THREADED CONNECTION FOR STEEL PIPE
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United States of America Patent
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Issued Date -
Jul 21, 2016
app pub date -
Sep 4, 2014
filing date -
Sep 6, 2013
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Abstract
A threaded connection for a steel pipe includes a box which is an opening end of a second pipe and a truncated cone shaped pin which is an end of a first pipe and is inserted into the box, wherein the pin includes a male thread portion which is a tapered thread and a seal portion which includes a tapered surface, the box includes a female thread portion which is a tapered thread and a seal portion which includes a tapered surface, and in a state before make-up between the pin and the box, a minimum diameter of the tapered surface of the pin is smaller than a maximum diameter of the tapered surface of the box.
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