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WEFTEC®.06 Available Water Pressure - System water supplies are determined by the source water pressure. Systems with less than 40 psi water pressure require booster pumps. Dosing Point Pressure Requirements - Systems having high dose point pressure requirements require independent dosing pumps. The dosing tank serves as a positive suction head pump supply and will usually require air fans to dilute the byproduct hydrogen. Dosage Control Methods - Pump configurations for dosing systems most often used are: a single pump in continuous dose operation, a single pump in shock dose operation, and a single pump for continuous operation using a second ‘continuous’ operation capable pump for shock dosing purposes. In all cases, regardless of the site, each pump in operation has a second pump in position to support failure occurrences. Power Supply Requirements - Three-phase supply power varies from more common 380, 415, and 460 volts to 4,160, 6,600, and 11,000 volts available. Systems having large DC power units will frequently use 4,160 or greater voltage for large onshore plants. Designers often prefer to use high voltage power, when available, to allow the use of smaller sized cabling resulting from lower AC operating line currents and existing high voltage switch gear. Depending upon the plant power distribution system, control voltage power is stepped down from the higher source power by a transformer to 110 or 220 volts from the main power supply line. Power also may be supplied separately from an independent source. Residual Control - Automated control is normally achieved by using a chlorine residual analyzer. This instrument sends an analog 4-20 mA signal to a controller or the PLC control system with a control scheme that in turn provides an analog signal to the DC rectifier for current control. The control loop is essential to prevent the DC rectifier current oscillation caused by control sensitivity. Operation and Maintenance of On-Site Sodium Hypochlorite Generation Systems This section provides the reader with practical electrochlorination system installation, operation, and maintenance requirements. These requirements are for reference only and in no way are intended to usurp supplier recommendations. Please note, No consideration is given in this discussion to civil installation requirements. The lists below are general requirements to install an on-site hypochlorite generation system, provide estimates of equipment and manpower, and the approximate time to install the system size noted. One will then have a reasonable order of magnitude to judge the requirements for larger or smaller system installation requirements. Mechanical and electrical installation requirements, hydraulic pressure testing, and commissioning time requirements for either a system of 1200 pounds chlorine equivalent per day are shown in Tables 1, 2, and 3, respectively. Copyright ©2006 Water Environment Foundation. All Rights Reserved 6351PDF Image | On-Site Sodium Hypochlorite Generation
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