FIELD: thrustless threaded joints of tubes of casing, pump-compressor and oil-gas pipelines.
SUBSTANCE: when cone outer thread is formed on tube provided with annular indicator for checking screwing-off, it is offered to extend screw surface of thread recess beyond boundary of indicator groove adjacent to thread and to arrange bottom of groove over surface of generating cone of thread recesses. Invention eliminates occurrence of disorder of threaded joint at assembling it and prevents lowering of threaded joint strength at tightening.
EFFECT: simplified technique for making indicating groove.
2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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|
RU2248494C2 |
