest wave

Hmediani jHsi

0.5 ln Nti j

10.1825

ln Nti j

Median value

Hextremei jHsi

0.5 ln Nti j

10.2886

ln Nti j

Expected extreme value



Date: 17.02.2012

3.4 Crane tip response spectrumThe vertical crane tip response spectrum can be found by combining the RAO at the crane tipwith the wave excitation response spectrum - JONSWAP.

Using linear interpolation to find the RAO at crane tip as function of the wave frequency asspecified in chapter 3.1:

RAO ( ) linterp e RAO RAO is the RAO at crane tip for specified heading anglThe response amplitude operator at the crane tip for the given heading angle:

0 0.5 1 1.50

0.2

0.4

0.6

0.8

1

RAO ( )

The crane tip displacement spectrum can be found by combination of the RAO at crane tipand the wave excitation response spectrum:

Sd Hs p RAO ( )2 Sj Hs p heave displacement spectrum

By considering the wave excitation as a Gaussian distributed stationary stochastic processand by use of the autocorrelation function can the following relationship between the verticalheave displacement response spectrum and heave velocity and acceleration be established:

Sv Hs p 2 Sd Hs p heave velocity spectrum

Sa Hs p 4 Sd Hs p heave acceleration spectrum



Date: 17.02.2012

3.5 The most probable largest single amplitude responsesIn order to find the most probable largest single amplitude responses the standard deviations ofthe response spectra which is the square root of the first spectral moment/variance are found:

di j0

1Sd Hsi

pj

d standard deviation displacement spectrum

vi j0

1Sv Hsi

pj

d standard deviation velocity spectrum

ai j0

1Sa Hsi

pj

d standard deviation acceleration spectrum

For lifting operations shorter than 30 minutes the most probable largest single amplituderesponses can be taken as 1.8 times the significant responses and for lifting operationsexceeding 30 minutes it can be taken as 2.0 times the significant responses.

sr 1.8 significant response factor assuming lifting operation shorter than 30 minutes

The most probable characteristic single amplitude responses during a 0.5 hour sea state canthen be expressed:

dcti jsr 2 di j

single amplitude displacement

vcti jsr 2 vi j

single amplitude velocity

acti jsr 2 ai j

single amplitude acceleration



Date: 17.02.2012

4. Lifting through splash zone

4.1 Introduction to the simplified method4.1.1 Main assumptions

The following chapters will go through the simplified method for calculation of loads on objectslowered through splash zone as described in DNV-RP-H103 Modeling and Analysis of MarineOperations. The object of the Simplified Method is to give simple conservative estimates of theforces acring on an object lowerered though wave zone. The simplified method is based upon thefollowing main assumptions:

The horizontal extent of the lifted object is small relative to the wavelengthThe load case is dominated by the vertical acting forcesThe vertical motion of the object follows the crane tip motions

4.1.1 Load cases during lifting through wave zone

The lowering through wave zone is divided into four load cases:

When the structure is in airWhen the structure penetrates water surfaceWhen the structure is fully submerged

4.1.2 Wave periodsDNV-RP-H103 propose that the following wave period range should be applied in the analysis:

8.9Hsg

Tz 13s wave period range

Results from the deployment calculations will mainly be presented as function of waveheight forwave periods of 6s, 8s and 10s since these wave periods describe sea states that often occur inthis particular significant waveheight range.

4.1.3 Accept criteria

Snap forces shall as far as possible be avoided and the weather criteria should be adjusted toensure this. Snap forces in slings and hoist line may occur if the hydrodynamic force exceedsthe static weight of the object. In order to avoid snap loads the following slack sling criterionshall be fulfilled:

Fhyd < 0.9 Fstatic.-min Slack sling criterion

In the following chapters are the upward acting hydrodynamic forces presented along with theacceptance criterion. The slack sling criterion is the factor for determining the operational limitunless the dynamic hook load is exceeding crane limit, size of rigging etc.

4.1.4 Dynamic amplification factor

The dynamic amplficitation factor is a relationship between the total dynamic hook load and thestatic weight of the object in air.



Date: 17.02.2012

4.2 Wave kinematics 0.9 Hs wave amplitude assuming lifting operation shorter than 30 minutes

z2Tz

wave angular frequency

kzz

2

g wave number according to the dispersion relationship at deep water

4.4 Lifting in airIn this case the structure is in air and the only dynamic load on the system inertia force due toheave acceleration at crane tip.

The static force in air:

Fstatic_air M g 539.366 kN

The characteristic inertia force:

Finertiai jM acti j

Total force in air:

Ftot_air Fstatic_air Finertia

Dynamic Amplification Factor:

DAF_airFtot_air

Fstatic_air



Date: 17.02.2012

Dynamic Amplification in air:

4 6 8 10 12 141.01

1.02

1.03

1.04

1.05Hs = 1.5mHs = 2.0mHs = 2.5m

DAF_air5 j

DAF_air10 j

DAF_air15 j

Tzj



Date: 17.02.2012

4.5 Penetrating water surfaceThe lower part of the structure is hit by waves which cause slamming loads on the structure. Theonly hydrodynamic forces acting on the structure are the upward acting slamming force on thebottom of the structure. Since inertia forces in air is small compared to the slamming loads it maybe neglected. The relative velocity between the object and water particles governs the slammingimpact.

