To what value should a pressure gauge be graduated?

The correct answer indicates that a pressure gauge should be graduated to a value of 2 times the Maximum Allowable Working Pressure (MAWP), but it should not exceed 3.5 times the MAWP. This approach ensures accuracy and safety in steam boiler operations.

Graduating the gauge to 2 times the MAWP allows for a more accurate measurement and gives an adequate margin for pressure fluctuations during operation. It also provides a buffer for any potential surges in pressure that may occur. However, if the gauge is graduated to more than 3.5 times the MAWP, it may result in decreased readability and an inability to effectively monitor the operational pressures within the safe limits set for the equipment.

The context of higher graduation limits serves to avoid inaccurate pressure readings, which can have safety implications. Graduating to these values provides guidelines not just for effective monitoring but also for maintaining the integrity and safety of the steam boiler system. Therefore, the specified range of graduation is crucial for ensuring operational safety and compliance with relevant standards and regulations.