gen-s-a-jk-s-pr-0024_g02

HAI SU TRANG & HAI SU DEN PLATFORM AND PIPELINES

PROVISION OF OFFSHORE

TRANSPORTATION AND INSTALLATION OF THE ‘HST’ AND ‘HSD PLATFORMS AND

PIPELINES

Document No.: GEN-S-A-JK-S-PR-0024 HSD AND HST JACKET

JACKET, PILES, APPURTUNANCES AND DRILL DECK INSTALLATION PROCEDURE

Date: 16-08-2012

Revision No.: G02 of 45

REVISION RECORD SHEET

No. Rev. No. Content of Revision Date of Revision

1 A1 Issued for Internal Review 31 May 2012

2 B1 Issued for Approval 17 July 2012

3 G01 Update Section 5.3.1 and 5.3.2 06 August 2012

4 G02 Update Section 3.1.1, 3.2, 3.8, 5.4.4, 5.4.5, 5.5.1 16 August 2012




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HOLD RECORD SHEET

No. Rev. No. Section Description




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TABLE OF CONTENTS

REVISION RECORD SHEET .............................................................................................................. 2

HOLD RECORD SHEET ..................................................................................................................... 3

TABLE OF CONTENTS ...................................................................................................................... 4

LIST OF TABLES ............................................................................................................................... 6

LIST OF FIGURES ............................................................................................................................. 7

1. INTRODUCTION ................................................................................................................................. 8

1.1. GENERAL .................................................................................................................................. 8

1.2. SCOPE OF DOCUMENT ............................................................................................................... 10

1.3. DEFINITIONS AND ABBREVIATIONS.............................................................................................. 10

2. CODE, STANDARDS AND OTHER DOCUMENTS ......................................................................... 11

2.1. CODES AND STANDARDS ........................................................................................................... 11

2.2. PROJECT SPECIFICATIONS AND OTHER REFERENCES .................................................................. 11

2.3. CONTRACTOR DOCUMENTS AND REFERENCES ............................................................................ 13

2.4. SUB-CONTRACTOR DOCUMENTS AND REFERENCES .................................................................... 16

2.5. UNITS ....................................................................................................................................... 16

3. GENERAL INFORMATION .............................................................................................................. 17

3.1. HST AND HSD WHP BRIEF DESCRIPTION .................................................................................. 17

3.2. FIELD LOCATION ....................................................................................................................... 18

3.3. JACKET INSTALLATION TOLERANCES ......................................................................................... 19

3.4. SITE METOCEAN ....................................................................................................................... 19

3.5. ENVIRONMENTAL LIMIT .............................................................................................................. 19

3.6. GENERAL WEATHER CRITERIA FOR CASTORO OTTO OPERATION ................................................. 20

3.7. CASTORO OTTO MOORING CAPABILITY ...................................................................................... 20

3.8. SPECIFIC WEATHER CONSTRAINT FOR JACKET INSTALLATION ..................................................... 20

4. JACKET PRE-INSTALLATION ........................................................................................................ 21

4.1. PRE-SAILAWAY CHECK LIST ...................................................................................................... 21

4.2. MARINE SPREAD ....................................................................................................................... 21

4.3. TRANSPORTATION ..................................................................................................................... 21

5. JACKET INSTALLATION SEQUENCE ............................................................................................ 23




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5.1. JACKET PRE-INSTALLATION SURVEY .......................................................................................... 23

5.2. CASTORO OTTO PREPARATION FOR JACKET INSTALLATION ......................................................... 24

5.3. SUBSEA WELLHEAD TEMPLATE INSTALLATION ............................................................................ 25

5.4. JACKET LIFTING, UPENDING AND SET-DOWN OPERATION ............................................................ 28

5.5. PILE INSTALLATION PROCEDURE ................................................................................................ 32

5.6. JACKET INTERMEDIATE LEVELING .............................................................................................. 39

5.7. FINAL LEVELING AND CROWN PLATE INSTALLATION .................................................................... 40

5.8. LAT/MSL SURVEY ................................................................................................................... 41

5.9. PILE FINAL CUT-OFF, TRANSITION PIECE INSTALLATION AND FINAL CUT-OFF ................................ 41

5.10. BOATLANDING INSTALLATION .................................................................................................... 41

5.11. DRILLING DECK INSTALLATION ................................................................................................... 42

5.12. MISCELLANEOUS ACTIVITY ........................................................................................................ 43

APPENDIX A CASTORO OTTO CLYDE CRANE LOAD CHART .................................................. 45




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LIST OF TABLES

Table 3-1 – Platform Location ............................................................................................................................... 18

Table 3-2 – General Weather Criteria for Castoro Otto Operation ..................................................................... 20

Table 4-1 – Marine Spread ..................................................................................................................................... 21

Table 4-2 – Bollard Pull ......................................................................................................................................... 22

Table 5-1 – General Jacket Installation Sequence .............................................................................................. 23

Table 5-2 – Castoro Otto Preparation for Jacket Installation ............................................................................. 24

Table 5-3 – Subsea Template Leveling ................................................................................................................ 25

Table 5-4 – Subsea Wellhead Template and Docking Pile Installation and Pile Frame Removal .................... 25

Table 5-5 – Drilling Docking Pile and Pin Insertion ............................................................................................. 28

Table 5-6 – Mooring of Jacket Cargo Barge alongside Castoro Otto ................................................................ 28

Table 5-7 – Jacket Pre-Lifting Inspection ............................................................................................................. 29

Table 5-8 – Jacket Rigging Rig-up and Seafastening Cutting ............................................................................ 29

Table 5-9 – Jacket Lifting Off Cargo Barge and Upending ................................................................................. 30

Table 5-10 – HSD Jacket Set Down ...................................................................................................................... 31

Table 5-11 – HST Jacket Set Down ....................................................................................................................... 31

Table 5-12 – Pile Installation Sequence ............................................................................................................... 32

Table 5-13 – Pile Length and Weight Data ........................................................................................................... 34

Table 5-14 – Pile Handling Sequence with Double Crane ................................................................................... 35

Table 5-15 – Pile Handling Sequence with Single Crane .................................................................................... 35

Table 5-16 – Pile Fit-up Sequence ........................................................................................................................ 36

Table 5-17 – Pile Characteristic ............................................................................................................................ 37

Table 5-18 – Self Weight Penetration ................................................................................................................... 39

Table 5-19 – Jacket Intermediate Leveling Sequence ......................................................................................... 39

Table 5-20 – Jacket Leveling and Crown Plate Installation ................................................................................ 40

Table 5-21 – Pile Final Cut-off, Transition Piece Installation and Final Cut-off ................................................. 41

Table 5-22 – Boatlanding Installation ................................................................................................................... 41

Table 5-23 – Drilling Deck Installation .................................................................................................................. 42

Table 5-24 – Flooding Leg and Removal Flooding Lines .................................................................................... 43

Table 5-25 – Closure Plate Removal on Top of Jacket Leg ................................................................................ 43




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LIST OF FIGURES

Figure 1-1 – HST and HSD Project Layout ............................................................................................................. 9

Figure 1-2 – HST and HSD Field – Block 15-2/01 ................................................................................................... 9

Figure 3-1 – Wave Rose for July to September ................................................................................................... 19




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1. INTRODUCTION

1.1. General

Petrovietnam Technical Services Corporation, Mechanical and Construction Joint Stock Company (PTSC M&C) is a Contractor incorporated in the Socialist Republic of Vietnam and having its registered office at No. 31, 30/4 Street, Vung Tau City, the Socialist Republic of Vietnam, hereinafter referred to as “Contractor”.

Thang Long Joint Operating Company plans to award a contract to Contractor for the detailed engineering, procurement, fabrication, testing, pre-commissioning and onshore commissioning, load out and sea-fastening, installation and hook-up (hereinafter referred to as “EPCI”) of two platforms and subsea pipelines for the development of the Hai Su Trang (“HST”) and Hai Su Den (“HSD”) Fields located in Block 15-2/01 offshore the Socialist Republic of Vietnam.

The well-stream product from the HST and HSD Fields will be transported to the Te Giac Trang (“TGT”) H1 WHP, located approximately 3.0 km away from the HST platform adjacent Block 16-1, operated by Hoang Long Joint Operating Company (“HLJOC”). Thereafter, the HST/HSD well-stream will be commingled with the TGT well-stream prior to delivery to the TGT FPSO, where the commingled TGT and HST/HSD well-streams will be processed to produce commingled crude oil and commingled export gas.

Under the EPCI contract, Company requires Contractor to subcontract the offshore transportation and installation of the HST and HSD platforms and the associated infield subsea pipelines to an experienced offshore installation company, approved by Company. The terms and conditions of the subcontract shall be ‘back to back’ with the EPCI contract between Company and Contractor.

Block 15-2/01 is geologically located in the Cuu Long Basin relative to the South Eastern coastline of the Socialist Republic of Vietnam. The HST and HSD Fields are about 120 km east of Vung Tau City, and separated from each other by approximately 9.0 km, refer Figure 1-2 below.

The project includes:

HST Wellhead Separation Platform (WHSP)

HSD Wellhead Platform (WHP)

Three (3) Pipelines approximately 3.0 km long between the HST WHSP and the TGT H1 platform, comprising:

o One (1) x 16” dia. Production Pipeline

o One (1) x 8” dia. Water Injection Pipeline

o One (1) x 6” dia. Gas Lift Pipeline

Three (3) Pipelines approximately 9 km long including tie-in spools between HSD WHP and the HST WHSP, comprising:

o One (1) x 10” dia. Production Pipeline

o One (1) x 6” dia. Water Injection Pipeline

o One (1) x 6” dia. Gas Lift Pipeline




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Figure 1-1 – HST and HSD Project Layout

Figure 1-2 – HST and HSD Field – Block 15-2/01




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1.2. Scope of Document

This document describes step by step installation procedure for the HSD and HST jacket, piles and appurtenances by using Castoro Otto. The scope is limited to the offshore operations.

