GB2560798A - Resin free subsea cable hang-off - Google Patents
Resin free subsea cable hang-off Download PDFInfo
- Publication number
- GB2560798A GB2560798A GB1800939.9A GB201800939A GB2560798A GB 2560798 A GB2560798 A GB 2560798A GB 201800939 A GB201800939 A GB 201800939A GB 2560798 A GB2560798 A GB 2560798A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hang
- cable
- sections
- top hat
- seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000011347 resin Substances 0.000 title claims description 34
- 229920005989 resin Polymers 0.000 title claims description 34
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 230000013011 mating Effects 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 8
- 230000035515 penetration Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims 3
- 239000004814 polyurethane Substances 0.000 claims 3
- 239000010959 steel Substances 0.000 claims 3
- 229920000642 polymer Polymers 0.000 claims 2
- 238000005452 bending Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 229920002635 polyurethane Polymers 0.000 claims 1
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000005382 thermal cycling Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/007—Devices for relieving mechanical stress
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/02—Rod or cable suspensions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/013—Sealing means for cable inlets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/80—Arrangement of components within nacelles or towers
- F03D80/82—Arrangement of components within nacelles or towers of electrical components
- F03D80/85—Cabling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
- H02G1/10—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle in or under water
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Gasket Seals (AREA)
Abstract
A subsea power cable hang-off comprises the main body of the hang off 1. Flanges 4 along each mating edge of the half shell sections of the main body and a suitably sized gasket 3 between the mating faces flanges complete the air tight seal. The hang-off also incorporates two compression type sealing systems at the lower and upper sections of the hang-off assembly. The lower compression sealing system prevents any potentially corrosive air from passing inside the I/J tube and entering the hang-off assembly. The upper sealing system prevents any potentially corrosive air which could have entered the hang-off assembly from moving into the airtight platform.
Description
(54) Title of the Invention: Resin free subsea cable hang-off Abstract Title: Resin free hang-off for subsea power cables (57) A subsea power cable hang-off comprises the main body of the hang off 1. Flanges 4 along each mating edge of the half shell sections of the main body and a suitably sized gasket 3 between the mating faces flanges complete the air tight seal. The hang-off also incorporates two compression type sealing systems at the lower and upper sections of the hang-off assembly. The lower compression sealing system prevents any potentially corrosive air from passing inside the l/J tube and entering the hang-off assembly. The upper sealing system prevents any potentially corrosive air which could have entered the hang-off assembly from moving into the airtight platform.
Figure 1 /4
CD U W
Figure 1
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Figure 2
Figure 3
3/4
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Figure 4
Figure 5
4/4
Page Ί
Figure 6
Figure 7
Resin free hang-off for Subsea Power Cables to Offshore wind turbines
A subsea cable hang-off is used to hold a power cable within the transition piece of an off-shore wind turbine. The hang-off is attached to the transition piece airtight platform using a combination of bolts and flanges. The hang-off is designed to incorporate an air tight sealing system to prevent potentially corrosive air from passing across the airtight platform and accelerating the corrosion of the sensitive equipment with the airtight platform.
The majority of existing hang-off designs use a marine grade resin to achieve the air tight requirement. The resin is mixed and poured in to the hang-off after all potential leak paths have been sealed or taped.
However, the resin presents a number of problems relating to storage, preparation, application and disposal.
The resin requires specially made storage facilities with temperature control and bunds to contain any spillage. On board the cable installation vessels, these facilities need to incorporate specially designed sea-fastening and take up large amounts of deck space. The resin needs to be accommodated in these containers as the effects of thermal cycling from sunlight and cold temperatures will reduce the life of the resin. According to the resin manufacturers, the resin must be kept as warm as practical for a minimum of 6 hours before opening the container.
There are special instructions for the preparation and mixing of the resin, which if not carried out correctly can lead to soft spots of uncured resin that may lead to product failure.
