Which device should not have a higher range than 1.5 to 2 times the safety valve setting?

The correct choice pertains to pressure gauges, which should not be set to a range higher than 1.5 to 2 times the safety valve setting for crucial safety and operational reasons.

Pressure gauges are designed to measure the pressure of gases and liquids within systems, and if their range exceeds this limit, there is a risk of producing inaccurate readings. This can lead to poor decision-making regarding system safety and operation. Exceeding the safety valve's setting can compromise the functionality of the system's pressure relief, potentially allowing pressures to rise beyond safe levels, which may result in hazardous situations like equipment failure or safety incidents.

Maintaining a gauge range that aligns closely with the safety valve setting ensures that the gauge can accurately reflect the actual operating conditions, allowing for timely corrective actions. This is an integral part of plant operations, where monitoring pressure levels is crucial to maintaining safety and efficiency.

In contrast, temperature gauges, flow meters, and level sensors typically operate under different parameters and do not necessarily face the same limitations related to safety valve settings as pressure gauges do. These devices are designed with varying measurement ranges and are subject to different operational criteria, which means their maximum ratings can differ significantly from those of safety valves.