Podcast
Questions and Answers
What event triggered the turbine trip logic in the STG-4 unit?
What event triggered the turbine trip logic in the STG-4 unit?
What was the immediate effect of the condensate pump tripping at the STG-4 unit?
What was the immediate effect of the condensate pump tripping at the STG-4 unit?
What was the initial operational response of the PRDS upon turbine trip logic activation?
What was the initial operational response of the PRDS upon turbine trip logic activation?
What corrective action was taken after the critical incident involving the STG-4 unit?
What corrective action was taken after the critical incident involving the STG-4 unit?
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Why was it necessary to update the control logic after the incident?
Why was it necessary to update the control logic after the incident?
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Which of the following was a direct consequence of the high condenser level in the STG-4 unit?
Which of the following was a direct consequence of the high condenser level in the STG-4 unit?
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Study Notes
STG-4 Condenser Issue Overview
- The STG-4 unit is one of four steam turbines at FPCL's power plant.
- A power supply issue affected the condensate pumps, vital for regulating water levels in the condenser.
- The failure of the condensate pump led to a rise in the condenser level due to inadequate water removal.
Consequences of the Pump Trip
- An elevated condenser level triggered the turbine trip logic.
- According to operational standards, a turbine trip necessitates the opening of the PRDS (Pressure Reducing and Desuperheating Station) to redirect excess steam.
- In this case, the PRDS opening contributed to the condenser level reaching 100%, compounding the already critical situation.
Resolution Actions
- The PRDS was manually closed to halt further increase in the condenser level.
- A review of the control logic revealed flaws necessitating immediate updates.
- The updated control logic now prevents the PRDS from opening during a turbine trip when the condenser level is already high, mitigating future risks.
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Description
This quiz explores a critical engineering case study involving the STG-4 steam turbine at FPCL's power plant. It examines the failure of the condensate pump and the implications for the plant's control systems. Test your understanding of the operational challenges and technical solutions presented in this scenario.
