Benmore Hydraulic Structures Upgrade
Tender Overview
About this tender
Overview Meridian Energy Limited is seeking a contractor to deliver the Benmore Hydraulic Structures Equipment Upgrade (BEN HSEU) project, involving the replacement and upgrade of ageing control equipment associated with the Benmore Hydraulic Structures. About The Benmore Hydraulic Structures and associated equipment are critical to the safe operation of the Benmore reservoir and earth dam. They provide safe passage of water flow from the dam through four radial arm spillway gates and two vertical sluice gates via a spillway chute that discharges into the Waitaki river downstream of the dam. The gate control system allows for both remote control (from Generation Controllers or the Benmore control room) and local control by maintenance staff at the structure. Physical operation of the gates is achieved through a combination of electrical, mechanical, hydraulic and PLC systems located on and in the structure itself. Because of their importance in managing the safety of the dam structure, the overall system is classed as a Dam Safety Critical System (DSCS), with its equipment classed as Dam Safety Critical control equipment. The current control equipment, except for the Programmable Logic Controller (PLC), is original. Purpose The BEN HSEU project seeks to replace ageing equipment, improve reliability, optimise access and layouts, maintain relevant dam safety requirements, and improve the efficiency of ongoing maintenance associated with the system. Scope The scope includes the following major work packages: Construction of a new external control building Installation of a new water level site with access walkway Improvement and optimisation of the 400V LVAC power distribution system Strengthening of the backup diesel generator shed, provision of active ventilation, and installation of an external fuel tank Upgrade of the power supply, hydraulic system and controls for the spillway gate lifting system Replacement and relocation of the sluice gate hydraulic power units, including a new enclosure Replacement of the sluice gate level indicators and control system Installation of new or replacement controls for the sluice gates and spill gates
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