Engineering Case Study: STG-4 Condenser Issue
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Engineering Case Study: STG-4 Condenser Issue

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@GlamorousJackalope

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Questions and Answers

What event triggered the turbine trip logic in the STG-4 unit?

  • An increase in turbine speed
  • A high level in the condenser (correct)
  • Failure of the steam supply
  • A power supply interruption to the PRDS

    • What was the immediate effect of the condensate pump tripping at the STG-4 unit?

  • The temperature in the turbine increased
  • The condenser level started to climb (correct)
  • The PRDS opened automatically
  • The steam pressure decreased

    • What was the initial operational response of the PRDS upon turbine trip logic activation?

  • To open and direct steam to the condenser (correct)
  • To redirect steam to the cooling towers
  • To close and prevent steam flow
  • To maintain constant pressure for the turbine

    • What corrective action was taken after the critical incident involving the STG-4 unit?

    <p>Manually close the PRDS to mitigate steam flow</p> Signup and view all the answers

    Why was it necessary to update the control logic after the incident?

    <p>To prevent PRDS from opening during high condenser levels</p> Signup and view all the answers

    Which of the following was a direct consequence of the high condenser level in the STG-4 unit?

    <p>The condenser overflowed completely</p> Signup and view all the answers

    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.

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