What test is used to check the tightness of fuel gas systems?

The pressure test is designed to check the tightness of fuel gas systems by applying a known pressure to the system and monitoring for any pressure drops over a specified duration. This is essential for ensuring that there are no leaks in the piping, fittings, or appliances connected to the gas system. By verifying that the pressure remains stable, inspectors can confirm that the system is sealed correctly and there are no points where gas could escape, which is crucial for safety and compliance with building codes.

In contrast, other testing methods like the leak test focus on identifying specific leaks using a mixture of soap and water to visualize escaping gas, while the gas pressure test evaluates the operating pressure of the system rather than its integrity. The term "Safety Inspection Test" does not specifically refer to a standardized testing methodology related to system tightness, making it less applicable in this context. Each of these other options serves different aspects of gas system evaluation, but the pressure test is uniquely suited for assessing tightness.