The pre-sailaway checklist (Ref. R132) has been presented in separated document, hence will not be detailed herein.

This manual shall also be read in conjunction with all main documents referenced and all relevant approved drawings.

1.3. Definitions and Abbreviations

PROJECT Hai Su Trang & Hai Su Den Platform & Pipelines

CASTORO OTTO (C8) T&I Subcontractor’s heavy lift installation vessel

COMPANY Thanglong Joint Operating Company (TLJOC)

MAIN CONTRACTOR Petrovietnam Technical Services Corporation, Mechanical and Construction Joint Stock Company (PTSC M&C)

T & I SUBCONTRACTOR SAIPEM ASIA SDN. BHD.

C.O.G. Center of Gravity

C.O.L Center of Lifting

DAF Dynamic Amplification Factor

HSD Hai Su Den

HST Hai Su Trang

TGT Te Giac Trang

WHP Wellhead Platform

JSA Job Safety Assessment

AHT Anchor Handling Tug

MWS Marine Warranty Surveyor

BHP British Horse Power

Bl/m blow-count / meter




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2. CODE, STANDARDS AND OTHER DOCUMENTS

2.1. Codes and Standards

R01 0027/NDI – Guidelines for Lifting Operations by Floating Crane Vessel, Rev. 9, 31 Mar 2010

R02 0028/NDI – Guidelines for the Transportation and Installation of Steel Jackets, Rev. 4, 31 Mar 2010

R03 0030/NDI – General Guidelines for Marine Transportation, Rev. 4, 31 Mar 2010

2.2. Project Specifications and Other References

2.2.1. Drawings – Flooding System

R04 HSD-A-JK-S-DW-1036-01 HSD Jacket – Flooding System Sheet 1

R05 HSD-A-JK-S-DW-1036-02 HSD Jacket – Flooding System Sheet 2

R06 HSD-A-JK-S-DW-1037 HSD Jacket – Top & Bottom Closure Details

R07 HST-A-JK-S-DW-1036-01 HST Jacket – Flooding System Sheet 1

R08 HST-A-JK-S-DW-1036-02 HST Jacket – Flooding System Sheet 2

R09 HST-A-JK-S-DW-1037 HST Jacket – Top & Bottom Closure Details

2.2.2. Drawings – Piles, Transition Piece and Crown Plate

R10 HSD-A-JK-S-DW-1020-01 HSD Jacket – Pile Make-up and Details Sheet 1

R11 HSD-A-JK-S-DW-1020-02 HSD Jacket – Pile Make-up and Details Sheet 2

R12 HSD-A-JK-S-DW-1021 HSD Jacket – Pile Stabbing Guide Details

R13 HSD-A-JK-S-DW-1023 HSD Jacket – Pile to Jacket Connection Details

R14 HSD-A-JK-S-DW-1025 HSD Jacket – Pile to Deck Transition Piece Details

R15 HST-A-JK-S-DW-1020-01 HST Jacket – Pile Make-up and Details Sheet 1

R16 HST-A-JK-S-DW-1020-02 HST Jacket – Pile Make-up and Details Sheet 2

R17 HST-A-JK-S-DW-1021 HST Jacket – Pile Stabbing Guide Details

R18 HSD-A-JK-S-DW-1023 HSD Jacket – Pile to Jacket Connection Details

R19 HSD-A-JK-S-DW-1025 HSD Jacket – Pile to Deck Transition Piece Details

2.2.3. Drawings – Boatlanding

R20 HSD-A-JK-S-DW-1031-01 HSD Jacket – Boatlanding Details Sheet 1










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R30 HST-A-JK-S-DW-1031-02 HST Jacket – Boatlanding Details Sheet 2








2.2.4. Drawings – Jacket Walkway

R38 HSD-A-JK-S-DW-1034-01 HSD Jacket – Top of Jacket Walkway at El. (+) 6.500 m – Sheet 1



R41 HST-A-JK-S-DW-1034-01 HST Jacket – Top of Jacket Walkway at El. (+) 6.500 m – Sheet 1



2.2.5. Drawings – Drilling Deck

R44 HSD-A-JK-S-DW-2024 HSD Drilling Deck – Framing Plans and Elevations

R45 HSD-A-JK-S-DW-2025-01 HSD Drilling Deck – Sections and Details – Sheet 1



R48 HSD-A-JK-S-DW-2026-01 HSD Drilling Deck – Stabbing Guide Post Details – Sheet 1

R49 HSD-A-JK-S-DW-2026-02 HSD Drilling Deck – Stabbing Guide Post Details – Sheet 2

R50 HSD-A-JK-S-DW-2027 HSD Drilling Deck – Conductor Guide Details

R51 HSD-A-JK-S-DW-2028 HSD Drilling Deck – Temporary Working Platform & Sub-cellar Deck Grating and Handrails Layout

R52 HSD-A-JK-S-DW-2029 HSD Drilling Deck – Lifting Trunnion Details

R53 HSD-A-JK-S-DW-2030 HSD Drilling Deck – Wellbay and Handrails Layout

R54 HST-A-JK-S-DW-2024 HST Drilling Deck – Framing Plans and Elevations

R55 HST-A-JK-S-DW-2025-01 HST Drilling Deck – Sections and Details – Sheet 1






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R58 HST-A-JK-S-DW-2026-01 HST Drilling Deck – Stabbing Guide Post Details – Sheet 1

R59 HST-A-JK-S-DW-2026-02 HST Drilling Deck – Stabbing Guide Post Details – Sheet 2

R60 HST-A-JK-S-DW-2027 HST Drilling Deck – Conductor Guide Details

R61 HST-A-JK-S-DW-2028 HST Drilling Deck – Temporary Working Platform & Sub-cellar Deck Grating and Handrails Layout

R62 HST-A-JK-S-DW-2029 HSD Drilling Deck – Lifting Trunnion Details

R63 HST-A-JK-S-DW-2030 HST Drilling Deck – Wellbay and Handrails Layout

2.2.6. Drawings – Subsea Wellhead Template

R64 HSD-A-JK-S-DW-1050 HSD Jacket – Subsea Docking Piles Guide Framing

R65 HSD-A-JK-S-DW-1051 HSD Jacket – Subsea Docking Piles Guide Details

R66 HSD-A-JK-S-DW-1060 HSD Jacket – Subsea Wellhead Template – Arrangement

R67 HSD-A-JK-S-DW-1061-01 HSD Jacket – Subsea Wellhead Template – Section & Details – Sheet 1



R70 HSD-A-JK-S-DW-1062 HSD Jacket – Subsea Wellhead Template Docking Pile – Details

R71 HSD-A-JK-S-DW-1063 HSD Jacket – Subsea Wellhead Template Docking Pile – Painting & Marking

2.2.7. Other References

R72 GEN-S-A-JK-S-PR-0024 General Field Layout

R73 HSD-A-JK-W-RP-1002 HSD Jacket Weight Control Report

R74 HSD-A-JK-W-RP-2002 HSD Topside Weight Control Report

R75 HST-A-JK-W-RP-1002 HST Jacket Weight Control Report

R76 HST-A-JK-W-RP-2002 HST Topside Weight Control Report

R77 C50671/5979/R3 Rev. 3, 11-03-2011 Metocean Design Criteria – Block 15-2/01 Offshore Vietnam

2.3. Contractor Documents and References

2.3.1. Calculation – Mooring Analysis

R78 GEN-S-A-JK-S-CA-0009 Rev. G01 HSD and HST Jacket – Castoro Otto Mooring Analysis for Jacket Installation

2.3.2. Calculation – Jacket Pile Analysis

R79 HSD-S-A-JK-S-CA-0011 Rev. G01 HSD Jacket – Piles Drivability Analysis

R80 HSD-S-A-JK-S-CA-0012 Rev. G01 HSD Jacket – Piles Handling Analysis

R81 HST-S-A-JK-S-CA-0037 Rev. G01 HST Jacket – Piles Drivability Analysis

R82 HST-S-A-JK-S-CA-0038 Rev. G01 HST Jacket – Piles Handling Analysis




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2.3.3. Calculation – Transportation & Seafastening Analysis

R83 HSD-S-A-JK-S-CA-0014 Rev. G01 HSD Jacket – Transportation Analysis (Barge Strength, Stability and Bollard Pull Analysis)

R84 HST-S-A-JK-S-CA-0015 Rev. G01 HST Jacket – Transportation Analysis (Barge Strength, Stability and Bollard Pull Analysis)

R85 GEN-S-A-ST-S-CA-0016 Rev. G01 Subsea Wellhead Template Seafastening Design Report

R86 HSD-S-A-JK-S-CA-0019 Rev. G01 HSD Jacket – Grillage & Seafastening Design

R87 HST-S-A-JK-S-CA-0020 Rev. G01 HST Jacket – Grillage & Seafastening Design

R88 GEN-S-A-JK-S-CA-0021 Rev. G01 HSD and HST Jacket – Piles, Appurtenances Seafastening Design

R89 GEN-S-A-JK-S-CA-0070 Rev. G01 HSD and HST Piles – Transportation Analysis (barge Strength, Stability and Bollard Pull Analysis)

2.3.4. Calculation – HST and HST Jacket Analysis

R90 HSD-S-A-JK-S-CA-0024 Rev. G01 HSD Jacket – Upending Analysis

R91 HST-S-A-JK-S-CA-0025 Rev. G01 HST Jacket – Upending Analysis

2.3.5. Calculation – Installation Aids Analysis

R92 GEN-S-A-JK-S-CA-0028 Rev. G01 HSD and HST Jacket – Installation Aids Design

2.3.6. Calculation – Transportation & Seafastening Analysis

R93 HSD-S-A-JK-S-CA-0030 Rev. G01 HSD Jacket – Rigging Design

R94 HST-S-A-JK-S-CA-0031 Rev. G01 HST Jacket – Rigging Design

R95 GEN-S-A-JK-S-CA-0032 Rev. G01 HSD and HST Jacket – Piles Rigging Design

R96 GEN-S-A-JK-S-CA-0033 Rev. G01 HSD and HST Jacket – Boatlanding, Drill Deck Rigging Design