Characteristic wave particle velocity at free surface: z 0m depth

vwi ji zj e

kzj z

The characteristic slamming velocity:

vsi jvc vcti j

2 vwi j

2

Slamming force on bottom of structure:

Fslami j0.5 Cs As vsi j

2

Total dynamic forces acting on the structure:

Ftot_slam Fstatic_air Fslam

Dynamic amplification factor:

DAFslamFtot_slamFstatic_air

Acceptance criteria:

Facc_slam 0.9 Fstatic_air



Date: 17.02.2012

Dynamic Amplification Factor when penetrating surface:

1 2 3 41

2

3

4Tz = 5.5sTz =7.5sTz = 9.5s

DAFslami 1

DAFslami 3

DAFslami 5

Hsi

Upward acting hydrodynamic forces and accept criterion:

1 2 3 40

5 105

1 106

1.5 106

2 106Tz = 5.5sTz =7.5sTz = 9.5sAccept criterionFslami 1

Fslami 3

Fslami 5

Facc_slam

Hsi



Date: 17.02.2012

4.7 Structure fully submergedThe load components are drag forces and mass forces on the whole structure. The wave particlevelocity and acceleration induced forces are related to the vertical center of gravity of thesubmerged part of the structure, approximated as H/2 from free surface.

Characteristic wave particle velocity at H/2 from free surface: zH2

z 4 m depth

vwi ji zj e

kzj z

The characteristic vertical velocity between the object and water particles:

vri jvc vcti j

2 vwi j

2

Characteristic wave particle acceleration at H/2 from free surface:

awi ji zj

2 e

kzj z

The characteristic mass force on the structure due to the combined acceleration of objectand water particles is expressed:

FMi jM A33 acti j

2 V A33 awi j

2

The characteristic drag force on the structure due to the relative velocity between the object andwater particles:

FDi j0.5 Cd Ap vri j

2

The total hydrodynamic forces can then be calculated:

Fhyd_subi jFDi j

2 FMi j

2

The static force when fully submerged:

Fstatic_sub M g 539.366 kN



Date: 17.02.2012

Total forces acting on structure:

Ftot_sub Fstatic_sub Fhyd_sub

Dynamic Amplification factor:

DAFsubFtot_sub

Fstatic_air

Acceptance criteria:

Facc_sub 0.9 Fstatic_sub

Dynamic Amplification factor when fully submerged:

1 2 3 41

2

3

4Tz = 5.5sTz =7.5sTz = 9.5s

DAFsubi 1

DAFsubi 3

DAFsubi 5

Hsi



Date: 17.02.2012

Upward acting hydrodynamic forces and accept criterion:

1 2 3 40

5 105

1 106

1.5 106

2 106Tz = 5.5sTz =7.5sTz = 9.5sAccept criterionFhyd_subi 1

Fhyd_subi 3

Fhyd_subi 5

Facc_sub

Hsi



Date: 17.02.2012

5. Results - Operational limitWith reference to DNV-RP-C205 Appendix C are the wave period range 4.5s - 16.5s in sea statesof 1.5m - 2.5m where the upper and lower limits of the wave period rarely occur. Since the waveperiods and significant waveheight govern the wave particle velocity and acceleration the resultsare shown as function of wave height for different wave periods.

5.1 Slack sling criterionIn order to avoid slack slings/hoist line the hydrodynamic forces shall not exceed the acceptancecriteria.

Case 2 - Hydrodynamic forces

1 2 3 40

1 106

2 106

3 106Tz = 4.5sTz = 5.5sTz = 6.5sTz = 7.5sTz = 8.5sAccept criteria

Fslami 0

Fslami 1

Fslami 2

Fslami 3

Fslami 4

Facc_slam

Hsi



Date: 17.02.2012

Case 3 - Hydrodynamic forces (operational limit design)

1 2 3 40

5 105

1 106

1.5 106

2 106Tz = 4.5sTz = 5.5sTz = 6.5sTz = 7.5sTz = 8.5sAccept criteria

Fhyd_subi 0

Fhyd_subi 1

Fhyd_subi 2

Fhyd_subi 3

Fhyd_subi 4

Facc_sub

Hsi

acceptance criteria check

checki j if Facc_sub Fhyd_subi j "No" "OK"

OP1 i 0

Hsim

OP0 j 1

Tzjs

OP1 i 1 j checki j



Date: 17.02.2012

Operational limit

Based upon the results are the Case 3 the most onerous position with respect to possibility ofslack slings. The operational limit can also be seen in the table below:(rows are significant wave height and columns are wave period)

