CA1045057A - Pipeline provided with a crack/buckle arrester combined with an anode - Google Patents
Pipeline provided with a crack/buckle arrester combined with an anodeInfo
- Publication number
- CA1045057A CA1045057A CA267,722A CA267722A CA1045057A CA 1045057 A CA1045057 A CA 1045057A CA 267722 A CA267722 A CA 267722A CA 1045057 A CA1045057 A CA 1045057A
- Authority
- CA
- Canada
- Prior art keywords
- pipeline
- crack
- anode
- buckle
- arrester
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052725 zinc Inorganic materials 0.000 claims description 9
- 239000011701 zinc Substances 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims description 2
- 239000013521 mastic Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims 1
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 5
- 239000010405 anode material Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004210 cathodic protection Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- -1 for example Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
-
- 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
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Pipeline Systems (AREA)
Abstract
A B S T R A C T
A pipeline, for example a submerged pipeline, provided with tubular or annular crack/buckle arresters which are arranged around, and at regular intervals along, the pipeline, wherein at least one crack/buckle arrester is combined with an anode of a suitable material.
A pipeline, for example a submerged pipeline, provided with tubular or annular crack/buckle arresters which are arranged around, and at regular intervals along, the pipeline, wherein at least one crack/buckle arrester is combined with an anode of a suitable material.
Description
r This invention relates to a pipeline having crack/
buckle arresters.
In pipelines, in particular in high-pressure gas pipelines, the danger exists that a crack develops in the wall of the pipeline and propagates in an axial direction through the wall of the pipeline at great speed.
Furthermore, in submerged pipelines collapse of the pipeline sometimes occurs and such a collapse or "buckle"
can propagate along the pipeline.
In order to stop a crack or a pipeline collapse propagating along the pipeline, it is known to provide the pipeline with crack/buckle arresters, which are arranged around, and at regular intervals along, the pipeline.
Such a crack/buckle arrester has, for example, the form of a tubular or annular element, arranged around a section of the pipeline. Embo~iments of such crack or buckle arresters are described, for example, in British patent specification No. 1,418,535, published on 24th ` ;
December 1975, or in British patent specification No. 1,383,527, published on 12th February, 1975 Furthermore, in order to reduce corrosion of pipe-lines, in particular submerged pipelines, pipelines are often provided with anodes of a suitable material, such as for example, zinc, so that cathodic protection of the pipsline is obtained.
:'1 ' ., ~. .
5~S7 It is an object of the invention to provide a crack/buckle arréster of the above kind~ which is combined with an anode, so that a device is obtained which can easily be handled during installation compared with the conventional arresters and separate anodes. A further advantage of the proposed device ac-cording to the invention is that it has the possibility of using the tubular or annular element of the arrester itself as a base plate for the anode, so that less re-inforcement elements incorporated in the anode are i;
required as compared with the conventional separate anodes.
The invention relates more in particular to a pipe-line, for example a submerged pipeline, provided with tubular or annular crack/buckle arresters, which are arranged around, and at regular intervals along, the pipeline, wherein at least one cracktbuckle arrester is combined with an anode of a suitable material.
In a preferred embodiment of the invention, the crack/buckle arrester comprises at least one tubular or annular element adapted to be arranged around and to be secured to the pipeline and the anode comprises at least one tubular or annular element arranged around and secured to the crack/buckle arrester.
~L~4S~5~
The anode is preferably made of zinc.
Another advantage of the device according to the :lnvention is that because the crack/buckle arrester is combined with the anode, the crack/buckle arrester is included in the cathodic protection system. In other words, in this way corrosion of both the crack/buckle arrester and the pipeline is reduced.
The invention will be further explained with reference to the drawings,wherein:
Figure 1 shows a longitudinal cross-section of a first embodiment of the device according to the in-vention.
Figure 2 shows a longitudinal cross-section of a second embodiment of the device according to the in-vention.
Figure 3 shows a longitudinal cross-section of a ~
third embodiment of the device according to the in- -vention.
Figure 4 shows a longitudinal cross-section of a fourth embodiment of the device according to the in vention.
In figure 1 a steel pipeline 1 is provided with a steel tubular element 2 which forms the crack/buckle arrester and which is arranged around the pipeline 1 -and is secured to the outer wall of the pipeline 1 in .,'~' .
