公开(公告)号：US20200011467A1

公开(公告)日：2020-01-09

申请号：US16485905

申请日：2018-02-19

Applicant: National Oilwell Varco Denmark I/S

Inventor： Thorsten Holst ,  Tom Larsen ,  Anders Straarup

IPC: F16L53/37 ,  F16L11/08 ,  F16L33/01 ,  F16L33/28

Abstract: An assembly comprising an end-fitting and an unbonded flexible pipe comprising several layers. The unbonded flexible pipe has an end-part entering the end-fitting at the front end and the layers of the unbonded flexible pipe being terminated in the end-fitting. The unbonded flexible pipe further comprises a first electrically conductive layer and a second electrically conductive layer, where the first electrically conductive layer is electrically insulated from the second electrically conductive layer. The end-fitting comprises a first electric zone electrically connected with the first electrically conductive layer, and a second electric zone electrically connected with the second electrically conductive layer, the first electric zone is electrically separated from the second electric zone, and the end-fitting comprises a third electric zone, the third electric zone being electrically separated from first electric zone and the second electric zone.

公开(公告)号：US20170299092A1

公开(公告)日：2017-10-19

申请号：US15516695

申请日：2015-10-14

Applicant: National Oilwell Varco Denmark I/S

Inventor： Tom Larsen ,  Thorsten Holst

IPC: F16L11/04 ,  F16L25/01 ,  B23P19/04 ,  F16L11/12 ,  F16L53/00 ,  F16L33/01

CPC classification number: F16L53/38 ,  B23P19/047 ,  F16L11/04 ,  F16L11/12 ,  F16L25/01 ,  F16L33/01 ,  F16L53/34

Abstract: The present invention relates to an assembly including an end-fitting and an unbonded flexible pipe, which end-fitting is adapted for connecting the unbonded flexible pipe to a connector. The end-fitting has a through-going opening with a centerline and a front end and a rear end, and the end-fitting further includes means for establishing an electrical connection to a least one electrical heating system in the unbonded flexible pipe. Moreover, the end-fitting includes at least one first metallic part having a first surface contacting a second surface of at least one second part in the end-fitting, wherein the first surface of the first metallic part, at least in the vicinity of the through-going opening, includes a coating having a high electrically resistivity. The invention also relates to a method for providing an end-fitting having good properties in respect of reducing galvanic corrosion.

公开(公告)号：US10655772B2

公开(公告)日：2020-05-19

申请号：US15516695

申请日：2015-10-14

Applicant: National Oilwell Varco Denmark I/S

Inventor： Tom Larsen ,  Thorsten Holst

IPC: F16L53/00 ,  F16L53/38 ,  F16L25/01 ,  F16L33/01 ,  F16L53/34 ,  B23P19/04 ,  F16L11/04 ,  F16L11/12

Abstract: The present invention relates to an assembly including an end-fitting and an unbonded flexible pipe, which end-fitting is adapted for connecting the unbonded flexible pipe to a connector. The end-fitting has a through-going opening with a centerline and a front end and a rear end, and the end-fitting further provides for establishing an electrical connection to a least one electrical heating system in the unbonded flexible pipe. Moreover, the end-fitting includes at least one first metallic part having a first surface contacting a second surface of at least one second part in the end-fitting, wherein the first surface of the first metallic part, at least in the vicinity of the through-going opening, includes a coating having a high electrically resistivity. The invention also relates to a method for providing an end-fitting having good properties in respect of reducing galvanic corrosion.

公开(公告)号：US10544892B2

公开(公告)日：2020-01-28

申请号：US15751288

申请日：2016-08-05

Applicant: National Oilwell Varco Denmark I/S

Inventor： Thorsten Holst ,  Anders Straarup ,  Tom Larsen

IPC: F16L33/01 ,  F16L11/127 ,  F16L11/08 ,  F16L53/34

Abstract: The present invention relates to an assembly comprising an end-fitting and an unbonded flexible pipe having a length and a longitudinal axis, said flexible pipe comprising, from the inside and out, an internal armour layer, an internal pressure sheath, at least one external armour layer and an outer sheath, the first end of the unbonded flexible pipe being terminated in the end-fitting, and the end-fitting comprising means for connecting the internal armour layer to an external electrical power source. The means comprise connection points to the internal armour layer in the unbonded flexible pipe and connection points to the electrical power source wherein the connection points for the electrical power source are mounted in a housing adapted to an outer surface-part of the end-fitting.

公开(公告)号：US20180231163A1

公开(公告)日：2018-08-16

申请号：US15751288

申请日：2016-08-05

Applicant: National Oilwell Varco Denmark I/S

Inventor： Thorsten Holst ,  Anders Straarup ,  Tom Larsen

IPC: F16L33/01 ,  F16L53/34 ,  F16L11/127 ,  F16L11/08

CPC classification number: F16L33/01 ,  F16L11/081 ,  F16L11/127 ,  F16L25/01 ,  F16L53/34

Abstract: The present invention relates to an assembly comprising an end-fitting and an unbonded flexible pipe having a length and a longitudinal axis, said flexible pipe comprising, from the inside and out, an internal armour layer, an internal pressure sheath, at least one external armour layer and an outer sheath, the first end of the unbonded flexible pipe being terminated in the end-fitting, and the end-fitting comprising means for connecting the internal armour layer to an external electrical power source. The means comprise connection points to the internal armour layer in the unbonded flexible pipe and connection points to the electrical power source wherein the connection points for the electrical power source are mounted in a housing adapted to an outer surface-part of the end-fitting.