This $27 million project involved installation of water main from the Kenya water treatment plant through to Chinchilla Weir, to dispose of treated CSG water.
|PROJECT OVERVIEW||Moody Civil & Pipe installed 15.6km of 1016mm diameter and 3.6km of 813mm diameter fully welded MSCL Sintalok joint water main from QGC Kenya Water Treatment Plant to Chinchilla, to dispose of treated CSG water to rural irrigators and into the Chinchilla Weir.|
The project included construction of a surge tank, four 9m standpipes and one 3m standpipe, 20 air valve structures, 17 irrigation off-takes, 5 scour structures, an outlet structure, three thrust bored road crossings, design and installation of cathodic protection to the pipeline, 19.2km of fibre optic cable, 160m of DN630 PE100 PN16 pipeline, and mechanical installation of pumps and pipework at the Kenya Water Pumping Station.
|LOCATION||QGC Kenya Water Treatment Plant, Vanrenes Rd, Crossroads to Chinchilla Weir, QLD|
|INDUSTRY SECTOR||Oil, Gas & Energy; Public Utilities (Rural)|
|INFRASTRUCTURE||Water pipelines; Water pump station|
|CONTRACT VALUE||$27.5 million|
|DATES||August 2011 to March 2012|
|SCOPE OF SERVICES PROVIDED||Planning and design|
• Approvals (Council, Environmental etc)
• Early Contractor Involvement (ECI)
• Design Investigation Works
• Service Location
• Design of Portions of Work
• Management of Sub-Contractors (Thrust Boring, Directional Drilling, Traffic Control, Fibre Optic Installation) and Consultant
• Risk and Budget Costing
• Option Analysis
• Project Management
• Stakeholder and Community Liaison
Civil & Mechanical Works
• Mechanical Works – Water Pumping Station
• Restoration Works
• Clearing & Grubbing
• Road Pavement Restoration
|Installation & Construction|
• Pipe and Fittings Supply (at Structures)
• Welded MSCL Pipeline Installation
• PE Pipeline Installation
• Hydrostatic Testing
• Deep Shaft Excavation
• Rock Trenching
• Groundwater Dewatering
• Air Valve Pit Construction
• Scour Valve Pit Construction
• Electrical Conduit and Pit Installation
• Poly Welding (Butt, Electro fusion)
• Weed Control
• Fauna Management
• Siltation and Erosion Control
• Environmental Management during Construction in Environmentally Sensitive Areas
|CHALLENGES||• Assisting Sunwater during the ECI phase to manage budgets due to approval timeframes. Providing scheduling options for construction based on when approvals may be granted.|
• Working to tight timeframes applied during the construction phase due to a delayed project commencement.
• Management of topsoil and excavated spoil in tight construction easements through irrigation areas with crops. Managing owner expectations and requirements, as well as plant and equipment along the construction easement to ensure the highest level of safety.
• Working in and around the Kenya Pump Station with GELOR (construction company building treatment plant for QGC) and maintaining production given the complexity and crossover of work.
|• Installation of pipework through Wambo Creek – high water table and ground conditions (wet running sand).|
• Sourcing bedding sand to meet Sunwater specifications – cost effective and able to be compacted without causing additional compactive effort. Several trials were undertaken during the ECI phase to manufacture a blend that met the above requirements. Moody Civil & Pipe worked closely with sand suppliers and Sunwater engineers.
|ACHIEVEMENTS||• Helping Sunwater achieve the top regional award in the 2013 Queensland Project Management Achievement Awards for the Chinchilla Beneficial Use Scheme.|
• Meeting Sunwater’s ECI timeframes to allow a Risk Adjusted Lump Sum to be provided to QGC for approval prior to construction commencing. This involved regular meetings and open-book pricing to Sunwater for review.
• Achieving a high “As-Commissioned” Cathodic Protection result due to construction methods and quality control applied to the project by Moody. This increased pipeline production.
• Safe and timely installation of pipework through Wambo Creek without environmental harm. This was a result of substantial investigation and planning with Sunwater and specialist consultants, with on site investigation and modelling of groundwater to produce the most cost effective and environmentally suitable dewatering option.
• Completion of the project within agreed timeframes.
|• Development of a pipeline installation methodology that allowed installation of 26m of welded 1016mm pipe (2 x 13m lengths) weighing 10t with a Vacuum Lift assembly.|
• Negotiation of wet weather cost mechanisms with Sunwater during the ECI Phase. As Moody maintained progress ahead of schedule throughout the project construction phase, no wet weather delay costs were incurred, providing substantial savings to the overall project cost.
• Meeting and exceeding requirements of the owners of aligning properties. This was the result of continual communication carried out in person by Moody management.
• Use of Construction Access Branches on the mainline to allow continued installation of the pipeline. This required exposure to the Pentair (formerly Tyco) proprietary item and incorporation into the pipeline design, to reduce the length people had to “crawl” up the pipe to reinstate a welded joint.