FLEXIBLE HOLLOW PIPELINE INCLUDING HOLLOW SEALED ENVELOPE OF CROSS LINKED POLYETHYLENE AND DEVICE METHOD OF MAKING THE SAME Russian patent published in 1997 - IPC

FIELD: flexible hollow pipelines designed for oil fields under sea bottom and method of making such pipelines. SUBSTANCE: pipeline includes at least one reinforcing layer arranged around hollow sealed envelope. Said hollow sealed envelope contains homopolymer and (or) copolymer of ethylene and graft silane cross linked by hydrolysis at cross linkage degree more than 60%, preferably more than 70%. Method of making such pipeline comprises steps of filling flexible hollow pipeline by water containing liquid and heating hollow envelope for accelerating cross-linking process. EFFECT: enhanced quality of pipeline, improved design, enhanced efficiency of fabricating it. 14 cl, 7 dwg