A method of operating a vapor generating system for use in a power plant having a turbine control valve means, steam turbine and condenser connected in a main flow circuit in a series flow relationship, in which fluid is passed through a vapor generator furnace section at a predetermined flow rate and a firing rate is established in the furnace section to apply heat to the fluid while controlling the pressure of the fluid as it exits from the furnace section. The turbine control valve means are fixed at a predetermined percent open. The firing rate is increased to a predetermined percent of full load firing rate until the firing rate approximately corresponds to the percentage of full load flow rate of the fluid. The fluid flow rate is then increased together with the firing rate in a manner to increase the throttle pressure of the fluid to the turbine in proportion to load demand on the turbine until the load on the turbine reaches a predetermined percentage of full load.
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