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4Copyright: Chart Industries, Inc., Jan. 2003 carbon dioxide from changing to ‘dry ice,’ the solid form of CO2. However, internal pressure that is too high can cause venting and diffi culties refi lling the vessel. The “economizing” process is controlled by a regulator that monitors the vessel’s internal pressure. When the vessel pressure exceeds the set point of the regulator (factory set at 140 psi), the regulator opens allowing CO2 gas to fl ow directly into the gas use circuit whenever CO2 gas is being used. By taking gas from the top of the vessel instead of liquid CO2 from the bottom, the internal pressure of the tank is reduced and controlled. Safety Vent Circuit The inner pressure vessel of this storage system is designed to meet or exceed the ASME Section VIII, Division 1 pressure vessel code. The code dictates that the vessel be protected against excess pressure by a safety relief valve. Chart uses two safety relief valves for added safety; an ASME relief valve set at 300 psig and an additional relief valve set at 450 psig. The relief valves must always be vented outdoors by a vent tube, usually through the fi ll box, to prevent potential concentration of CO2 within the building. The 300 psig relief valve may open during CO2deliveries or when CO2 is not being used regularly. Pressure And Contents Gauges A contents and pressure gauge indicate the status of the CO2 inside the vessel. The vessel pressure gauge measures the pressure in the top space of the inner vessel. This pressure can normally range between 125 psig and 300 psig but the typical vessel operating pressure is 125 to 150 psig. The vessel contents gauge measures the approximate level of CO2 liquid in the vessel. The movement of a magnetic rod “fl oating” in the liquid CO2 causes the needle on the contents gauge to move as the level of liquid CO2 in the vessel changes. NOTE: Because the fl oat-rod does not actually fl oat on the surface of the liquid CO2 it does not provide a precise measurement of liquid CO2 level. CO2 Fill Box The stainless steel CO2 fi ll box is the second major element of the Carbo-Max 750 CO2 storage system. The purpose of the fi ll box is to provide a convenient point to fi ll the storage vessel and to vent excess vessel pressure out of the building. The fi ll box has a brass fi ll fi tting, a connection for the safety relief vent circuit, a connection point for a safety clip, and a lockable door. Two standard types of fi ll boxes are available; a surface-mount model and a fl ush-mount model. Fill boxes must be mounted outside the building where they are easily accessible to the CO2 supplier and where they can safely disperse excess CO2 pressure outdoors. Fill Hose And Vent Line The third major element of a stationary bulk CO 2system is comprised of a fi ll hose and vent line. These two lines join the CO2 storage vessel with the outdoor fi ll box. The fi ll hose is a pressure rated line that connects the brass fi ll fi tting in the fi ll box to the fi ll circuit on the vessel. It is constructed with FDA compliant materials, The vent line is as important as any component in the system. It connects the safety relief valves on the vessel to either the outdoor fi ll box or to an alternative outdoor vent tube. NOTE: The Carbo-Max 750 must always be connected to an outdoor vent line when it contains CO2 and is indoors. The Bulk CO2 Supplier The bulk CO2 supplier is also an important part of the system. Most CO2 suppliers not only provide timely delivery of CO2 but also install and service the system. For service, parts, information, emergency CO2 delivery, or other CO2 related assistance, contact the local Chart authorized CO2 supplier. A place has been designated on page 14 of this manual to record the name and phone number of the CO2 supplier and other important service contacts.