R97 GEN-S-A-ST-S-CA-0036 Rev. G01 Subsea Well Head Template Rigging Design

2.3.7. Drawing – Installation Aids Drawings

R98 GEN-S-A-TS-S-DW-0022 Rev. G01 HSD and HST Jacket Tugger Bollards General Arrangement & Details

R99 GEN-S-A-JK-S-DW-0023 Rev. G01 HSD and HST Jacket – Ballerina Platform General Arrangements & Details

R100 GEN-S-A-JK-S-DW-0024 Rev. G01 HSD and HST Jacket – Leveling System Arrangements & Details

R101 GEN-S-A-JK-S-DW-0025 Rev. G01 HSD and HST Jacket – Temporary Working Platform & Access Ladder Details

R102 GEN-S-A-JK-S-DW-0026 Rev. G01 HSD and HST Jacket – Transition Piece Guide Frame Details

R103 GEN-S-A-JK-S-DW-0027 Rev. G01 HSD and HST Piles Fit Up and Arrangement Details

2.3.8. Drawing – Transportation and Seafastening Drawings

R104 HSD-S-A-JK-S-DW-0030 Rev. G01 HSD – Transportation Layout on Cargo Barge

R105 HSD-S-A-JK-S-DW-0064 Rev. G01 HSD – Jacket, Piles, Appurtenances Seafastening Details

R106 HST-S-A-JK-S-DW-0031 Rev. G01 HST – Transportation Layout on Cargo Barge




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R107 HST-S-A-JK-S-DW-0065 Rev. G01 HST – Jacket, Piles, Appurtenances Seafastening Details

R108 GEN-S-A-JK-S-DW-0032 Rev. G01 HSD and HST Jacket – Piles & Materials Transportation Layout on Cargo Barge

R109 GEN-S-A-JK-S-DW-0043 Rev. G01 HSD and HST Jacket – Piles & Materials Seafastening Details

2.3.9. Drawing – Rigging and Arrangement Drawings

R110 HSD-S-A-JK-S-DW-0035 Rev. G01 HSD Jacket – Horizontal Lifting & Upending Rigging Arrangement Details

R111 HST-S-A-JK-S-DW-0036 Rev. G01 HST Jacket – Horizontal Lifting & Upending Rigging Arrangement Details

R112 HSD-S-A-JK-S-DW-0037 Rev. G01 HSD Jacket – Piles Lifting Rigging Arrangement

R113 GEN-S-A-JK-S-DW-0038 Rev. G01 HSD and HST Piles Rigging Arrangement Layout

R114 HST-S-A-JK-S-DW-0039 Rev. G01 HST Jacket – Piles Lifting Rigging Arrangement

R115 GEN-S-A-JK-S-DW-0040 Rev. G01 HST and HST Jacket and Appurtenances Rigging Arrangement Layout

R116 GEN-S-A-JK-S-DW-0041 Rev. G02 HST and HST Jacket – Appurtenances Lifting Rigging Arrangement

R117 GEN-S-A-ST-S-DW-0042 Rev. G01 Subsea Template Lifting Rigging Arrangement

2.3.10. Drawing – Offshore Installation Drawings

R118 HSD-S-A-JK-S-DW-0045 Rev. G01 HSD Jacket – Castoro Otto Mooring Pattern For Jacket Installation

R119 HST-S-A-JK-S-DW-0046 Rev. G01 HST Jacket – Castoro Otto Mooring Pattern For Jacket Installation

R120 HSD-S-A-JK-S-DW-0049 Rev. G01 HSD Jacket – Pile Marking Detail Drawing

R121 HST-S-A-JK-S-DW-0050 Rev. G01 HST Jacket – Pile Marking Detail Drawing

R122 HSD-S-A-JK-S-DW-0051 Rev. G01 HSD Jacket – Pile Installation Sequence

R123 HST-S-A-JK-S-DW-0052 Rev. G01 HST Jacket – Pile Installation Sequence

R124 HSD-S-A-JK-S-DW-0053 Rev. G01 HSD Jacket – Jacket Installation Sequence

R125 HST-S-A-JK-S-DW-0054 Rev. G01 HST Jacket – Jacket Installation Sequence

R126 HSD-S-A-JK-S-DW-0055 Rev. G01 HSD Jacket – Boatlanding Installation Sequence

R127 HST-S-A-JK-S-DW-0056 Rev. G01 HST Jacket – Boatlanding Installation Sequence

R128 HSD-S-A-JK-S-DW-0059 Rev. G01 HSD Jacket – Drill Deck Installation Sequence

R129 HST-S-A-JK-S-DW-0060 Rev. G01 HST Jacket – Drill Deck Installation Sequence

R130 HSD-S-A-JK-S-DW-0061 Rev. G01 HSD Jacket – Subsea Wellhead Template Installation Sequence

R131 HSD-S-A-ST-S-DW-0062 Rev. G01 HSD Subsea Template – Docking Piles Installation Sequence

2.3.11. Other References

R132 INT-GEN-S-A-00-JK-PR-0001 Rev. A1 HSD & HST– Pre-sailaway Checklist

R133 GEN-S-A-00-S-PR-0042 Rev. B1 Saturation Diving Subsea Installation Procedure

R134 GEN-S-A-00-S-PR-0041 Rev. B1 Diving Project Plan




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2.4. Sub-Contractor Documents and References

R135 GEN-S-A-00-S-PR-00002 Rev. G01 ROV Procedures

2.5. Units

All information presented herein adopts the International System of Units (SI).




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3. GENERAL INFORMATION

3.1. HST and HSD WHP Brief Description

3.1.1. HST WHP Platform

HST Jacket

Structural type 4 legged, steel frame jacket Legs A = double batter (1 / 7.0711) Legs B = single batter (1 / 10)

Mudmat elevation EL(-) 45.130 m, plan size = 23.026 x 19.513 m2

Top bracing elevation

EL(+) 6.500 m, plan size = 14.350 x 12.700 m2

Top of leg elevation EL(+) 8.000 m

Jacket dry/operating weight

976.8 t (excluding installation aids), Ref. R75 Rev. G03

Jacket lifting weight (in air condition)

Static Hook Load = 880.1 t, Dynamic Hook Load = 1056.1 t

Predicted maximum hook load during upending


Foundation system Pile 54” x (25.4 to 50.8 mm WT) driven through the 4 legs until 88.000 m for Row-A and Row-B. Each set of piles are made of 4 sections with the range weight is 37.75 t to 54.41 t.

Jacket deployment method

Lifting off cargo barge is with single hook with 4 lifting points

Jacket upending method

Upending is performed with utilized double hook after lift off from barge.

Miscellaneous appurtenances to be installed:

4 sets of crown shims and transition pieces

2 sets of boatlanding at Jacket Row-1 and Row-2

1 no of drill deck

Note: All elevations are referenced to LAT (LAT is -0.67m with reference to MSL).

HST Drill Deck

Stabbing point elevation

El. (+) 12.000 m

Drill deck elevation El. (+) 21.000 m

Drill weight 119.76 t and 132.18 t are the operating net an gross weight, respectively; Ref. R76 Rev. G05.

Note: All elevations are referenced to LAT.

3.1.2. HSD WHP Platform

HSD Jacket

Structural type 4 legged, steel frame jacket Legs A = double batter (1 / 7.0711) Legs B = single batter (1 / 10)




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Mudmat elevation EL(-) 42.130 m, plan size = 22.426 x 19.213 m2

Top bracing elevation

EL(+) 6.500 m, plan size = 14.350 x 12.700 m2

Top of leg elevation EL(+) 8.000 m

Jacket dry/operating weight

914.5 t (excluding installation aids), Ref. R73 Rev. G03

Jacket lifting weight (in air condition)


Predicted maximum hook load during upending


Foundation system Pile 54” x (25.4 to 50.8 mm WT) driven through the 4 legs until 83.000 m for Row-A and Row-B. Each set of piles are made of 4 sections with the range weight is 34.75 t to 51.35 t.

Jacket deployment method

Lifting off cargo barge is with single hook with 4 lifting points

Jacket upending method

Upending is performed with utilized double hook after lift off from barge.

Miscellaneous appurtenances to be installed:

Subsea template and docking piles before jacket installation

4 sets of crown shims and transition pieces

2 sets of boatlanding at Jacket Row-1 and Row-2

1 no of drill deck


HSD Drill Deck

Stabbing point elevation

El. (+) 12.000 m

Drill deck elevation El. (+) 21.000 m

Drill weight 124.70 t and 149.74 t are the operating net an gross weight, respectively; Ref. R74 Rev. G04.


3.2. Field Location

The two wellhead platform, HST platform and HSD platform, target location is presented in Table 3-1. H1 WHP presented as reference only. The data are extracted from Ref. R72. For HSD Jacket, the location is fixed by existing two wellheads.

Table 3-1 – Platform Location

Facility

Coordinate

Design Existing

UTM Geodetic UTM Geodetic

HSD-1X WHP

825 135.800 mE 1 116 504.600 mN

107 57’ 58.42” E 10 05’ 13.14” N

825 135.320 mE 1 116 500.320 mN

107 57’ 58.41” E 10 05’ 13.00” N




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Facility

Coordinate

Design Existing

UTM Geodetic UTM Geodetic

HSD-5X WHP

825 132.260 mE 1 116 504.600 mN

107 57’ 58.31” E 10 05’ 13.14” N

825 132.060 mE 1 116 500.750 mN

107 57’ 58.30” E 10 05’ 13.01” N

HST WHP 823 663.000 mE

1 107 825.000 mN 107 57’ 07.53” E 10 00’ 31.34” N

- -

H1 WHP 824 500.000 mE

1 105 200.000 mN 107 57’ 34.22” E 09 59’ 05.74” N

- -

Note: 1) UTM coordinates are based on Datum WGS84, Spheroid WGS84, UTM Zone 48, Northern Hemisphere, Central Meridian (CM) 105o E

2) HSD Jacket location will be constrained by two existing wellhead. 3) HST coordinate reference is centerline of conductor slot #5

3.3. Jacket Installation Tolerances

In accordance with the jacket installation tolerance specification, the jacket shall be placed with the level tolerance of 1:200 across the jacket legs in any one direction.

