Which of the following conditions indicates a potential safety hazard that may necessitate a shutdown?

Low pressure is a critical condition that can indicate a potential safety hazard, particularly in systems that rely on maintaining specific pressure levels for safe and efficient operation. In many systems, especially those involving boilers, steam, or gas lines, low pressure can lead to issues such as the inability to move fluids effectively, which could result in overheating, equipment damage, or even system failure.

When pressure drops below designated safety thresholds, it can compromise the integrity of the system, leading to dangerous situations such as the risk of a vacuum forming or an inability to prevent backflow of hazardous substances. Therefore, operators must monitor pressure levels closely and may be required to initiate a shutdown to prevent accidents or equipment failure if low pressure is detected.

Normal temperature and regular levels signify that the operational parameters are within design limits, and high flow could indicate a system working efficiently rather than presenting a hazard unless accompanied by other concerning factors.