When applying the resin, the resin level must be monitored and topped up if required. Depending on the surrounding air temperature, the usable life of the resin is reduced as is the viscosity, leading to reduced time to correctly apply the resin.
All used and unused resin containers must be disposed of by a licensed waste disposal company as the resin is deemed to be a controlled (hazardous) waste.
Many off-shore wind developers and cable installation companies wish to see an end to the use of resin to maintain the airtight seal within the transition piece of an off-shore wind turbine. One of the primary reasons for this has been led by the Health and Safety issues associated with the resin, with some laboratory tests showing small traces of carcinogens within the resin.
The resin free hang-off uses a combination of flanges and gaskets and two additional sealing systems, one at the lower part of the hang-off and the other at the top part of the hang-off.
The combination of gaskets, flanges and sealing systems removes the requirement to use a marine grade resin to provide the air tight seal required across the 'airtight' platform within the Off-shore wind turbine transition piece.
The lower sealing system forms a seal between the outside of the cable and the inside of the l/J tube. The upper sealing system forms a seal between the power cores (and fibre optic cable) and the upper part of the hang-off.
This hang-off design removes any reliance on the use of resin to form any sealing within the hangoff.
In addition to the information given above:
The hang-off is generally related to securing a subsea power cable to a previously installed (by the transition piece fabricator) hang-off flange inside the airtight platform of the Transition Piece of a Wind Turbine Generator.
The majority of existing hang-off designs use a marine grade resin to achieve the air tight seal across the hang-off assembly (body).
However, the resin presents a number of problems relating to storage, preparation, application and disposal.
The problem to be solved is to provide a mechanical clamping device which can meet the demands of the free hanging subsea power cable and maintain the cable in the desired position for the operating life of the wind turbine. The solution must also provide an air tight assembly preventing the migration of potentially corrosive air through the hang-off, without the use of marine grade resins.
The resin free hang-off is assembled using compressible gaskets between the mating faces of the component parts to prevent migration of corrosive air between the horizontal and vertical mating parts and incorporating a sealing system to prevent the corrosive air from moving through the space inside the hang-off body where the cable is installed within the hang-off.
The hang-off is manufactured as two separate halves to allow the hang-off to be assembled around the cable after the cable has been pulled though the interfacing flange / pipe. As the hang-off is assembled, the sections are installed off-set to the section below to ensure that the vertical joints between the mating faces are not directly over another join.
The following sections, with reference to the accompanying drawings describe the features and assembly of the resin free hang-off:
Figure 1 shows the main body of the hang-off (item 1) including the lower seal / clamp (item 2) above the interfacing flange (item 4) with the two halves of the interfacing gasket (item 3) between.
Figure 2 shows the main hang-off body (1) bolted to the interfacing flange (4). The image also shows the armour plates (item 5) and the Top Hat lower gasket (item 6).
Figure 3 shows the armour plates (5) and the Top Hat lower gasket (6) in position. The image also shows the Top Hat halves (item 9) and the Top Hat side gaskets (item 10).
Figure 4 shows the Top Hat halves (9) and the Top Hat side gaskets (10) in position. The Top Hat sections are held in position using 12 off M16 studs (item 11) including nuts and washers, which attach the sections to the main hang-off body. 4 off M12 bolts (item 13) including nuts and washers attach the two Top Hat halves together. The image also shows the three part upper seal (item 14) which fits inside the penetration formed by the Top Hat halves.
Figure 5 shows a plan view of the completed hang-off assembly including the three part upper seal.
Figure 6 shows a side elevation of the completed hang-off assembly including the three part upper seal and the lower seal / clamp.
Figure 7 shows an isometric view of the completed hang-off assembly.
The hang-off is assembled on top of an interfacing flange which forms the top part of a tube which passes through the airtight platform of the Transition Piece (TP). The tube and flange are installed as part of the TP by the TP fabricator. The interfacing flange is identified as item 4 in Figure 1.
