Which method is used to fill one-pound cylinders?

One-pound cylinders are typically filled using the gravity fill method because it effectively uses the force of gravity to ensure that the liquid propane (LP-Gas) flows into the cylinder from the filling source. During the filling process, the cylinder is placed in a position that allows gravity to assist in moving the liquid gas into it, ensuring optimal filling without requiring additional pressure methods.

This method is particularly suited for smaller cylinders, as it minimizes the risk of overfilling and allows for better control over the fill process. In addition, the gravity method is often safer for smaller cylinders when compared to pressurizing methods, which can pose higher risks if not closely monitored.

Other methods, like vacuum fill, pressure fill, or centrifugal force, are generally reserved for larger storage tanks and are not appropriate for one-pound cylinders. These methods could introduce complexities or hazards that are unnecessary and potentially dangerous in the context of filling small portable cylinders.