Attachment 1 – GWF-2 Pipeline Route
COMMONWEALTH OF AUSTRALIA
Sections 226 and 708
Offshore Petroleum and Greenhouse Gas Storage Act 2006
VARIATION OF PIPELINE LICENCE WA-27-PL
(GWF-2) (TV8S9S)
I, STEVEN ROBERT TAYLOR, the Delegate of the National Offshore Petroleum Titles Administrator, on behalf of the Commonwealth-Western Australia Offshore Petroleum Joint Authority hereby vary Pipeline Licence WA-27-PL, dated 6 October 2016 (the Licence), for which:
Woodside Energy (North West Shelf) Pty Ltd
(ACN 004 514 489)
BP Developments Australia Pty. Ltd.
(ACN 081 102 856)
Chevron Australia Pty Ltd
(ACN 086 197 757)
Woodside Energy Ltd.
(ACN 005 482 986)
Japan Australia LNG (MIMI) Pty. Ltd.
(ACN 006 303 180)
Shell Australia Pty Ltd
(ACN 009 663 576)
are the registered titleholders, as set out below.
The variation takes effect on the day on which this notice of variation is published in the Australian Government Gazette.
Made under the Offshore Petroleum and Greenhouse Gas Storage Act 2006
of the Commonwealth of Australia
STEVEN ROBERT TAYLOR
DELEGATE OF THE TITLES ADMINISTRATOR
ON BEHALF OF THE COMMONWEALTH-WESTERN AUSTRALIA
OFFSHORE PETROLEUM JOINT AUTHORITY
ROUTE OF THE PIPELINE
The pipeline route is described in the tables hereunder and displayed in the attached map (Attachment 1). The route of the main pipeline described in Table 1 commences at the Lady Nora/Pemberton (LPA) PLET to the Goodwyn Alpha (GWA) PLET, including the tie-in flowlines and spools connecting to the GWA Subsea Isolation Valves as described in Table 2. Additional GWF-4 Echo Yodel system of pipes are detailed in Table 3, commencing from the Yodel Updip Well (YOD05) Xmas Tree Hub Face to the Echo Yodel Manifold Hub Face, Table 4, commencing from the Echo Spur Well (ESA01) Xmas Tree Hub Face to the EYA Manifold Hub Face, and Table 5, commencing from the EYA Manifold Hub Face to the Keast Dockrell (KDA) Manifold Hub Face, each within a corridor of ±200m (± 100m centred on the flowlines). Coordinates are based on Geodetic Datum of Australia (GDA94).
Main Pipeline | |||||
| Feature Name | KP* | Easting (mE) | Northing (mN) | Bend Radius (m) |
1 | LPA PLET (start) | 0.0 | 359 486.48 | 7 806 936.25 |
|
2 | TP1A | 1.16 | 360 506.88 | 7 807 487.22 |
|
3 | IP1 |
| 360 607.97 | 7 807 541.81 | 1200 |
4 | TP1B | 1.389 | 360 696.87 | 7 807 614.58 |
|
5 | TP2A | 2.581 | 361 619.34 | 7 808 369.74 |
|
6 | IP2 |
| 361 684.27 | 7 808 422.89 | 1200 |
7 | TP2B | 2.748 | 361 755.97 | 7 808 422.49 |
|
8 | TP3A | 3.721 | 362 587.08 | 7 808 971.91 |
|
9 | IP3 |
| 362 652.03 | 7 809 011.41 | 1200 |
10 | TP3B | 3.873 | 362 721.46 | 7 809 042.39 |
|
11 | TP4A | 4.673 | 363 451.98 | 7 809 368.48 |
|
12 | IP4 |
| 363 538.22 | 7 809 406.97 | 1200 |
13 | TP4B | 4.861 | 363 617.38 | 7 809 458.49 |
