Abstract: A pair of parallel fluid flow connected steam-water drums and associated piping for natural or assisted circulation steam generators including downcomer pipes for receiving water from the drums and being disposed below and in equispaced relationship with the drums. A plurality of supply tubes for connecting the downcomer pipes with each drum, the supply tubes being equally divided between the drums; and a plurality of riser tubes for delivering a steam-water mixture to the drums, the riser tubes being equally divided between the drums.
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