Patent ID: 9062804
Filing Date: 2015-06-23
Classification: F16L

Abstract:
1. A threaded pipe connection, comprising: a coupling having a torque shoulder and two female threads; and a pipe having a male thread; wherein: said two female threads are symmetrically disposed on both ends of the coupling; said torque shoulder is disposed on the coupling and between said two female threads; said male thread is disposed at an end of the pipe; each said female thread comprises a buttress thread; said buttress thread comprises a plurality of teeth; one of a fourth to seventh tooth of said plurality of teeth as counted from said torque shoulder is a protruding threaded segment; said plurality of teeth comprises said protruding threaded segment and a remaining plurality of teeth; each of said remaining plurality of teeth comprises a first load flank, a first tooth crest, a first stabbing flank, and a first tooth root; said protruding threaded segment comprises a second load flank, a second tooth crest, a second stabbing flank, and a second tooth root; said first tooth roots are disposed along a tooth root baseline; said first tooth crests are disposed along a tooth crest baseline; said second tooth root protrudes from said tooth root baseline and toward said tooth crest baseline; said second tooth crest protrudes from said tooth crest baseline and away from said tooth root baseline; and one of said two female threads engages said male thread, and said protruding threaded segment forms an interference fit with said male thread along said second load flank, said second tooth crest, said second stabbing flank, and said second tooth root; whereby forming a seal along said second load flank, said second tooth crest, said second stabbing flank, and said second tooth root to prevent high pressure gas from leaking.