|
14 | ZRB 1 | 5.835 | 364 433.03 | 7 809 989.28 |
|
15 | ZRB 2 | 7.171 | 365 669.04 | 7 810 496.32 |
|
16 | ZRB 3 | 9.021 | 367 215.20 | 7 811 512.14 |
|
17 | ZRB 4 | 10.828 | 368 899.52 | 7 811 168.98 |
|
18 | ZRB 5 | 12.646 | 370 448.64 | 7 813 120.32 |
|
19 | ZRB 6 | 14.659 | 371 937.46 | 7 814 475.26 |
|
20 | ZRB 7 | 16.459 | 373 458.86 | 7 815 437.22 |
|
21 | TP5A | 16.959 | 373 822.72 | 7 815 780.16 |
|
22 | IP5 |
| 374 036.69 | 7 815 981.83 | 3200 |
23 | TP5B | 17.546 | 374 210.34 | 7 816 219.12 |
|
24 | ZRB8 | 18.286 | 374 647.20 | 7 816 816.12 |
|
25 | TP6A | 18.859 | 374 886.58 | 7 817 336.68 |
|
26 | IP6 |
| 374 982.40 | 7 817 545.04 | 3800 |
27 | TP6B | 19.317 | 375 052.46 | 7 817 763.42 |
|
28 | IP ZRB 9 | 20.522 | 375 420.61 | 7 818 910.92 |
|
29 | IP ZRB 10 | 21.822 | 376 046.65 | 7 820 050.25 |
|
30 | TP7A | 22.272 | 376 334.63 | 7 820 396.03 |
|
31 | IP7 |
| 376 468.88 | 7 820 557.23 | 3000 |
32 | TP7B | 22.691 | 376 624.25 | 7 820 698.18 |
|
33 | IP ZRB 11 | 23.622 | 377 313.90 | 7 821 323.78 |
|
34 | IP ZRB 12 | 25.722 | 379 128.65 | 7 822 380.50 |
|
35 | IP ZRB 13 | 28.122 | 381 401.79 | 7 823 150.46 |
|
36 | IP ZRB 14 | 30.522 | 383 506.70 | 7 824 303.44 |
|
37 | IP ZRB 15 | 32.922 | 385 379.42 | 7 825 804.41 |
|
38 | TP8A | 33.55 | 385 929.99 | 7 826 105.99 |
|
39 | IP8 |
| 386 298.69 | 7 826 307.95 | 5000 |
40 | TP8B | 34.388 | 386 695.94 | 7 826 445.52 |
|
41 | GWA-PLET (End) | 35.372 | 387 625.69 | 7 826 767.47 |
|
Table 1. Route of the main pipeline (*KP=Kilometre Point).
Tie-in Flowlines and Spools | ||
Feature Name | Easting (mE) | Northing (mN) |
LPA Manifold* | 359 467.98 | 7 806 837.94 |
SRA Manifold* | 366 349.04 | 7 810 815.00 |
EYA Manifold* | 369 933.46 | 7 815 196.82 |
KDA Manifold* | 372 751.34 | 7 814 863.10 |
DOA Tie-In Skid* | 375 825.52 | 7 819 425.25 |
GWF-2 Z-Spool (GWA PLET 16” Inboard Hub Face) | 387 625.69 | 7 826 767.47 |
GWF-2 Z-Spool (MCS 16” Inboard Hub Face) | 387 663.64 | 7 826 737.88 |
GWF-2 U-Spool (MCS 16” Inboard Hub Face) | 387 664.95 | 7 826 734.10 |
GWF-2 U-Spool (GWF-1/GWF-2 SSIV 16” Inboard Hub Face) | 387 675.21 | 7 826 701.18 |
Table 2. Coordinates of the 10” tie-in flowline points and spools (*Italics = not GWF-2 system of pipes).
YOD05 Xmas Tree Hub Face to EYA Manifold Hub Face Flowline | |||
Feature Name | Easting (mE) | Northing (mN) | Bend radius (m) |
YOD05 Xmas Tree Hub Face | 366 843 | 7 815 548 |
|
TP1A | 367 431 | 7 815 279 |
|
IP1 | 367 530 | 7 815 234 | 500 |
TP1B | 367 639 | 7 815 234 |
|
TP2A | 369 889 | 7 815 234 |
|
IP2 | 369 904 | 7 815 234 | 30 |
TP2B | 369 913 | 7 815 223 |
|
EYA Manifold Hub Face | 369 931 | 7 815 199 |
|
Table 3. Coordinates from the YOD05 Well Xmas tree to the EYA Manifold Flowline.
