WO2015181040A2 - Protective mat for a subsea asset - Google Patents

Protective mat for a subsea asset Download PDF

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Publication number
WO2015181040A2
WO2015181040A2 PCT/EP2015/061253 EP2015061253W WO2015181040A2 WO 2015181040 A2 WO2015181040 A2 WO 2015181040A2 EP 2015061253 W EP2015061253 W EP 2015061253W WO 2015181040 A2 WO2015181040 A2 WO 2015181040A2
Authority
WO
WIPO (PCT)
Prior art keywords
mat
elements
columns
lateral sides
pair
Prior art date
Application number
PCT/EP2015/061253
Other languages
French (fr)
Other versions
WO2015181040A3 (en
Inventor
Barry Dempsey
Original Assignee
Barry Dempsey
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Barry Dempsey filed Critical Barry Dempsey
Publication of WO2015181040A2 publication Critical patent/WO2015181040A2/en
Publication of WO2015181040A3 publication Critical patent/WO2015181040A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/123—Devices for the protection of pipes under water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/20—Accessories therefor, e.g. floats, weights
    • F16L1/24—Floats; Weights
    • 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
    • H02G9/00—Installations of electric cables or lines in or on the ground or water
    • H02G9/02—Installations of electric cables or lines in or on the ground or water laid directly in or on the ground, river-bed or sea-bottom; Coverings therefor, e.g. tile
    • H02G9/025—Coverings therefor, e.g. tile
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
    • E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
    • E02B3/123—Flexible prefabricated covering elements, e.g. mats, strips mainly consisting of stone, concrete or similar stony material

