FIELD: pipe.
SUBSTANCE: described is flexible pipe in coils with improved and variable properties along pipe length, which are produced by continuous dynamic heat treatment (CDHT). Flexible pipe is unwound from drum, is subjected to CDHT and again wound on drum. By means of CDHT process production of “composite” tubes can be performed so that selectively changing properties of pipe along its length. For example, properties of pipe can be selectively set along length specially for technological process, in which pipe will be used.
EFFECT: technical result is change of mechanical properties of sections of flexible pipe along its whole length.
23 cl, 6 dwg, 2 tbl, 4 ex
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