Hydraulic ram pumps and Sling Pumps

develops because of high humidity and air temperature but low temperature of the water tank, thiscondensation can easily evaporate through gaps between the timber boards which allow ventilation.Another advantage of this layer of timber is that it is a relatively soft material and will act as a bufferbetween the hard concrete and the hard but very thin tank bottom. The timber must be treated.figure 4.3The interior of corrugated iron tanks should always be painted with special water tank paint. Thispaint, usually black, is produced on a bitumen basis. The manufacturer indicates that the paint doesnot affect drinking water. Since most of these types of paints develop toxic fumes, painting insidethe tank can only be done with breathing masks, but these are often not available. Another methodis to pour paint into the horizontal tank through the inspection hole and to spread it by rolling the tankcarefully. This protection paint reduces the corrosion of the metal from the inside and, by doing so,extends the life of the tank. The paint should also be used for the outside bottom of the tank andespecially the soldered joints between bottom and corrugated tank wall covering, as well as twocorrugations, before the tank is put up.Every corrugated iron tank must be fixed in position with steel ropes or heavy 16-gauge fence wire.The larger the tank the greater the risk of storm damage if the tank is empty and not tied down tothe plinth (see Fig. 4.4). A tank supplied by two gutters is shown in Fig. 4.5.figure 4.4 figure 4.5If a corrugated iron tank is used not only for rainwater but also for raw water from boreholes or wells,28