, 5~?57 --5~
a suitable manner, for example, by means of a suitable compound 4, such as an epoxy resin compound, a poly-urethane compound, concrete, mastic or a two-components filler. Instead, it is possible to secure the crack/
buckle arrester 2 to the outer wall of the pipeline 1 by means of welding or by shrinking. An anode having the form of a tubular element 3 is arranged around the arrester 2. The anode 3 is made of a suitable anode material, such as zinc, for example. The anode 3 is -anchored to the arrester 2 by means of suitable anchors 5, which have the form of radial teeth protruding --from the arrester 2 as shown, The anode 3 is connected to the pipeline 1 by means of electrically insulated -electrical conduits 7. The reference numeral 6 in- ;!
dicates the conventional concrete weight coating of the pipeline. The outer surface of the pipeline 1 is normally provided with a suitable anti-corrosion coating (not shown).
In figure 2, a steel tubular element 22, which forms the crack/buckle arrester, is arranged around a pipeline 21 and is secured to the outer ~ll of the steel pipeline 21 in any suitable manner, for example ;-~
by means of a suitable compound as mentioned in the above or by shrinking or welding. An anode having the form of a tubular ele~ent 23 is arranged around the .'.
5 ~ 5 arrester 22. The anode 23 is made of a suitable anode material, such as zinc, for example. The anode 23 is anchored to the arres~er 22 by annular radial ex-tensions 25 which protrude from the arrester 22 as shown. The anode 23 is connected to the pipeline 21 by means of electrically insulated electrical conduits 27, The reference numeral 26 indicates the conventional concrete weight coating of the pipeline 21.
In figure 3, a steel tubular element 32, which forms the crack/buckle arrester, is arranged around and is secured to the outer wall of a steel pipeline 31 in any suitable manner, for example by means of a suitable compound as mentioned in the above or by ~elding or shrinking. An anode having the form of a tubul~r element 33 is arranged around the arrester 32 ;
in the manner as shown. The anode 33 is made of a suit-able material, such as zinc, for example. The anode 33 is anchored to the arrester 32 by suitable anchors, such as radial teeth 35, which protrude from the 20 arrester 32 as shown. The anode 33 is connected to the pipeline 31, by means of electrically insulated electrical conduits 37. The reference numeral 36 indicates the conventional concrete weight coating of the pipeline 31.
The basic difference between the embodiment ac-25 cording to figure 4 and the embodiments according to . . .
.. :
.
5~157 .
figures 1 through 3 is that the tubular or annular element which forms the crack/buckle arrester :is arranged around the tubular or annular element which forms the anode. Thus, an anode having the form of a tubular element 43 is arranged around a pipeline 41 and secured to the outer wall of the pipeline 41 and enclosed between steel ring segments or collars 48.
Around the anode 43 are arranged two annular elements 42 which form the crack/buckle arresters. These two arresters 42 are anchored to the anode 43 by means of inwardly protruding radial teeth 45 as shown. If desired, the two arresters 42 can be interconnected by suitable means, for example by axial metal bars or strips (not shown). The anode 43 is connected to the pipeline 41 by means of electrically insulated electrical conduits 47. The reference numeral 46 indicates the conventional concrete weight coating 46. The anode 43 is made of a i~
suitable anode material such as, for example, zinc.
The tubular or annular elements 2, 22, 32 and 42, which form the crack/buckle arresters, should be made of a suitable metal, such as, for example, a ductile steel of high tensile strength.
The tubular or annular anode may consist of one piece or it may consist of a number ~ segments or parts which are interconnected by suitable means to form an '' '~
,"' ' ' '-'. ,.
' '~";'""''' ' ' . ~ .
..
: . . ~ : , ; . . . . . .. . .
~1~45~57 annular or tubular element.
The tubular or annular crack/buckle arrester may also consist of one piece or ik may consist of a number of segments or parts which are interconnected by suitable means to form a tubular or annular element, for example by bolts or welds.
It is remarked that in all the embodiments as described, the pipeline is provided with a weight coating. However, if desired, it is possible to apply the invention to pipelines which are not ;
provided with a weight coating.
Furthermore, attention is drawn to the fact that it is possible to connect the electrical conduits directly to the crack/buckle arresters instead of directly to the anod~es as shown in the drawings, provided that a good electrical contact exists between the crack/b,lckle arrester and the anode.
Attention is drawn to the fact tha~ the anode can ~ , be anchored to the crack/buckle arrester in any suitable manner. The invention is not restricted to the anchoring means as shown in the drawings. Furthermore, the anode can be provided with suitable reinforcement means, such as for example axial or radial steel strips or wires which are incorporated in the anode. These steel strips or wires are preferably zinc-galvanized. In order to 5~5~
_9_ .
anchor the anode to ~he crack/buckle arrester, it is possible to weld gome parts of the said steel strips or wires, which p~otrude from the anode or are lying along the outer surface of the anode, to the crack/
.
buckle arrester.
