The turbine extractor is put into operation
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Why is it necessary to activate the secondary vacuum pump first, and then the primary vacuum pump?
Look at the diagram carefully: the waste steam from stage 1 goes to stage 2 and then is extracted. If stage 1 is activated first, there will be no way for the steam to flow out, making it difficult to extract it and potentially leading to pressure buildup
It shouldn’t be possible to hold back the pressure; there is a normally open drain valve below the stage 1 cooler. I thought about it yesterday – should we put Stage 1 into use first? In that case, the condensate and some non-condensable gases would return to the surface cooler through the bottom drain valves, which would affect the establishment of vacuum.
You’ll understand once you see where the air valve is connected.