Between the main body of the hang-off (item 1) and the interfacing flange (item 4) a gasket is fitted which is referred to as the interfacing flange gasket (item 3). The interfacing flange gasket (3) is fitted in two halves to allow the gasket to be fitted around the installed cable.
The main body of the hang-off (1) incorporates a combined lower seal and clamp (item 2) and two side gaskets (item 8). The main hang-off body is attached to the interfacing flange using 12 off IVI22 bolts (item 12) which pass through the outer flange of the hang-off and the interfacing flange.
Before securing the 12 off M22 bolts in the flange, the two halves of the hang-off body are brought together and attached to each other using 2 off M16 bolts identified as item 15. The M16 bolts pass through the side gaskets (item 8) maintaining the side gaskets between the two halves of the main hang-off body.
After the side flanges are secured and the hang-off is attached to the interfacing flange, the lower seal / clamp is activated by tightening the 8 off M20 bolts (item 7) which are located on the inside of the main hang-off body. When tightened, the M20 bolts compress the polymer material to form a seal and also provide a clamping mechanism to secure the cable in place until the permanent hangoff clamp is activated.
off armour plates (item 5) are fitted on to the main hang-off body inboard of the ring of 12 off M16 bolts (item 11). There is a small recess machined into the main body to ensure that the armour plates fit flush to the top edge of the hang-off body.
The cable serving is removed and the armour wires of the cable are cut and bent down over the armour plates (5). The wires are trimmed to the edge of the armour plates.
A gasket (item 6) is fitted over the M16 bolts (11). The gasket is supplied in two halves to allow assembly around the installed cable. The gasket is fitted so that the joint is off-set to the joint between the two halves of the hang-off body.
The two halves of the Top Hat (item 9) are fitted over the M16 bolts (11). There is a vertical gasket (item 10) installed between the vertical mating faces of the Top Hat sections. The two halves are held together using 4 off M12 bolts (item 13) including nuts and washers.
The three piece upper seal (item 14) is brought together above the Top Hat sections and around the individual power cores and Fibre Optic cable. The splits in the upper seal allow the seal to be positioned to allow the cores and fibre optic to pass through the penetrations in the seal. The seal is pushed down into the Top Hat penetration to complete the hang-off assembly.
Claims (26)
1. A subsea cable resin free hang-off comprising:
The main hang-off body manufactured in two separate halves to allow the hang-off to be assembled around an installed subsea power cable.
2. The apparatus of claim 1 wherein the attachment device to secure the apparatus to an interfacing flange is by means of 12 off M22 bolts c/w washers and nuts (6 off per half) and a split interfacing gasket between the interfacing flange and the outer flange of the main hang-off body to maintain an airtight seal between the interfacing flange and each half of the main hang-off body.
3. The apparatus of claim 1 wherein a gasket is incorporated between the two horizontal mating faces of the main hang-off body to maintain an airtight seal between the two mating faces.
4. The apparatus of claim 1 wherein the recess at the inner edges of the main hang-off body includes 8 off 22 mm diameter holes (4 off per half) through which 8 off M20 bolts (4 off per half) pass through to form the loading mechanism for the lower seal / clamp (temporary hang-off) device.
5. The device of claim 4 comprising three layers of 48 mm thick Polyurethane, two 4 mm thick steel plates and a 10 mm thick bottom plate, onto which are welded 4 off M20 bolts.
6. The device of claim 4 wherein there are three PU half shells, two 4 mm thick steel plates and one 10 mm thick plate with nuts for each half of the seal / clamp.
7. The device of claim 4 is activated by tightening the 8 off (4 off per half) M20 nuts which are located on top of the recess in each half of the main body of the hang-off.
8. The device of claim 4 whereas each nut is tightened, the bolts are pulled up through the 22 mm holes in the recess and in turn squeeze the PU half shells between the steel plates and the underside of the recess.
9. The device of claim 4, whereas tightened forms a seal around the outside of the cable and also a clamping force to maintain the cable in the desired position.
