The use of turbo vibrocompressed concrete pipes with an ovoidal section is particularly recommended for mixed sewage systems. Thanks to the hydraulic feature of the ovoidal pipe, also in dry weather conditions wastewaters flow and this is made easier by the small section. The quality of the concretes is guaranteed by the constant controls carried out in our laboratories on the granulometry of the inert materials, on the quality of the mixtures and on their resistance to compression and traction at 3, 7 and 28 days after the casting. ILCEV ovoidal pipes are built in compliance with the EN 1916 regulation.