Definitions

  • This invention relates to a protective mat for elongate subsea assets, such as pipe lines, umbilicals, hydraulic hoses or electrical cables and in particular to a protective mat to be laid over a subsea asset upon the seabed to protect the subsea asset from damage.
  • subsea assets such as pipe lines, umbilicals, hydraulic hoses or electrical cables
  • a prior art protective mat 1 comprises an array of rectangular concrete blocks 2 linked together by ropes (not shown) to define a flexible rectangular unitary mat that may be laid over the pipeline or other subsea asset.
  • the lateral faces of the blocks 2 are tapered towards the outer faces of the mat, such that the blocks 2 can be articulated to allow the mat 1 to conform to the shape of the subsea asset and adjacent seabed.
  • the ropes are provided in the form of a net.
  • the concrete blocks 2 may be cast in a mould within which the net is located so that the ropes are embedded within the blocks 2.
  • the ropes may extend beyond the array of blocks so that the ropes can be used to facilitate lifting and handling of the mat.
  • Such known concrete mats 1 can be used to cover a pipeline or other subsea asset when the run of the subsea asset is relatively straight, a series of rectangular mats being placed side by side in abutting contact with each other along the length of the subsea asset.
  • gaps tend to remain between adjacent mats 1A,1 B due to the rectangular overall shape of the mats.
  • Such gaps are typically covered by placing sandbags 3 over the subsea asset in said curved regions.
  • the placement of individual sandbags is a time consuming process and can cause difficulties when the subsea asset is decommissioned due to the requirement to remove the subsea asset and associated structures from the seabed.
  • a protective mat for an elongate object such as a pipeline, umbilical, hose or cable
  • said mat comprising an array of negative buoyancy elements, each element being joined to at least one adjacent element by respective flexible connections to define an articulated unitary mat, said elements being arranged in a plurality of rows and columns such that the mat has a square or rectangular profile in plan view, wherein the adjoining lateral sides of the elements in at least one pair of columns lying adjacent to one another are arranged on a common axis at an acute angle to the opposite lateral sides of the elements in each of said at least one pair of columns, such that the elements may be separated from each other along said common axis between adjoining lateral sides of the elements in said at least one pair of columns to separate the mat into two or more wedge shaped segments.
  • the opposite lateral sides of the elements in said at least one pair of columns to said adjoining lateral sides are arranged on respective common axes extending parallel to one another.
  • the lateral sides of the elements in each column of said at least one pair of columns are arranged at an angle of around 1 1 ° to one another.
  • the lateral sides of the elements in each column of said at least one pair of columns are arranged at an angle of 1 1 .25° to one another.
  • said negative buoyancy elements comprise concrete blocks.
  • said flexible connections comprise ropes extending through and between said elements.
  • Said flexible connections may extend beyond the peripheral sides of elements forming outer sides of the mat such that the flexible connections can be used to lift and/or handle the mat.
  • the flexible connections define loops beyond the outer sides of the mat where the flexible connections pass between adjacent row and/or columns of said elements.
  • the flexible connections extending between the elements in each row and columns may be interconnected in the form of a net and may be embedded within the elements, for example by casting the elements around the flexible connections in a suitable mould.
  • the side faces of the elements may be tapered towards front and rear faces of the mat to allow articulation of the mat.
  • Figure 1 shows a prior art pipeline protection mat
  • FIG 2 shows the prior art pipeline protection mat of Figure 1 in use
  • Figure 3 shows a protective mat for a subsea asset in accordance with a first embodiment of the present invention
  • Figure 4 shows a separated segment of the mat of Figure 3
  • Figure 5 shows a protective mat for a subsea asset in accordance with a further embodiment of the present invention
  • Figure 6 shows a separated segment of the mat of Figure 5.
  • FIGS 7 to 10 show the mat of Figure 5 in use.
  • the prior art protective mat for protecting a subsea asset such as a pipe line, umbilical, hydraulic hose or electrical cable, as illustrated in Figures 1 and 2 has the problem that the rectangular shape of the mat 1 , having blocks 2 arranged in orthogonally directed rows and columns with parallel opposed lateral sides, does not facilitate the covering of elongate subsea assets that follow a curved or sinuous path, requiring the use of sandbags 3 to cover any gaps between adjacent mats.
  • the mat 10 comprises a rectangular or square array of individual concrete blocks 12, said blocks 12 being arranged in a plurality of orthogonally arranged rows and columns, the blocks 1 being linked together by ropes 14,16, tapes, webs or similar flexible linking means, preferably in the form of a net embedded within the blocks and extending between adjacent rows and columns of the blocks to define an articulated unitary mat 10 that may be laid over a subsea asset or portion of the seabed, whereby the mat 10 may flex to cover the subsea asset and to conform to the shape of the seabed.
  • said ropes 14,16 are formed from material resistant to sunlight, water and other harmful elements to which the ropes 14,16 may be exposed, such as polypropylene.
  • the portions of the ropes 14,16 extending between selected rows and columns may be cut to reduce the mat 10 into segments, as desired.
  • the ropes 14,16 extend beyond the peripheral sides of the mat 10 to define loops 18,20 where the ropes pass between adjacent row and columns of the blocks 12, such loops 18,20 facilitating lifting and/or handling of the mat 10.
  • each column of blocks 12 defines a wedge shaped segment 26 having non-parallel lateral sides.
  • the columns are arranged in pairs having adjoining angled sides so that each pair of columns possesses substantially parallel lateral sides, such that the columns and rows of blocks 12 forming the unitary mat 10 define, between them, an overall rectangular shape.
  • Adjoining sides of the respective blocks 12 in each pair of columns of the mat 10 are arranged on a common axis extending an acute angle to said parallel lateral sides of the respective pair of columns, said common axis preferably being arranged at an angle of 1 1 .25° to said parallel lateral sides of the respective pair.
  • the tapered shape of the segments 26 causes the width of the individual blocks 12 in each column to vary between a minimum width at one end of the mat 10 to a maximum width at a second, opposite end of the mat 10.
  • the maximum width of the blocks 12 may become too large for easy handling. Therefore, in a mat 100 in an alternative embodiment of the invention, illustrated in Figures 5 and 6, the largest 1 /3 to 112 of the blocks 1 12 in each segment 126 of the mat, towards one end of each segment 126, may be formed from two separate elements 1 12A,1 12B, comprising a rectangular element 1 12A having parallel opposed lateral sides and a trapezoidal elements 1 12B having non-parallel opposed lateral sides.
  • individual tapered segments 126 may be separated from the remainder of the mat (by cutting the adjoining ropes 1 16 extending between adjacent columns/segments 126), and combined to provide the desired angle.
  • the choice of angle of 1 1 .25° allows four segments 126 to be combined to cover a 45° bend, as shown in Figure 10.
  • the protective may in accordance with the present invention greatly facilitates the protection of curved or sinuous sections of a subsea asset, such as a pipe line, umbilical, hydraulic hose or electrical cable, by enabling wedge shaped segments to be separated from the mat, such segments being laid over curved regions of the subsea asset as required.
  • the use of such wedge shaped segments also greatly facilitates decommissioning of the subsea asset when compared to the prior art method of using individual sand bags to cover curved or sinuous sections thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Abstract

