Floatover Installation Methods

By - Uday Kulkarni and Pradeep Jain

03 Sep 2013

Float Over Installation of Topsides 1

Float-Over Installation of Topsides

Copyright & Disclaimer : Some of the material used in this presentation are Technip proprietary items and shall not be

used or reproduced for any purpose without prior written permission from Technip. Some of the material used in this

presentation is taken from public domain (ex. Internet) and is used purely for educational purpose

Content

1. What is Floatover?

2. Types of Floatover Installations

3. Vessels/Barges used

4. Floatover Stages

5. Floatover Engineering & Design

6. Systems and components used in Floatover

7. Recent Floatover Installations

8. Video

9. Floatover Installation Today & Tomorrow

2 Float Over Installation of Topsides - Content

Conventional Installation method


Heavier topsides (typ.> 4000MT) are installed by dividing it into

number of modules.

Multiple lifts using Derrick Barge are required to install the

complete Topside

What is Floatover?

Floatover Method

In a floatover, the completed topside module from the yard is transported on a barge

Float Over Installation of Topsides - Introduction 4

The vessel is positioned within or around the legs of a pre-installed substructure

The module is settled onto the jacket legs by vessel ballasting only or by combination of vessel ballasting and Jacking system

A complete single integrated deck is installed using float-over


Types of Floatover Installations

1. Active Floatover This is done using Jacks in addition to Ballasting of Barge 2. Passive Floatover This is done only by Ballasting / de-ballasting of barge

Floatover using Loose Slot method This is done using mooring and anchor lines only. Generally no contact with sub-structure is involved

Floatover using Tight Slot method This is done using fenders in addition to mooring and anchor lines

Floatover Vessels

I. Cargo Barge

II. Self propelled Vessels

III. Multiple vessels in Catamaran configuration

Float Over Installation of Topsides - Vessels 6

Floatover by Cargo Barge

Float Over Installation of Topsides By Cargo Barge 7

P52 Project by Technip for Petrobras Brazil

25000 MT Deck

Semisubmersible Hull

Cargo Barge

Floatover using Self propelled Barge

Float Over Installation of Topsides By Self Propelled Barge

8

East Area Project by Technip in Nigeria

18000 MT Deck Preinstalled Jacket

Floatover by Catamaran Barge

Float Over Installation of Topsides By Catamaran Barge 9

Kikeh Spar Project by Technip

4000 MT Topside

Spar Hull

Floatover Stages

Floatover is done broadly in following 5 stages-

Stage-1 : Stand-Off

Stage-2 : Docking

Stage-3 : Pre-Mating

Stage-4 : Mating & Vertical Load Transfer

Stage-5 : Un-docking and Exit

Float Over Installation of Topsides - Phases 10

Stage-1: Stand-Off (Conceptual)


The vessel is at a safe distance from the substructure but connected to

the mooring system, and final preparations such as preparing the vessels rapid ballast system or the hydraulic jacks are under way.

Stand-Off (Actual Operation)

Float Over Installation of Topsides -Phases 12

Stage-2 : Docking (Conceptual)


The vessel enters the substructure

Docking (Actual Operation)


Stage-3 : Pre-Mating


Ballasting the vessel to match the leg mating units (LMU) with receptors on top of

the substructure legs and removing the remaining tie downs. No weight transfer

yet occurs.

Stage-4 : Mating & Load Transfer

Float Over Installation of Topsides -Phases 16

The topsides is lowered onto the substructure by either rapid ballasting of

the vessel or by contracting the hydraulic jacks. The topsides weight is

transferred to the jacket completely

Schematic Floatover Installation using Jacks


Barge

Integrated deck

Jacket Legs

Stage-5 : Un-docking and Exit


Continue ballasting, so that a gap is created between the underside of deck

and the vessels Deck Support Frame (DSF), to ensure vessel motions will not cause contact between the two. The vessel is withdrawn from the jacket slot.

