Internal pipe clamp alignment guides with purge backup
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United States of America Patent
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Mar 20, 2012
Grant Date -
Dec 30, 2010
app pub date -
Sep 10, 2010
filing date -
Aug 27, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to an apparatus for clamping adjacent ends of pipe sections to be welded, the apparatus comprising a plurality of clamping members movable between retracted and extended clamping positions, each of the clamping members comprising a clamping shoe and a connecting member connecting the shoe to the apparatus frame; each of the clamping shoes comprising a longitudinal groove on its clamping surface oriented parallel to the adjacent pipe ends, at least one gas passageway through the clamping shoe which extends from a surface of the shoe away from the clamping surface to a termination point within the longitudinal groove, and at least one alignment guide device in the longitudinal groove; a means for delivering an inert purge gas to the longitudinal groove through the gas passageway; and a means for moving the clamping members between the retracted and extended clamping positions.
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