The standards for an unburied tank differ according to the volume of storage. In the case of a maximum capacity of 2,500 litres, the tank can be installed on the ground floor or in the basement on a masonry and flat floor. The part must be:
- Well ventilated
- Closed by a flameproof door (degree 1/4H).
In addition, walls and floors (top and bottom) must be 1/2H fireproof.
If the tank capacity exceeds 2,500 litres, the tank must be installed in a dedicated room. In this case, the flameproof door must be of degree 1H and open outwards. Another important point: a fresh air supply of at least 1dm² is required in the room.