In order to make the best use of changes in the volumetric flow from inlet to outlet, the SST-700 turbine is divided into two different modules: a high-pressure turbine (HP) and a low-pressure turbine (LP), operating at different speeds. The two modules are combined to provide the turbine configuration that is most suitable for a specific application. However, each module can also be utilized on its own, e.g. the high-pressure module can be used as a separate back-pressure unit.
Optimum performance is assured by choosing dimensions for each cylinder appropriate to volumetric flow and by using two different and optimized speeds for the HP and LP turbines. Internally controlled process steam extraction provides a constant extraction pressure over a broad range of steam flows, a feature that makes the SST-700 steam turbines both flexible and easy to operate. Bleed extractions are available and can be equipped with external pressure control valves.
With a symmetrical barrel type casing and small dimensions of the hot parts, resulting in low thermal and mechanical inertia, the SST-700 turbine can accept very short start-up times and rapid load changes.
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