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
| Title | Year | Author | Number |
|---|---|---|---|
| PIPE WITH INTERNAL PLASTIC ENVELOPE | 2000 |
|
RU2171945C1 |
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RU2686129C1 |
| PIPE WITH INTERNAL PLASTIC SHELL | 2015 |
|
RU2613547C1 |