A protective mat for an elongate object such as a pipeline, umbilical, hose or cable, said mat comprising an array of negative buoyancy elements, each element being joined to at least one adjacent element by respective flexible connections to define an articulated unitary mat, said elements being arranged in a plurality of rows and columns such that the mat has a square or rectangular overall profile in plan view, wherein the adjoining lateral sides of the elements in at least one pair of columns lying adjacent to one another are arranged on a common axis at an acute angle to the opposite lateral sides of the elements in each of said at least one pair of columns, such that the elements may be separated from each other along said common axis between adjoining lateral sides of the elements in said at least one pair of columns to separate the mat into two or more wedge shaped segments.

Description

Protective Mat for a Subsea Asset
This invention relates to a protective mat for elongate subsea assets, such as pipe lines, umbilicals, hydraulic hoses or electrical cables and in particular to a protective mat to be laid over a subsea asset upon the seabed to protect the subsea asset from damage.
Offshore oil and gas pipelines, umbilicals, hydraulic hoses and electrical cables (hereinafter referred to collectively as subsea assets) leading from stationary marine structures to the shore or between two stationary marine structures are typically laid directly upon the seabed and are thus exposed to the effects of currents and also exposed to the possibility of impact damage. To stabilise and protect such subsea assets it is known to lay concrete mats over them. As illustrated in Figure 1 , a prior art protective mat 1 comprises an array of rectangular concrete blocks 2 linked together by ropes (not shown) to define a flexible rectangular unitary mat that may be laid over the pipeline or other subsea asset. The lateral faces of the blocks 2 are tapered towards the outer faces of the mat, such that the blocks 2 can be articulated to allow the mat 1 to conform to the shape of the subsea asset and adjacent seabed. Typically the ropes are provided in the form of a net. The concrete blocks 2 may be cast in a mould within which the net is located so that the ropes are embedded within the blocks 2. The ropes may extend beyond the array of blocks so that the ropes can be used to facilitate lifting and handling of the mat.
Such known concrete mats 1 can be used to cover a pipeline or other subsea asset when the run of the subsea asset is relatively straight, a series of rectangular mats being placed side by side in abutting contact with each other along the length of the subsea asset. However, as shown in Figure 2, where the subsea asset has a sinuous path or has curved regions, gaps tend to remain between adjacent mats 1A,1 B due to the rectangular overall shape of the mats. Such gaps are typically covered by placing sandbags 3 over the subsea asset in said curved regions. However, the placement of individual sandbags is a time consuming process and can cause difficulties when the subsea asset is decommissioned due to the requirement to remove the subsea asset and associated structures from the seabed.
According to the present invention there is provided a protective mat for an elongate object such as a pipeline, umbilical, hose or cable, said mat comprising an array of negative buoyancy elements, each element being joined to at least one adjacent element by respective flexible connections to define an articulated unitary mat, said elements being arranged in a plurality of rows and columns such that the mat has a square or rectangular profile in plan view, wherein the adjoining lateral sides of the elements in at least one pair of columns lying adjacent to one another are arranged on a common axis at an acute angle to the opposite lateral sides of the elements in each of said at least one pair of columns, such that the elements may be separated from each other along said common axis between adjoining lateral sides of the elements in said at least one pair of columns to separate the mat into two or more wedge shaped segments.
Preferably the opposite lateral sides of the elements in said at least one pair of columns to said adjoining lateral sides are arranged on respective common axes extending parallel to one another.
Preferably the lateral sides of the elements in each column of said at least one pair of columns are arranged at an angle of around 1 1 ° to one another. In a preferred embodiment the lateral sides of the elements in each column of said at least one pair of columns are arranged at an angle of 1 1 .25° to one another.
Preferably said negative buoyancy elements comprise concrete blocks.
Preferably said flexible connections comprise ropes extending through and between said elements. Said flexible connections may extend beyond the peripheral sides of elements forming outer sides of the mat such that the flexible connections can be used to lift and/or handle the mat. Preferably the flexible connections define loops beyond the outer sides of the mat where the flexible connections pass between adjacent row and/or columns of said elements. The flexible connections extending between the elements in each row and columns may be interconnected in the form of a net and may be embedded within the elements, for example by casting the elements around the flexible connections in a suitable mould.
The side faces of the elements may be tapered towards front and rear faces of the mat to allow articulation of the mat.
