Patent ID: 11892106
Assignee: VALLOUREC OIL AND GAS FRANCE
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  E | IPC E  F

Claim 1:
2. The threaded connection for steel pipe according to claim 1, wherein the pin further includes:
a nose provided at the tip of the pin;
a pin inner sealing surface located between the nose and the inner male thread; and
a pin intermediate sealing surface provided between the outer male thread and the pin intermediate shoulder surface, and
the box further includes:
a box inner sealing surface facing the pin inner sealing surface, the box inner sealing surface being in contact with the pin inner sealing surface when the pin and the box are made up; and
a box intermediate sealing surface facing the pin intermediate sealing surface, the box intermediate sealing surface being in contact with the pin intermediate sealing surface when the pin and the box are made up.