How must the mechanical gauges used for pressure tests be rated?

The mechanical gauges used for pressure tests must be rated to handle up to 5 times the test pressure to ensure safety and reliability during the testing process. This rating is crucial because it provides a safety margin that helps prevent gauge failure, which could occur if the pressure exceeds the gauge's capacity. By using gauges capable of withstanding pressure well beyond the maximum expected level, operators can avoid dangerous situations such as gauge bursts or inaccuracies that could lead to unsafe working conditions.

The designs of pressure gauges incorporate various standards that recommend a specific overload capability to enhance the safety and longevity of the instruments. Therefore, ensuring that gauges are appropriately rated in this manner not only conforms to industry standards but also contributes to the overall safety protocols involved in pressure testing.