cold water storage tanks

Cold water storage tanks or sometimes called cold water supply tanks were at one time made of galvanized iron, a material that eventually corroded. Modern tanks are of either glass fibre or plastic. The plastic type is flexible, so can be squashed to go through a narrow loft opening, but may well need support under the entire base. Glass fibre tanks are rigid. Your local water authority will have rules about the size of the cold water storage tanks, which it will express as something like 40/50. The latter figure (5O gallons/227 litres) is the amount the tank will hold when full to the brim; the former (40 ga1lons/ 181 litres) its capacity in practice. When a cold water storage tanks is being replaced the house will be deprived of water for some time. So do as much of the preparatory work as you can beforehand. Begin by shutting off the rising main, and opening cold taps to empty the tank. The draw-off points are in the side, rather than the base of the tank, so some water will be left behind. Beware later of spilling any of this. The tank needs to be disconnected from its various pipes. Do not bother trying to free corroded nuts to do this. The pipe runs will probably need modifying anyway, so just saw through them near the tank, making sure your cuts are Square. Do not worry either. If the Cold water tank is too big to come out through the loft opening. Just leave it up there.

cold water storage tanksNo holes are bored in the side of the tank when it is delivered the manufacturer could not possibly know where you want them. You have to make them yourself, with a hole saw in either a hand drill or an electric drill. So decide on a site for the tank (remembering that if you want a shower it might be wise to site the tank on a stout platform as high as possible to increase the pressure of Water at the rose). Plot the pipe rims and determine the position of the holes in the tank. The pipes are linked to the cold tank by pipe connectors. These have a threaded sleeve with a back plate. Push the sleeve through the hole from inside the tank with a washer on each side, then tighten the fixing nut. The supply pipes are fixed to this connector with a compression joint. You will need a cold supply from the rising main, a cold feed to the cold outlets, perhaps a special cold feed to a shower and an overflow. Also the vent pipe from the hot cylinder must bend over the top of the tank. Modify existing runs and add new ones as needed and connect them to the cold water storage tanks. A ball valve will be needed to control the entry of water from the rising main. Your local water authority may have regulations about the position of the various pipes. A rule of thumb however is that the ball valve inlet should be 55 mm from the top of the tank; the overflow should be 25mm below that (so that water from the tank cannot be sucked back into the main); and the various feeds to the supply should be 50 mm (2 inches) from the bottom of the tank Finally, having connected up all the pipe work, restore the supply and check for leaks. Cold water storage tanks are certainly useful and it is not difficult to fit one into your house yourself.

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