Which failure modes are commonly observed in automated control systems in oil and gas facilities?

• A. Sensor drift, actuator sticking, loss of communication, and cyber vulnerabilities are common failure modes.
• B. Only mechanical wear.
• C. No failures due to safeguards.
• D. Operator error is the only concern.

Answer: (D)

Automated control systems in oil and gas facilities fail in several ways that span sensing, actuation, communications, and cybersecurity. Sensors can drift or calibrate inaccurately, so the control system makes decisions based on faulty data. Actuators can stick, jam, or respond sluggishly, causing commanded changes not to translate into the expected physical action. Communication networks can lose data or experience latency, breaking the feedback loop that keeps the process aligned with setpoints. Modern facilities also face cyber vulnerabilities because networked control systems can be exposed to unauthorized access or malware, enabling manipulation of readings, commands, or logic. Because of this mix of hardware, software, and network factors, failures are not limited to one component or to manual error alone. The option that captures these common failure modes best recognizes the broad range of risks present in automated control systems.