Which element is not included in the safe operating procedure for draining oil from an ammonia refrigeration system?

The use of system pressure to facilitate the drain is not included in the safe operating procedure for draining oil from an ammonia refrigeration system because the application of system pressure can create hazards. It poses risks such as accidental release of ammonia, which is a toxic refrigerant, and could lead to high-pressure oil mist being expelled unintentionally. Safe operating procedures prioritize minimizing risks during maintenance processes, including draining oil, which should be done safely and efficiently without relying on pressurized conditions that could lead to operational hazards.

Proper collection containers for the oil, identification of potential leak points, and notification of service personnel are essential components of the safe operating procedure. Using appropriate containers ensures that the oil is collected without spillage, identifying leak points helps to manage risks and allows for preventative measures to be taken, and notifying service personnel ensures that trained individuals are aware of the operation, which contributes to safety and effective communication within the workplace.