| 摘要 |
A threaded pipe connection (1) having box and pin members (20, 10) is provided with inner engageable thread means on the box and pin members (20, 10), the thread means including a helical dove-tail thread (22, 12) having negative flank angles extending along the lengths of the box and pin members (20, 10), and a helical intermediate thread (25, 15) having positive flank angles extending along the lengths of the box and pin members (20, 10) adjacent the dove-tail thread (22, 12). Upon makeup, the intermediate threads (25, 15) generate hoop tension in the box member (20) and hoop compression in the pin member (10), and the dove-tail threads generate hoop compression in the box member (20) and hoop tension in the pin member (10).
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