Which of the following is not necessary for the safe isolation of a compression refrigeration system?

Memorization of each lockout step is not necessary for the safe isolation of a compression refrigeration system because the emphasis is on following established procedures rather than having every step committed to memory. While familiarity with the lockout steps is beneficial, the focus should be on the correct implementation of safety protocols as documented in the lockout/tagout procedures.

Proper tagging of shut-off valves is essential for indicating which valves are closed or locked out, preventing accidental operation. Ensuring that all personnel are informed is critical to safety, as it helps to mitigate the risk of unintended actions by those who may be near the system during maintenance. Using appropriate personal protective equipment is also vital as it protects individuals working on or near refrigeration systems from potential hazards associated with refrigerants and system pressure. All these elements contribute to a safe working environment, whereas memorization is a less reliable way to ensure safety.