When filling forklift cylinders by weight, what must be verified at the end of the filling process?

• A. The valve is closed and locked
• B. The cylinder has cooled to ambient temperature
• C. The cylinder is not overfilled at the conclusion of the filling process
• D. The weight reading must match tare weight

Answer: (C)

Filling propane cylinders by weight hinges on controlling how much gas goes in so the cylinder stays within safe pressure limits. Propane expands with temperature, so reaching the correct gross weight (cylinder plus the added propane) ensures you don’t exceed the cylinder’s safety design when it heats up. At the end of the fill, you verify that the weight is at or below the specified maximum fill weight for that cylinder. If the reading is higher than allowed, the cylinder has been overfilled and must not be filled or stored until corrected. This end-of-fill check directly protects against overpressure and potential venting or failure.

Seeing the valve closed and locked is an important safety step, but it’s about preventing leaks after filling, not confirming the fill quantity. The cylinder being cooler than ambient isn’t the criterion for a proper fill, and the weight should not just equal the tare (empty) weight—after filling, the weight must reflect the added propane, not zero.