3.4. Site Metocean

Jacket installation are expected to commence in between July to August. The prevailing seastate, 1-year return period, for the above months are depicted as presented in Figure 3-1. Detailed metocean data can be referred to Ref. R74.

Figure 3-1 – Wave Rose for July to September

3.5. Environmental Limit

Prior to operation, weather forecast provided daily and actual site condition will be re-evaluated by Superintendent in liaison with Captain, COMPANY, MWS representative and relevant SUB-




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CONTRACTOR(s) in order to decide whether it is safe for execution of particular works considering any hazard involved.

Weather forecast (minimum at 12 hours interval) shall be received prior to start jacket and topside lifting until the operation is deemed complete.

3.6. General Weather Criteria for Castoro Otto Operation

General weather limit for Castoro Otto operations are detailed hereafter (Ref. Table 3-2), however actual operability limit might be different based on sea state period and direction. Actual execution of any activity is at Castoro Otto Superintendent and Captain discretion in order to ensure at any time safety for crew vessel and assets.

Table 3-2 – General Weather Criteria for Castoro Otto Operation

Operation Hs Wind Speed

Anchor Handling 2.0 m 30 knots (15.43 m/s)

Barge Mooring 1.5 m 25 knots (12.86 m/s)

Heavy Lifting ( > 300 t) 1.0 m 20 knots (10.29 m/s)

Loading from Cargo barge 2.0 m 25 knots (12.86 m/s)

3.7. Castoro Otto Mooring Capability

It has been asssesed that Castoro Otto mooring confirguration is able to withstand the following seastate as per Ref. R78:

Significant wave height, Hs = 2.00 m

Zero crossing period, Tz = 7 s

Mean wind speed, U60 = 10.00 m/s

Current speed @ water surface = 0.86 m/s

Water depth = 42.130 m (HSD site) and 45.130 m (HST site)

NOTE: Weather scenario adopted in the mooring analysis are in accordance with DnV OS-E301, using non-collinear environmental loading, where wind and current are assumed to be acting in 30 deg and 40 deg relatives to the wave respectively.

3.8. Specific Weather Constraint for Jacket Installation

Should adverse weather waiting, Castoro Otto for short duration may postpone specific works (related to/affected by activities listed in Table 3-2) and stand-by until the favorable weather conditions are in place.




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4. JACKET PRE-INSTALLATION

4.1. Pre-sailaway Check List

Before barge sailaway, there is a pre-sailaway check list that to be completed. Refer to R132 for detailed checklist.

4.2. Marine Spread

Table 4-1 describes marine spread that will be utilized for the HSD and HST Transportation and Installation.

Table 4-1 – Marine Spread

Convoy No.

Towing Tug / Vessel Cargo Barge Designation

Name BHP Bollard Pull Name Size

1 ENA PHOENIX

5000

71 t New Cruz 331

330’ x 100’ x 20’

Transportation of:

* HSD Jacket (1 nos)

* HSD Boatlanding (2 nos)

* HSD Drill Deck (1 no)

* HSD Transition Piece (4 nos)

* HSD Crown Plates (24 nos)

* HSD Subsea Template (1 no)

* HSD Docking Pile (2 nos)

2 ENA MONARCH

4000 59 t Kreuz 284 282’ x 90’ x 18’

Transportation of:

* HST Jacket (1 nos)

* HST Boatlanding (2 nos)

* HST Drill Deck (1 no)

* HST Transition Piece (4 nos)

* HST Crown Plates (24 nos)

3 OCEAN CENTURY

3200 44.9 t SAL Draco 282’ x 90’ x 18’

Transportation of:

* HSD Piles (16 nos)

* HST Piles (16 nos)

Note: The minimum BHP’s are then estimated with empiric equation: BHP 100 x BP.

4.3. Transportation

4.3.1. Bollard Pull Requirement

Table 4-2 presents bollard pull requirement that extracted from Ref. R83, R84 and R89 for HSD jacket, HST Jacket and HSD & HST Piles.




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Table 4-2 – Bollard Pull

Convoy No.

Cargo Barge Bollard Pull Reference Minimum Towing

Tug BHP

1 New Cruz 331 60 t Ref. R83 6000

2 Kreuz 282 50 t Ref. R84 5000

3 SAL Draco 30 t Ref. R89 3000

Note: The minimum BHP’s are then estimated with empiric equation: BHP 100 x BP.




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5. JACKET INSTALLATION SEQUENCE

Table 5-1 presents the Jacket and appurtenances installation sequence in a general perspective. Specific section that detailing step by step of particular main activity is written under dedicated Section on remark column. The installation sequences are applicable for HSD Jacket and HST Jacket with differences that described later on.

Table 5-1 – General Jacket Installation Sequence

Sequence Main Activity Remark or Reference

1. Jacket pre-installation debris-free survey Section 5.1

2. Castoro Otto preparation for jacket installation Section 5.2

3. Subsea template and docking pile installation Not applicable for HST Jacket since Subsea Template only for HSD (Ref. R66).

4. Jacket lifting operation Jacket cargo barge mooring alongside Castoro Otto starboard side Jacket pre-lifting inspection Jacket rigging rig-up and seafastening cutting Jacket lifting off cargo barge

Section 5.3.3 Section 5.4.1 Section 5.4.2 Section 5.4.3 Section 5.4.4

5. Jacket upending and set down Section 5.4.5

6. Pile installation Section 5.5

7. Jacket leveling Section 5.5.5

8. Crown plate installation Section 5.5.5

9. Pile final cut-off Section 5.5.5

10. Transition piece installation and final cut-off Section 5.8

11. Boatlanding installation Section 5.10

12. Drilling deck installation Section 5.11

13. Miscellaneous activities Flooding legs and removal flooding system Removal of closure plate on top of jacket leg Post installation survey Removal installation aids on the Jacket Offshore install jacket appurtenances

Section 5.12 Section 5.12.1 Section 5.12.2 Section 5.12.5 Section 5.12.3 Section 5.12.4

5.1. Jacket Pre-installation Survey

It is required to perform a debris visual survey on the jacket installation area. Such survey is carried out by means of Sonar system performed by Installation Contractor with ROV prior jacket barge mooring.

A detailed description of the survey can be found in the Ref. R135.

The purpose of the survey is to ensure that the jacket location is free from any obstructions or debris (cement, scrap metal, localized outcrops, etc). In case of presence of debris that may/will jeopardize the




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Jacket installation, ROV supervisor, Castoro Otto Superintendent and COMPANY representative will on the most suitable procedure to remove the debris.

All subsea survey will be video-taped and presented to Company as part of as built documents.

5.2. Castoro Otto Preparation for Jacket Installation

Table 5-2 – Castoro Otto Preparation for Jacket Installation


1. Ensure Company approval of jacket seabed location and cleanliness.

2. Prepare JSA and permits for starting operations.

3. Confirm environment conditions are suitable to commence jacket installation and the weather window, refer to forecast, is suitable for duration of the activity.

Section 3.5, 3.6; Site weather forecast.

4. Prepare mooring lines, spacers and fenders.

5. Confirm anchor spread is fully operational.

6. AHT is ready to perform mooring deployment

7. Position and moor Castoro Otto stand-off position approximately 150 m east of jacket target location while Castoro Otto is heading to platform north. Test Castoro Otto anchoring system.

Ref. R118 and R119

8. Confirm Sub-contractors have set-up their equipments and ready for the work: Survey and positioning services ROV services Air diving services Pile monitoring Menck hammer control Welding and NDT

9. Ensure all equipment/materials required for the operation are available and layout on Castoro Otto deck is correct.

10. Rig up the following main spreads and ensure that the system work properly: Piling system (hammer, power pack and reeling unit) ILT system (ILT unit and power pack) Jacket leveling system (power pack, jacks and reeling unit) Note: functional test of equipments are also to be performed onshore prior mobilization.

11. Ballast Castoro Otto for heavy lift draught. Ballast arrangement will be decide by Castoro Otto Captain at site in order to optimized the vessel stability throughout operation. This will consider the actual sea-state condition, existing fluid level in tanks and lifting steps of the jacket. Install two units 7.5 m fender system at Castoro Otto starboard side.




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5.3. Subsea Wellhead Template Installation

5.3.1. Subsea Template Leveling

Table 5-3 – Subsea Template Leveling


1. Prepare sand bag and deploy to template footprint.

2. Deploy diver to seabed

3. Put necessary sand bag at subsea template footprint

5.3.2. Subsea Wellhead Template and Docking Pile Installation and Pile Frame Removal

Table 5-4 – Subsea Wellhead Template and Docking Pile Installation and Pile Frame Removal


Subsea Template Installation

1. Confirm main tow tug and barge are ready for berthing operations.

2. Confirm AHT is ready in field and briefed on operational requirements.

3. Deploy marine crew to Cargo Barge by work boat. Marine crew to assist handling of tugger lines as required.

4. Connect tugger lines from AHT to Cargo Barge.

5. With AHT assistance, manoeuvre Cargo Barge along Castoro Otto portside with Cargo Barge stern to Castoro Otto bow.

Ref. R130

6. Once cargo barge is at suitable distance alongside Castoro Otto, pass mooring lines from Castoro Otto to Cargo Barge and secure the barge at Castoro Otto portside.

Ref. R130

7. Check suitability of weather condition

8. Connect subsea template pre-rigged lifting grommet to Auxiliary hook of Castoro Otto Clyde crane.

Ref. R130, R117

9. Perform cutting of subsea template seafastening. Working crews to move away at safe distance. Lift subsea template above cargo barge to have clearance.

