Abstract: A cart is provided for safely transporting and storing a single, large, vertically-oriented, cylindrically-shaped canister having a horizontally-oriented base. The vertical and horizontal orientations of the canister and its base, respectively, are constantly maintained throughout the transporting and storing of the canister. The cart includes a stable base. The stable base includes a bottom platform and four wheels operatively connected to the stable base and configured to support the weight of the canister. The stable base is configured to receive and support the horizontally-oriented base of the canister. The cart further includes two side rails extending upwardly from the stable base. A circumferential band is removably attached to the side rails and is configured to encircle and secure from movement the canister, within the cart. The band is at an elevation above the horizontally-oriented base of the canister.

Abstract: A method of filling a cylinder with a target weight of a gas. The method includes successively measuring weight of the cylinder at periodic time intervals to obtain successive actual weights of the cylinder; opening a first valve and filling the cylinder with the gas at a high flow rate; and closing the first valve after reaching a predetermined weight difference between the target weight and an actual weight. After closing the first valve, the method opens a second valve and fills the cylinder with the gas at a low flow rate. After opening the second valve to fill the cylinder with the gas, the method adjustably controls, via an adjustable valve, the flow of gas to the cylinder. The method differences each successively measured actual weight from the target weight of the gas to obtain multiple first difference values. The method also differences adjacently measured actual weights to obtain multiple second difference values.