| 摘要 |
FIELD: rigid pipes. ^ SUBSTANCE: pipe has bushings concentrically mounted at the pipe ends. The bushings are made of a metal, the concentration of carbon in which exceeds the carbon concentration in the metal of the pipe. The bushing surface, which is in a contact with the inner plastic shell, is provided with threaded bores. ^ EFFECT: enhanced reliability. ^ 1 cl, 1 dwg |