Ref. R130

10. Swing crane in counter clockwise direction and position subsea on starboard side.

11. Submerge subsea template and lower it until near seabed.

12. Deploy ROV to monitoring the subsea template set down.




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13. Stab subsea template onto existing predrilled wellhead (i.e. conductor/DMR) and set down it. The following existing well head coordinates will be taken as reference:

Description Easting (m) Northing (m) HSD-1x 825135.32 1116500.32 HSD-5x 825132.06 1116500.75

Lifting and stabbing of the subsea wellhead template over the wells will be monitored by ROV. Transponders on the subsea wellhead template will give position and ROV will provide the video. ROV will provide video while stabbing the subsea wellhead template over the wells. In order to guide the subsea wellhead template deployment into the right position and orientation, survey equipment will identify and continuously monitor the location of HSD-1x and 5x as reference.

14. Slack the rigging and check the subsea wellhead template levelness by monitoring the bull eyes on it. In addition to the bull eye the divers can perform additional level checks with spirit level in other corner of the subsea wellhead template. In case of severe out of levelness than subsea wellhead template will be lifted and divers to recover the out of levelness with additional sand bags or removing some. Note: If the subsea template is not level then procedure in Section 5.3.1 need to be proceed.

Ref. R130, Section 5.3.1

15. Cut sacrificial sling as per Ref. R117 by ROV. Recover Auxiliary hook to Castoro Otto deck for next operation.

Ref. R130, R117

Docking Pile Installation (by Castoro Otto)

16. Cut docking piles seafastening. Ref. R105 (sheet-1, 8) R131

17. Rig-up Clyde Crane Auxiliary hook with ILT and insert ILT to top of docking pile-1.

Ref. R131

18. Rig-up Gantry crane hook to pre-rigged chocker sling on bottom of docking pile-1.

19. Raise Auxiliary hook and Gantry crane hook simultaneously to have clearance between cargo barge on to Castoro Otto deck.

20. Move Gantry crane to Clyde crane and maintain Gantry crane hook elevation. Meanwhile, simultaneously raise Whip hook until docking pile in vertical position.

21. Slack rigging on Gantry crane and recover rigging from docking pile.

22. Rotate Clyde crane until the pile on top of subsea template position.

23. Submerge docking pile until reach approximately 5.0 m from subsea template.




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24. Insert docking pile onto respective slot. Let the docking pile self-penetration. The modified shims on the guide cone will ensure that pile is satisfactorily vertical and in within jacket receiver cone. Therefore, once pile is in self-penetration it will always be in within tolerance of verticality. Note: ROV is monitoring the process.

25. Release ILT from docking pile and recover ILT to Castoro Otto deck.

26. Rig-up MHU150S rigging to Auxiliary hook.

27. Swing Clyde crane, lower the hammer and insert to docking pile. Note: ROV is monitoring the process.

28. Drive docking pile until target penetration.

29. Recover hammer on board Castoro Otto.

30. Redo sequence 16 to 30 for docking pile-2. Note: After the second Pile has been fully driven, then location and distance of the top of the two piles needs to be measured and recorded to ensure piles are installed within tolerances to allow for proper jacket installation stab-over. This will be done by the divers assistance.

31. The divers cut hole for docking pin and then insert the docking pin Section 5.3.3

Pile Frame Removal (by DSV)

32. Deploy diver to near subsea template.

33. Remove DMR sleeve Note: HSD-1x : 18 x 24 mm bolts HSD-5x : 4 x 24 mm bolts

Ref. R71

34. Diver removes bolts on flange connection between pile frame and bottom frame. Note: 4 x 30 mm bolts on 4 connections.

Ref. R67

35. Rig-up subsea template rigging for recovery to crane main hook. Ref. R117, R131

36. Swing and lower rigging to seabed.

37. Diver to connect rigging on subsea template (i.e. master link) to recovery rigging.

38. Raise hook to lift pile frame from base frame and recover to DSV deck.

39. Recover diver to DSV deck

Docking Pile “Bullet” Installation (by Castoro Otto)

40. Rig-up Auxiliary hook to docking pile “bullet” by using subsea template rigging arrangement.

Ref. R131

41. Lift and lower it to seabed.

42. Insert docking pile bullet to top of pile. Note: ROV to monitor the insertion process.

43. ROV hold the ROV friendly hook and open the latch. Pull the hook outside the “bullet” lifting handle.




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44. Recover Auxiliary hook and repeat step 39 to 42 for other “bullet” for next docking pile.

45. Docking piles are ready for Jacket installation Section 5.3.3

5.3.3. Drilling Docking Pile and Pin Insertion

Table 5-5 – Drilling Docking Pile and Pin Insertion


1. Prepare Broco equipments and pile locking pin. Deploy it to near subsea template.

Ref. R68, Ref. R133

2. Deploy divers to subsea wellhead template.

3. Cut holes on subsea template until through the docking pile at two locations on each docking pile.

Ref. R67, R68, Ref. R133

4. Insert the pile locking pin through the holes. Diver cut the pile locking pin extension.

Ref. R67, R68, Ref. R133

5. Recover diver and equipment to Castoro Otto.

5.4. Jacket Lifting, Upending and Set-down Operation

5.4.1. Mooring of Jacket Cargo Barge alongside Castoro Otto

Table 5-6 – Mooring of Jacket Cargo Barge alongside Castoro Otto


1. Confirm main tow tug and barge are ready for berthing operations.

2. Confirm AHT is ready in field and briefed on operational requirements.

3. Deploy marine crew to Cargo Barge by workboat. Marine crew to assist handling of tugger lines as required.

4. Connect tugger lines from AHT to Cargo Barge.

5. With AHT assistance, manoeuvre Cargo Barge along Castoro Otto starboard with Cargo Barge stern to Castoro Otto stern.

6. Once cargo barge is at suitable distance alongside Castoro Otto, pass mooring lines from Castoro Otto to Cargo Barge and secure the barge at Castoro Otto Starboard side.

Ref. R124, R125




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5.4.2. Jacket Pre-Lifting Inspection

Table 5-7 – Jacket Pre-Lifting Inspection


1. Once the jacket is safely secured, install gangway to connect Castoro Otto deck to Cargo Barge. Note: Gangway will be re-inspected prior usage.

2. Scaffolding tower around seafastening of Jacket/Boatlanding/Drill Deck for cutting access need to be re-inspected and certified by qualified Safety Officer or competent personnel.

3. MWS, CONTRACTOR & COMPANY to perform jacket pre-lifting inspection. Ensure cargo barge and all cargoes are intact and in good condition. Pay particular attention to the following items: All temporary platforms and walkways are secured as per design drawings. All riggings and tugger lines are installed with dimension and location as

per design drawing.

Ref. R101 Ref. R98, R110, R111

4. Re-ensure weather forecast window are suitable for lifting operation. Section 3.5, 3.6; Site weather forecast.

5. Obtain Approval from MWS and COMPANY to commence jacket seafastenings cutting and further jacket lifting preparation.

5.4.3. Jacket Rigging Rig-up and Seafastening Cutting

Table 5-8 – Jacket Rigging Rig-up and Seafastening Cutting


1. Upon MWS, CONTRACTORS & COMPANY Approval, perform the below Activity 2 to 10 in parallel.

2. Connect jacket tugger and mooring lines to Castoro Otto as per design drawing.

Ref. R124, R125

3. Set Castoro Otto Clyde Crane at sufficient height over the Jacket Horizontal Rigging Rig up lifting slings to Clyde crane Main Hook at two opposite prong. Raise

the hook to a suitable elevation but still maintaining slings slack.

Ref. R110 (sheet-1), R111 (sheet-1)

4. Set Castoro Otto Clyde Crane at sufficient height over the Jacket Upending Rigging Rig up lifting slings to Clyde crane Auxiliary Hook at two opposite prong.

Raise the hook to a suitable elevation but still maintaining slings slack.

Ref. R110( sheet-2), R111 (sheet-2)

5. Ensure the riggings are slack and not entangled/twisted and has enough clearance to jacket.

6. Cut seafastenings at dedicated offshore cutting lines at El. (-) 42.130 m and El. (-) 8.000 m of Leg-B1 and Leg-B2 1)

Ref. R105 (sheet-4, 5, 6, 7), R107 (sheet-4, 5, 6, 7)

7. Set Castoro Otto Clyde Crane in Fixed Mode

8. Raise Main hook and tension up to 100 t to recover slack on the main slings.




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9. Cut seafastenings at dedicated offshore cutting lines at El. (-) 26.500 m of Leg-B1 and Leg-B2 1)

Ref. R104 sheet-1/2, R106

10. All cut seafastening/grillage members and cutting tools to be properly secured to the cargo barge deck to prevent any loss at sea.

Note: 1) Before cutting the gusset plate, ensure Ø60 temporary support pipe is properly installed Ref. R105 (sheet-10, 11, 12) and R107 (sheet-10, 11, 12).

5.4.4. Jacket Lifting Off Cargo Barge

Table 5-9 – Jacket Lifting Off Cargo Barge and Upending


1. Raise Main Hook of the Castoro Otto Clyde Crane gradually to increase the tension in the horizontal lifting slings. Keep upending sling attached on Auxiliary Hook in slack condition. This operation shall be carried in parallel with the adjustment of Castoro Otto ballast pattern if and as required by Castoro Otto Master.

HLV stability parameter (e.g. heel, trim) and Crane parameter (boom reach, loading, etc) can be monitored from the HLV Bridge.

2. Connect first AHT to bow of Cargo Barge and the second AHT to the stern of Cargo Barge.

Ref. R124, R125

3. Perform final check to see if the Jacket is completely free from seafastening connection to the cargo barge.

4. Marine crews stand-by on cargo barge for handling/controlling of mooring lines.

Ref. R124, R125

5. Raise Main Hook and lift Jacket to suitable clearance (approx. 5.0 m) from jacket seafastening. Dynamic Hook Load = 999.6 t (HSD Jacket). Dynamic Hook Load = 1056.1 t (HST Jacket). Once clearance from cargo barge is achieved, unmoor Cargo Barge from Castoro Otto and relocate her to the Castoro Otto portside for next scope.


