Device for coupling two pipes of a run of piping comprising a set of frustoconical flanges, and piping comprising the coupling device

A coupling device intended for coupling first and second pipes of a run of piping, the coupling device comprising:

• a first part, configured to be coupled to the first pipe, as well as a second part configured to be coupled to the second pipe,
• the first part comprising a first flange which widens in the direction of the second part in operation and which has a first contact surface, the first flange comprising a first free end and a second end configured to be coupled to the first pipe,
• the second part comprising a second contact surface, which widens in a same direction as the first contact surface, configured to collaborate with the first contact surface, the second part comprising a second flange, the second flange comprising the second contact surface, the second flange comprising a free first end and a second end connected to a third flange,
• the coupling device comprising at least one seal interposed between the first and second parts as well as at least one clamp to keep the first and second contact surfaces pressed against one another while allowing them to slip relative to one another,
• one of the first contact surface and the second contact surface including a housing configured to house the seal, the other of the first contact surface and the second contact surface completely covering the housing,
• wherein the clamp comprises at least one clamping jaw comprising a groove, configured to collaborate with the first and second parts, which has a cross section such that a concentric tightening of the clamp causes the first and second contact surfaces to be kept pressed against one another,
• wherein the at least one of the first contact surface and the second contact surface which includes the housing has a reduced thickness at the housing, and
• wherein the housing is positioned on the second contact surface, closer to the free first end of the second flange than to the second end,
• wherein a joining zone joining the second and third flanges has a cylindrical external surface, and
• wherein each clamping jaw comprises a central portion, connecting the first and second flanks, which has a cylindrical internal surface configured to bear against the external surface of the joining zone when the clamp is clamped tight in operation.