Coordinating interconnected steam headers is impossible without automatic control. A major upset on one header can cascade throughout the system causing multiple equipment failures and eventual plant outage. A control strategy that coordinates turbines, boilers, and reducing valves can balance a multiple header system during normal operation and prevent a catastrophic failure during a major upset.
Coordinated control of the pressure reducing valves (PRVs) is the most effective too for stable header control. Proper configuration of override controls and limiters keep the valves closed until needed. Interfaces with the Woodward TG governor systems coordinate the PRVs with TG extraction to allow PRVs to take over when the TGs are unavailable.
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