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Underground water tanks need to have special features that will enhance their ability to withstand the conditions to which they will be exposed. This article discusses some of the features that you should pay attention to when buying an underground water storage tank.
Wall Thickness
The walls of underground water tanks tend to be thicker than the walls of above ground tanks. This is because the underground water tanks have to contend with the higher pressures exerted by the soil surrounding the tank. The tanks also have ribs/ridges to increase their ability to resist crushing under the pressure of the soil around them.
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Tank Shape
Shape plays a vital role in determining how strong an underground tank will be. Specific shapes, such as rectangular tanks, allow stress to concentrate in particular parts of the structure (the corners, for example). That concentration of stress eventually causes the tank to fail at those points. Tanks made in a cylindrical shape perform better in underground applications because that shape facilitates the equitable distribution of the stresses exerted on the tank.
Material Used
The material from which a water tank has been made also plays an important role in making it suitable for underground applications. For example, tanks made from polyethylene may be better for underground use because such tanks will not corrode or crack easily. Other types of tanks, such as metallic tanks, may require heavy maintenance to survive the difficult underground challenges.
The Manufacturing Process
Tanks intended for underground use should be made using techniques that minimise seams in the tanks. For example, the rotational moulding process allows the manufacturers of plastic water tanks to make seamless tanks that can last without developing leaks. Seams can be a point of weakness from which leaks can spring. Limiting those points of weakness can help to avoid structural problems in the tank.
Colour Suitability
The tank that you select for underground use should have an appropriate colour. For example, underground tanks normally have different colour codes in different jurisdictions to differentiate the tanks that serve different purposes. For instance, one colour may be designated for greywater while another colour is for potable water. Colour is also important since light should not penetrate the tank. Light encourages the growth of algae. Opaque colours block the entry of light through the parts of the tank that are exposed above ground.
You should, therefore, decide which application you wish to obtain a tank for so that you buy a tank that is designed for that particular task.
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