6. Lower Jacket into the water, until the jacket is approximately half submerged. Keep the Main Hook at elevation (+) 50.7 m.


7. Rotate Jacket 90 counterclockwise.

8. Deploy ROV for upending operation assistance to monitor clearance Jacket and seabed.

9. Raise Auxiliary Hook gradually to increase the tension in the upending lifting slings. Keep Main Hook elevation and check clearance for upending sling to Jacket.

10. Raise Auxiliary Hook until Jacket reach 20 pitch angle. Keep Main Hook elevation. Main Hook: Dynamic Hook Load = 315.6 t (HSD Jacket). Auxiliary Hook: Dynamic Hook Load = 294.0 t (HSD Jacket). Main Hook: Dynamic Hook Load = 258.1 t (HST Jacket). Auxiliary Hook: Dynamic Hook Load = 309.1 t (HST Jacket).





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11. Raise Auxiliary Hook and decrease Main Hook simultaneously until Jacket in vertical position. Keep monitor Jacket clearance and seabed by ROV. Main Hook: Maximum Dynamic Hook Load = 0.0 t (HSD Jacket). Auxiliary Hook: Maximum Dynamic Hook Load = 392.4 t (HSD Jacket). Main Hook: Maximum Dynamic Hook Load = 0.0 t (HST Jacket). Auxiliary Hook: Maximum Dynamic Hook Load = 375.1 t (HST Jacket).


12. Release horizontal lifting shackle by connects power pack to pre-install hydraulic hose and raise Main Hook. Use tugger line from crane boom to avoid shackle crash Jacket.


13. Rotate Jacket 90 counterclockwise. Ref. R124 (sheet-4), R125 (sheet-4)

14. Move Castoro Otto to final set down location

5.4.5. Jacket Set Down

Table 5-10 – HSD Jacket Set Down


1. Deploy ROV to monitoring Jacket set down.

2. Set Auxiliary Hook radius approximately on top of docking pile. Ref. R124 (sheet-4)

3. Lower Auxiliary Hook to have pre-installed docking pile through Jacket docking piles guide until Jacket set down on seabed. Note: Stabbing process is monitored by ROV.

Ref. R124 (sheet-4), Section 5.3

4. Slack upending rigging and dismantle upending shackles.

5. Flood Jacket legs by operating reach rods. Note: Flooding jacket leg is based on Ref. R90.

Ref. R04, R90, Section 5.12.1

6. Recover lifting rigging by releasing hydraulic shackle.

7. Surveyor to perform and record jacket level

Table 5-11 – HST Jacket Set Down


1. Deploy ROV to monitoring Jacket set down.

2. Deploy positioning personnel to Jacket by accessing ladder. Ref. R101

3. Personnel to come back to Castoro Otto

4. Rotate Jacket to adjust the Jacket heading and adjust Auxiliary Hook and boom radius for jacket position.

Ref. R125 (sheet-4)

5. Lower Auxiliary Hook until Jacket set down on seabed. Note: Set down process is monitored by ROV.

Ref. R125 (sheet-4), Section 5.3




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6. Slack upending rigging and dismantle upending shackles.

7. Flood Jacket legs by operating reach rods. Note: Flooding jacket leg is based on Ref. R91.


8. Recover lifting rigging by releasing hydraulic shackle.

9. Surveyors to check and confirm jacket location and orientation

10. Surveyors to perform and record jacket level

5.5. Pile Installation Procedure

5.5.1. Pile Installation Sequence

Main references for pile installation are Ref. R79, R80, R81, R82, R122, and R123.

Table 5-12 – Pile Installation Sequence


1. All legs Install riggings and ILT on Pile lead section (P1), handling and stabbing to correlated leg.


2. All legs Disconnect ILT, Install scaffolding Ref. R122, R123

3. All legs Install riggings and ILT on Pile 1st-add on section (P2), handling, stabbing to correlated P1, and remove ILT. Note: the pile stabbing guides have been verified in document Ref. R92 and found satisfactorily to hold pile section self-weight upon pile completely stabbed hence ILT can be removed. Furthermore, in accordance with drawing Ref. R103 there will be also pile fit up arrangement to adjust the piles prior welding.


4. All legs Weld aligning padeye, install turn buckle, fit-up section P2 to P1, weld and perform NDT.


5. All legs Remove turn buckle, cut aligning padeye, grind flush, remove scaffolding, insert ILT, lift P2-P1, cut P1 pile stopper, grind flush, perform NDT, and set P2-P1 for self-penetration.

6. All legs Drive P2-P1until intermediate penetration

7. All legs Install ballerina, cut-off P2 allowance, and perform surface weld preparation.

8. All legs Install riggings and ILT on Pile 2nd-add on section (P3), handling, stabbing to correlated P2. Once stabbed, ILT removed. Note: the pile stabbing guides have been verified in document Ref. R92 and found satisfactorily to hold pile section self-weight upon pile completely stabbed hence ILT can be removed. Furthermore, in accordance with drawing Ref. R103 there will be also pile fit up arrangement to adjust the piles prior welding.





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9. All legs Weld aligning padeye, install turn buckle, fit-up section P3 to P2, weld and perform NDT.


10. Leg A1 Remove turn buckle, cut aligning padeye, grind flush, remove ballerina and drive P3-P2-P1 until intermediate penetration.

11. Leg A1 Install ballerina, cut-off P3 allowance, and perform surface weld preparation.

12. Leg A1 Install riggings and ILT on Pile 3rd-add on section (P4), handling and stabbing to correlated P3. Once stabbed, ILT removed. Note: the pile stabbing guides have been verified in document Ref. R92 and found satisfactorily to hold pile section self-weight upon pile completely stabbed hence ILT can be removed. Furthermore, in accordance with drawing Ref. R103 there will be also pile fit up arrangement to adjust the piles prior welding.


13. Leg A1 Weld aligning padeye, install turn buckle, fit-up section P4 to P3, weld and perform NDT.


14. Leg A1 Remove turn buckle, cut aligning padeye, grind flush, remove ballerina and drive P4-P3-P2-P1 until target penetration.

15. Leg A2 Remove turn buckle, cut aligning padeye, grind flush, remove ballerina and drive P3-P2-P1 until intermediate penetration.

16. Leg A2 Install ballerina, cut-off P3 allowance, and perform surface weld preparation.

17. Leg A2 Install riggings and ILT on Pile 3rd-add on section (P4), handling and stabbing to correlated P3. Once stabbed, ILT removed. Note: the pile stabbing guides have been verified in document Ref. R92 and found satisfactorily to hold pile section self-weight upon pile completely stabbed hence ILT can be removed. Furthermore, in accordance with drawing Ref. R103 there will be also pile fit up arrangement to adjust the piles prior welding.


18. Leg A2 Weld aligning padeye, install turn buckle, fit-up section P4 to P3, weld and perform NDT.


19. Leg A2 Remove turn buckle, cut aligning padeye, grind flush, remove ballerina and drive P4-P3-P2-P1 until target penetration.

20. Leg B1 Remove turn buckle, cut aligning padeye, grind flush, remove ballerina and drive P3-P2-P1 until intermediate penetration.

21. Leg B1 Install ballerina, cut-off P3 allowance, and perform surface weld preparation.

22. Leg B1 Install riggings and ILT on Pile 3rd-add on section (P4), handling and stabbing to correlated P3. Once stabbed, ILT removed. Note: the pile stabbing guides have been verified in document Ref. R92 and found satisfactorily to hold pile section self-weight upon pile completely stabbed hence ILT can be removed. Furthermore, in accordance with drawing Ref. R103 there will be also pile fit up arrangement to adjust the piles prior welding.





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23. Leg B1 Weld aligning padeye, install turn buckle, fit-up section P4 to P3, weld and perform NDT.


24. Leg B1 Remove turn buckle, cut aligning padeye, grind flush, remove ballerina and drive P4-P3-P2-P1 until target penetration.

25. Leg B2 Remove turn buckle, cut aligning padeye, grind flush, remove ballerina and drive P3-P2-P1 until intermediate penetration.

26. Leg B2 Install ballerina, cut-off P3 allowance, and perform surface weld preparation.

27. Leg B2 Install riggings and ILT on Pile 3rd-add on section (P4), handling and stabbing to correlated P3. Once stabbed, ILT removed. Note: the pile stabbing guides have been verified in document Ref. R92 and found satisfactorily to hold pile section self-weight upon pile completely stabbed hence ILT can be removed. Furthermore, in accordance with drawing Ref. R103 there will be also pile fit up arrangement to adjust the piles prior welding.


28. Leg B2 Weld aligning padeye, install turn buckle, fit-up section P4 to P3, weld and perform NDT.


29. Leg B2 Remove turn buckle, cut aligning padeye, grind flush, remove ballerina and drive P4-P3-P2-P1 until target penetration.

Note: Sequence 10 to 29 is done to minimize set-up time and avoid refusal limit.

5.5.2. Pile Handling Sequence

Each pile string is composed of four-pile sections Ø1372 mm (54”) that can be summarized in Table 5-13.

Table 5-13 – Pile Length and Weight Data

Jacket Section

Leg-A1 and Leg-A2 Leg-B1 and Leg-B2

Length Weight Length Weight

(m) (t) (m) (t)

HSD Jacket Lead section (P1) 51.826 44.93 51.414 44.59

HSD Jacket 1st add-on (P2) 27.760 27.80 27.760 37.80

HSD Jacket 2nd add on (P3) 37.960 53.02 38.960 54.28

HSD Jacket 3rd add on (P4) 34.024 44.46 32.770 42.88

HST Jacket Lead section (P1) 54.875 47.51 54.939 47.56

HST Jacket 1st add-on (P2) 37.760 57.45 37.260 57.03

HST Jacket 2nd add on (P3) 29.710 40.68 29.710 40.68

HST Jacket 3rd add on (P4) 35.304 46.06 35.035 45.72

Note: 1) Length is measured from top of pile until end of pile or tip of stabbing guide. 2) Weight includes stabbing guide.

