COMMONWEALTH OF AUSTRALIA
Sections 226 and 708
Offshore Petroleum and Greenhouse Gas Storage Act 2006
APPLICATION FOR VARIATION OF A PIPELINE LICENCE - PIPELINE LICENCE VIC/PL15 (COBIA TO HALIBUT) (CKFDJS)
I, MONICA ELAINE ATSALIS, the Delegate of the National Offshore Petroleum Titles Administrator, on behalf of the Commonwealth–Victoria Offshore Petroleum Joint Authority hereby give notice pursuant to sections 226 and 708 of the Offshore Petroleum and Greenhouse Gas Storage Act 2006 that an application has been received from
Esso Australia Resources Pty Ltd
(ACN 091 829 819)
Woodside Energy (Bass Strait) Pty Ltd
(ACN 004 228 004)
for the variation of Pipeline Licence VIC/PL15 in the offshore area of Victoria, as set out below.
Pursuant to subsection 226(3) of the Act, 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 on which it appears in the
Australian Government Gazette.
Made under the Offshore Petroleum and Greenhouse Gas Storage Act 2006
of the Commonwealth of Australia.
MONICA ELAINE ATSALIS
DELEGATE OF THE TITLES ADMINISTRATOR
ON BEHALF OF THE COMMONWEALTH–VICTORIA
OFFSHORE PETROLEUM JOINT AUTHORITY
APPLICATION FOR VARIATION OF
PIPELINE LICENCE VIC/PL15
The application seeks to effect the following amendments to the licence:
- Removing the flexible flowline between Cobia and Halibut platforms (i.e., DN150 (6”) flexible pipeline), removing the majority of the redundant DN300 steel pipeline between Cobia and Halibut platforms approximately 5.2km in length, the DN300 steel pipeline section remaining on the seabed at the HLA end will be plugged using an environmental plug and, the remaining licensed pipeline will be decommissioned at a later date in accordance with the regulatory approvals in place for that decommissioning activity.
- The FIRST SCHEDULE of the Licence is varied by deleting the current text and table below the heading “FIRST SCHEDULE ROUTE OF PIPELINE”
and
substituting under the heading the following:
ROUTE OF REDUNDANT DN300 STEEL PIPELINE
“The route of the pipeline is described in the table below, and displayed in the map below
(Attachment A), commencing at the cut location near the Halibut platform and terminates at the first flange upstream of the First Valve On (FVO) on the Halibut platform.”
ID | Description | Easting (mE) | Northing (mN) |
1 | Cut location near Halibut platform Redundant DN300 Steel Pipe – Section 1 Start | 615322
| 5748486
|
2 | Redundant DN300 Steel Pipe – Section 1 End | 615310 | 5748496 |
3 | Halibut platform – DN150 to DN300 riser tie-in cut location – Section 2 Start | 615309
| 5748504
|
4 | Upstream flange of FVO on Halibut platform DN300 riser – Section 2 End | 615297
| 5748505
|
Coordinate set above is based on GDA 94/MGA Zone 55, survey of pipeline centreline.
- The SECOND SCHEDULE of the Licence is varied by deleting all current text as stated in the licence renewal instrument dated 20 July 1990 and all subsequent variations (e.g., variation dated 19 October 2018 and 22 July 2019), and substituting with the following:
SPECIFICATION
Basis of Design – Redundant DN300 Steel Pipeline
The redundant DN300 steel pipeline design is based on the following parameters.
Item | Item Description | Details |
1 | Outside diameter of pipe | 323.9 mm |
2 | Wall thickness of pipe | 19.05 mm |
3 | Length | 0.016 km (approximate) |
4 | Design life | The DN300 steel pipeline is redundant and is not planned to be reused |
5 | Pipeline Material and Grade | The line pipe shall be in accordance with the requirements of the American Petroleum Institute Specifications – API Spec 5LX for Grade X52 seamless pipe and Esso Australia Limited supplemental pipe specification accompanying the pipeline licence application. |
6 | Minimum yield strength of pipe steel | 358.5 MPa |
7 | Weight Coating | DN300 pipeline is provided with 25 mm concrete weight coating. The specification for the reinforced concrete weight coating and the shop application of this material to the pipe shall be in accordance with the Esso Australia Limited Protective Coatings Specifications accompanying the 1981 pipeline licence application. |
8 | Protective Coating | The line pipe shall be protected by a coating of fusion bonded black polyethylene having a minimum coating thickness of 2.2 mm and applied in accordance with the Esso Australia Limited specification accompanying the 1981 pipeline licence application. |
9 | Internal design pressure | 13,962 kPag |
10 | Maximum Allowable Operating Pressure | Not provided |
11 | Specific Gravity | Minimum 1.3 (including contents) |
12 | Design Capacity | 12,400 kilolitres per day (12,400 m³ per day or 77,994 bbl per day) |
13 | Maximum Operating Temperature | Not provided |
14 | Maximum Design Temperature | Not provided |
15 | Minimum Design Temperature | Not provided |
16 | Characteristics of substance proposed to be conveyed | Liquid hydrocarbons (and associated produced water) |
17 | General plans and description of pump stations, tank stations or valve stations and their equipment | N/A |
18 | General plans and description of pigging facilities | N/A |
19 | Valves and Fittings | Low pressure (2.5 MPag) mechanical pipe plugs shall be installed at each end of the DN300 pipeline section. |
20 | Connection to Pipeline Tow Sled Assemblies | The redundant steel pipeline is installed within the bottom tow sled at the HLA end which was used for installation of the pipeline in 1982. This tow sled remains connected to the seabed level bracing of HLA platform. |
21 | Cathodic Protection | Transformer rectifier unit on Halibut platform provides protection to the tow sled which remains connected to the seabed level bracing of HLA platform, but does not provide cathodic protection to the redundant DN300 steel pipeline section. |
Basis of Design – DN300 Halibut Platform riser
(A) Design
The pipeline riser design is based on the following parameters –
- one 300 mm nominal diameter pipeline for the conveyance of liquid hydrocarbons;
- a flow rate of 12,400 kilolitres per day (12,400 m3per day or 77,994 bbl per day);
- an internal design pressure of 13,962 kPag;
- a DN300 riser length of approximately 0.083 km.
(B) Materials of Construction
- Steel Pipe
The riser pipework shall be in accordance with the requirements of the American Petroleum Institute Specification – API Spec 5LX and Esso Australia Limited supplemental pipe specification accompanying the pipeline licence application, Grade X52 seamless pipe and have the dimensions 323.9 mm O.D. and 19.05 mm W.T.
- Protective Coating
Protection of the riser pipework by an epoxy coating shall be in accordance with the Specification for the Protection of Pipeline Risers accompanying the pipeline licence application. Protection of the riser pipework in the splash zone area with 4.7 mm thick Monel sheeting shall be as detailed in the specifications accompanying the pipeline licence application.
(C) Cathodic Protection
- A transformer rectifier unit on Halibut platform shall provide protection to the subsea portion of the DN300 pipeline riser.
ATTACHMENT A