HDS Unit Operations and Procedures Quiz
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Questions and Answers

What is the purpose of blocking in the 180 psig steam at the Stripper Tower Feed Preheater (13EX-2339)?

  • To prevent excessive temperatures in the Stripper Tower. (correct)
  • To increase the pressure within the Stripper Tower.
  • To prevent backflow through a possible failed check valve.
  • To ensure proper operation of the Stripper Tower.

    • What is the purpose of shutting down the Hydrogen Compressor (13C-101/102)?

  • To reduce the pressure within the Reactors.
  • To bring the Unit to a safe state. (correct)
  • To prevent excessive temperatures in the Stripper Tower.
  • To prevent backflow through a possible failed check valve.

    • What is the first step in the Supplementary Actions?

  • Close isolation valves on the lean amine supply.
  • Shut down all applicable pumps.
  • Block in the discharges of the Feed Charge Pumps. (correct)
  • Monitor instrument air pressure.

    • What is the purpose of closing the isolation valves on the lean amine supply to the Absorber (13PV-2306)?

    <p>To isolate the Absorber from the rest of the unit. (A)</p> Signup and view all the answers

    What is the primary concern after the Unit has been shut down and stabilized?

    <p>Assessing the condition of the Unit. (C)</p> Signup and view all the answers

    What is the first step to take in the event of a loss of instrument air in the #3 HDS unit?

    <p>Close isolation valves for the lean amine supply and rich amine exiting the Absorber. (C)</p> Signup and view all the answers

    What should be done once instrument air has returned, depending on the duration of the outage?

    <p>Evaluate the unit condition to decide whether to continue shutting down or prepare for start-up. (A)</p> Signup and view all the answers

    Which of the following procedures are referenced for unit shutdown and start-up after an emergency shutdown?

    <p>SOP-3HDS-201 and SOP-3HDS-102 (C)</p> Signup and view all the answers

    What is the primary purpose of the Sinclair LOTO procedure?

    <p>To safely isolate and energy sources to equipment before starting maintenance. (A)</p> Signup and view all the answers

    What is the recommendation regarding this document after the procedure is completed?

    <p>It should be discarded. (B)</p> Signup and view all the answers

    Where should non-essential personnel go when there is a loss of instrument air in the #3 HDS Unit?

    <p>To the nearest safe location outside the unit area (C)</p> Signup and view all the answers

    What is the initial action to take when the unit depressurizing valve malfunctions and goes to a failed open position?

    <p>Block the inlet valve to the depressurizing valve (B)</p> Signup and view all the answers

    What happens to the control valves on the #3 HDS Unit when instrument air is removed?

    <p>They automatically revert to a fail-safe position (D)</p> Signup and view all the answers

    Which of the following departments should NOT be notified in case of instrument air loss in the #3 HDS Unit?

    <p>Production Department (D)</p> Signup and view all the answers

    What is the primary concern in cases of extreme pressure drop in the #3 HDS Unit?

    <p>Major liquid swing throughout the entire unit (D)</p> Signup and view all the answers

    Flashcards

    Instrument Air Loss Notification

    Immediate notification to all personnel to evacuate the unit area.

    Departments to Notify

    Key departments that must be informed about the loss of instrument air.

    Control Valve Fail Safe

    Control valves revert to a safe position when air pressure is lost.

    Immediate Actions on Valve Failure

    Block the inlet valve if the depressurizing valve fails open.

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    Condition Assessment

    Check the unit's condition and block fuel gas valves after air loss.

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    Closing Isolation Valves

    Shut off lean and rich amine supply to the Absorber.

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    Evaluating Unit Condition

    Assess unit state after instrument air restoration to decide next steps.

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    Preparation for Maintenance

    Use Sinclair LOTO and safety policies before equipment work.

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    SOP-3HDS-201

    Standard Operating Procedure for Normal Unit Shutdown.

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    SOP-3HDS-102

    Standard Operating Procedure for Normal Unit Start-up after Emergency Shut Down.

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    Hydrogen Compressor Shutdown

    The action of shutting down Hydrogen Compressors (13C-101/102) during an emergency.

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    Pump Shutdown

    The process of shutting down all applicable pumps to ensure safety during emergencies.

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    Monitor Reactor Temperatures

    Closely observing temperatures in the reactors (13PV-2301/2302) during an emergency.

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    Block Feed Charge Pumps

    Blocking in the discharges of the Feed Charge Pumps (13P-101/102) to prevent backflow.

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    Close Isolation Valves

    Shutting isolation valves for amine supply and exit to control chemical flow.

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