A pipe includes at least one first section connected to a second section by a hinged element allowing a predetermined angular movement of the first section relative to the second section under a predetermined minimum force. The hinged element includes two end pieces connected respectively to the first section and to the second section and hinged with each other to allow the angular movement, and a tube having ends connected to the end pieces so as to be elastically deformable under the predetermined force according to the predetermined angular movement. The sections and the end pieces themselves are rigid under the predetermined minimum force. A treatment facility include such pipes.

A swivel pipe coupling includes two semi-spherical couplings that include mating surfaces slanted at each other. The mating surfaces include walls that extend from outside surfaces of the semi-spherical couplings. At least one of the semi-spherical couplings includes a pipe connection for receiving therein a pipe. The pipe connection includes an annular seal plus a grip ring that has wedge-shaped grip elements that are radially spaced from one another about a ring member. One or more tightening elements pass through clamp members of each pipe connection. The mating surfaces are provided with an elastomeric seal, one or more clamps and one or more tightening elements that pass through the clamps. Restraint members are located along the mating surfaces of the semi-spherical couplings, which resist forces which would tend to separate the semi-spherical couplings from each other.

An extendable and contractible flexible joint having a pair of flexible joint portions, which are bendable and fitted and connected to a connection sleeve, in a direction of a pipe axial line. An extending motion limiting portion includes a fluid chamber into which a portion of a pressure fluid in a flow path diverges and flows, and is configured to apply a fluid pressure applied to pressure receiving surfaces of the fluid chamber. An inner joint body of each of both the flexible joint portions is configured to be attachable and detachable to and from the connection sleeve, and an outer joint body and the inner joint body of each of both the flexible joint portions are configured to be attachable and detachable to and from each other.

A pipe includes at least one first section connected to a second section by a hinged element allowing a predetermined angular movement of the first section relative to the second section under a predetermined minimum force. The hinged element includes two end pieces connected respectively to the first section and to the second section and hinged with each other to allow the angular movement, and a tube having ends connected to the end pieces so as to be elastically deformable under the predetermined force according to the predetermined angular movement. The sections and the end pieces themselves are rigid under the predetermined minimum force. A treatment facility include such pipes.