ESA01 Xmas Tree Hub Face to EYA Manifold Hub Face Flowline | |||
Feature Name | Easting (mE) | Northing (mN) | Bend radius (m) |
ESA01 Xmas Tree Hub Face | 369 840 | 7 815 083 |
|
TP3A | 369 836 | 7 815 103 |
|
IP3 | 369 834 | 7 815 117 | 25 |
TP3B | 369 845 | 7 815 127 |
|
EYA Manifold Hub Face | 369 932 | 7 815 195 |
|
Table 4. Coordinates from the ESA01 Well Xmas Tree to the EYA Manifold Flowline.
EYA Manifold Hub Face to KDA Manifold Hub Face Flowline | |||
Feature Name | Easting (mE) | Northing (mN) | Bend radius (m) |
EYA Manifold Hub Face | 369 935 | 7 815 194 |
|
TP4A | 369 984 | 7 815 133 |
|
IP4 | 370 011 | 7 815 100 | 150 |
TP4B | 370 050 | 7 815 086 |
|
TP5A | 371 156 | 7 814 681 |
|
IP5 | 371 199 | 7 814 665 | 200 |
TP5B | 371 244 | 7 814 669 |
|
TP6A | 372 265 | 7 814 767 |
|
IP6 | 372 274 | 7 814 768 | 30 |
TP6B | 372 282 | 7 814 763 |
|
TP7A | 372 378 | 7 814 712 |
|
IP7 | 372 457 | 7 814 670 | 150 |
TP7B | 372 532 | 7 814 719 |
|
KDA Manifold Hub Face | 372 747 | 7 814 862 |
|
Table 5. Coordinates from the EYA Manifold to the KDA Manifold Flowline.
SPECIFICATIONS
Design and Construction
The offshore pipeline must be designed and constructed in accordance with 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). Specifically, the design and construction phase of the pipeline must comply with DNV-OS-F101. The flexible flowlines and manifold are designed and constructed in accordance with the current version of the key design standards in Table 6.
Standard | Title |
API 17B | Recommended Practice for Flexible Pipe |
API 17J | Specification for Unbonded Flexible Pipe |
API 17L1 | Specification for Unbonded Flexible Pipe Ancillary Equipment |
API 17L2 | Recommended Practice for Flexible Pipe Ancillary Equipment |
API 17P | Recommended Practice for Subsea Structures and Manifolds |
Table 6. Key design standards for the Echo Yodel Flexible Flowlines and EYA Manifold.
