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This standard specifies general principles for welded static non-pressurised thermoplastic tanks. It applies to work shop and site fabrications. The standard covers tanks with a capacity of 0,45 m3 (450 litres) and above. Tanks which comply with the requirements of this standard are not intended to withstand internal pressure or vacuum other than that which may occur during the transfer of fluids (including gases) in their normal operation. This standard applies to tanks fabricated in the following thermoplastics: Polyethylene (PE) Polypropylene (PP) Poly (vinyl chloride) (PVC) Poly (vinylidene fluoride) (PVDF) NOTE: Design data for these materials is given in EN 1778.