Mob. Personnel &

Equipments

Onshore Site Preparation

- Fabrication Pipe Ramp Launcher

- Fabrication new U-Spool (welding)

- Fabrication west/east gooseneck (optional to

be fabricated onshore/offshore)

- Fab. end flange for new spool & gooseneck

(optional)

- Hydrotest on fabricated new U-Spool (option)

Launching new U-Spool

- Install floaters & wire on new U-Spool

- Install stability guide on new U-Spool

- Side-boom/Backhoe required

Offshore Fabrication

- Welding West/East Gooseneck to new

U-Spool (optional using Flange)

Transportation to Offshore

- West/East Gooseneck (optional to be

fabricated on derrick barge)

- Material for Tie-In Spool (west/east)

- A-Frame (if any offshore lifting required

for tie-in)

Offshore Site Preparation

- New Trench preparation

(backhoe dredger, swamp backhoe, etc)

- Installation Cofferdam (west/east point)

– using sheet pile / sand bags, etc (optional)

- Develops access channel for new U-Spool (TBA

during Pre-Lay Survey)

Cutting Process

- West/East Point for future tie-in on the

existing mainline/OLD U-Spool

Remove OLD U-Spool

TIE-IN (west point) – Lift & Lower

- Lifting on WEST line & new U-Spool

end (west side) – check integrity

- 1st Metrology and Fit-up

- Welding west point (tie-in spool will be

required)

- Lowering (mainline & new U-Spool)

west side

- Connecting Flange (optional tie-in)

TIE-IN (east point) – Lift & Lower

- Lifting on EAST line & new U-Spool

(east side) – check integrity

- 2nd

Metrology and Fit-up

- Welding east point (tie-in spool will be

required)

- Lowering (mainline & new U-Spool)

east side

- Connecting Flange (optional tie-in)

Installation of Marking Piles for

new U-Spool

Installation of Protection Covers

- sand bags

- concrete mattress (option)

- rock dump (option)

Demob of

personnel/equipment

(except for as built survey)

As Built Survey

Pre-Lay Survey

Assumption:

� Shutdown Operation

� Pipeline De-Gassing to be done

� Low level construction HSE

� Inshore Replacement Location

� 4.5m minimum offset / parallel

distance (depend on trench width

and soil shear strength)

Towing to offshore

TIE-IN (west point) – Cofferdam

- Lowering new U-Spool in new Trench

- 1st Metrology and Fit-up new U-Spool

end to west/east point

- Welding west point (tie-in spool will be

required) inside Cofferdam

- Connecting Flange (optional tie-in)

TIE-IN (east point) – Cofferdam

- 2nd

Metrology and Fit-up new U-Spool

end to east point only

- Welding east point (tie-in spool will be

required) inside Cofferdam

- Connecting Flange (optional tie-in)

Alternative

using WELDING

Alternative

using WELDING

Floaters installation on

OLD U-Spool

Coordinated Pipeline De-

pressurized/shutdown

Pipeline De-Gassing / N2

Purging

Using WELDING/Flange

Using WELDING/Flange

Required special equipment

for underwater BT installation

To be coordinated with all

construction preparation

Drag / Lift the OLD U-Spool

using AHT/Derrick Barge

(TBA)

In case tie-in using Flange is applied, lifting

and lowering works to be minimized.

TIE-IN (west point)

- Deploy griplock connector and stabbed

onto the west line

- 1st Metrology at west point

- Fabrication tie-in spool complete with

Flangemate adjuster on Board

- Fit-up & Bolted

TIE-IN (east point)

- Deploy griplock connector and stabbed

onto the east line

- 2nd

Metrology at east point

- Fabrication tie-in spool complete with

Flangemate adjuster on Board

- Fit-up & Bolted

Using MECHANICAL CONNECTOR

Alternative process if Tie-In

using Mechanical Protector is

applied.

COLD WORK METHOD

Pre-Commissioning