This publication describes the design, installation, filling, use, and maintenance stationary uninsulated cylinder carbon dioxide supply systems with a total usable capacity of 1500 lb (680.4 kg) or less. These systems employ the use of two or more cylinders with a directional flow control device, allowing the system to function like a single cylinder. These systems are unique in the fact that this publication describes cylinders filled in place, unlike the filling procedures described in CGA G-6.3, where cylinders are filled individually by weight. This publication also addresses the hazards associated with stationary uninsulated carbon dioxide cylinder supply systems.