Abstract: The invention concerns a tank or silo vessel (10), in particular a vehicle-mounted vessel designed to hold liquid or other free-flowing goods, the elongated main body (12a) of the vessel having an essentially circular or elliptical or other cross section. The main body is closed off at each end by walls (12) which are conical, hemispherical or planar in shape, the main body (12a) and endwalls (12) enclosing a space (11) in the interior of the vessel. The vessel also has mountings (13) and pipe-connection facilities (14).