ADR code TU21
Provisions for the use of tanks (TU) per ADR 2025.
The substance shall be protected by a protective agent in the following ways: Protective agent A layer of water in the tank Degree of filling of the substance (including water if any) at a temperature of 60° C shall not exceed Additional requirements for carriage at low ambient temperatures Nitrogena – 96 % – Water and nitrogena – 98 % The water shall contain sufficient antifreeze agent to prevent it from freezing. The antifreeze agent shall be free from corrosive action and not liable to react with the substance. Water not less than 12 cm 98 % a The remaining space of the tank shall be filled with nitrogen in such a way that, even after cooling, the pressure at no time falls below atmospheric pressure. The tank shall be closed in such a way that no leakage of gas occurs.