Gas Fitter Practice Test

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How much typically does one pound of liquid propane expand when converted to vapor?

  1. Approximately 8.5 cubic feet

  2. Approximately 7.0 cubic feet

  3. Approximately 6.0 cubic feet

  4. Approximately 9.0 cubic feet

The correct answer is: Approximately 8.5 cubic feet

One pound of liquid propane expands to approximately 8.5 cubic feet when converted to vapor. This property is crucial for gas fitters to understand, as it illustrates the significant volume increase that occurs during the phase change from liquid to vapor. Propane is stored as a liquid under pressure, and when it is released, it rapidly evaporates and expands into gas. This transformation is a vital consideration in installation and safety protocols, as the large volume of gas produced can lead to pressure build-up in confined spaces if not properly vented. Understanding this expansion helps gas fitters to calculate the necessary sizing of gas piping systems and ensure that they are designed to handle the full capacity of gas when it is released. This knowledge also aids in preventing hazardous situations, such as vapor accumulation, which can lead to unwanted pressure and potential explosions if not managed appropriately.

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