Horizontal lifting shall be only from cargo barge and transferred onto Castoro Otto deck.




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In order to upend the piles to upright position for stabbing into jacket leg, lead and add-on sections will be upended by following method:

Pile lead section (P1) and pile 1st add-on (P2) will be upended by utilizing double crane (Gantry crane and Clyde crane). Refer Table 5-14 for detailed sequence.

Pile 2nd add-on (P3) and pile 3rd add-on (P4) will be upended by utilizing Clyde crane and upending sled. Refer Table 5-15 for detailed sequence.

Table 5-14 – Pile Handling Sequence with Double Crane


1. On board of the cargo barge, cut seafastening of piles following the sequence of installation.

Ref. R108

2. Ensure pile pre-rigged chocker slings are correctly positioned on lifting point. Ref. R112, R114

3. Rig-up Clyde Whip hook with ILT and insert ILT to top of pile. Ref. R112, R122 (sheet-1, 2), R114, R123 (sheet-1, 2)

4. Rig-up Gantry hook to pile pre-rigged chocker sling at bottom of pile.

5. Lift-up simultaneously the pile approximately 7.5 m above barge/seafastening.

Ref. R122 (sheet-1, 2), R123 (sheet-1, 2)

6. Rotate Gantry crane and Clyde crane until the pile above the Castoro Otto deck. Note: Keep clearance between pile and Castoro Otto deck.

7. Move gantry crane to the Clyde crane and maintain gantry hook elevation. Meanwhile, simultaneously raise Whip hook until pile in vertical position.

8. Slack rigging on Gantry crane and recover rigging from pile

9. Rotate Clyde crane until the pile on top of correlated legs.

10. Stab the pile onto jacket leg or onto previous pile.

11. Release and retrieve ILT from pile.

Table 5-15 – Pile Handling Sequence with Single Crane


1. On board of the cargo barge, cut seafastening of piles following the sequence of installation.

Ref. R108

2. Ensure pile pre-rigged chocker grommets are correctly positioned on lifting point.

Ref. R112, R114

3. Rig-up transfer slings to Clyde Whip hook. Ref. R112, R122 (sheet-3), R114, R123 (sheet-3)

4. Connect transfer slings to pile pre-rigged choker grommets.

5. Lift-up the pile approximately 7.5 m above the barge/seafastening. Ref. R122 (sheet-3), R123 (sheet-3)




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6. Rotate Clyde crane until pile above the Castoro Otto deck and placed bottom part of pile on top of pile sled. Note: Keep clearance between pile and Castoro Otto deck during rotation.

7. Slack transfer riggings. Disconnect it from pile and Whip hook.

8. Rig-up Clyde Whip hook with ILT and insert ILT to top of pile.

9. Raise Whip hook and rotate Clyde crane simultaneously to upend the pile until the pile in vertical position. Note: sled might be moved during pile upending.

10. Rotate Clyde crane until the pile on top of correlated legs.

11. Stab the pile onto jacket leg or onto previous pile.

12. Release and retrieve ILT from pile.

5.5.3. Pile Fit-up

Table 5-16 – Pile Fit-up Sequence


1. Prepare fit-up equipment i.e. bullets, padeyes and turnbuckles. Ref. R103

2. Tack weld bullet to provide 11 mm gap between piles.

3. Weld padeye on previous pile for about 825 mm from top of pile.

4. Weld padeye on following pile for about 825 mm from bottom of pile.

5. Install turnbuckle and tighten it until piles have uniform gaps.

6. Perform weld and remove bullets before weld completion.

7. Perform NDT after weld completion.

8. Dismantle turnbuckle and remove padeyes.

5.5.4. Pile Driving

Pile driving will utilize MHU150S and MHU800S hammer. According to pile drivability analysis (Ref. R79 and R80), P1+P2 is driven by using MHU150S and P1+P2+P3 and P1+P2+P3+P4 is driven by using MHU800S.

The pile characteristic, section data (thickness/length), maximum stickup, and hammer usage are summarized in Table 5-17. The expected self-penetration is presented in Table 5-18. The data are extracted from Ref. R79 and R80.

The pile driving will be considered to meet the refusal limit when the blow count of 1000 bl/m is reached.

HSD Jacket Piles

Ref. R79 Section 12.2 described that there is no expected to reach refusal limit under continuous driving conditions for all pile segments. The maximum blow count is 720 bl/m and 745 bl/m for Row-A and Row-B, respectively.




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Row-A

For P3 driving under full setup conditions, hammer energy may be increased to 70% to continue driving from 42.0m to 56.0m depth, resulting in maximum blow count of 424 bl/m.

For P4 start of driving under the upper bound restart driving condition, maximum blow count is 310 bl/m. Under full setup condition, refusal may be encountered at the start of driving of P4. Thus, driving of P4 should begin immediately after the end of driving of P3 to avoid full setup conditions.

For P4 driving in upper bound restart driving condition, hammer energy can be increased to 60% to continue driving after 70.0 m up to 78.0 m depth, with maximum blow count of 690 bl/m. At 78.0m depth, refusal may be encountered under the upper bound restart driving condition. Thus, driving should be done continuously from 78.0 m to target penetration.

Row-B

For Row B piles, no refusal is expected under continuous driving conditions, with maximum blow count of 745 bl/m.

For P4 driving under lower bound restart driving conditions, hammer energy may be increased to 90% to continue driving from 78.0 m to 83.0 m depth, with maximum blow count of 553 bl/m.

Refusal may be encountered at 68.0m depth under the upper bound restart driving condition and at 62.0 m depth under the full setup conditions. Thus, driving of P4 should be done continuously to avoid the risk of refusal under these conditions.

HST Jacket Piles

Ref. R81 Section 12.2 described that there is no expected to reach refusal limit under continuous driving conditions for all pile segments. The maximum blow count is 720 bc/m and 745 bc/m for Row-A and Row-B, respectively.

For P2 and P3 driving, no refusal is expected under all restart driving conditions, with maximum blow count of 710 bl/m.

For P4 start of driving under the upper bound restart driving condition, maximum blow count is 875 bl/m. Under full setup conditions, refusal may be encountered at the start of driving of P4. Thus, driving of P4 should begin immediately after the end of driving of P3 to avoid full setup conditions.

For P4 driving under upper bound restart driving conditions, refusal may be encountered at 62.0 m depth. Thus, driving should be done continuously from 62.0 m to target penetration.

Hammer energy shall be limited during driving of all pile sections in order not to overstress the piles.

Table 5-17 – Pile Characteristic

HSD Jacket 2) HST Jacket 3)

Leg-A1 and Leg-A2

Leg-B1 and Leg-B2

Leg-A1 and Leg-A2

Leg-B1 and Leg-B2

Lead Section (P1)

Length (m) 51.826 51.414 54.875 54.939

2.0” thickness section length (m) 1.500 1.500 1.500 1.500


Cut-off allowance length (m) - - - -




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HSD Jacket 2) HST Jacket 3)

Leg-A1 and Leg-A2

Leg-B1 and Leg-B2

Leg-A1 and Leg-A2

Leg-B1 and Leg-B2

Maximum stickup (m) - - - -

Initial Penetration (m) Hangs on stoppers Hangs on stoppers Hangs on stoppers Hangs on stoppers

Hammer for Stick Up Calculation MHU150S MHU150S MHU150S MHU150S

1st add-on Section (P2)

Length (m) 24.900 24.900 34.900 34.400

2.5” thickness section length (m) - - 12.000 12.000



1.0” thickness section length (m) 4.000 4.000 - 5.500

Cut-off allowance length (m) 0.600 0.600 0.600 0.600

Maximum stickup (m) 30.125 30.125 38.625 38.125

Intermediate Penetration (m) 21.654 21.571 31.574 34.531


2nd add-on Section (P3)

Length (m) 35.100 35.100 26.850 26.850







3rd add-on Section (P4)

Length (m) 31.164 31.164 32.444 32.175



1.0” thickness section length (m) 17.414 17.160 - -





Note: 1) Weight MHU150S and MHU800S is 349.24 kN (35.6 t) and 1098.72 kN (112.1 t), respectively. 2) Data are extracted from Ref. R79 Section 10.0 and R10 & R11. 3) Data are extracted from Ref. R80 Section 10.0 and R15 & R16. 4) Pile length measured from top of pile to end of pile (excluding stabbing guide length).




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Table 5-18 – Self Weight Penetration

HSD Jacket (Row-A and Row-B) 1) HST Jacket (Row-A and Row-B) 2)

Self Penetration SRD Min

Self Penetration SRD Max

Self Penetration SRD Min

Self Penetration SRD Max

P1 + P2 12.0 m 3.0 m 9.0 m 5.0 m

P1 + P2 + MHU150S 16.0 m 4.0 m 10.0 m 6.0 m

Note: 1) Data are extracted from Ref. R79 Section 9.0. 2) Data are extracted from Ref. R80 Section 9.0.

5.5.5. Pile Re-strike Test

Pile re-strike test is performed on 1 pile after a 24 hours setup period. The length shall be 1.0 m overdrive.

5.6. Jacket Intermediate Leveling

During pile installation phase, jacket levelness will be surveyed periodically. In case the level is out of tolerances, first attempt is to modify the pile installation sequences to minimize/compensate the jacket out of verticality. If this does not improve the level, Castoro Otto Superintendent may perform the below intermediate jacket levelling to prevent further out of level development.

Table 5-19 – Jacket Intermediate Leveling Sequence

Item Activity Remark or Reference

1 After surveyed, determine jacket leg(s) to be lifted. Estimate height required to correct the tilt and mark it on the pile.

2 Install cross beam on top of pile at the lifted leg. If required weld stoppers on the other piles in order to prevent piles to slide into the leg while levelling / raising the lowest leg.

