Red Seal Plumbing Practice Exam

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The maximum filling density of any propane container must never exceed what percentage of the water capacity stamped on the container?

  1. 25%

  2. 42%

  3. 55%

  4. 60%

The correct answer is: 42%

Propane containers must never be filled to more than 42% of their water capacity, as stated by the National Fire Protection Association. This is to allow for expansion of the gas as it is exposed to heat or pressure changes. Options A, C, and D are incorrect because they exceed this maximum filling density and could potentially cause safety hazards such as leaks, ruptures, or explosions. Therefore, while it may seem like more propane can fit in the container, it is crucial to adhere to the recommended maximum filling density for safety purposes.

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