Application for Variation of a Pipeline Licence - Pipeline Licence WA-9-PL (WKWKN5)

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-9-PL (WKWKN5)

I, STEVEN ROBERT TAYLOR, 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

Woodside Energy (North West Shelf) Pty Ltd

(ACN 004 514 489)

Chevron Australia Pty Ltd

(ACN 086 197 757)

Woodside Energy Ltd.

(ACN 005 482 986)

Shell Australia Pty Ltd

(ACN 009 663 576)

BP Developments Australia Pty. Ltd.

(ACN 081 102 856)

Japan Australia LNG (MIMI) Pty. Ltd.

(ACN 006 303 180)

for the variation of Pipeline Licence WA-9-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

TITLES ADMINISTRATOR

ON BEHALF OF THE COMMONWEALTH–WESTERN AUSTRALIA

OFFSHORE PETROLEUM JOINT AUTHORITY

APPLICATION FOR VARIATION OF

PIPELINE LICENCE WA-9-PL

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

1.       The ‘ROUTE OF THE PIPELINE’ is varied by deleting the text and replacing it with the following:

ROUTE OF THE PIPELINE

The route of the pipeline shall be from the plug at GWA SSIV, at or about 387813.74mE, 7 826 755.54mN up to and including the barred tee of the production header on GWA platform as shown in the drawing attached to this licence as annexure ‘A’.  

Notes:

1: Australian Geodetic Datum 1984, UTM projection, zone 50, central meridian 117° East

2: Geodetic Reference System (GRS 80), Geocentric Datum Australia 1994, UTM projection, zone 50, central degrees 117°East

1.       The ‘CONDITIONS 1. Design Specifications’ is varied by deleting the text and replacing it with the following:

CONDITIONS

1.       Design Specifications

Except as otherwise specified in this Schedule the pipeline shall be designed, constructed, tested and operated in accordance with DNV OS F101, and shall generally comply with the exceptions listed below. (See also WEL document “Pipeline Licence Application – Review of MPR exceptions to DNV OS F101, Rev 0 [WEL Doc No. A1892-AG-133873]).

1.                  Hoop stress limited to 72% SMYS;
2.                Combined stress limited to 90% SMYS for long term exposure;
3.             Combined stress limited to 90% SMYS with a 0.5% strain limit for occasional exposure;
4.              Pressure strength test limited to a pressure equivalent to 90% SMYS (1.25 x 72% SMYS) at the highest elevation in any test section.

DNV OS F101 is supplemented with additional codes and standards, including:

The pipeline design is based on the following parameters:

Notes:

1: Entire 22.9km of subsea pipeline is removed. Remaining infrastructure is from GWA SSIV to RESDV which is less than 500m.

1.       The ‘CONDITIONS 2. Pipeline System Description’ is varied by deleting the text and replacing it with the following:

1.       Pipeline System Description

The pipeline system includes the following:

• GWA SSIV assembly
• GWA SSIV assembly / GWA riser tie-in spool
• GWA riser
• GWA topsides riser piping.

The pipeline system commences at the GWA SSIV assembly. The end of the SSIV assembly is plugged to preserve the remaining section of the pipeline system. The GWA SSIV assembly is situated adjacent to the base of GWA. It comprises the SSIV ball valve, a duplex piping spool, and protection / installation frame. The GWA SSIV assembly / GWA riser tie-in spool connects the GWA SSIV assembly to the GWA riser. The GWA riser is a component of the 38” EY caisson. The caisson also includes two 12” j-tubes, one for the EY electro-hydraulic control umbilical and one for spare for future use. The caisson is located on the north face of GWA. It is external to the jacket to an approximate elevation of -5m (wrt LAT), at this level a swan neck routes the caisson inside the jacket so that it is protected from ship impact. A vertical brace fitted adjacent to the caisson adds further ship impact protection.

1.   Pipeline Valves

There are four pipeline (ie 12” NS) valves in the pipeline system. These are:

1.                  SSIV at the base of the GWA riser. This is a ball valve and is fitted with a hydraulic actuator. The actuator is powered by direct hydraulics from GWA. Hydraulic jumpers are split out of the main Yodel umbilical adjacent to the SSIV assembly.
2.                RESDV at the top of the GWA riser. This is a ball valve and is fitted with a pneumatic actuator. The actuator is powered by the GWA instrument air supply on GWA topsides.
3.             Two ball valves in a double block and bleed assembly at the pipeline end on GWA for the temporary pig launcher / receiver. These valves are fitted with a manual gearbox.

1.   Pressure and Flow Control

Pressure of the remaining infrastructure is monitored by GWA topsides.

1.   Safety and Emergency Shutdown

The SSIV is interfaced with the GWA combined safety system. The SSIV, tie-in spool and riser are shutdown and preserved as the EY flowline has been removed and is disconnected from the facility.

The existing CONDITIONS of Pipeline Licence WA-9-PL remain as stated in the licence instrument dated 29 October 2001 and varied 23 March 2010.

4. Annexure ‘A’ is deleted and replaced with the map at Attachment 1.

ATTACHMENT 1