BIPLASTIC PIPE Russian patent published in 2005 - IPC

FIELD: plastic pipes.

SUBSTANCE: in proposed biplastic pipe with inner layer made of thermoplast, outer layer of glass plastic and stiffening ribs secured on outer surface of inner layer, height of stiffening ribs h is determined by formula h>Δα·Δt·d_in, where Δα is different of coefficients of linear thermal expansion of materials of inner and outer layers; Δt is difference in maximum and minimum temperatures of transferred medium; d_in is outer diameter of inner layer.

EFFECT: improved strength and operation reliability of biplastic pipe.

3 cl, 3 dwg