COMMONWEALTH OF AUSTRALIA
Sections 16 and 708
OFFSHORE PETROLEUM AND GREENHOUSE GAS STORAGE ACT 2006
GRANT OF PIPELINE LICENCE WA-28-PL AND DECLARATION OF TERMINAL STATION
I, TERRENCE JOHN MCKINLEY, Delegate of the National Offshore Petroleum Titles Administrator, on behalf of the Commonwealth–Western Australia Offshore Petroleum Joint Authority, hereby give notice pursuant to section 708 of the Offshore Petroleum and Greenhouse Gas Storage Act 2006 that Pipeline Licence WA-28-PL for petroleum, in relation to the Greater Enfield system of pipes, has been granted to Woodside Energy Ltd. (ABN 63 005 482 986) and Mitsui E&P Australia Pty Ltd (ACN 108 437 529), from and including 16 May 2017.
I further give notice that effective the date of this notice the high boost subsea multiphase pump (MPP) station located at the Laverda Canyon Field is declared as a terminal station pursuant to section 16 of the Offshore Petroleum and Greenhouse Gas Storage Act 2006, being a specified petroleum pumping station in an offshore area.
ROUTE OF THE PIPELINE
The route of the system of pipes is described in the table hereunder and displayed in the attached map (Attachment 1), commencing at the tie-in flange to the Laverda high boost multiphase pump (MPP) station and ending at the tie-in flange to the Remote Emergency Shutdown Valve (RESDV) at the Ngujima Yin FPSO. Coordinates are based on Geodetic Datum of Australia (GDA94).
Greater Enfield System of Pipes | |||||
| Feature Name | KP* | Easting (mE) | Northing (mN) | Bend Radius (m) |
1 | Start Point (Tie-in Flange to MPP and Start of 11” Flexible Flowline) |
| 173 120 | 7 617 047 |
|
2 | 11” Flexible Flowline End |
| 173 042 | 7 617 094 |
|
3 | Centre of Laverda FLET |
| 173 039 | 7 617 094 |
|
4 | Start of 16” Rigid Pipeline | 0.000 | 173 111 | 7 617 098 |
|
5 | Tangent Point (TP) 1 | 2.911 | 175 758 | 7 618 118 | 3100 |
6 | Intersection Point (IP) 1 |
| 176 973 | 7 618576 | |
7 | TP 2 | 5.344 | 177 503 | 7 619 745 | |
8 | TP 3 | 9.437 | 179 192 | 7 623 473 | 3100 |
9 | IP 2 |
| 179 971 | 7 625 191 | |
10 | TP 4 | 12.825 | 181 854 | 7 625 289 | |
11 | TP 5 | 13.334 | 182 363 | 7 625 316 | 3100 |
12 | IP 3 |
| 182 751 | 7 625 336 | |
13 | TP 6 | 14.107 | 183 121 | 7 625 452 | |
14 | Centre of Cimatti In-Line Tee Assembly | 16.496 | 185 401 | 7 626 161 |
|
15 | TP 7 | 16.946 | 185 833 | 7 626 295 | 3100 |
16 | IP 4 |
| 186 442 | 7 626 484 | |
17 | TP 8 | 18.204 | 190 135 | 7 628 877 | |
18 | TP 9 | 20.309 | 188 526 | 7 628 266 | 2550 |
19 | IP 5 |
| 189 221 | 7 628 860 | |
20 | TP 10 | 22.064 | 190 135 | 7 628 877 | |
21 | TP 11 | 26.614 | 194 684 | 7 628 963 | |
22 | IP 6 |
| 195 399 | 7 628 976 | |
23 | TP 12 | 28.007 | 196 016 | 7 628 617 | |
24 | End Point of 16” Rigid Pipeline | 28.800 | 196 707 | 7 628 214 |
|
25 | Centre of Ngujima Yin FLET |
| 196 715 | 7 628 209 |
|
26 | Start Point of 10” flexible riser |
| 196 712 | 7 628 209 |
|
27 | End Point of 10” flexible riser |
| 195 974 | 7 626 968 |
|
28 | End Point (Tie-in Flange to RESDV at Ngujima Yin FPSO) |
| 195 973 | 7 626 971 |
|
Route of the Greater Enfield system of pipes (*KP=Kilometre Point).
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.
Basis of Design
The pipeline design is based on the following parameters:
| 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) |
3 | Wall thickness of rigid pipe | 16” rigid pipeline: 21.44 mm Buckle arrestors: 23.83 mm |
4 | Length | 16” rigid pipeline: 28.8 km 10” flexible production riser: 1823 m 11” flexible production jumper: 110 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 |
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 |
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 |
10 | Maximum Design Temperature | 16” rigid pipeline: 92◦C 10” flexible production riser: 75◦C 11” flexible production jumper: 86◦C |
11 | Minimum Design Temperature | 16” rigid pipeline: -11◦C 10” flexible production riser: -10◦C 11” flexible production jumper: -11◦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. |
ATTACHMENT 1