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专利名称：Pipe testing apparatus发明人：William C. Heldenbrand申请号：US06/508656申请日：19830628公开号：US045131A公开日：19850514
摘要：A machine is disclosed for applying lengthwise tension to a length of pipe, suchas a joint of pipe used in an oil well drill string, for example, for the purpose of testingthe pipe for tensile strength. The machine includes gripping assemblies for holdingopposite ends of the pipe in respective parts of the machine which are urged apart toapply tension to the pipe. Each gripping assembly includes a rotary mandrel which isthreaded onto a sub secured to the respective pipe end, and a header rotatablymounting the mandrel. The header includes a plate providing restraint for the mandrelprecluding its expulsion from the machine in the event of a pipe failure during theapplication of tension thereto. A rotary drive is provided for each mandrel for threadingthe mandrel onto and off the respective sub.
申请人：HELDENBRAND; WILLIAM C.
代理人：Harvey B. Jacobson
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