?Industrial storage tanks are used as containers for liquids, and at times compressed gases. In some countries, storage tanks operate with almost very little to no pressure. That makes them different from pressure vessels. Storage tanks are normally shaped like a cylinder, angled perpendicularly from the ground, and has flat bottoms with fixed floating roof. These reservoirs can be covered or may be placed underground. These are what we call underground storage tanks or reservoirs. Storage tanks are available in many shapes: vertical and horizontal cylindrical; open top and closed top; flat bottom, cone bottom, slope bottom and dish bottom. Large tanks tend to be vertical cylindrical, or to have rounded corners (transition from vertical side wall to bottom profile, to easier withstand hydraulic hydrostatically induced pressure of contained liquid. Most container tanks for handling liquids during transportation are designed to handle varying degrees of pressure. Building a bunding or containment dike around storage water tanks is a means to prevent leakage. This is considering most liquids do spill, evaporate or leak through even the smallest hole. Floating roofs are considered a safety requirement as well as a pollution prevention measure for many industries including petroleum refining. This floating roof rises and falls with the liquid level inside the tank, thereby decreasing the vapor space above the liquid level. Some storage tanks need a floating roof in addition to or in lieu of the fixed roof and structure. Formit poly tanks have the largest range on the East Coast of Australia, all built to match Australian standards. They are used to store virtually anything - from water, to food or chemicals. tank designs undergo Finite Element Analysis (FEA) to ensure optimum long term performance, and the finished product is tested using inhouse facilities that include ultrasonic thickness measurements and impact testing. It is recommended that quality hexane copolymer resin (a linear, low density polyethylene) designed specifically for industrial tank rotational moulding, and state-of-the-art, computer-controlled biaxil and rock and roll rotational moulding machines are to be used.