It is not necessary to make the anode of zinc.
Instead, it is possib;e to make the anode of another suitable metal, such as for example aluminium.
It is not necessary to use a tubular or an annular anode. Instead, it is possible to use an anode comprising a number of separate parts, having for example the shape of bars which are secured to the tubular or annular crack/buckle arrester.
~', ' ,,`'' !' ', ' .. ' '."
,','', ~,: . " ' ': ' ''' ' '',", ' '', "',' ' :' ' .'
buckle arresters.
In pipelines, in particular in high-pressure gas pipelines, the danger exists that a crack develops in the wall of the pipeline and propagates in an axial direction through the wall of the pipeline at great speed.
Furthermore, in submerged pipelines collapse of the pipeline sometimes occurs and such a collapse or "buckle"
can propagate along the pipeline.
In order to stop a crack or a pipeline collapse propagating along the pipeline, it is known to provide the pipeline with crack/buckle arresters, which are arranged around, and at regular intervals along, the pipeline.
Such a crack/buckle arrester has, for example, the form of a tubular or annular element, arranged around a section of the pipeline. Embo~iments of such crack or buckle arresters are described, for example, in British patent specification No. 1,418,535, published on 24th ` ;
December 1975, or in British patent specification No. 1,383,527, published on 12th February, 1975 Furthermore, in order to reduce corrosion of pipe-lines, in particular submerged pipelines, pipelines are often provided with anodes of a suitable material, such as for example, zinc, so that cathodic protection of the pipsline is obtained.
:'1 ' ., ~. .
5~S7 It is an object of the invention to provide a crack/buckle arréster of the above kind~ which is combined with an anode, so that a device is obtained which can easily be handled during installation compared with the conventional arresters and separate anodes. A further advantage of the proposed device ac-cording to the invention is that it has the possibility of using the tubular or annular element of the arrester itself as a base plate for the anode, so that less re-inforcement elements incorporated in the anode are i;
required as compared with the conventional separate anodes.
The invention relates more in particular to a pipe-line, for example a submerged pipeline, provided with tubular or annular crack/buckle arresters, which are arranged around, and at regular intervals along, the pipeline, wherein at least one cracktbuckle arrester is combined with an anode of a suitable material.
In a preferred embodiment of the invention, the crack/buckle arrester comprises at least one tubular or annular element adapted to be arranged around and to be secured to the pipeline and the anode comprises at least one tubular or annular element arranged around and secured to the crack/buckle arrester.
~L~4S~5~
The anode is preferably made of zinc.
Another advantage of the device according to the :lnvention is that because the crack/buckle arrester is combined with the anode, the crack/buckle arrester is included in the cathodic protection system. In other words, in this way corrosion of both the crack/buckle arrester and the pipeline is reduced.
The invention will be further explained with reference to the drawings,wherein:
Figure 1 shows a longitudinal cross-section of a first embodiment of the device according to the in-vention.
Figure 2 shows a longitudinal cross-section of a second embodiment of the device according to the in-vention.
Figure 3 shows a longitudinal cross-section of a ~
third embodiment of the device according to the in- -vention.
Figure 4 shows a longitudinal cross-section of a fourth embodiment of the device according to the in vention.
In figure 1 a steel pipeline 1 is provided with a steel tubular element 2 which forms the crack/buckle arrester and which is arranged around the pipeline 1 -and is secured to the outer wall of the pipeline 1 in .,'~' .
, 5~?57 --5~
a suitable manner, for example, by means of a suitable compound 4, such as an epoxy resin compound, a poly-urethane compound, concrete, mastic or a two-components filler. Instead, it is possible to secure the crack/
buckle arrester 2 to the outer wall of the pipeline 1 by means of welding or by shrinking. An anode having the form of a tubular element 3 is arranged around the arrester 2. The anode 3 is made of a suitable anode material, such as zinc, for example. The anode 3 is -anchored to the arrester 2 by means of suitable anchors 5, which have the form of radial teeth protruding --from the arrester 2 as shown, The anode 3 is connected to the pipeline 1 by means of electrically insulated -electrical conduits 7. The reference numeral 6 in- ;!
dicates the conventional concrete weight coating of the pipeline. The outer surface of the pipeline 1 is normally provided with a suitable anti-corrosion coating (not shown).