10. The apparatus of claim 1 also includes 12 off M16 studs located equally around the upper flange face of the main body of the hang-off.
11. The apparatus of claim 1 further comprises a second clamping mechanism, referred to as the permanent hang-off clamp.
12. The device of claim 11 whereas comprising two separate armour plates and two separate metallic half shells referred to as top hat sections.
13. The device of claim 11 whereas the top hat sections comprise two flat semi-circle plates with a 'half pipe' up-stand welded on top of each plate at the midpoint between the inner and outer edges.
14. The device of claim 11 furthermore incorporates two vertical side flanges welded to the vertical edges of the half pipes and the top facing edge of each flat semi-circle plate.
15. To secure the cable by the device of claim 9, firstly the armour plates in claim 10 and installed onto a 'step' in the inside edge of the main body of the hang-off, inside of the 12 off M16 studs referred to in claim 10.
16. The armour wires of the cable are cut and bent though (approximately) 90 degrees onto the armour plates.
17. The device of claim 11 whereas activated after bending the armour wires down, by installing the two top hat halves over the bent armour wires and onto the M16 studs.
18. The device of claim 11 whereas a polymer gasket installed between the underside of the top hat flat semi-circle sections and the upper flange face of the main body of the hang-off which supports the M16 studs maintains an airtight seal.
19. The device of claim 11 wherein is secured by installing M16 washers and nuts onto the M16 studs and bringing the underside of the top hat flat semi-circle sections down onto the armour wires to secure the wires between the armour plates and the top hat sections.
20. The device of claim 11 whereas the side flanges are secured using M12 bolts c/w washers and nuts installed through the side flanges of the top hat sections with a vertical gasket between the mating faces to maintain an airtight seal along the vertical sections of the device.
21. The apparatus of claim 1 further comprises an upper sealing system device.
22. The device of claim 21 whereas comprising three separate sections of polymer blocks moulded on the inner side to fit the outside diameter of the power core where two blocks also include the outside shape of the fibre optic cable and the outside edges of the blocks to fit the inner diameter of the top hat half pipe sections.
23. The device of claim 21 whereas is assembled around the power cores and fibre optic cable above the opening created by the two half pipe sections of the top hat coming together, so that the power cores pass through the three large penetrations and the fibre optic cable passes though the single smaller penetration of the device.
24. The device of claim 21 whereas forms the upper seal by sliding down the power cores and fibre optic cable and pushing into the opening created by the two half pipe sections of the top hat.
25. The device of claim 21 whereas has a small 'shoulder' around the upper edge which, when in contact with the top edge of the top hat half pipe sections, determines when the device is in the final sealing position.
26. The apparatus of claim 1 is completed by tightening all M16 nuts and M12 nuts and bolts to the required torque value.
Y1. The device of claim 21 whereas remains secure in the top hat half pipe sections and the device of claim 11 secures the armour wires of the cable sufficiently to achieve the required clamping force to maintain the cable in the correct position.
