| 摘要 |
An offshore riser is made up of riser segments connected together. Each riser segment has a central pipe with a box on one end and a pin on the other end. The pin has two grooved profiles extending circumferentially around it. The box has a first tier of connectors mounted to and spaced circumferentially around the box. The box also has a second tier of connectors mounted to and spaced circumferentially around the box, but at a different elevation. The first and second tier connectors alternate with each other. Each of the connectors includes a dog and a screw for moving the dog into engagement with one of the profiles when the screw is rotated.
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