F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
285/63
F16L 15/00 (2006.01) E21B 17/08 (2006.01) F16L 15/06 (2006.01) E21B 17/042 (2006.01)
Patent
CA 1165791
ABSTRACT OF THE DISCLOSURE: A threaded joint with high gas-leak-tightness for oil and gas well pipe comprises a box having an internal female thread and a pin having an external male thread, the box and pin being screwed together in use. The external male thread on the pin starts from the pin end as a rounded triangular thread and follows into a buttress thread and the internal female thread is formed in a corresponding manner, thus forming a composite thread in a single thread train in each of the box and the pin, whereby a threaded joint with perfect sealing an excellent repeat make-up performance is obtained.
375211
Akase Sigeyuki
Kohyama Fuzimasa
Maruyama Kazushi
Tanabe Masayoshi
Nippon Steel Corporation
Robic Robic & Associes/associates
LandOfFree
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