CPC F16L 55/1653 (2013.01) [B29C 63/0052 (2013.01); B29C 63/341 (2013.01); B29C 63/346 (2013.01); F16L 55/1656 (2013.01); G01M 3/2815 (2013.01)] | 16 Claims |
1. A liner for lining a potable water conduit, the liner comprising one of: thermoplastic polyurethane, polyethylene and other polyolefines, polyamide, and blends thereof, and PVC or CPVC and having a structure comprising:
an outer fabric layer impregnated with a resin;
a middle fabric layer impregnated with a resin, surface asperities and depressions of the outer fabric layer and of the middle fabric layer respectively interpenetrating; and
an inner membrane layer having an inner surface of the liner and being impermeable to the potable water;
the outer fabric layer and the middle fabric layer comprising fibers or assemblies of fibers in the form of rovings or yarns, with levels of twisting selected according to target density, yarns tenacity and handability, in at least one of: nylon, polyester, glass fiber, carbon fiber, aramid, linen, and canvas, and comprising at least one of: a plain weave, a satin weave, a basket weave, a twill weave, and a non-crimp structure; and:
a flexural modulus of elasticity of at least 1500 MPa, or of at least 1724 MPa, or of at least 2000 MPa;
a flexural strength of at least 31 MPa, or of at least 60 MPa, or of at least 100 MPa;
a tensile strength of at least 21 MPa, or of at least 50 MPa, or of at least 90 MPa;
a longitudinal deformation at break of at least 10%, or at least 15%, or at least 20%; and
a circumferential deformation at break of at least 5%, or at least 10%, or at least 15%;
the liner being formable into a structural tubular body with a cross-section being one of: polygonal; partly straight and partly curved, comprising folded sections.
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