scope:

This standard specifies the requirements for metallic shop fabricated cylindrical, horizontal tanks, single and double skin for underground storage of water polluting liquids (both flammable and non-flammable) within the following limits: - from 800 mm up to 3000 mm nominal diameter and, - up to a maximum overall length of 6 times the nominal diameter and, - for liquids with a maximum density of up to 1,9 kg/l and, - with an operating pressure (Po) of maximum 1,5 bar (abs.) and, - where double skin tanks with a vacuum leak detection system are used the viscosity of the stored media shall not exceed 5 x 10³ m²/s. This standard is not applicable to the liquid classes listed in table 1 because of special dangers involved.