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Application for Variation of a Pipeline Licence (Pipeline Licence WA-21-PL)

Application for Variation of a Pipeline Licence (Pipeline Licence WA-21-PL)

Administered by Department of Industry, Science and Resources

Legislation au C2023G01100 In force Gazette

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COMMONWEALTH OF AUSTRALIA

Sections 226 and 708

Offshore Petroleum and Greenhouse Gas Storage Act 2006

APPLICATION FOR VARIATION OF A PIPELINE LICENCE

(PIPELINE LICENCE WA-21-PL)

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 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

Santos WA Southwest Pty Limited

(ACN 050 611 688)

for the variation of Pipeline Licence WA-21-PL in the offshore area of Western Australia, 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.

STEVEN ROBERT TAYLOR

DELEGATE OF THE TITLES ADMINISTRATOR

ON BEHALF OF THE COMMONWEALTH–WESTERN AUSTRALIA

OFFSHORE PETROLEUM JOINT AUTHORITY

APPLICATION FOR VARIATION OF

PIPELINE LICENCE WA-21-PL

The application seeks to effect the following amendments to the licence:

Annexure B is varied by deleting all the current text and replacing with the following:

The route of the Greater East Spar system of pipes is described in the table hereunder, commencing at the Halyard-2 Christmas Tree (XT) Connector and terminating at the western tie-in flange on the East Spar Manifold. Coordinates are based on Geodetic Datum of Australia (GDA94).

Main Halyard Flowline System Co-Ordinates
	Feature Name	KP	Easting (m)	Northing (m)
1.	Halyard-2 XT Connector	0.00	283 147	7 720 608
2.	Greater East Spar PLEM	0.02	283 157	7 720 584
3.	Greater East Spar Subsea Cooling Skid	0.05	283 171	7 720 557
4.	Halyard 10” Flowline KP0.0	0.06	283 175	7 720 553
5.	Halyard 10” Flowline KP1.0	1.00	283 612	7 719 875
6.	Halyard 10” Flowline KP2.0	2.00	284 204	7 719 160
7.	Halyard 10” Flowline KP3.0	3.00	284 361	7 718 445
8.	Halyard 10” Flowline KP4.0	4.00	284 811	7 717 553
9.	Halyard 10” Flowline KP5.0	5.00	285 263	7 716 662
10.	Halyard 10” Flowline KP6.0	6.00	285 715	7 715 771
11.	Halyard 10” Flowline KP7.0	7.00	286 086	7 714 869
12.	Halyard 10” Flowline KP8.0	8.00	286 535	7 713 976
13.	Halyard 10” Flowline KP9.0	9.00	286 985	7 713 084
14.	Halyard 10” Flowline KP10.0	10.00	287 434	7 712 191
15.	Halyard 10” Flowline KP11.0	11.00	287 881	7 711 297
16.	Halyard 10” Flowline KP12.0	12.00	288 330	7 710 405
17.	Halyard 10” Flowline KP13.0	13.00	288 778	7 709 512
18.	Halyard 10” Flowline KP14.0	14.00	289 226	7 708 619
19.	Halyard 10” Flowline KP15.0	15.00	289 674	7 707 729
20.	Halyard 10” Flowline KP15.6	15.59	290 088	7 707 280
21.	East Spar PLEM	15.60	290 091	7 707 279
22.	East Spar Manifold western flange tie-in spool (end)	15.61	290 101	7 707 291

Route of Spar-2 Tie-in 8” Flowline Co-Ordinates
	Feature Name	KP	Easting (m)	Northing (m)
1.	Spar-2 Christmas Tree (start)	0.00	281 791	7 719 735
2.	Spar-2 8” Flowline	1.00	282 605	7 720 276
3.	Spar-2 8” Flowline (end) (GES PLEM)	1.68	283 154	7 720 585

2. Annexure C “Basis of Design” is varied by updating the items in bold and italics:

General Details

Pipeline Name (meaningful to industry)

Halyard Flowline

Total Length of Pipeline (km)

17.290

Start point Description

Halyard-2 Christmas Tree Connector

‘Start Point of Pipeline Coordinates (GDAA94)

a) Northing:

b) Easting:

Zone 50

283 147 mN

7 720 608 mE

End Point Description

East Spar Manifold

‘End’ Point of Pipeline Coordinate (GDA94)

a) Northing:

b) Easting:

Zone 50

7 707 290.800 mN

290 101.200 mE

Substance to be Conveyed:

Wet Gas and Condensate

Characteristics of Substance to be Conveyed;

a) Gas Composition:

Methane (C1)	87.24 (mol %)
Ethane (C2)	4.98 (mol %)
Propane (C3)	1.92 (mol %)
Butane (C4)	0.87 (mol %)
Pentane (C5)	0.42 (mol %)
Hexane (C6)	0.26 (mol %)
Heptane (C7)	0.15 (mol %)
Water (H20)	0.00 (mol %)
Carbon Dioxide (CO2)	3.23 (mol %)
Nitrogen (N2)	0.93 (mol %)
Helium (He)	0.00 (mol %)
Mercury (Hg)	0.00 (mol %)
Hydrogen Sulphide (H2S)	0.00 (mol %)

