Cargannocking Mechanical Upgrade

Project Background

The Cargannocking WPS is used to transfer scheme water from South Kulin tank to North Lake Grace Tank. The existing WPS consists of 2 x centrifugal pumps running in duty/assist mode. The pump suction and delivery manifolds were in very poor condition and have been replaced with a temporary arrangement in copper pipe. The existing switchboards are old and non-compliant.

The pumps are called by the level of the North Lake Grace tank. When the pumps are not running, the system operates under gravity flow.

Scope of Works

• Establishment and control of survey marks and all survey and setting out work.
• Verification (e.g. by testing) of the integrity of all existing infrastructure connection work.
• Supply Verification for each supplied and installed equipment item and including third party product certification, manufacturers test certificates and factory/site acceptance test reports;
• Construction Verification for each component of the Works in accordance with specified requirements including signed-off activity schedules and test reports;
• Pre-commissioning, including associated activity schedules, test reports and a consolidated summary report that details all pre-commissioning work activities and outcomes;Preparation of detailed design drawings of the pump station mechanical upgrade – i.e. replacement of the existing pumps, manifolds and associated valves, fittings, and supports.
• The mechanical design.
• Undertake the Safety in Design process, including combined Operability, Constructability and SiD workshop, and incorporate changes into the design.
• Supply, delivery to site and installation of all associated pump manifold (suction and discharge) pipework, valves and fittings.
• Supply and installation of pressure transmitter on the delivery transfer main.
• Pipework welding & fabrication to clients specification/s.
• Non-return valves.
• Isolating valves.
• Insulated flange kits.
• Manual Sample Points for Water Quality Analysis.
• Installation of other minor valves & appurtenances as required, including earthing studs.
• Construction of concrete slab extension to accommodate the new pump skid and manifolds installation.
• Construction of concrete footings for pipe supports.
• All electrical works associated with connection of the new pump motors to the switchboard and VSDs.
• Connection of the magflow and pressure transmitter instrument signals to the new switchboards.
• Pipework disinfection and pressure tested.
• Enable safe and efficient tie-in of the new works to ensure water supply interruption to customers during construction and commissioning activities is limited to 1 day 8hrs.
• Site Acceptance Testing of work components and witnessed by the representative of the Principal.
• Removal, blank ending & disposal of obsolete pipework.
• Removal and of the existing pumps.
• restoration work at inter-connections with existing water mains.
• Site restoration and reinstatement.
• As-constructed drawings to DS80 standard and asset registration information in the specified template format.
• Preparation & supply of Manufacturers Data Report.