RVTI Level 2 Technician Propane Practice Test 2025 – Comprehensive Exam Prep

To effectively purge a propane gas system of air, the proper method is to open the line and allow gas to flow through slowly. This approach is essential because it ensures that any air trapped in the lines is safely displaced by the propane gas. The flow minimizes the risk of creating an explosive mixture that could result from a sudden rush of gas.

Allowing the gas to flow slowly provides a controlled environment for the purging process, reducing the potential for dangerous situations. When the gas flows slowly, it can also facilitate the proper venting of air out of the system. Once the air has been displaced, it confirms that the propane system is ready for safe operation, particularly before starting equipment that relies on gas.

Other methods, such as shutting off the gas supply or using a vacuum pump, do not effectively purge air as they may not create the necessary conditions for the air to exit the system safely. Pressurizing the system could also pose risks and is not considered a safe or effective purging method in this context.