公开(公告)号：US20180231150A1

公开(公告)日：2018-08-16

申请号：US15751607

申请日：2016-08-08

Applicant: National Oilwell Varco Denmark I/S

Inventor： Kristian GLEJBØL ,  Anders STRAARUP

IPC: F16L11/08 ,  F16L53/37 ,  F16L53/38

CPC classification number: F16L11/083 ,  B32B1/08 ,  B32B2597/00 ,  F16L53/37 ,  F16L53/38 ,  F16L59/153 ,  H05B2214/03

Abstract: The present invention relates to an unbonded flexible pipe having a length and a longitudinal axis and comprising, from the inside and out, a carcass, an internal pressure sheath, at least one external amour layer, and an outer sheath, the carcass comprises at least one elongate armour element helically wound to surround the center axis with a winding degree to the longitudinal axis. The elongate armour element is electrically conductive and comprises at least a first section and a second section along the length of the pipe where the electrical resistance of the first section is different from the electrical resistance of the second section.