728. The empty weight of a '100 pound' (45.4 kg) cylinder in a fixed CO₂ system is 130 pounds (58.9 kg). What is the minimum acceptable total weight of the cylinder before recharging is required?

A '100 pound' CO2 cylinder contains 100 lbs of CO2 charge; its empty weight is 130 lbs, making the full weight 230 lbs. Recharging is required if the CO2 charge loss exceeds 10%, which is 10 lbs, resulting in a minimum acceptable total weight of 220 lbs.