In figure 2, a steel tubular element 22, which forms the crack/buckle arrester, is arranged around a pipeline 21 and is secured to the outer ~ll of the steel pipeline 21 in any suitable manner, for example ;-~
by means of a suitable compound as mentioned in the above or by shrinking or welding. An anode having the form of a tubular ele~ent 23 is arranged around the .'.
5 ~ 5 arrester 22. The anode 23 is made of a suitable anode material, such as zinc, for example. The anode 23 is anchored to the arres~er 22 by annular radial ex-tensions 25 which protrude from the arrester 22 as shown. The anode 23 is connected to the pipeline 21 by means of electrically insulated electrical conduits 27, The reference numeral 26 indicates the conventional concrete weight coating of the pipeline 21.
In figure 3, a steel tubular element 32, which forms the crack/buckle arrester, is arranged around and is secured to the outer wall of a steel pipeline 31 in any suitable manner, for example by means of a suitable compound as mentioned in the above or by ~elding or shrinking. An anode having the form of a tubul~r element 33 is arranged around the arrester 32 ;
in the manner as shown. The anode 33 is made of a suit-able material, such as zinc, for example. The anode 33 is anchored to the arrester 32 by suitable anchors, such as radial teeth 35, which protrude from the 20 arrester 32 as shown. The anode 33 is connected to the pipeline 31, by means of electrically insulated electrical conduits 37. The reference numeral 36 indicates the conventional concrete weight coating of the pipeline 31.
The basic difference between the embodiment ac-25 cording to figure 4 and the embodiments according to . . .
.. :
.
5~157 .
figures 1 through 3 is that the tubular or annular element which forms the crack/buckle arrester :is arranged around the tubular or annular element which forms the anode. Thus, an anode having the form of a tubular element 43 is arranged around a pipeline 41 and secured to the outer wall of the pipeline 41 and enclosed between steel ring segments or collars 48.
Around the anode 43 are arranged two annular elements 42 which form the crack/buckle arresters. These two arresters 42 are anchored to the anode 43 by means of inwardly protruding radial teeth 45 as shown. If desired, the two arresters 42 can be interconnected by suitable means, for example by axial metal bars or strips (not shown). The anode 43 is connected to the pipeline 41 by means of electrically insulated electrical conduits 47. The reference numeral 46 indicates the conventional concrete weight coating 46. The anode 43 is made of a i~
suitable anode material such as, for example, zinc.
The tubular or annular elements 2, 22, 32 and 42, which form the crack/buckle arresters, should be made of a suitable metal, such as, for example, a ductile steel of high tensile strength.
The tubular or annular anode may consist of one piece or it may consist of a number ~ segments or parts which are interconnected by suitable means to form an '' '~
,"' ' ' '-'. ,.
' '~";'""''' ' ' . ~ .
..
: . . ~ : , ; . . . . . .. . .
~1~45~57 annular or tubular element.
The tubular or annular crack/buckle arrester may also consist of one piece or ik may consist of a number of segments or parts which are interconnected by suitable means to form a tubular or annular element, for example by bolts or welds.
It is remarked that in all the embodiments as described, the pipeline is provided with a weight coating. However, if desired, it is possible to apply the invention to pipelines which are not ;
provided with a weight coating.
Furthermore, attention is drawn to the fact that it is possible to connect the electrical conduits directly to the crack/buckle arresters instead of directly to the anod~es as shown in the drawings, provided that a good electrical contact exists between the crack/b,lckle arrester and the anode.
Attention is drawn to the fact tha~ the anode can ~ , be anchored to the crack/buckle arrester in any suitable manner. The invention is not restricted to the anchoring means as shown in the drawings. Furthermore, the anode can be provided with suitable reinforcement means, such as for example axial or radial steel strips or wires which are incorporated in the anode. These steel strips or wires are preferably zinc-galvanized. In order to 5~5~
_9_ .
anchor the anode to ~he crack/buckle arrester, it is possible to weld gome parts of the said steel strips or wires, which p~otrude from the anode or are lying along the outer surface of the anode, to the crack/
.
buckle arrester.
It is not necessary to make the anode of zinc.
Instead, it is possib;e to make the anode of another suitable metal, such as for example aluminium.
It is not necessary to use a tubular or an annular anode. Instead, it is possible to use an anode comprising a number of separate parts, having for example the shape of bars which are secured to the tubular or annular crack/buckle arrester.
~', ' ,,`'' !' ', ' .. ' '."