Basis of Design
The pipeline design is based on the following parameters:
Item | 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 | Outside diameter of pipe | 16” Production Flowline:
| KP9.2 - 35.4: 396.8 mm KP0.0 - 9.2: 406.4 mm | |
3 | Wall thickness of pipe (carbon steel) | 16” Production Flowline:
| KP9.2 - 35.4: 20.6 mm KP0.0 - 9.2: 25.4 mm | |
4 | Minimum Clad Thickness | 3.0 mm | ||
5 | Length | 35.4 km (approximate) | ||
6 | Design life | 25 years (approximate) | ||
7 | Pipeline Material | 16” Production Flowline:
Manifold Tie-in Spools:
10” PLET/ILTA Piping:
Platform Tie-in Spools:
16” PLET/ILTA Piping:
Flexible flowlines: | Metallurgically Clad CRA Linepipe Metallurgically Clad CRA Linepipe Metallurgically Clad CRA Linepipe Metallurgically Clad CRA Linepipe Metallurgically Clad CRA Linepipe Unbonded flexible pipes with inner carcass made of duplex (2205) stainless steel | |
8 | Pipeline Grade | DNV-OS-F101 16” Production Flowline: Manifold Tie-in Spools: 10” PLET/ILTA Piping: Platform Tie-in Spools: 16” PLET/ILTA Piping: |
Grade 415 (X60) Grade 450 (X65) Grade 450 (X65) Grade 450 (X65) Grade 450 (X65) | |
9 | Maximum Allowable Operating Pressure | 30.0 MPa(a) | ||
10 | Design Capacity | Upstream of and including ILTAs: Downstream of ILTAs: Upstream of GWA PLET: Downstream of GWA PLET: | 14.8 KT/d 21.6 KT/d 21.6 KT/d 21.6 KT/d | |
11 | Maximum Operating Temperature | Upstream of and including ILTAs: Downstream of ILTAs: Upstream of GWA PLET: Downstream of GWA PLET: | 113°C 113°C 113°C 84°C | |
12 | Maximum Design Temperature | Upstream of and including ILTAs: Downstream of ILTAs: Upstream of GWA PLET: Downstream of GWA PLET: | 119°C 119°C 119°C 110°C | |
13 | Minimum Design Temperature | Upstream of and including ILTAs: Downstream of ILTAs: Upstream of GWA PLET: Downstream of GWA PLET: | -22°C -17°C -17°C -10°C | |
14 | Characteristics of substance proposed to be conveyed | Commingled petroleum (wet gas, ranging 80-87% methane) from LPA, SRA, KDA and DOA. | ||
15 | Hydrate Management Strategy | Insulation and MEG Injection | ||
16 | Cathodic Protection | Sacrificial cathodic protection system installed on GWF-2 flowline, spools and structures. Full-shell, tapered bracelet type AL-Zn-In alloy anodes installed directly over flowline thermal insulation. Anode inserts directly welded onto doubler plates welded to flowline. Cathodic protection for spools provided by anodes on structures; cathodic protection for subsea structures provided by stand-off, Al-Zn-In anodes installed directly on structural members. | ||
Table 7. Basis of Design Specifications for GWF-2 and GWF-4 system of pipes.
Item | Item Description | Details |
1 | Internal diameter | 10 inches |
2 | Design capacity | 180 MMscf/d |
3 | Maximum allowable operating pressure | 34.5 MPa(a) |
4 | Maximum design temperature | 110°C |
5 | Maximum operating temperature | 104°C |
6 | Minimum design temperature | -29°C |
7 | Design life | 15 Years |
Table 8. Key design parameters for YOD05 to EYA Flexible Flowline.
Item | Item Description | Details |
1 | Internal diameter | 8 inches |
2 | Design capacity | 180 MMscf/d |
3 | Maximum allowable operating pressure | 34.5 MPa(a) |
4 | Maximum design temperature | 110°C |
5 | Maximum operating temperature | 104°C |
6 | Minimum design temperature | -29°C |
7 | Design life | 15 Years |
Table 9. Key design parameters for ESA01 to EYA Flexible Flowline.
Item | Item Description | Details |
1 | Internal diameter | 10 inches |
2 | Design capacity | 300 MMscf/d |
3 | Maximum allowable operating pressure | 34.5 MPa(a) |
4 | Maximum design temperature | 110°C |
5 | Maximum operating temperature | 104°C |
6 | Minimum design temperature | -29°C |
7 | Design life | 15 Years |
Table 10. Key design parameters for EYA to KDA Flexible Flowline.
Item | Item Description | Details |
1 | Internal diameter header | 10 inches |
2 | Internal diameter branches | 7 inches |
3 | Number of headers / branches | 1 / 2 |
4 | Maximum allowable operating pressure | 34.5 MPa(a) |
5 | Maximum design temperature | 110°C |
6 | Maximum operating temperature | 104°C |
7 | Minimum design temperature | -18°C |
8 | Material Class | HH Trim |
9 | Design life | 15 Years |
Table 11. Key design parameters for EYA Manifold.
The GWF-2 Route Map on page 6 is deleted and replaced with the map at Attachment 1.
Attachment 1 – GWF-2 Pipeline Route