Joint assembly

A compound pipe arrangement comprising:

• a joint assembly for connecting a first pipe having a first inner diameter and a second pipe having a second inner diameter which is larger than the first inner diameter, the joint assembly including:
• an annular section comprising an annular wall defining a flow path through the annular section and configured to connect to the first pipe and to mate with the second pipe;
• and
• a clamp portion configured to clamp the second pipe between an outer surface of the annular section and an inner surface of the clamp portion;
• wherein
• an inner diameter of the annular section varies in a gradual manner from a first inner diameter at a first end of the annular section to a second inner diameter at a second end of the annular section;
• the first inner diameter of the annular section is substantially equal to the inner diameter of the first pipe;
• the second inner diameter of the annular section is substantially equal to the inner diameter of the second pipe;
• an inner surface of the annular section is tapered between the first end of the annular section and the second end of the annular section;
• the annular section is thicker at the first end of the annular section than at the second end of the annular section;
• wherein
• the joint assembly and the second pipe together comprise a ball joint formed by the outer surface of the annular section and an end portion of the second pipe;
• and
• wherein an outer surface of the annular section has a stepped arced profile, comprising a first arc having a first radius adjacent the first end and a second arc having a second radius adjacent the second end, with a transition portion therebetween, and wherein the difference between the radius of the first arc and the radius of the second arc is equal to a thickness of the second pipe.