Model of a spherical tank in N scale. This tank holds about 137m³, or 65 tonnes, of LPG, LNG, Butane, Propane or any other liquified (pressurized) gas. This tank is 40mm in diameter and 46mm tall. This model includes a tank with walkways and a 2-storey industrial staircase.
Spherical tanks (officially Horton Spheres
) are used because the round shape has the lowest possible surface area to volume ratio and because this shape will distribute the stresses evenly. A cilindrical tank holding an equal amount of pressurized gas will need about double the amount of steel of a spherical tank.