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In 1993, Siemens relaunched their family of F-class machines as three mutually scaled models with an annular combustor replacing the horizontal silo combustors of the previous models. Both ABB and Siemens, with their F-class gas turbines, had dispensed with the silo combustors and adopted an annular combustor arrangement that reduced the cooling load of the hot-gas path and resulted in a short direct path from the combustors to the turbine inlet. The GE and Westinghouse units retained the can– annular combustion system but with a dry low-emissions burner system in each can.

There is now in effect a merit order of combined cycle. At the top are the single- WPNL2204 40 Generating power at high efficiency shaft combined cycles, many with horizontal natural-circulation boilers and with the lowest production costs at a thermal efficiency between 56% and 58%. These would be considered base-load plants although, as in some parts of Europe and the USA, they may be required to run less frequently because of the contribution of large nuclear and modern coal-fired stations. Below these are the combined cycles of the E-class gas turbines built between 1980 and 1995, with an efficiency of 50–54%.

Powergen, one of the three generating companies, procured its own gas supply and built a pipeline from a terminal at Killingholme on the south Humber estuary, where they had a 900 MW combined cycle, to their Cottam power station, which was converted to dual firing with coal and gas. From Cottam the pipeline ran south to their Rye House combined cycle near Bedford and, from there, past London to their large oil-fired power station on the Isle of Grain. These moves freed up the gas supply and developers did not have to obtain fuel contracts from British Gas, although the gas supply was mostly transmitted through the British Gas trunk mains.

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