Which sequence describes a typical startup sequence?

• A. Verify SOP, ensure safety interlocks are active, perform pre-start checks, start controls, monitor for alarms.
• B. Start controls, then verify SOP.
• C. Disable safety interlocks.
• D. Skip checks to save time.

Answer: (A)

In a startup, safety and procedure discipline drive the sequence. The steps are arranged so that the system is confirmed ready before energizing anything, and any issues are caught early.

First, verifying the operating procedure ensures everyone follows the documented steps and requirements for the startup. Then, confirming that safety interlocks are active guarantees protective barriers are in place and will stop the system if something unsafe is detected. Next, performing pre-start checks makes sure conditions are ready—things like proper levels, pressures, lubrication, and instrument status are within safe ranges. Only after these checks are the controls started, energizing the system. Finally, monitoring for alarms provides immediate awareness if any parameter begins to drift or a fault appears, so actions can be taken before problems escalate.

Starting before verifying the SOP undermines the intended, tested procedure. Disabling safety interlocks removes a key safety layer and is dangerous. Skipping checks to save time bypasses critical readiness assessments and risks damage or injury. The sequences that place verification, safety, and checks before starting best support a safe, reliable startup.