| 摘要 |
An improved internal line up clamp (10) is disclosed which has an integral back up ring (12). A first set of pipe clamps (22) move radially outward to engage the inner surface of a first pipe (14). A second set of pipe clamps (62) and a set of back up ring segments (88) are simultaneously moved radially outward into engagement with the inner surface of the pipes. The back up ring segments (88) are spring loaded to exert a relatively constant back up force against the inner surface of the pipes at the weld. In a modification, a fill block (118) can be used to fill the gap between adjacent back up ring segments when engaging the inner surface of the pipe.
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