During normal operation, two cylinders are staged on weigh scales and each is connected to the process with two 0.25-inch diameter by 48-inch long PTFE-lined, 304 stainless steel overbraid hoses. One hose transfers liquid phosgene to a steam vaporizer and one provides 70-psig nitrogen to the cylinder. The scales record the weight of the in-service cylinder and when the container is nearly empty, an alarm notifies the board operator, who then directs operators to switch to a full cylinder. This switch is completed by opening valves to the full cylinder and closing valves to the empty cylinder. The hoses remain coupled in this operation, and plant SOPs do not require enhanced PPE such as a fully encapsulated suit and breathing air. Under normal operating conditions, the process consumes two to three cylinders of phosgene per day.