Which statement about DOT cylinders is true?

Which statement about DOT cylinders is true?

• A. They may be transported at fill capacity, have to be requalified, and they are filled by weight
• B. They are never requalified
• C. They are filled by volume
• D. They must be used only for beverages

Answer: (A)

DOT cylinders are filled by weight rather than by volume, and they must be periodically requalified to ensure the cylinder walls remain safe under pressure. Weighing the cylinder after adding propane guarantees the correct amount of gas is inside, because a liquid’s volume can change with temperature, while the weight is a reliable measure of how much gas is present. These cylinders are designed to be transported with their contents up to the allowed fill capacity, as long as all safety rules (proper labeling, securing, and no overfill) are followed. The idea of filling by volume is not how these cylinders are managed, and these cylinders are not limited to beverages.

DOT cylinders are filled by weight rather than by volume, and they must be periodically requalified to ensure the cylinder walls remain safe under pressure. Weighing the cylinder after adding propane guarantees the correct amount of gas is inside, because a liquid’s volume can change with temperature, while the weight is a reliable measure of how much gas is present. These cylinders are designed to be transported with their contents up to the allowed fill capacity, as long as all safety rules (proper labeling, securing, and no overfill) are followed. The idea of filling by volume is not how these cylinders are managed, and these cylinders are not limited to beverages.