Design Details

Halyard -1 10” Flowline

Spar-2 8” Flowline

GES PLEM

GES SCS

Halyard-2 6” Tie-In Spool

GES PLEM – SCS 6” Tie-In Spool

Pipe Dimensions

Outside Diameter (mm)

328.9

268.1

168.3

Inside Diameter (mm)

254

203.2

139.7

146.3

131.8

Length of Pipeline (km)

15.554

1.679

0.05

0.94

0.019 to 0.026

0.022 (±0.003)

10.

Nominal Wall Thickness

Standard Wall (mm)

37.3

32.5

14.3

11.0

18.3

Heavy Wall (mm)

37.5

N/A

11.

Design

N.B. Assumes nominal contents density of

114 kg/m3

Initial Design Capacity (TJ/d)

99.0

150

95 (90 MMscf/d)

150

Max Design Capacity (TJ/d)

250

317

164

150 (141 MMscf/d)

150

Design life (years)

Erosional Velocity (m/s)

12.

Pipeline Corrosion Allowance

Internal (mm)

NIL

External (mm)

NIL

13.

Pipe Steel Specification and grade

Pipeline

API 17J Duplex 2101 (7.2 mm thick)

API Spec 17J Duplex 2101

UNS 31803, 22% Cr Duplex 2205

Riser

N/A

14.

Joint type (welded, Mechanical etc)

Mechanical Graylock connectors

15.

Pipe Free Span (m) at Location (KP)

Not Applicable

16.

Yield Strength of Pipe Steel

a) Burst Pressure:

b) Collapse Pressure

c) Failure Pressure

44 MPag

2.8 MPag

2.9 2848 kN

Temperature and Pressure Details

Halyard -1 10” Flowline

Spar-2 8” Flowline

GES PLEM

GES SCS

Halyard-2 6” Tie-In Spool

GES PLEM – SCS 6” Tie-In Spool

17.

Design Temperature

Pipeline (0C)

110

121

Facilities (0C)

18.

Maximum Operating Temperature

Pipeline (0C)

105

Facilities/stations (0C)

19.

Minimum Operating Temperature

Pipeline (0C)

-20

-18

Facilities/stations (0C)

-18

-20

20.

Design Pressure (MPag)

22.8

34.5

22.8

34.5

21.

Inlet Pressure Range (MPag)

6.0 to 21.2

6.0 to 21.5

22.

Outlet Pressure Range (MPag)

6.0 to 21.2

6.0 to 21.5

23.

Maximum Allowable Operating Pressure (MPag)

22.8 at 1100C

24.

Field Test Pressure

a) Proposed Field Test Pressure:

b) Minimum Field Test Pressure [ ] x MAOP

= [ ] MPag

22.80

Minimum Field Test Pressure [1.10] x MAOP

= 25.08 MPag

Pipeline Coatings

25.

Protective External Coating Specification and Thickness (mm):

API 17 J; outer sheath MDPE 8 mm

26.

Weight Coating Design Specification and Thickness (mm):

None

27.

Field Joint Coating:

Not Applicable

28.

Pipe-to-Pipe Joint Coating:

NORSOK M-501 System 7

Control Monitoring

29.

Pressure and Flow Controls Description:

Located on Halyard Well and John Brookes Platform

30.

Safety and Emergency Shutdown Description:

Located on Halyard Well and John Brookes Platform

31.

Telemetry Control:

SCADA or equivalent located on John Brookes Platform

32.

Pigging Facilities

a) General Facilities:

b) Description of Pigging Facilities:

Not Applicable

33.

Provisions for cathodic protection of the pipeline:

Sacrificial Al-Zn-In Anodes at flowline end fittings

34.

Cathodic Potential Monitoring:

Not Applicable

35.

Cathodic Protection Test Posts:

Not Applicable

Valves & Inline Facilities

36.

Fittings, Valves and Flanges specifications

a) Fittings:

b) Valves:

c) Flanges:

d) Halyard-2 Spool:

ASME B16.5; ASME VIII; DNV OS F101

API 6D; DNV OS F101

ASME B16.5; ASME VII; DNV OS F101

ASME B31.8

37.

Mainline Valves

a) Number of:

b) Type:

c) Location (at KP):

d) Details of Mainline Valves:

38.

Location of future Off-take Tees (at KP):

None

39.

Number of Pipeline Inlet Facilities:

40.

Pipeline Inlet Facilities Description:

Not Applicable

41.

Number of Pipeline Outlet Facilities:

42.

Pipeline Outlet Facilities Description:

Not Applicable

43.

