COMMONWEALTH OF AUSTRALIA

 

Sections 226 and 708

Offshore Petroleum and Greenhouse Gas Storage Act 2006

 

VARIATION OF PIPELINE LICENCE WA-21-PL

(HALYARD FLOWLINE) (02-2024)

 

I, STEVEN ROBERT TAYLOR, Delegate of the National Offshore Petroleum Titles Administrator, on behalf of the Commonwealth–Western Australia Offshore Petroleum Joint Authority hereby vary Pipeline Licence WA-21-PL, dated 20 January 2011 (the Licence), for which:

 

Santos WA Southwest Pty Limited

(ACN 050 611 688)

 

 

is the registered titleholder, 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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1.           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

1.

Pipeline Name (meaningful to industry)

Halyard Flowline

2.

Total Length of Pipeline (km)

17.4 (approximate)

3.

Start point Description

Halyard-2 Christmas Tree Connector

4.

‘Start Point of Pipeline Coordinates (GDAA94)

a)     Northing:

b)     Easting:

Zone 50

 

283 147 mN

7 720 608 mE

5.

End Point Description

East Spar Manifold

6.

‘End’ Point of Pipeline Coordinate (GDA94)

a)      Northing:

b)     Easting:

Zone 50

 

7 707 290.800 mN

290 101.200 mE

7.

Substance to be Conveyed:

Wet Gas and Condensate

8.

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

9.

Pipe Dimensions

Outside Diameter (mm)

328.9

268.1

168.3

168.3

168.3

168.3

Inside Diameter (mm)

254

203.2

139.7

146.3

131.8

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

18.3

Heavy Wall (mm)

37.5

N/A

N/A

N/A

N/A

N/A

11.

Design

N.B. Assumes nominal contents density of

114 kg/m3

 

Initial Design Capacity (TJ/d)

99.0

95

150

150

95 (90 MMscf/d)

150

Max Design Capacity (TJ/d)

250

317

164

164

150 (141 MMscf/d)

150

Design life (years)

20

20

20

20

10

20

Erosional Velocity (m/s)

50

40

40

40

40

40

12.

Pipeline Corrosion Allowance

Internal (mm)

NIL

NIL

NIL

NIL

NIL

NIL

External (mm)

NIL

NIL

NIL

NIL

NIL

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

UNS 31803, 22% Cr Duplex 2205

UNS 31803, 22% Cr Duplex 2205

UNS 31803, 22% Cr Duplex 2205

Riser

N/A

N/A

N/A

N/A

N/A

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

110

121

121

121

121

Facilities (0C)

55

55

55

55

55

55

18.

Maximum Operating Temperature

Pipeline (0C)

98

105

105

105

105

105

Facilities/stations (0C)

55

55

55

55

55

55

19.

Minimum Operating Temperature

Pipeline (0C)

-20

-20

-18

-18

-18

-18

Facilities/stations (0C)

-18

-20

-20

-20

-20

-20

20.

Design Pressure (MPag)

22.8

22.8

34.5

22.8

34.5

34.5

21.

Inlet Pressure Range (MPag)

6.0 to 21.2

6.0 to 21.5

6.0 to 21.5

6.0 to 21.5

6.0 to 21.5

6.0 to 21.5

22.

Outlet Pressure Range (MPag)

6.0 to 21.2

6.0 to 21.5

6.0 to 21.5

6.0 to 21.5

6.0 to 21.5

6.0 to 21.5

23.

Maximum Allowable Operating Pressure (MPag)

22.8 at 1100C

22.8 at 1100C

22.8 at 1100C

 

 

22.8 at 1100C

22.8 at 1100C

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

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:

 

0

38.

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

None

39.

Number of Pipeline Inlet Facilities:

0

40.

Pipeline Inlet Facilities Description:

Not Applicable

41.

Number of Pipeline Outlet Facilities:

0

42.

Pipeline Outlet Facilities Description:

Not Applicable

43.

Compressor Stations (if applicable)

a)      Number of:

b)     Location (at KP)|:

 

 

0

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):

15

57.

Design Pressure (MPag):

22.8

58.

Design Temperature (0C):

55

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

 

map showing Halyard-2 XT location layout

Map showing route of Pipeline Licence WA-21-PL

Map showing close up of SPAR 2