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Coca-Cola Enterprises - West <br /> U5TEC job No. 90054 03 <br /> 5.4.5 Inlet and Outlet Plenums <br /> The inlet and outlet plenums are designed to provide the most efficient flow distribution into <br /> and out of the porous bed and are constructed of externally stiffened carbon steel sheets The <br /> plenum walls are internally insulated <br /> 5.4.6 Bed Casing Insulation <br /> The bed casing is internally insulated with 8 to 12 inches of compressed fiber which is <br /> temperature rated at 2,600° Fahrenheit The insulation is located between the bed material and <br /> ' the casing wall to assure that the insulation cannot be displaced, causing hot spots <br /> ' S 4.7 Casing Access Openings <br /> The top surface of the upper plenum is constructed so that access to the heat transfer media is <br /> ' available <br /> 5.4 8 In-Bed Heating Elements <br /> In-bed heating elements are located near the center of the bed for total coverage and require a <br /> ?30 volt, three-phase, 60 hertz power supply The elements are made from a high temperature <br /> ' alloy which can withstand wide temperatures of up to 2,550° Fahrenheit. When heated, the <br /> resistance heating elements form a self-protective oxide laver on their surface <br /> 1 <br /> 5.4.9 Process Flow Control Valves <br />' The unit contains four pneumatically actuated control valves which are used to reverse the <br /> direction of flow of the process stream through the combustion bed <br /> 5.4.10 Svstem Controls and Instrumentation <br />' A control panel is included for the unattended,automatic operation of the unit The panel meets <br /> all electrical codes and is capable of shutting down the system in the event of the following <br /> conditions <br /> 0 Bed temperature below 1,800°Fahrenheit <br />