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WEFTEC®.06 Teflon, Viton, titanium, Hastelloy ‘C’, and ceramic are the construction materials of choice for pumps. Money on these materials will serve as an insurance policy to assure reliable system operation. Local Regulations and Codes - Electrical codes can be particularly onerous when care is not taken in the review process. Generally, local regulations regarding the generation of hydrogen gas are not an issue since the generated hydrogen is diluted to less than 2% of the lower explosive limit. Safety interlocks are also included in the system to ensure the system can not be operated with flow through the cell. Site Type - Site location and environmental conditions may control the approach taken to provide reliable equipment. As well, locations will most assuredly have very high densities of dust and dirt during dry conditions. With a few exceptions, large systems, over 1,000 pounds per day (450 kilograms per day) are installed indoors and protected from the sun. Local Environmental Conditions - Ambient air temperature and humidity should characterize material designs for the DC power supply and the control panel; the cooling method and media are important considerations to insure reliable operation. Equipment exposure to temperatures well below zero is not likely without proper freeze protection. On the other hand high temperatures will damage equipment if cooling methods such as shading and air conditioning are not employed. Water temperatures are important to consider in sodium hypochlorite systems because the anode coatings are sensitive to temperatures below 60oF (15oC). In cold water, the electrode coating is affected by the increased oxygen concentration in the water. This increased oxygen concentration results in increased oxygen generation by the anode. To overcome this problem, several methods may be employed (e.g., reduction in the operating current density and changes to the electrode coating) to allow the use of higher oxygen concentrations in the water. Pipe, valves and fittings must be designed for severe sun exposure (UV rays) and ozone conditions in rare occasions. PVC pipe will usually surface harden under these conditions and result in embrittlement, normally not a problem unless the pipe receives a severe impact. The affects of both UV and ozone on PVC pipe may be controlled by painting the pipe. Nearly any latex paint, preferably a light color, will serve to block UV and ozone effectively. With weather exposure FRP pipe surfaces may expose glass fibers. Painting FRP pipe may also solve these problems. However, specific painting steps may be necessary for effective painting. These steps may include the use of specific wash coat primers to ensure good paint adhesion. FRP tanks should have a white gel coat as provided by the tank manufacturer to prevent gradual surface degradation when used for brine or hypochlorite storage. Steel fabrications should always be seal welded to eliminate crevice corrosion problems. The long-term corrosion control benefits may justify the minor added cost of seal welding. Painting fabricated steel requires coatings having at least a three-part system. This system provides a zinc base coat to provide severe duty protection. Properly prepared and painted steel will withstand very harsh salt environments and random hypochlorite exposure. Copyright ©2006 Water Environment Foundation. All Rights Reserved 6350PDF Image | On-Site Sodium Hypochlorite Generation
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