Ref. R122

3 Set levelling jacks and riggings that connecting cross beam and levelling padeye. NOTE: Shackle body to be pre-installed and secured to the lower eye of sling

4 Recover personnel to Castoro Otto.

5 Activate the levelling jack to obtained required height. (see marking on the pile while operating the levelling tools)

6 Hold and re-survey the jacket level.

7 Confirm the jacket levelness is within tolerances.

8 Weld dog plates between jacket legs and piles. Perform NDT. Ref. R103

9 Recheck the jacket levelness.

10 Detach the levelling tools (cross beam, jack and riggings) from levelling padeye.

11 Cut stoppers (if previously installed), ground flush and 100% MPI.

12 Continue piles driving at the opposite legs




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Item Activity Remark or Reference

13 Recheck jacket levelness

14 Remove the dog plate, grind flush, 100% MPI and continue to install other pile section.

5.7. Final Leveling and Crown Plate Installation

If the jacket levels are outside the limits (ref. Section 3.3), jacket leveling will be carried out using the leveling system shown in Ref. R100.

Two units 250 t jacks will be used on each of any two jacket legs. The sequence of leveling to achieve the tolerances shall be left to the discretion of the Castoro Otto Superintendent.

Table 5-20 – Jacket Leveling and Crown Plate Installation


1. Prepare (grind and 100% MPI/UT) top of jacket legs surface for crown shims welding.

NDT Procedure

2. Conduct final jacket levelness survey. Ref. Section 3.3

3. If the level is out of tolerances, determine jacket leg to be lifted and estimate jack stroke required to correct the tilt and continue to sequence 4 to 7, otherwise continue to sequence 8.

Ref. Section 3.3

4. Carry out the Jacket reading level check and identify the leg or legs to be lifted.

5. Carry out the marking for the 1st cut off for the installation of the transition pieces.

6. Grind the pile very well starting from the top of leg in order to permit the slipping of the crown plates during the jacket lifting. The seam weld as well has to be grinded off.

7. Grind very well the internal part of the crown plates in order to permit the slipping during the jacking up of the jacket. Smooth the internal upper and lower internal corner of the crown plated.

8. Install the crown plates in order to match the dimension of the deck after the installation of the transition pieces. In the way the pile could be not in the center if the dimension of the deck requires. Put an 2 mm hammered electrode between the pile and the crown plate. By the hammered electrode between the pile and the crown plate we can have a gap 0.5 – 1.0 mm between the pile and the crown plate. So in this way is minimizing the friction between crown plate – pile during jacking up.

9. Weld the bottom and vertical parts of the crown plates installed in the 2 nos legs to be lifted.

Ref. R13, R18

10. Install the jacking system of the jacket up to foreseen target. Ref. R100

11. Weld the upper part of the crown plates meanwhile will be installed and welded the crown plates on the remaining 2 nos legs. The crown plates will be installed bearing in mind the dimension of the deck (as per sequence 9).

Ref. R13, R18

12. Release and recover the jacking system.




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5.8. LAT/MSL Survey


1. Install and set-up the tidal gauge on the suitable position on the jacket

2. Adjust tide recorder to the theoretical datum

3. Measure the LAT/MSL

5.9. Pile Final Cut-off, Transition Piece Installation and Final Cut-off

Table 5-21 – Pile Final Cut-off, Transition Piece Installation and Final Cut-off


4. Conduct pile final cut-off elevation at El. (+) 9.000 m and mark on the four pile.

Ref. R10, R11, R13, R16

5. Install cutting equipment on the pile and set to marked cutting line.

6. Rig-up Clyde Whip hook with ILT and insert ILT to top of pile.

7. Perform pile cutting and recover to Castoro Otto.

8. Repeat for sequence 2 to 4 for all piles.

9. Perform weld preparation on top of pile by bevel it as per design. Ref. R14, R19

10. Install transition piece installation guide on Jacket. Ref. R102

11. Moor jacket barge along Castoro portside.

12. Cut Transition Piece seafastening rack. Ref. R105, R107

13. Rig-up Clyde Whip hook with rigging and connect to Transition Piece padeyes.

Ref. R102

14. Put rope on Transition Piece for handling.

15. Lift up Transition Piece from seafastening to have clearance.

16. Swing Crane and stab Transition Piece to pile. Use the guide for installation.

17. Repeat for sequence 10 to 13 for remaining Transition Pieces.

5.10. Boatlanding Installation

Table 5-22 – Boatlanding Installation


1. Check suitability of weather condition. Section 3.5, 3.6; Site weather forecast.




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2. On the jacket, install scaffolding around shock cell and around Jacket leg A1/A2/B1/B2 where the boatlanding shall be secured prior to release the lifting sling.

Ref. R126, R127

3. Perform survey of jacket elevation relative to LAT in order to determine if boatlanding elevation adjustment have to be done.

Jacket elevation survey is performed upon termination of pile driving/ jacket leveling.

If boatlanding elevation adjustment has to be performed, it will be done by cutting off the extra length from bottom of boatlanding leg. Adjustment will be performed onboard cargo barge prior to lift. Note: Boatlanding seafastening has been designed to possible cutting the boatlanding legs without previously connecting the slings to the hook (Ref. R104, R106).

Cutting equipment shall be already mobilized on cargo barge to perform this activity.

4. Transfer working crews on top of jacket via gangway. Working boat to standby near the Jacket.

Can be paralleled on Sequence 3.

5. Connect boatlanding pre-rigged lifting slings to the Whip Hook of Castoro Otto Ref. R126, R127

6. Connect tugger line to boatlanding to control movement

7. Perform boatlanding seafastening cut-off. Working crews to move away at safe distance. Lift boatlanding above cargo barge to suitable height for crane and jacket clearance.

8. Swing crane in counter clockwise direction and position boatlanding above boatlanding stabbing guide.

9. Stab the boatlanding onto jacket boatlanding stabbing guide until setdown on the boatlanding support.

10. Secure top of boatlanding to jacket by means of 2 nos of chain blocks arrangement.

Ref. R126, R127

11. Once the boatlanding secured, dismantle lifting rigging and transfer to Castoro Otto.

Ref. R116

12. Fit up end of shock cell double plate on to boatlanding king post. Weld both item and perform NDT.

Ref. R20, R23, R26, R29, R32, R35

Note: The sequences are applicable for West and East boatlanding of HSD and HST Jacket.

5.11. Drilling Deck Installation

Table 5-23 – Drilling Deck Installation


1. Check suitability of weather condition Section 3.5, 3.6; Site weather forecast.

2. Connect drilling deck pre-rigged lifting slings to the Auxiliary Hook of Castoro Otto

Ref. R116, R128, R129




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3. Connect tugger line on Leg-A1 and Leg-B1 to drilling deck to control movement

Ref. R128, R129

4. Transfer working crews on top of jacket via gangway. Working boat to standby near the Jacket.

Can be paralleled on Sequence 3.

5. Lift drilling deck above cargo barge to suitable height for crane clearance.

6. Rotate drilling deck until elevation Row-1 facing to Clyde crane Ref. R128, R129

7. Swing crane in counterclockwise direction and position drilling deck above jacket.

Ref. R128, R129

8. Lower Auxiliary Hook to stab on Transition Piece. Ref. R48, R58, R128, R129

9. After set down, slack the lifting rigging and dismantle the rigging from trunnion.

Ref. R116 (sheet-3, 4)

10. Recover lifting rigging on to Castoro Otto.

11. Perform welding and NDT between drilling deck stabbing guide and transition piece.

Ref. R48, R58

5.12. Miscellaneous Activity

5.12.1. Flooding Leg and Removal Flooding Lines

Table 5-24 – Flooding Leg and Removal Flooding Lines


1. Transfer personnel to top of Jacket by accessing the ladders. Ref. R101

2. Remove lashing on reach rod handle and safety bolt on disk. Ref. R04, R07

3. Turn the handle to open the valve. Note: If the handle are difficult to be operated then flooding hose onboard Castoro Otto flooding spread will be used to flood the jacket legs thru the top of jacket.

Ref. R04, R07

4. Remove flooding reach rods. Reach rods below water level will be done by Air Diver assistance.

Ref. R134

5.12.2. Closure Plate Removal on Top of Jacket Leg

Table 5-25 – Closure Plate Removal on Top of Jacket Leg


1. Prepare cutting torch near top of leg. Ref. R06, R09

2. Install rigging on crane hook and connect to pre-installed round bar. Ref. R06, R09

3. Cut the shell plate of jacket leg closure.




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4. Lift the closure plate part and recover to Castoro Otto deck.

5. Repeat sequence 1 to 4 for remaining closure plates.

5.12.3. Removal Jacket Installation Aids

There are item of installation aids that to be removed after used. Hook-up team performs the removal of this item after Castoro Otto completed the works. The items are listed as follow:

Ballerina support “L-shape” (Ref. R99 sheet-2)

Scaffolding start-up support (Ref. R99 sheet-3)

Jacket leveling padeyes (Ref. R100 sheet-3)

Jacket access ladder (Ref. R101)

Transition piece guide support (Ref. Error! Reference source not found.)

5.12.4. Offshore Installation Jacket Appurtenances

There are item of offshore install for jacket appurtenances. Hook-up team performs the offshore installation after Castoro Otto completed the works. The items are listed as follow:

Stairway from Boatlanding to Jacket walkway at El. (+) 6.500 m for Row-1 and Row-2 (Ref. R24, R33)

Flip up Jacket walkway near Leg-B2 at El. (+) 6.500 m, weld tubular support, remove movable hinge top and remove temporary bottom support (Ref. R38, R41)

Jacket walkway at El. (+) 6.500 m handrails

5.12.5. Post Installation Survey

A detailed description of the post survey can be found in the Ref. R135.

The purpose of the survey is to ensure that the jacket and the appurtenances (i.e. anode, etc.) are not damaging during installation especially during pile driwng that the impact energy may affect to the small item attached on the jacket.

All post survey will be video-taped and presented to Company as part of as built documents.




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APPENDIX A Castoro Otto clyde Crane Load Chart

gen-s-a-jk-s-pr-0024_g02

Documents

hst jacket jacket

pipelines document

hsd platforms

g02 page

hold record sheet

g02 update section

scope of document

g01 update section