OP

0 1 2 3 4 5 6 7 8 9

01

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.51 "OK" "OK" "OK" "OK" "OK" "OK" "OK" "OK" "OK"

1.1 "No" "OK" "OK" "OK" "OK" "OK" "OK" "OK" "OK"

1.2 "No" "OK" "OK" "OK" "OK" "OK" "OK" "OK" "OK"

1.3 "No" "No" "OK" "OK" "OK" "OK" "OK" "OK" "OK"

1.4 "No" "No" "OK" "OK" "OK" "OK" "OK" "OK" "OK"

1.5 "No" "No" "No" "OK" "OK" "OK" "OK" "OK" "OK"



1.8 "No" "No" "No" "No" "OK" "OK" "OK" "OK" "OK"

1.9 "No" "No" "No" "No" "OK" "OK" "OK" "OK" "OK"

2 "No" "No" "No" "No" "OK" "OK" "OK" "OK" "OK"

2.1 "No" "No" "No" "No" "No" "OK" "OK" "OK" "OK"



2.4 "No" "No" "No" "No" "No" "No" "OK" "OK" ...

5.2 Total dynamic hook loadsThe total loads or dynamic amplification factor should be applied when determining riggingdesign.

Finding the maximum amplification factor within the operation limit:

slingi j if Facc_sub Fhyd_subi j "NA" max DAF_airi j DAFslami j

DAFsubi j



Date: 17.02.2012

sling

0 1 2 3 4 5 6 7 8

01

2

3

4

5

6

7

8

9

10

11

12

13

14

15

1.852 1.743 1.621 1.52 1.441 1.376 1.324 1.281 1.247"NA" 1.818 1.683 1.572 1.485 1.414 1.356 1.31 1.271

"NA" 1.892 1.746 1.625 1.529 1.452 1.389 1.338 1.296

"NA" "NA" 1.808 1.677 1.573 1.489 1.421 1.366 1.321

"NA" "NA" 1.87 1.729 1.617 1.527 1.454 1.395 1.346

"NA" "NA" "NA" 1.781 1.662 1.565 1.487 1.423 1.371

"NA" "NA" "NA" 1.833 1.706 1.603 1.519 1.451 1.396

"NA" "NA" "NA" 1.886 1.75 1.641 1.552 1.48 1.42

"NA" "NA" "NA" "NA" 1.795 1.679 1.585 1.508 1.445

"NA" "NA" "NA" "NA" 1.839 1.717 1.618 1.537 1.47

"NA" "NA" "NA" "NA" 1.884 1.755 1.65 1.565 1.496

"NA" "NA" "NA" "NA" "NA" 1.793 1.683 1.594 1.521

"NA" "NA" "NA" "NA" "NA" 1.831 1.716 1.623 1.546

"NA" "NA" "NA" "NA" "NA" 1.869 1.749 1.651 1.571

"NA" "NA" "NA" "NA" "NA" "NA" 1.782 1.68 1.596

"NA" "NA" "NA" "NA" "NA" "NA" 1.815 1.709 ...

The maximum Dynamic Amplification Factor within the acceptable operation criteria is:

DAFmax 1.916

Which gives a total load on the lifting system:

Fmax DAFmax Fstatic_air Fmax 1033.4 kN


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Revision date

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5.5 APPENDIX E - CAN

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5.6 APPENDIX F LIDS 5.6.1 Pump Lid

5.6.2 AFT Flange lid

Document Title



Revision date

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5.6.3 Corrosion plugs

1. introduction1.1 Scope of document1.2 ObjectiveS1.3 Responsibilities1.4 Parties Involved in operation1.5 Abbreviations1.6 Definitions1.7 References

2. safety2.1 General2.2 Safe job analysis (sja)2.3 Work permit system2.4 Communication2.5 Toolbox talk2.6 Management of Change2.7 Task plan

3. Procedure3.1 Description of scope of work3.2 Installation Window3.3 Deck layout3.4 Lift Plans3.5 Deployment Analysis3.6 WORK COORDINATION3.7 Offshore Communication3.8 Vessel Data3.8.1 Skandi Constructor

3.9 ROV Data3.9.1 Triton XL 14 2000 MSW (ROV-1)3.9.2 Hydra Millennium Plus 3000 MSW (ROV-2)

3.10 Location DATA3.11 CAN orientation requirements3.12 Contingency3.12.1 Weather Standby3.12.2 DP run off3.12.3 Drive off / Drift off3.12.4 ROV Failure

4. operations4.1 TASK PLAN for installation of CAN

5. Appendicies5.1 Appendix A Vessel Deck layout5.2 Appendix B Lift Plans5.3 Appendix C CAN Lift Rigging5.4 Appendix D Deployment Analysis5.5 Appendix E - CAN5.6 Appendix F Lids5.6.1 Pump Lid5.6.2 AFT Flange lid5.6.3 Corrosion plugs

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