COMMONWEALTH OF AUSTRALIA
Section 708
Offshore Petroleum and Greenhouse Gas Storage Act 2006
APPLICATION FOR GRANT OF A PIPELINE LICENCE - SCARBOROUGH
I, GRAEME ALBERT WATERS, 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 an application has been received from
Woodside Energy Scarborough Pty Ltd
(ACN 650 177 227)
BHP Petroleum (Australia) Pty Ltd
(ACN 006 923 879)
for the grant of a pipeline licence for the conveyance of petroleum in the offshore area of Western Australia, as set out below.
A person may make a written submission to the Titles Administrator about this application within 30 days from the date of this notice.
This notice takes effect on the day in which it appears in the
Australian Government Gazette.
Made under the Offshore Petroleum and Greenhouse Gas Storage Act 2006
of the Commonwealth of Australia.
GRAEME ALBERT WATERS
TITLES ADMINISTRATOR
ON BEHALF OF THE COMMONWEALTH-WESTERN AUSTRALIAN
OFFSHORE PETROLEUM JOINT AUTHORITY
ROUTE OF THE PIPELINE
The pipeline route is described in the table hereunder and displaced in the attached map (Attachment 1), commencing at the Export Riser Base Manifold downstream connector to the State Water Boundary within a 100 m corridor (± 50 m centred on the pipeline). Coordinates are based on Geodetic Datum of Australia (GDA94).
Feature ID | Feature Name | KP | Easting (mE) | Northing (mN) |
1 | Export Riser Base Manifold | N/A | 105 648.04 | 7 793 907.57 |
2 | PLET | 433.053 | 105 628.95 | 7 793 941.16 |
3 | HTTA-1 | 365.756 | 168 690.73 | 7 787 325.82 |
4 | HTTA-2 | 280.344 | 243 346.71 | 7 814 371.94 |
5 | ILTA | 200.051 | 314 668.33 | 7 795 028.78 |
6 | 32-inch to 36-inch Transition | 200.000 | 314 690.09 | 7 794 982.33 |
7 | State Waters Boundary | 32.036 | 468 969.58 | 7 749 700.76 |
SPECIFICATIONS
Design and Construction
The offshore pipeline must be designed and constructed in accordance with Offshore Standard DNVGL-ST-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 DNVGL-ST-F101.
Basis of Design
The pipeline design is based on the following parameters:
Item | Item Description | Details and units | ||
1 | Outside diameter (OD) of pipe | Section | OD [mm] | Nominal OD [in] |
KP 32.036 to 33.1 | 925.4 | 36 | ||
KP 33.1 to 200 | 924.8 | |||
KP 200 to 204 | 814.6 | 32 | ||
KP 204 to 213 | 838.0 | |||
KP 213 to 324 | 827.6 | |||
KP 324 to 433.053 | 823.2 | |||
Buckle Arrestors | 890.0 | |||
Structures Piping Header | 838.0 | |||
Tee Branch | 406.4 | 16 | ||
Spool line pipe | 826.8 | 32 | ||
Spool bends | 837.8 | |||
2 | Wall thickness of pipe (all materials) | Section | Thickness [mm] | |
KP 32.036 to 33.1 | 30.7 | |||
KP 33.1 to 200 | 30.4 | |||
KP 200 to 204 | 27.3 | |||
KP 204 to 213 | 39.0 | |||
KP 213 to 324 | 33.8 | |||
KP 324 to 433.053 | 31.6 | |||
Buckle Arrestors | 65.0 | |||
Structures Piping Header | 39.0 | |||
Tee Branch | 30.0 | |||
Spool line pipe | 33.4 | |||
Spool bends | 38.9 | |||
3 | Length | Approximate length in Commonwealth waters: 401.017 km (KP 32.036 – KP 433.053) | ||
4 | Design life | Minimum 25 years | ||
5 | Pipeline Material | Carbon Steel | ||
6 | Pipeline Steel Grade | DNVGL-ST-F101 Grade 450 DFU | ||
7 | Protective coating | External corrosion coating is either 3.5 mm three layer polypropylene or 6.0 mm bituminous enamel with concrete weight coating (40 mm - 110 mm). Tie-in spool between the riser base manifold and pipeline end termination has ultra-high build epoxy external coating. | ||
8 | Corrosion allowances | Internal: 1.0 mm External: None (0 mm) | ||
9 | Pipeline Specification | DNVGL-ST-F101: SAWL 450 DFU | ||
10 | Minimum yield strength of pipe steel | 450 MPa | ||
11 | Maximum Allowable Operating Pressure | 23 MPa(a) at platform export discharge at 30 m above mean sea level | ||
12 | Design Capacity | 1,750 MMscf/d | ||
13 | Inlet and outlet facilities | Inlet: Riser base manifold Outlet: N/A (Pipeline transitions into state waters) | ||
14 | Fitting, valve and flange specifications | Fittings − 32-inch x 16-inch reducing tee (3 off), DNVGL-ST-F101, ASME VIII, DNVGL-RP-0034. − 36-inch x 32-inch concentric transition forging (1 off), DNVGL-ST-F101, DNVGL-RP-0034. Diverless Connectors − 32-inch horizontal connector (2 off), DNVGL-ST-F101, API 6A/ISO 10423, API 17D/ISO 13628-4. − 16-inch horizontal connector (1 off), DNVGL-ST-F101, API 6A/ISO 10423, API 17D/ISO 13628-4. Valves − 32-inch ROV operated subsea valve for PLET (1 off), DNVGL-ST-F101, ISO 14723. − 16-inch ROV operated subsea valve for Tee (2 off), DNVGL-ST-F101, ISO 14723. − Small bore bleed assemblies (2 off), DNVGL-ST-F101, ISO 14723. | ||
15 | Compressor stations | No compressor stations | ||
16 | Maximum Design Temperature | 60.0 °C | ||
17 | Minimum Design Temperature | -10 °C | ||
18 | Characteristics of substance proposed to be conveyed | Dry gas | ||
19 | General plans and descriptions of pump stations, tank stations or valve stations and their equipment | The riser base manifold collects export gas via three flexible risers. A 32-inch tie-in spool connects the riser base manifold to the pipeline end termination. The pipeline end termination is on the end of the 32-inch section at KP 433.053. Between the pipeline end termination and KP 200 the pipeline has two hot tap tee assemblies and a single in-line tee assembly. At KP 200, the pipeline transitions to 36-inch diameter. Between KP 200 and the state water boundary at KP 32.036 there are no facilities. | ||
20 | General plans and description of pigging facilities | Temporary subsea pig launcher/receiver connected to the Export Riser Base Manifold using a diverless connector and a permanent pig receiver onshore at the Pluto LNG plant site | ||
21 | Cathodic Protection | A sacrificial cathodic protection system consisting of full bracelet anodes (Al-Zn-ln Alloy) that are strapped and electrically connected to the pipeline. Anode spacing varies between 73.2 m and 292.8 m with an approximate total quantity of 3,129 anodes. Cathodic protection of structures consists of sacrificial stand off anodes (Al-Zn-ln Alloy) installed on the structure members. The tie-in spool will be protected by anodes placed on the riser base manifold structure. | ||
22 | Hydrate Management | Dehydrating and hydrocarbon dew-pointing the export gas. | ||
Attachment 1