An protective mat in accordance with an embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which :-
Figure 1 shows a prior art pipeline protection mat;
Figure 2 shows the prior art pipeline protection mat of Figure 1 in use;
Figure 3 shows a protective mat for a subsea asset in accordance with a first embodiment of the present invention;
Figure 4 shows a separated segment of the mat of Figure 3;
Figure 5 shows a protective mat for a subsea asset in accordance with a further embodiment of the present invention;
Figure 6 shows a separated segment of the mat of Figure 5; and
Figures 7 to 10 show the mat of Figure 5 in use.
As discussed above, the prior art protective mat for protecting a subsea asset, such as a pipe line, umbilical, hydraulic hose or electrical cable, as illustrated in Figures 1 and 2 has the problem that the rectangular shape of the mat 1 , having blocks 2 arranged in orthogonally directed rows and columns with parallel opposed lateral sides, does not facilitate the covering of elongate subsea assets that follow a curved or sinuous path, requiring the use of sandbags 3 to cover any gaps between adjacent mats.
An improved protective mat 10 in accordance with a first embodiment of the present invention is illustrated in Figures 3 and 4. The mat 10 comprises a rectangular or square array of individual concrete blocks 12, said blocks 12 being arranged in a plurality of orthogonally arranged rows and columns, the blocks 1 being linked together by ropes 14,16, tapes, webs or similar flexible linking means, preferably in the form of a net embedded within the blocks and extending between adjacent rows and columns of the blocks to define an articulated unitary mat 10 that may be laid over a subsea asset or portion of the seabed, whereby the mat 10 may flex to cover the subsea asset and to conform to the shape of the seabed. Preferably said ropes 14,16 are formed from material resistant to sunlight, water and other harmful elements to which the ropes 14,16 may be exposed, such as polypropylene.
The portions of the ropes 14,16 extending between selected rows and columns may be cut to reduce the mat 10 into segments, as desired. The ropes 14,16 extend beyond the peripheral sides of the mat 10 to define loops 18,20 where the ropes pass between adjacent row and columns of the blocks 12, such loops 18,20 facilitating lifting and/or handling of the mat 10.
As can be seen from Figure 3, adjoining lateral sides 22,24 of the blocks in each pair of adjacent columns are arranged at an acute angle to the opposite lateral sides of the blocks in such pairs of adjacent columns, such that the lateral sides of the blocks 12 in each column converge, preferably at an angle of around 1 1 ° to one another. As such, each column of blocks 12 defines a wedge shaped segment 26 having non-parallel lateral sides. The columns are arranged in pairs having adjoining angled sides so that each pair of columns possesses substantially parallel lateral sides, such that the columns and rows of blocks 12 forming the unitary mat 10 define, between them, an overall rectangular shape. Adjoining sides of the respective blocks 12 in each pair of columns of the mat 10 are arranged on a common axis extending an acute angle to said parallel lateral sides of the respective pair of columns, said common axis preferably being arranged at an angle of 1 1 .25° to said parallel lateral sides of the respective pair.
This enables the blocks 12 in selected columns of the mat to be separated from the remainder of the mat 10 to define wedge shaped individual segments 26, as shown in Figure 4, having non-parallel lateral sides, such segments 26 being capable of being located alongside one another to cover a curved section of the subsea asset.
The tapered shape of the segments 26 causes the width of the individual blocks 12 in each column to vary between a minimum width at one end of the mat 10 to a maximum width at a second, opposite end of the mat 10. For larger mats, the maximum width of the blocks 12 may become too large for easy handling. Therefore, in a mat 100 in an alternative embodiment of the invention, illustrated in Figures 5 and 6, the largest 1 /3 to 112 of the blocks 1 12 in each segment 126 of the mat, towards one end of each segment 126, may be formed from two separate elements 1 12A,1 12B, comprising a rectangular element 1 12A having parallel opposed lateral sides and a trapezoidal elements 1 12B having non-parallel opposed lateral sides.
As shown in Figures 7 to 10, when it is desired to cover a curved section of the subsea asset, individual tapered segments 126 may be separated from the remainder of the mat (by cutting the adjoining ropes 1 16 extending between adjacent columns/segments 126), and combined to provide the desired angle. The choice of angle of 1 1 .25° allows four segments 126 to be combined to cover a 45° bend, as shown in Figure 10.
The protective may in accordance with the present invention greatly facilitates the protection of curved or sinuous sections of a subsea asset, such as a pipe line, umbilical, hydraulic hose or electrical cable, by enabling wedge shaped segments to be separated from the mat, such segments being laid over curved regions of the subsea asset as required. The use of such wedge shaped segments also greatly facilitates decommissioning of the subsea asset when compared to the prior art method of using individual sand bags to cover curved or sinuous sections thereof.
The invention is not limited to the embodiment(s) described herein but can amended or modified without departing from the scope of the present invention.

