![]() ![]() Usually, these tanks are designed in such a way that they can be stacked or placed on top of a permanent base tank for easy gravity filling of the base tank.ĭrum Storage. Where chemical feed rates are not large enough to justify bulk delivery and storage, chemicals can be supplied in reusable shuttle tanks (Figure 35-4). They also provide a convenient way to measure daily product usage rates. Day tanks are used as a safeguard to prevent all of the material in the main storage tank from accidentally being emptied into the system. Treatment can be drawn from these storage vessels and injected directly into the water system or added to a smaller, secondary feed tank, which serves as a day tank. Service representatives often handle all inventory management functions. A large tank, often supplied by the water treatment company for storing the liquid treatment, is placed on the property of the user near the point of feed (Figure 35-3). ![]() Liquid treatments are delivered by vendor tank truck or common carrier. Large users often find it advantageous to handle their liquid chemical delivery and storage in bulk. The choice among these three depends on a number of factors, including usage rate, safety requirements, shipping regulations, available space, and inventory needs.īulk Storage. Treatment chemicals are usually delivered and stored in one of three ways: bulk, semibulk, and drums. The use of a proper feed system can prevent this situation.Ĭhemical feed systems can be classified according to the components used, the type of material to be fed (powder or liquid), the control scheme employed, and the application. When a chemical feed system is not properly engineered, chemical levels are often above or below program specifications. risk of severe and widespread damage to process equipment due to poor control or spillage of acid into cooling towersĪ significant investment in a chemical feed system can often be justified when compared with the high cost of these control problems.high labor costs due to an excessive requirement for operator attention. ![]() high corrosion rates and resultant equipment maintenance and replacement (i.e., plugging or replacing corroded heat exchanger tubes or bundles).inconsistent product quality, reduced throughput, and higher steam and electrical costs due to waterside fouling.high chemical costs due to overfeed problems.Some of the costly problems associated with poor chemical control include: If a feed system is not designed properly, chemical control will not meet specifications, program results may be inadequate, and operating costs will probably be excessive. A well engineered feed system is an integral part of an effective water treatment program. ![]()
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