Abstract: The invention pertains to a tank formed by a partially cylindrical body extended by a cylindrical part of smaller section by the intermediary of a tapering junction section, with a reinforcement ring located at the junction between at least one of the cylindrical parts and the tapering part, the ring having a machined interior surface to correspond over half of its width with the form of the exterior surface of the end of the cylindrical part and over the other half of its width with the form of the exterior surface of the end of the tapering part.

Abstract: The invention pertains to a tank having a partially cylindrical body extended by a cylindrical extension of smaller section by the intermediary of a tapered junction extension, and at least one internal reinforcement ring integral with the internal surface of the tubular part of smaller section.