Safety devices include ______.

Safety devices are specifically designed to protect individuals and infrastructure from hazardous situations, ensuring safety in operational environments. Hazardous atmosphere alarms are critical safety devices as they are used to detect dangerous gases, vapors, or other conditions that can pose health risks or lead to catastrophic incidents. These alarms alert workers to evacuate or take preventive measures when unsafe conditions are detected, playing a vital role in maintaining safety protocols in environments such as pipeline operations.

In contrast, while tank shells, SCADA systems, and compressors are important components or systems in industrial operations, they do not function as safety devices in the same way that hazardous atmosphere alarms do. Tank shells are structural elements, SCADA is a control system for monitoring industrial processes, and compressors are equipment used to increase the pressure of gases. While they contributed to safe operations indirectly, they do not serve the fundamental purpose of alerting personnel to immediate dangers like hazardous atmosphere alarms do.