Improvement of Gas-Tightness of OTTG and TBO-5 Threaded Pipe Couplings

摘要

Full contact is achieved between the OTTG and TBO threads at the inside thrust faces during the production of high-strength upset pipes at the Taganrog Iron- and Steelworks. This established the desired casing tightness of the couplings and ensured that the surface of the inside channel formed by a string of tubes is gap-free. A high gas-tightness at a working pressure of 80 to 100 MPa (800 to 1000 atm) is produced for tubes in the M and R strength groups. (ERA citation 10:026804)