Claims

Claims
1 . A protective mat for an elongate object such as a pipeline, umbilical, hose or cable, said mat comprising an array of negative buoyancy elements, each element being joined to at least one adjacent element by respective flexible connections to define an articulated unitary mat, said elements being arranged in a plurality of rows and columns such that the mat has a square or rectangular overall profile in plan view, wherein the adjoining lateral sides of the elements in at least one pair of columns lying adjacent to one another are arranged on a common axis at an acute angle to the opposite lateral sides of the elements in each of said at least one pair of columns, such that the elements may be separated from each other along said common axis between adjoining lateral sides of the elements in said at least one pair of columns to separate the mat into two or more wedge shaped segments.
2. A mat as claimed in claim 1 , wherein the opposite lateral sides of the elements in said at least one pair of columns to said adjoining lateral sides are arranged on respective common axes extending parallel to one another.
3. A mat as claimed in claim 1 or claim 2, wherein the lateral sides of the elements in each column of said at least one pair of columns are arranged at an angle of around 1 1 ° to one another.
4. A mat as claimed in claim 1 or claim 2, wherein the lateral sides of the elements in each column of said at least one pair of columns are arranged at an angle of 1 1 .25° to one another.
5. A mat as claimed in any preceding claim, wherein said negative buoyancy elements comprise concrete blocks.
6. A mat as claimed in any preceding claim, wherein said flexible connections comprise ropes, tapes, webs or similar elongate flexible members extending through and between said elements.
7. A mat as claimed in any preceding claim, wherein said flexible connections extend beyond the peripheral sides of elements forming outer sides of the mat such that the flexible connections can be used to lift and/or handle the mat.
8. A mat as claimed in claim 7, wherein the flexible connections define loops beyond the outer sides of the mat where the flexible connections pass between adjacent row and/or columns of said elements.
9.. A mat as claimed in any of claims 6 to 8, wherein the flexible connections extending between the elements in each row and columns are interconnected in the form of a net and are embedded within the elements.
10. A mat as claimed in any of claims 6 to 9, wherein said flexible connections are embedded within the elements by casting the elements around the flexible connections in a suitable mould.
1 1 . A mat as claimed in any preceding claim, wherein side faces of the elements are tapered towards front and rear faces of the mat to allow articulation of the mat.
PCT/EP2015/061253 2014-05-27 2015-05-21 Protective mat for a subsea asset WO2015181040A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1409340.5 2014-05-27
GBGB1409340.5A GB201409340D0 (en) 2014-05-27 2014-05-27 Protective mat for a subsea asset

Publications (2)

Publication Number Publication Date
WO2015181040A2 true WO2015181040A2 (en) 2015-12-03
WO2015181040A3 WO2015181040A3 (en) 2016-01-21

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ID=51177466

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/061253 WO2015181040A2 (en) 2014-05-27 2015-05-21 Protective mat for a subsea asset

Country Status (2)

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GB (1) GB201409340D0 (en)
WO (1) WO2015181040A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3361004B1 (en) * 2017-02-08 2022-01-19 Pipeshield International Ltd A sub-sea mattress and lifting device therefor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4683156A (en) * 1986-04-11 1987-07-28 Waters Charles M Flexible blanket
GB9904819D0 (en) * 1999-03-03 1999-04-28 Odebrecht Oil & Gas Services L Protective mattress

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3361004B1 (en) * 2017-02-08 2022-01-19 Pipeshield International Ltd A sub-sea mattress and lifting device therefor

Also Published As

Publication number Publication date
GB201409340D0 (en) 2014-07-09
WO2015181040A3 (en) 2016-01-21

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