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Otara Gas Turbine Otara Gas Turbine Station Station By Doug St George, Assistant Engineer with NZ Electricity Dept
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Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

Mar 31, 2015

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Page 1: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

Otara Gas Turbine Otara Gas Turbine StationStation

By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

Page 2: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

This power station was built with 4 Stal-Laval gas This power station was built with 4 Stal-Laval gas turbines, each of 50 Megawatts, or about 67,000 turbines, each of 50 Megawatts, or about 67,000 horsepower. The first turbine was dual-fuel, to run on horsepower. The first turbine was dual-fuel, to run on either Kapuni natural gas, or diesel and was cooled by either Kapuni natural gas, or diesel and was cooled by fresh water with cooling towers. Units 2,3 and 4 were fresh water with cooling towers. Units 2,3 and 4 were cooled by salt water from the Otara creek nearby.cooled by salt water from the Otara creek nearby.

Page 3: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

The turbine unit comprised a gas generator, on the left, The turbine unit comprised a gas generator, on the left, with separate low and high pressure compressors, twin with separate low and high pressure compressors, twin vertical combustion chambers, with piping above and vertical combustion chambers, with piping above and below the floor leading to the power turbine, driving the below the floor leading to the power turbine, driving the generator. Starting was by compressed air blowing into generator. Starting was by compressed air blowing into the low pressure compressor.the low pressure compressor.

Page 4: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

The generator shaft had a free-wheel coupling to allow the The generator shaft had a free-wheel coupling to allow the generator to be run at 3000 RPM on its own, as a generator to be run at 3000 RPM on its own, as a synchronous condensor, for voltage control.synchronous condensor, for voltage control.

Page 5: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

Some views follow, taken from the top of one of the Some views follow, taken from the top of one of the exhaust stacks. The Otahuhu Sub-Station building can exhaust stacks. The Otahuhu Sub-Station building can be seen, where remote start switches were fitted. The be seen, where remote start switches were fitted. The turbines could be generating full power in a few minutes turbines could be generating full power in a few minutes after pressing start.after pressing start.

Page 6: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

A view of the Otara Creek, used for salt water cooling, A view of the Otara Creek, used for salt water cooling, and the salt-water pumphouse.and the salt-water pumphouse.

Page 7: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

A view of the cooling towers for turbine # 1.A view of the cooling towers for turbine # 1.

Page 8: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

The control room for the Otara Turbine Station. The control room for the Otara Turbine Station. In 1969, the equipment included relay control In 1969, the equipment included relay control panels and solid-state turbine governors, made panels and solid-state turbine governors, made of discrete components (before integrated of discrete components (before integrated circuits, silicon chips and computers were circuits, silicon chips and computers were invented)invented)

Page 9: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

The NZED’s 1946 The NZED’s 1946 Bedford truck for use Bedford truck for use by the Assistant by the Assistant Engineers, Bob Eagle Engineers, Bob Eagle and Doug St George. and Doug St George. We had use of it when We had use of it when it was not being used it was not being used for blocking a hedge in for blocking a hedge in Henderson.Henderson.

Page 10: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

After leaving the NZED After leaving the NZED in 1969 I worked for in 1969 I worked for Stal-Laval in Sweden. Stal-Laval in Sweden. This is a picture of the This is a picture of the same type of turbine same type of turbine installed in installed in HämeenlinnaHämeenlinna, in , in Finland. Others were Finland. Others were installed in China and installed in China and VästervikVästervik, Sweden., Sweden.

Page 11: Otara Gas Turbine Station By Doug St George, Assistant Engineer with NZ Electricity Dept 1967 to 1969.

And now in 2007? In the And now in 2007? In the 1970’s two more gas turbine 1970’s two more gas turbine units were installed, but the units were installed, but the Government chose aero-Government chose aero-engine types as they had engine types as they had found the Stal-Laval units did found the Stal-Laval units did not start up reliably when not start up reliably when needed. Two more chimneys needed. Two more chimneys were added to the western were added to the western end of the station. The end of the station. The chimneys for the Stal-Laval chimneys for the Stal-Laval units have since been units have since been removed.removed.

Otahuhu B combined cycle Otahuhu B combined cycle power station has been built power station has been built nearby.nearby.