The tank carriage is used for transportation of liquefied hydrocarbons, as well as their mixtures and liquids with a density of not more than 0.731 t/m3. The tank boiler is designed for an operating pressure of 2.0 MPa (20 kgf/cm2) and has a cylindrical wall thickness of 20 mm and a bottom thickness of 22 mm. The manhole is 528 mm in diameter and located in the middle of the boiler.