Introduction to Surge in Compressors
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Questions and Answers

What is the main benefit of using a microprocessor-based digital control like the Peak 150?

  • It eliminates the need for any external input signals.
  • It requires specialized knowledge to operate.
  • It allows flexible configuration for various control applications. (correct)
  • It increases the cost and delivery time.
  • What signal does the Peak 150 control accept for adjusting turbine speed?

  • A digital signal only.
  • A 4–20 mA remote speed control signal. (correct)
  • A manual override signal.
  • A standard AC power signal.
  • In which operating mode does the Peak 150 control ignore the remote speed setting analog input?

  • Idle speed mode.
  • Remote speed set mode.
  • Manual mode. (correct)
  • Combination mode.
  • What happens when the turbine is at or above minimum governor speed in remote speed set mode?

    <p>The speed will ramp to the remote value at a user-defined rate.</p> Signup and view all the answers

    What is the function of the over-speed trip test capabilities in the Peak 150 control?

    <p>To test the control system's response in an emergency situation.</p> Signup and view all the answers

    Which mode allows for both manual control and remote speed adjustment?

    <p>Combination mode.</p> Signup and view all the answers

    How is the turbine typically started according to the control operation?

    <p>By manually opening the steam-supply valve.</p> Signup and view all the answers

    What occurs if the remote speed setting signal is disabled?

    <p>The last speed will be maintained until manual adjustment is made.</p> Signup and view all the answers

    What is the primary function of the combination mode?

    <p>To compare discrete and analog speed signals for maximum speed</p> Signup and view all the answers

    What is the role of the Programming Unit in the system?

    <p>To configure system constants securely</p> Signup and view all the answers

    How does the system handle speeds within the critical speed band?

    <p>It prohibits any changes until the speed is outside the band</p> Signup and view all the answers

    Which input does not fall under the category of pickup inputs?

    <p>Analog input for remote speed setting</p> Signup and view all the answers

    What does the analog output provide?

    <p>Operational and configurable readout signals</p> Signup and view all the answers

    Which function is NOT available through the operator control panel?

    <p>Remote speed control</p> Signup and view all the answers

    What is the maximum allowed input frequency for pickup inputs?

    <p>15 kHz</p> Signup and view all the answers

    What type of communication protocol is an option for the Peak 150?

    <p>Modbus®</p> Signup and view all the answers

    Which relay output function can be configured?

    <p>Shutdown operations</p> Signup and view all the answers

    What is the minimum voltage requirement for pickup inputs?

    <p>1 Vrms</p> Signup and view all the answers

    What is required for programming the Peak 150 control?

    <p>A hand-held programmer</p> Signup and view all the answers

    Which communication protocols are supported by the Peak 150 control?

    <p>RS-232, RS-422, and RS-485</p> Signup and view all the answers

    What must be ensured regarding overspeed protection when using the Peak 150 control?

    <p>It must be a completely separate device</p> Signup and view all the answers

    What happens if you don’t save set points before removing power from the Peak 150 control?

    <p>They will revert to previously saved settings</p> Signup and view all the answers

    In which mode can the transmission for the Peak 150 control be set?

    <p>RTU or ASCII mode</p> Signup and view all the answers

    What is the danger associated with improperly configuring the Peak 150 control?

    <p>It can lead to overspeed conditions</p> Signup and view all the answers

    What key warning must be observed regarding the Peak 150 control when in a hazardous atmosphere?

    <p>Do not open the control box</p> Signup and view all the answers

    When should the turbine not be started according to the guidelines for Peak 150 control?

    <p>Before programming has been completed</p> Signup and view all the answers

    What type of control system is the Woodward Peak 150 designed to manage?

    <p>Single-valve or single-valve rack steam turbines</p> Signup and view all the answers

    Which aspect is NOT included in the training for the CCC A3 Anti-Surge Controller?

    <p>Configuration of microcontrollers</p> Signup and view all the answers

    In what mode is control achieved through user input in the Peak 150 system?

    <p>Manual Mode</p> Signup and view all the answers

    What is an essential part of the programming process for the WW Peak 150 Controller?

    <p>Understanding Modbus Communication</p> Signup and view all the answers

    What is the main focus of the training during Weeks 5 to 8?

    <p>CC A3 Anti-Surge Controller operation</p> Signup and view all the answers

    Which component is reviewed in the context of the ProMistic Control System?

    <p>Logic Review</p> Signup and view all the answers

    What is the primary role of the Anti-Surge Control System?

    <p>To prevent surges in compressors</p> Signup and view all the answers

    Which of the following is NOT a focus of Hands-on Work sessions scheduled for weeks 13 to 16?

    <p>Troubleshooting electrical circuits</p> Signup and view all the answers

    Which type of communication is included in the training for the Peak 150?

    <p>Modbus Communication</p> Signup and view all the answers

    What is an essential factor when diagnosing faults in the Woodward Peak 150?

    <p>Ability to interpret wiring drawings</p> Signup and view all the answers

    Which term is defined as an uncontrolled increase in the output of a compressor?

    <p>Surging</p> Signup and view all the answers

    Which training component is focused on understanding specific wiring layouts for troubleshooting?

    <p>P&amp;ID Review</p> Signup and view all the answers

    What type of algorithms are involved in the CCC A3 Anti-Surge Controller?

    <p>Surge control algorithms</p> Signup and view all the answers

    What is the maximum baud rate configuration option available for the Modbus Port?

    <p>19200 Baud</p> Signup and view all the answers

    Which Modbus Port Stop Bit Configuration option indicates a format with two stop bits?

    <p>2 Stop Bits</p> Signup and view all the answers

    Which parity option indicates a standard where the parity bit is not used?

    <p>Off Parity</p> Signup and view all the answers

    What type of hardware configuration uses RS 485?

    <p>Multi-drop communication</p> Signup and view all the answers

    How many options are available for Modbus Port Baud Rate Configuration?

    <p>6</p> Signup and view all the answers

    Which DI indicates the status of the external trip feature?

    <p>DI #3</p> Signup and view all the answers

    What status does the Tripped LED indicate?

    <p>A fault has occurred</p> Signup and view all the answers

    Which configuration is not an option for Modbus Port Parity?

    <p>No Parity</p> Signup and view all the answers

    Which relay status option indicates that a configuration relay is turned on?

    <p>Conf Rly #1 ON</p> Signup and view all the answers

    Which stop bit configuration option provides a middle ground between one and two stop bits?

    <p>1.5 Stop Bits</p> Signup and view all the answers

    Study Notes

    Introduction to Surge

    • Surge is a phenomenon that occurs in centrifugal compressors.
    • Centrifugal compressors move air or gas utilizing a rotating impeller.
    • The rotating impeller creates pressure by accelerating the gas and causing it to flow into a diffuser, where the velocity of the gas is reduced, and pressure increases.
    • During operation, the compressor can reach a point where the gas velocity in the flow path changes to a different state, causing excessive vibration and noise.
    • The change in flow path is characterized by a sudden decrease in the speed at which the gas is flowing. This decrease in speed is known as a surge.
    • Surge can cause serious damage to the compressor if not properly controlled and mitigated.

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    Description

    This quiz delves into the phenomenon of surge in centrifugal compressors, exploring how the rotating impeller influences gas movement and pressure. It discusses the implications of surge, including its causes and potential damage to the compressor if not managed effectively.

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