Helically wound metal pipe with sealing arrangement
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United States of America Patent
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Jun 16, 2015
Grant Date -
Sep 19, 2013
app pub date -
Mar 13, 2012
filing date -
Mar 13, 2012
priority date (Note) -
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Abstract
A pipe includes a tubular pipe formed of a metal sheet that is spirally wound such that opposite edges of the metal sheet are joined by a crimped lock seam that extends helically along a length of the tubular pipe. A sealing arrangement includes a helically extending worked surface band extending along the crimped lock seam and to both sides of the crimped lock seam, the worked surface band having a surface roughness that is greater than a surface roughness of unworked surface portions outside of the worked surface band. A helically extending external coating band is applied over the crimped lock seam and bonded to the worked surface band.
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