Abstract: Various embodiments include systems for controlling the flow of main steam from a high-pressure (HP) turbine to a turbine packing. In some cases, a system is disclosed including: a high pressure (HP) turbine including a plurality of stages, the plurality of stages including an early stage, a middle stage and a later stage; an intermediate pressure (IP) turbine operably connected with the HP turbine; a packing separating the HP turbine and the IP turbine; a main conduit fluidly connecting the middle stage of the HP turbine and the packing, the main conduit including a main valve; and a bypass conduit fluidly connected to the main conduit and bypassing the main valve, the bypass conduit including: a blocking valve; and an opening between the blocking valve and a downstream connection with the main conduit.

Abstract: Various embodiments include systems for controlling the flow of main steam from a high-pressure (HP) turbine to a turbine packing. In some cases, a system is disclosed including: a high pressure (HP) turbine including a plurality of stages, the plurality of stages including an early stage, a middle stage and a later stage; an intermediate pressure (IP) turbine operably connected with the HP turbine; a packing separating the HP turbine and the IP turbine; a main conduit fluidly connecting the middle stage of the HP turbine and the packing, the main conduit including a main valve; and a bypass conduit fluidly connected to the main conduit and bypassing the main valve, the bypass conduit including: a blocking valve; and an opening between the blocking valve and a downstream connection with the main conduit.