Intellectual
Property
Office
Application No: Claims searched:
GB1800939.9
All
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB1701118.0A GB201701118D0 (en) | 2017-01-23 | 2017-01-23 | Resin free hang-off for subsea power cables to offshore wind turbines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201800939D0 GB201800939D0 (en) | 2018-03-07 |
| GB2560798A true GB2560798A (en) | 2018-09-26 |
Family
ID=58463166
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1701118.0A Ceased GB201701118D0 (en) | 2017-01-23 | 2017-01-23 | Resin free hang-off for subsea power cables to offshore wind turbines |
| GB1800939.9A Withdrawn GB2560798A (en) | 2017-01-23 | 2018-01-19 | Resin free subsea cable hang-off |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1701118.0A Ceased GB201701118D0 (en) | 2017-01-23 | 2017-01-23 | Resin free hang-off for subsea power cables to offshore wind turbines |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB201701118D0 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020084308A1 (en) * | 2018-10-26 | 2020-04-30 | Sicame Uk Liimited | Improvements to cable hang off apparatus |
| WO2021180835A1 (en) * | 2020-03-12 | 2021-09-16 | Vos Prodect Innovations B.V. | Cable hang-off device |
| US20210320487A1 (en) * | 2020-04-14 | 2021-10-14 | Siemens Gamesa Renewable Energy A/S | Interface, method and system for connecting electrical elements |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2685146A1 (en) * | 2012-07-13 | 2014-01-15 | J.Ray McDermott, S.A. | Offshore horizontal product lay arrangement |
| WO2014047469A2 (en) * | 2012-09-20 | 2014-03-27 | Pentair Thermal Management | Downhole wellbore heating system and method |
| US20150034388A1 (en) * | 2013-07-31 | 2015-02-05 | National Oilwell Varco, L.P. | Downhole motor coupling systems and methods |
| US20150125216A1 (en) * | 2012-07-13 | 2015-05-07 | J. Ray Mcdermott, S.A. | Offshore Horizontal Product Lay Arrangement |
| US20150275610A1 (en) * | 2014-04-01 | 2015-10-01 | Cameron International Corporation | Rod hang-off system |
-
2017
- 2017-01-23 GB GBGB1701118.0A patent/GB201701118D0/en not_active Ceased
-
2018
- 2018-01-19 GB GB1800939.9A patent/GB2560798A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2685146A1 (en) * | 2012-07-13 | 2014-01-15 | J.Ray McDermott, S.A. | Offshore horizontal product lay arrangement |
| US20150125216A1 (en) * | 2012-07-13 | 2015-05-07 | J. Ray Mcdermott, S.A. | Offshore Horizontal Product Lay Arrangement |
| WO2014047469A2 (en) * | 2012-09-20 | 2014-03-27 | Pentair Thermal Management | Downhole wellbore heating system and method |
| US20150034388A1 (en) * | 2013-07-31 | 2015-02-05 | National Oilwell Varco, L.P. | Downhole motor coupling systems and methods |
| US20150275610A1 (en) * | 2014-04-01 | 2015-10-01 | Cameron International Corporation | Rod hang-off system |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020084308A1 (en) * | 2018-10-26 | 2020-04-30 | Sicame Uk Liimited | Improvements to cable hang off apparatus |
| GB2590864A (en) * | 2018-10-26 | 2021-07-07 | Sicame Uk Ltd | Improvements to cable hang off apparatus |
| GB2590864B (en) * | 2018-10-26 | 2023-02-15 | Sicame Uk Ltd | Hang off assembly with clamping arrangement |
| WO2021180835A1 (en) * | 2020-03-12 | 2021-09-16 | Vos Prodect Innovations B.V. | Cable hang-off device |
| NL2025114B1 (en) * | 2020-03-12 | 2021-10-20 | Vos Prodect Innovations B V | Cable hang-off device |
| US20210320487A1 (en) * | 2020-04-14 | 2021-10-14 | Siemens Gamesa Renewable Energy A/S | Interface, method and system for connecting electrical elements |
| EP3896808A1 (en) | 2020-04-14 | 2021-10-20 | Siemens Gamesa Renewable Energy A/S | Interface, method and system for connecting electrical elements |
| CN113541088A (en) * | 2020-04-14 | 2021-10-22 | 西门子歌美飒可再生能源公司 | Interface, method and system for connecting electrical components |
| TWI792261B (en) * | 2020-04-14 | 2023-02-11 | 丹麥商西門子歌美颯再生能源公司 | Interface, method and system for connecting electrical elements |
| US11600983B2 (en) * | 2020-04-14 | 2023-03-07 | Siemens Gamesa Renewable Energy A/S | Interface, method and system for connecting electrical elements |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201800939D0 (en) | 2018-03-07 |
| GB201701118D0 (en) | 2017-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |