Polyethylene upright storage tanks
NCh 3655:2019 Estanques de almacenamiento verticales de polietileno (Chilean Standard No. 3655:2019, Polyethylene upright storage tanks) (18 pages, in Spanish)
The notified standard sets out requirements concerning the materials used in, and the properties, design, construction, dimensions, tolerances, performance, quality and marking of, polyethylene upright storage tanks with a capacity of 200 litres or more. It applies to cylindrical, upright, flat-bottom tanks, constructed uniformly and in one piece from polyethylene by rotational moulding, for installation on flat surfaces. The standard applies to the storage of water intended for human consumption, in the conditions specified therein. It also applies to the storage of other liquids compatible with polyethylene, for industrial use or irrigation, and to the storage of foodstuffs and chemical solutions, at atmospheric pressure and at temperatures of up to 50°C.