公开(公告)号：BR0106539A

公开(公告)日：2002-10-08

申请号：BR0106539

申请日：2001-12-31

Applicant: NEXANS

Inventor： MJELSTAD EINAR ,  IVERSEN OYVIND ,  CLASEN TORUNN LUND

IPC: F16L53/00 ,  F24H1/10 ,  H05B3/40 ,  E21B17/00 ,  F16L11/22

Abstract: The present invention relates to an offshore installation including an oil/gas flowline umbilical installed between a platform-or a shore installation-and a sea bed based template and including an insulated electrical cable conductor connected in series with the steel oil/gas pipe to a power supply. The main features of the invention is that the far end interconnection between the cable conductor (or parallel cable conductors) and the pipe is grounded to seawater to provide a single point grounded system, such that all the current flows in the selected cable conductors, and the system has zero volts at the far end whereby no current is transmitted though the sea. The power supply is insulated from ground and the current is fed from the power supply through the pipe, and returns through the cable, whereby a voltage level of zero Volts is obtained at the far end where the system is grounded, and all the current is forced through the cable(s) and the pipe/flowline.

公开(公告)号：NO321868B1

公开(公告)日：2006-07-17

申请号：NO20006704

申请日：2000-12-29

Applicant: NEXANS

Inventor： MJELSTAD EINAR ,  CLASEN TORUNN LUND ,  IVERSEN OYVIND

IPC: F16L53/00 ,  F24H1/10 ,  H05B3/40

Abstract: The present invention relates to an offshore installation including an oil/gas flowline umbilical installed between a platform-or a shore installation-and a sea bed based template and including an insulated electrical cable conductor connected in series with the steel oil/gas pipe to a power supply. The main features of the invention is that the far end interconnection between the cable conductor (or parallel cable conductors) and the pipe is grounded to seawater to provide a single point grounded system, such that all the current flows in the selected cable conductors, and the system has zero volts at the far end whereby no current is transmitted though the sea. The power supply is insulated from ground and the current is fed from the power supply through the pipe, and returns through the cable, whereby a voltage level of zero Volts is obtained at the far end where the system is grounded, and all the current is forced through the cable(s) and the pipe/flowline.

公开(公告)号：GB2373321B

公开(公告)日：2003-02-26

申请号：GB0130939

申请日：2001-12-24

Applicant: NEXANS

Inventor： MJELSTAD EINAR ,  IVERSEN OYVIND ,  CLASEN TORUNN LUND

IPC: F16L53/00 ,  F24H1/10 ,  H05B3/40 ,  E21B43/01

Abstract: The present invention relates to an offshore installation including an oil/gas flowline umbilical installed between a platform-or a shore installation-and a sea bed based template and including an insulated electrical cable conductor connected in series with the steel oil/gas pipe to a power supply. The main features of the invention is that the far end interconnection between the cable conductor (or parallel cable conductors) and the pipe is grounded to seawater to provide a single point grounded system, such that all the current flows in the selected cable conductors, and the system has zero volts at the far end whereby no current is transmitted though the sea. The power supply is insulated from ground and the current is fed from the power supply through the pipe, and returns through the cable, whereby a voltage level of zero Volts is obtained at the far end where the system is grounded, and all the current is forced through the cable(s) and the pipe/flowline.

公开(公告)号：NO319369B1

公开(公告)日：2005-07-25

申请号：NO20023335

申请日：2002-07-11

Applicant: NEXANS

Inventor： VARRENG JAN SVERRE ,  IVERSEN OYVIND

IPC: H01R13/52 ,  H01R13/523 ,  H02G15/013

公开(公告)号：BR0302296A

公开(公告)日：2004-09-08

申请号：BR0302296

申请日：2003-07-11

Applicant: NEXANS

Inventor： VARRENG JAN SVERRE ,  IVERSEN OYVIND

IPC: H01R13/52 ,  H01R13/523

公开(公告)号：GB2373321A

公开(公告)日：2002-09-18

申请号：GB0130939

申请日：2001-12-24

Applicant: NEXANS

Inventor： MJELSTAD EINAR ,  IVERSEN OYVIND ,  CLASEN TORUNN LUND

IPC: F16L53/00 ,  F24H1/10 ,  H05B3/40 ,  E21B43/01

Abstract: An offshore installation 3 comprises a flowline umbilical installed between a platform and sea bed based template and including at least one insulated electrical cable conductor 2 connected in series with a pipe 1 for carrying fluids such oil or gas to a power supply. The template interconnection between the cable conductor 2 and the pipe 1 is grounded to seawater 4 to provide a single point 5 grounded system such that all the current flows in the cable conductor 2, and substantially no current is transmitted through the sea 4 and the system has zero volts at the template. The power supply may be insulated from ground and the current may be fed from the power supply through the pipe 1 which is electrically insulated, and returns through the cable conductor 2 whereby a voltage level of zero volts is obtained at the template where the system is grounded and substantially all the current is forced through the cable conductor 2 and the pipe 1. The flowline umbilical may comprise a central steel tube for forming the pipe 1 and at least one layer of external concentric insulation material around the pipe as well as a number of elongated elements including at least one power cable conductor 2 located around said insulation layer and an outer protective sleeve.