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

The method used to check the tightness of fuel gas systems is the pressure test. This test involves increasing the pressure within the gas piping system to a specified level, typically beyond the operational pressure, and monitoring it for a specific duration. If the pressure remains stable and does not drop, it indicates that the system is tight and there are no leaks present.

Pressure testing is crucial for ensuring the integrity of fuel gas systems, particularly during installation and before being placed into service. This ensures safety by preventing potential gas leaks, which can lead to hazardous situations such as explosions or suffocation due to gas accumulation. The accepted standard practices dictate specific procedures for conducting pressure tests, including the types of materials and equipment that can be used.

In contrast, other test methods like flow tests and leak tests serve different purposes. Flow tests assess the system's ability to deliver gas at the required flow rates but do not necessarily indicate the presence of leaks. Leak tests may involve using soapy water or electronic detection methods to identify leaks but are often used in conjunction with pressure tests to verify the system's overall integrity. A safety inspection generally refers to a broader evaluation of safety compliance and does not specifically focus on checking for leaks in the fuel gas systems.