Patent ID: 6048428
Filing Date: 2000-04-11
Classification: F16L,Y10S,Y10T

Abstract:
A method of making a composite pipe having inner and outer linings of fiber reinforced plastics material, the inner and outer linings having therebetween a core of at least one layer of helically wound steel strip, said steel strip being embedded within a resin material matrix; wherein the method comprises the steps of:providing a rotatable mandrel on which to form said composite pipe;forming said inner lining by helically winding a plurality of layers of continuous filament fiber material onto said mandrel, the continuous filament fiber comprising each of said layers being wound at a predetermined angle to an axis of said pipe and all running in a helical direction,providing a resin material matrix for said plurality of layers of continuous filament fiber material forming said inner lining;helically winding at least one layer of steel strip onto said inner lining to form said core and providing said core with a resin material matrix;forming the outer lining by helically winding a plurality of layers of continuous filament fiber material onto said core, the continuous filament fibers comprising each of said layers being wound at a predetermined angle to said pipe axis and all running in a helical direction;providing a resin material matrix for said plurality of layers of continuous filament fiber material forming said outer lining;at least partially curing said resin matrix; and,removing said composite pipe from said mandrel.