Recreational Vehicle (RV) Technician Practice Test

When performing a time pressure drop test using a propane system test kit, which component must be disconnected?

1. Main gas line

2. High pressure line

3. Low pressure line

4. Regulator inlet

The correct answer is: Low pressure line

When conducting a time pressure drop test on a propane system, it is essential to understand the role of various components in the system. The low pressure line is the component that must be disconnected for this specific test. The purpose of the test is to check for leaks and to ensure the integrity of the propane system. By disconnecting the low pressure line, you can effectively isolate the system and accurately monitor the pressure drop without interference from other components. When the low pressure line is disconnected, the remaining pressurized components (including the regulator and high pressure lines) maintain their integrity, allowing you to measure any loss of pressure solely attributable to leaks in the system under test conditions. This focused assessment is crucial for both safety and compliance reasons, as it helps identify weaknesses in the propane delivery system without the extraneous influences of other pressures at play. Other components such as the main gas line and the regulator inlet serve specific functions in the propane setup. They are involved in directing and managing gas flow but do not directly relate to the isolation required to conduct an effective time pressure drop test.