Float Over Installation of Topsides - Engineering 19

Floatover Engineering & Design

1. Jacket & Deck Configuration

2. Installation Analysis


Jacket Configuration for Floatover Installation

Deck Configuration for Floatover Installation


Non-Linear Time domain mating analysis is done for various floatover scenarios such as docking, mating and undocking condition

Mating analysis is used to predict following

Lateral forces for design of Jacket

Loads in fenders

Vertical and horizontal motions of stabbing cones

Loads in LMUs and DSUs

Maximum vertical barge motion post mating

Installation Analysis


Systems & Components used in Floatover

Float Over Installation of Topsides - Equipments 23

Barge Equipment

1. Control room

2. DSF & DSU

3. Jacking System

4. Ballast System

5. Winches, Mooring Lines and Anchoring Lines

6. Anti Surge Control system

Jacket Equipment

1. LMU (Leg Mating Unit)

2. Jacket Fendering System

Navigation & Position Aids

Environmental Parameter monitoring system

LMU Leg Mating Unit


Topside Weight = 13,000 MT

LMU Height = 3.7m

LMU Diameter = 2.0m

LMU Weight = 24 MT

LMU Installed in Jacket

LMU-Video

LMU

LMU

Recent Floatover Installations

29

More than 20 floatover Installations done by Technip between 1987 to 2013

Installation

Date

Ballasating

(B)

Jacking (J)

PROJECT CLIENT LOCATION DECK WEIGHT LEGS Barge / Vessel

1987 B Bhylene Offshore Terminal EGPC Egypt 2,200 t 8 Giant 12

1988 B Zakum Accomodation Platform ADMA. OPCO Abu Dhabi 6,500 t 8 CB4 + CB1

1991 B Khuff Production Platform ADNOC Abu Dhabi 2, 500 t 8 CB4

1995 B + J COBO - COB P1 ELF Angola 9,500 t 8 Giant 4

1996 B + J Qatargas Compression Platform QATARGAS Qatar 7,500 t 8 LB1

2000 B G.I.P. ADMA OPCO Abu Dhabi 4,200 t 6 LB1

2002 B CAKERAWALA CTOC Malaysia 18,000 t 8 S45

2003 B + J AMENAM - AMP1 ELF Nigeria 11,000 t 8 Mighty Servant 3

2003 B SOROOSH-NOW ROOZ (3 decks) SHELL Iran 9,000 t 0 LB2 / LB1

2003 B SOUTH PARS (2 decks) NIOC / Petropars Iran 6,000 t 0 Iranian Barge

2003 B NIPPON HELANG NIPPON OIL Malaysia 8,000 t 8 S45

2005 B + J EAST AREA EXXON MOBIL Nigeria 18,000 t 8 Black Marlin

2006 B + J AMENAM - AMP2 TOTAL Nigeria 9,600 t 8 Fjell

2006 B P52 (4 Column Semi) Petrobras Brazil 25,000 t 4 Purpose Built Barge

2006 B KIKEH (Spar) Murphy Malaysia 4,000 t 4 Catamaran Barges


2009 B North Belut Conoco/Philips Indonesia 13,500 t 8 S45

2010 B GPF Adma.Opco Abu Dhabi 8,000 t 8 LB1


2011 B Turkmenistan Block 1 (4 Column GBS) Petronas Capian 5,500 t 4 Purpose Built Barge

2013 B + J OFON 2 TOTAL Nigeria 16,000 t 8 Transshelf

Videos

Floatover video


Floatover Installation Today and Tomorrow

Float Over Installation of Topsides - Advantages 31

Advantages Challenges

A pre-commissioned, integrated, single piece topside can be installed

Yard facilities have to be adequate to handle heavier topside for fabrication and loadout

Can be used in shallow waters where HLVs cannot be used

Installation windows are small

Reduction in Offshore hook-up and commissioning time

Heavier Jacket is required due to barge access slot at the top

The project cost saving is of the order of 2% - 5%

The entire operation from load-out, transportation and installation has to be well controlled

The project schedules can be saved to the tune of 6% - 10%

Experience is the key to success

FUTURE Of Floatover

Potential to install very heavy topsides ( > 35,000 MT) in open sea

Can be used for fixed as well as floating structures

In India this concept has great potential due to scarcity of HLVs for lifts > 4000 MT

Questions ???


Floatover Installation Methods

Documents

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