Sealing tubular connections
Perhaps the most efficient method for connecting tubes that require subsequent disconnection is helical threads. In fact, the Standardization Committee of the American Petroleum Inst. was formed to develop interchangeability standards for pipe connections between manufacturers. Oil Country Tubular Goods (OCTG) are intended to withstand high external loads, including fluids under pressure. Therefore, connections use seals that contain or exclude pressurized fluids. OCTG connections are essentially pressure vessels that comprise threads, seals, and stop shoulders. Low design factors and external and internal clearance are the unique application criteria. Seals for these connections take two general forms - those affected by the threads and those established separate from the threads. The tribological distinction is whether the seal is initiated by plugging the clearances manufactured between mating threads or by intimately fitting metal or plastic seals and seats together to form an interface. As an example, both conditions are found in 8-Round threads, where the root/crest clearances are manufactured leak passages and the flanks are intimately fitted metal seals.
- Research Organization:
- Thread Technology International
- OSTI ID:
- 6502941
- Journal Information:
- J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 37:7; ISSN JPTJA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Well pipe joint
Threaded pipe connection having wedge threads