What is the recommended range for a steam pressure gauge?

The recommended range for a steam pressure gauge is typically set at 1.5 to 2 times the operating pressure of the system. This range ensures that the gauge is capable of accurately reading the pressure levels while also providing a margin for safety and avoiding damage.

Having the gauge calibrated within this range allows for optimal performance, where it can indicate normal operating pressures as well as any eventual pressure surges that could occur during operation. A gauge that is rated too low might become saturated or unable to accurately register high-pressure situations, leading to potential safety risks or operational failures.

Therefore, the choice of maintaining the gauge reading in the 1.5 to 2 times range is integral for both safety and reliability in high-pressure boiler operation, making it the correct answer.