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WEFTEC®.06 Hydrogen dilution fans are considered part of all systems, yet their importance is defined by the system location and local conditions. For example, many systems are designed without fans because they are located away from ignition sources. Other systems use open top tanks to allow the hydrogen to separate and disperse. On-site generation systems typically have closed tanks; therefore fans are required (as shown in Figure 4) for normal dilution, although some tanks may be directly vented. Figure 4 Typical Sodium Hypochlorite Storage Tanks with Hydrogen Dilution Fans Although pumps typically require very little maintenance, they are essential to effective system performance. Whether they supply water to the system or product to the dosing point routine maintenance is required to assure system reliability. On-Site sodium hypochlorite systems will normally have only product dosing pumps. Generally, they are positive displacement pumps to overcome system dosing point pressures. Variable speed drive controls are common to assure correct product addition. Some systems may require a centrifugal pump on the inlet water supply to boost the pressure due to low resident system pressure. These pumps interface with the control scheme for operation whenever the system is in operation. Instrumentation - System instruments are designed to provide continuous system monitoring for conditions outside acceptable operating limits. They also form an essential part of the control and safety logic. All electrolysis systems are designed to have water and brine flow indication, cell level sensors, cell temperature sensors, tank level indication, hydrogen fan indication, and dosing point residual indication. All of these sensors can, depending in the vendor’s control logic design, have alarm and shut down set points. Systems from all vendors will have the same general alarm and status indicators to confirm proper operation. With few exceptions, each of these alarm situations will Copyright ©2006 Water Environment Foundation. All Rights Reserved 6340PDF Image | On-Site Sodium Hypochlorite Generation
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