5 a small assumed to be 1 percent bypass flow 8 is directed from the main feedwater stream this mixes with a like amount of water from the separator 5 and enters the storage tank 3 the flow from the storage tank 3 is returned to the separator 5 via the circulation pump 1 completing the circuit the main feedwater flows directly into the evaporator 4 where it is converted to 90 percent quality steam within the separator 5 the 10 percent moisture is removed and all the steam is transported to the superheater 7 the 10 percent water plus the previously discussed one percent bypass flow 8 are blown down through a topping heat recovery feedwater heater 9 through the low pressure feedwater heaters not shown and to the condenser not shown all flow from the condenser is through a full flow demineralizer not shown to obtain the required feedwater purity a schematic of the combined cycle when operating in a recirculation mode is shown in fig2 in a recirculating mode the circulation pump 1 speed is increased to provide the circulation ratio desired taking as an example operating at the very low circulation ratio of 1 1 1 the ratio of flow entering the evaporator 15 to the steam flow 16 fig2 and with the steam leaving the separator 5 defined as 100 percent the feedwater flow for this condition would be 105 percent this flow is split prior to entering the mixing tank 6 with 5 percent bypass going to the storage tank 3 and 100 percent to the mixing tank 6 the circulation pump 1 would be delivering 10 percent flow from the storage tank.