Sydney Primary Loop

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Jemena’s Sydney Primary Loop (SPL) is a 29km DN500 pipeline which runs through south western suburbs of Sydney from a connection to an existing section of the DN550 primary loop pipeline at Casula and ties in into the existing DN550 primary main pipeline at Marrickville.  The SPL pipeline connects two major Jemena Gas Networks primary mains, thus enabling continuity and reliability of gas supply if the supply on either is interrupted.  The SPL pipeline also provides further opportunity for development of the gas distribution network in Sydney area.

The facilities and stations on the SPL pipeline include Automatic Line Break (ALB) main line valve stations, a Primary Regulator Station (PRS) at Moorebank and a Trunk Receiving Station (TRS) at West Hoxton.  GHD was selected by Jemena to undertake engineering design and construction support for the pipeline and associated stations.

The most challenging aspect of the project was designing and constructing through a densely populated urban environment.  As a consequence the design was subject to particularly stringent requirements in order to minimize risk to the public.  The design incorporated new requirements from the draft version of AS 2885.1-2007 as its release was imminent during design.  The design was affected in many aspects including main line valve spacing, fracture control, wall thickness calculations and isolation plans.

Construction was completed in early 2008.

Hydrocarbons Processing

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Hydrocarbon Processing facilities handle products which are flammable and hazardous and often at elevated pressures and temperatures. We have a direct interest in the various aspects of process hazard management – pipeline risk assessments, HAZOP study, SIL/LOPA study, Consequence Modelling of hazardous incidents (e.g. gas dispersion and thermal radiation). Our activities include the revalidation of previously completed process hazard analysis studies.

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Hydrocarbons Transportation

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Community expectations demand that pipelines and facilities are designed and constructed in such a way that the risk of harm to the public is minimised.  Pipelines projects must also be delivered with minimum impact on the environment and cultural heritage whilst providing a return on investment for pipeline owners.

Pipeline and associated facility design and maintenance are subject to stringent codes and regulatory requirements which aim to achieve safe operation through design life.

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