The Standard specifies the requirements for shop fabricated cylindrical, horizontal tanks, single and double skin for underground storage of water polluting liquids (both flammable and non-flammable). The standard is applicable for normal operating conditions (-20°C to +50°C). Where temperatures can fall below this range, additional requirements shall be taken into account. Quittance on liquid material combinations is given in annex B. The standard is not applicable for liquids causing special danger. The standard does not deal with internal coating.