The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 01, 2020
Filed:
Aug. 08, 2016
National Oilwell Varco Denmark I/s, Brondby, DK;
Anders Straarup, Valby, DK;
NATIONAL OILWELL VARCO DENMARK I/S, Brondby, DK;
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 made from an electrically conductive material, an internal pressure sheath made from an extruded polymer, at least one external armor layer and an outer sheath, in which the carcass is adapted for connection to an electric power source for conducting an electric current. Moreover, at least a part of the external armor layer is electrically conductive, the carcass and the external armor layer allowing a difference in electric potential to be established partly or fully over the internal pressure sheath, wherein the internal pressure sheath is partly or fully covered by a conforming cover layer made from a material which is electrically conductive and has a bulk resistance larger than the specific resistance of the electrically conductive material of the carcass.