Variation of Pipeline Licence WA-28-PL (Greater Enfield)

Feature Name

KP*

Easting (mE)

Northing (mN)

Bend Radius (m)

1

Start Point (Tie-in Flange to MPP and Start of 11” Flexible Flowline)

173 121

7 617 047

2

11” Flexible Flowline End

173 042

7 617 094

3

Centre of Laverda FLET

173 040

7 617 095

4

Start of 16” Rigid Pipeline

0.000

173 049

7 617 099

5

Tangent Point (TP) 1

2.910

175 772

7 618 124

3100

6

Intersection Point (IP) 1

176 891

7 618 545

7

TP 2

5.191

177 437

7 619 608

8

TP 3

9.346

179 337

7 623 303

3100

9

IP 2

179 931

7 624 460

10

TP 4

11.809

181 173

7 624 846

11

Centre of Cimatti In-Line Tee Assembly

16.237

185 402

7 626 161

12

TP 5

16.689

185 833

7 626 295

3100

13

IP 3

186 442

7 626 485

14

TP 6

17.947

186 927

7 626 899

15

TP 7

20.051

188 527

7 628 266

2550

16

IP 4

189 222

7 628 860

17

TP 8

21.807

190 135

7 628 878

18

TP 9

26.356

194 684

7 628 963

2550

19

IP 5

195 393

7 628 977

20

TP 10

27.740

196 007

7 628 622

21

End Point of 16” Rigid Pipeline

28.555

196 713

7 628 215

22

Centre of Ngujima Yin FLET

196 723

7 628 209

23

Start Point of 14” flexible flowline

196 721

7 628 209

24

End Point of 14” flexible

196 265

7 627 473

25

Start Point of 10” flexible riser

196 265

7 627 473

26

End Point of 10” flexible riser

195 974

7 626 968

27

End Point (Tie-in Flange to RESDV at Ngujima Yin FPSO)

195 974

7 626 968

Item Description

Details

1

Design and Construction

Offshore Standard DNV-OS-F101 – Submarine Pipeline Systems (Offshore Pipeline), which is incorporated in its entirety in Australian Standard AS2885.4 – Pipelines, Gas and Liquid Petroleum (Part 4: Submarine Pipelines)

2

Diameter of pipe

16” rigid pipeline: 406.4 mm (OD)

10” flexible production riser: 254.0 mm (ID)

11” flexible production jumper: 279.4 mm (ID)

14” flexible production flowline: 355.6 mm (ID)

3

Wall thickness of rigid pipe

16” rigid pipeline: 21.44 mm

Buckle arrestors: 23.83 mm

4

Length

16” rigid pipeline: 28.55 km

10” flexible production riser: 825 m

11” flexible production jumper: 110 m

14” flexible production flowline: 998 m

5

Design life

20 years

6

Pipeline Material and Grade

16” rigid pipeline: Carbon Steel DNV SMLS 450 SFD

Buckle arrestors: Carbon Steel DNV SMLS 450 SFD

10” flexible production riser: Stainless Steel – AISI 316L FE 02 (with an Ultimate Tensile Strength 570 MPa); Polymer Sheath – Crossflex Grade TP10

11” flexible production jumper: Stainless Steel – AISI 316L FE 02 (with an Ultimate Tensile Strength 570 MPa); Polymer Sheath – Grade TP35

14” flexible production flowline: Stainless Steel – AISI 316L FE 02 (with an Ultimate Tensile Strength 570 MPa); Polymer Sheath – Crossflex Grade TP10

7

Maximum Allowable Operating Pressure

16” rigid pipeline: 25.3 MPag

10” flexible production riser: 25.3 MPag

11” flexible production jumper: 34.5 MPag

14” flexible production flowline: 25.3 MPag

8

Design Capacity (Indicative Peak Flowrates1)

Oil Rate: 60.1 kstb/d

Produced Water Rate: 106.1 kstb/d

Liquid Rate: 113.7 kstb/d

Gas Rate: 50.2 MMscf/d 

9

Maximum Operating Temperature

16” rigid pipeline: 86◦C

10” flexible production riser: 75◦C

11” flexible production jumper: 86◦C

14” flexible production flowline: 75◦C

10

Maximum Design Temperature

16” rigid pipeline: 92◦C

10” flexible production riser: 75◦C

11” flexible production jumper: 86◦C

14” flexible production flowline: 75◦C

11

Minimum Design Temperature

16” rigid pipeline: -11◦C

10” flexible production riser: -10◦C

11” flexible production jumper: -11◦C

14” flexible production flowline: -10◦C

12

Characteristics of substance proposed to be conveyed

Commingled multiphase fluids. Representative API
gravities –

Laverda: 19.0–19.5º API

Cimatti: 31º API

Norton: 19º API

13

General plans and descriptions of pump stations, tank stations or valve stations and their equipment

The high boost MPP station located at the Laverda Field will be declared by notice published in the Commonwealth Gazette as a terminal station pursuant to section 16 of the Act, being a specified petroleum pumping station in an offshore area.

14

General plans and description of pigging facilities

Subsea to subsea pigging capability is incorporated into the design via in-line connections onto each FLET on the 16” rigid flowline onto which a subsea pig launcher and receiver will periodically be connected.

15

Cathodic Protection

A sacrificial cathodic protection system will be installed on the main 16” production flowline and associated in-line structures. Full shell bracelet Aluminium-Indium Alloy anodes will be strapped directly onto the pipeline MLPP and will be electrically connected to the linepipe. Anode design and supply will be in accordance with DNV-RP-F103. 

16

Anchoring or Other Means of Stabilisation

Lateral Stability:

Laterally stable by design DNV-RP-F109. Eight buckle sleepers installed along pipeline, with two types; Group 1 weighing 8.6Te and Group 2 weighing 14.5Te.

Axial Stability:

Two walking anchors installed at KP 16.8 and KP 27.9. Suction piles to be used at KP 16.8 consist of two structures, each weighing 129Te. Gravity bases to be used at KP 27.9 consist of two structures, each weighing 348Te.