REINFORCED PIPE-ENVELOPE FOR OPERATION UNDER HIGH PRESSURE Russian patent published in 2000 - IPC

FIELD: pipes-envelopes made from composite materials. SUBSTANCE: reinforced pipe-envelope intended for working under high pressure includes body made from composite material and inner and outer protective coats. Outer protective coat is made from polymer binder integral with polymer binder of composite material of body in form of homogeneous continuous layer reinforced by outer layer over surface on side of body; outer layer consists of crossing helical spirals of taps of continuous fibers at volumetric ratio of continuous fibers and polymer binder in body from 1:0.5 to 1:0.75. EFFECT: enhanced uniformity of Load; avoidance of stress concentration, separation and break of outer protective layer. 3 cl, 3 dwg