The maximum permitted filling limit for a cylinder filled by volume is determined by:

• A. The gas supplier
• B. The dispenser operator
• C. The cylinder manufacturer
• D. The customer

Answer: (B)

When filling a cylinder by volume, the person operating the fill is responsible for stopping at the maximum safe volume. The dispenser operator uses the cylinder’s water capacity and a standard safety rule (often around 80% of that capacity for liquids) to ensure the cylinder isn’t overfilled and can safely handle pressure changes with temperature. The operator monitors the volume gauge during the fill and halts the process at that limit, making them the one who determines the maximum fill. The gas supplier provides the propane and the cylinder’s general specifications, and the cylinder manufacturer supplies the physical cylinder, but the actual filling limit in a volume-fill operation is enforced by the dispenser operator. The customer isn’t involved in setting this limit.