What is the requirement for the pressure range of test gauges used during gas tests?

The requirement for the pressure range of test gauges used during gas tests is that they should have a pressure range no greater than twice the test pressure. This ensures accurate measurement while providing a sufficient margin to accommodate variations in the pressure without risking overloading the gauge.

Using gauges within this range allows for precise readings, which are critical for ensuring safety and compliance with standards during gas testing. If the gauge were to have a range too low, there might be a risk of exceeding its limits without realizing it, leading to dangerous conditions. On the other hand, having a gauge range that exceeds twice the test pressure could compromise the sensitivity of the readings, potentially allowing for inaccuracies in determining if the system is within the acceptable pressure limits.

This approach balances functionality and safety effectively, ensuring reliable measurements while protecting the integrity of the testing equipment.