HERMETIC TUBE-ENVELOPE (VERSIONS) Russian patent published in 2002 - IPC

FIELD: piping systems; tubular articles made from composite materials, for example, multi-layer tubes-envelopes made from glass plastic where reinforcing fibers are embedded in polymer matrix. SUBSTANCE: hermetic tube-envelope includes load-bearing glass plastic layers with intermediate sealing layer in between them. Fastening circular closed layer made from material possessing anti-adhesion properties may be placed between intermediate sealing layer and inner load-bearing glass plastic layer and/or outer load-bearing glass plastic layer. Radial holes may be made in inner load-bearing glass plastic layer. Load-bearing glass plastic layers are made on base of glass cloth or vitreous fibers and polymer binder at mass ratio of 1:0.33 to 1:0.4. EFFECT: enhanced tightness and reliability. 12 cl, 8 dwg