Compressor Stations (if applicable)

a) Number of:

b) Location (at KP)|:

44.

Other Inline Facilities:

None

Crossings & Pipeline Stabilisation

45.

Location of the crossing:

Not Applicable

46.

Pipeline Crossing Type:

Not Applicable

47.

Crossings Design Standard:

Not Applicable

48.

Minimum Earth Cover or Other Means of Stabilisation:

None

49.

Anchoring Details:

Not Applicable

Pipeline Management

50.

Environmental Design Criteria Description:

100 year cyclonic criteria

51.

Marine Growth Allowance (mm):

None

52.

Risk Management Description:

DNV OS F101

PLEM-ES Manifold Tie-in Spool (Rigid Pipe)

53.

Pipe Outside Diameter (mm)

355.6 mm

54.

Pipe Wall Thickness (mm)

19.05 mm

55.

Pipe Steel Grade and Specification:

Duplex Stainless Steel AA 928 UNS31803

56.

Pipe Length (m):

57.

Design Pressure (MPag):

22.8

58.

Design Temperature (0C):

59.

Design Code:

ASME B 31.8

3. The WA-21-PL Pipeline Route Map at Annexure A is deleted and replaced with the maps at Attachment 1.

Attachment 1

Overview

The Offshore Petroleum and Greenhouse Gas Storage Act 2006, enacted by the Parliament of Australia, addresses the regulation and management of offshore petroleum activities, including the licensing of pipelines used in these operations. This Act aims to ensure the environmentally sustainable development of Australia's offshore petroleum resources while also addressing greenhouse gas storage. The notice in the Gazette, issued by Steven Robert Taylor, the Delegate of the National Offshore Petroleum Titles Administrator on behalf of the Commonwealth–Western Australia Offshore Petroleum Joint Authority, pertains to an application for the variation of Pipeline Licence WA-21-PL by Santos WA Southwest Pty Limited. The application seeks to amend the pipeline's route and other technical specifications, allowing the public to submit written submissions within 30 days from the notice's publication date. This process is integral to maintaining regulatory oversight and public participation in offshore petroleum activities.

Scope and Application

The Offshore Petroleum and Greenhouse Gas Storage Act 2006 applies to entities involved in the offshore petroleum and greenhouse gas storage activities within the Commonwealth and state waters of Australia. Specifically, this legislation governs the granting, variation, and revocation of pipeline licences such as the one held by Santos WA Southwest Pty Limited for the pipeline licence WA-21-PL. This Act extends to offshore areas and applies to the conduct and transactions related to the construction, operation, and maintenance of pipelines for the transport of petroleum or greenhouse gas. The application for the variation of Pipeline Licence WA-21-PL is targeted at modifying the pipeline route and operational details, including the description of the pipeline's path and the basis of design. The application is made within the jurisdiction of the Commonwealth-Western Australia Offshore Petroleum Joint Authority. The notice of the application is published to allow public submissions within 30 days, as mandated by the Act. The changes proposed do not explicitly state any exclusions or exemptions but are subject to regulatory approval under the Act. The application and subsequent decisions can be further regulated or detailed through subordinate instruments or guidelines issued under the authority of the Act.

Key Provisions

Sections 226 and 708 of the Offshore Petroleum and Greenhouse Gas Storage Act 2006 govern the application for the variation of a pipeline licence, specifically addressing the changes proposed to the existing pipeline licence, WA-21-PL. This application, submitted by Santos WA Southwest Pty Limited, seeks to amend the pipeline route and design details. The proposed changes include specific coordinates for the pipeline's route, detailed descriptions of pipeline components, and updated design specifications. The changes also involve modifications to the pipeline's basis of design, encompassing general details, design details, and operational parameters such as temperature and pressure ratings. The Act imposes several obligations on the applicant and relevant authorities. The applicant, Santos WA Southwest Pty Limited, must provide detailed documentation supporting the proposed changes, including updated pipeline maps and design specifications. The Delegate of the National Offshore Petroleum Titles Administrator is required to review the application and make a decision based on the provided information. Additionally, the Act mandates public notification of the application, allowing interested parties to submit written submissions within 30 days of the notice's publication in the Australian Government Gazette. Failure to comply with the requirements of the Act can result in various consequences. Under section 708, non-compliance with the provisions of the Act may lead to enforcement actions. Potential penalties for breaches could include fines, suspension or revocation of the pipeline licence, and other civil or criminal sanctions as deemed appropriate by the relevant authorities. The maximum penalties for such offences are not explicitly stated in the notice but are generally governed by the broader provisions of the Offshore Petroleum and Greenhouse Gas Storage Act 2006, which can include substantial fines and imprisonment for serious offences.

Area of Law: Environmental Law; Energy Law
Instrument: Gazette Notice
Concepts: Definitions & Interpretation; Reporting & Disclosure Obligations; Enforcement Powers

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.

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