,','', ~,: . " ' ': ' ''' ' '',", ' '', "',' ' :' ' .'
Claims (23)
1. A pipeline provided with tubular or annular crack/buckle arresters which are arranged around, and at regular intervals along, the pipeline, wherein at least one crack/buckle arrester is combined with an anode of a suitable material.
2. Pipeline as claimed in claim 1, wherein the pipeline and the crack/
buckle arrester are made of steel.
buckle arrester are made of steel.
3. Pipeline as claimed in any one of the claims 1-2, wherein the anode is made of zinc.
4. Pipeline as claimed in claim 1, wherein the crack/buckle arrester comprises at least one tubular or annular element arranged around and secured to the pipeline and the anode comprises at least one tubular or annular element arranged around and secured to the crack/buckle arrester.
5. Pipeline as claimed in claim 4, wherein the crack/buckle arrester is secured to the outer surface of the wall of the pipeline by means of an epoxy resin.
6. Pipeline as claimed in claim 4, wherein the crack/buckle arrester is secured to the outer surface of the wall of the pipeline by means of a polyurethane.
7. Pipeline as claimed in claim 4, wherein the crack/buckle arrester is secured to the outer surface of the wall of the pipeline by means of a mastic.
8. Pipeline as claimed in claim 4, wherein the crack/buckle arrester is secured to the outer surface of the wall of the pipeline by means of a two-components filler.
9. Pipeline as claimed in claim 4, wherein the crack/buckle arrester is secured to the outer surface of the wall of the pipeline by means of a concrete.
10. Pipeline as claimed in claim 4, wherein the crack/buckle arrester is secured to the outer surface of the wall of the pipeline by means of a weld.
11. Pipeline as claimed in claim 4, wherein the crack/buckle arrester is secured to the outer surface of the wall of the pipeline by shrinking.
12. Pipeline as claimed in claim 1, wherein the anode comprises at least one tubular or annular element arranged around and secured to the pipeline and the crack/buckle arrester comprises at least one tubular or annular element arranged around and secured to the anode.
13. Pipeline as claimed in claim 12, wherein the anode is enclosed between collars extending from the outer surface of the wall of the pipeline.
14. Pipeline as claimed in any one of the claims 1, 4 or 12, wherein the anode is anchored to the crack/buckle arrester by means of radial extensions protruding from the crack/buckle arrester.
15. Pipeline as claimed in any one of the claims 1, 4 or 12, wherein reinforcement means in the form of axial or radial steel strips or wires are incorporated in the anode and some parts of said reinforcement means are welded to the said crack/buckle arrester in order to anchor the anode to the crack/buckle arrester.
16. Pipeline as claimed in any one of the claims 1, 4 or 12, wherein the anode comprises a number of separate parts secured to the crack/buckle arrester.
17. Pipeline as claimed in any one of the claims 1, 4 or 12, wherein the anode consists of a number of segments interconnected by suitable means so as to form a tubular or annular element.
18. Pipeline as claimed in any one of the claims 1, 4 or 12, wherein the tubular or annular crack/buckle arrester consists of a number of segments interconnected by suitable means to form a tubular or annular element.
19. Pipeline as claimed in any one of the claims 1, 4 or 12, wherein the anode is connected to the pipeline by an electrical conduit.
20. A tubular or annular crack/buckle arrester adapted to be arranged around, and at regular intervals along a pipeline as claimed in claim 1, wherein the crack/buckle arrester is combined with an anode of a suitable material.
21. Crack/buckle arrester as claimed in claim 20, wherein the crack/buckle arrester is made of steel and the anode is made of zinc.
22. Crack/buckle arrester as claimed in any one of the claims 20-21, wherein the crack/buckle arrester comprises at least one tubular or annular element adapted to be arranged around and to be secured to the pipeline and the anode comprises at least one tubular or annular element arranged around and secured to the crack/buckle arrester.
23. Crack/buckle arrester as claimed in any one of the claims 20-21, wherein the anode comprises at least one tubular or annular element adapted to be arranged around and to be secured to the pipeline and the crack/buckle arrester comprises at least one tubular or annular element arranged around and secured to the anode.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6605/76A GB1564621A (en) | 1976-02-19 | 1976-02-19 | Pipeline provided of a crack or collapse along the length of the pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1045057A true CA1045057A (en) | 1978-12-26 |
Family
ID=9817524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA267,722A Expired CA1045057A (en) | 1976-02-19 | 1976-12-13 | Pipeline provided with a crack/buckle arrester combined with an anode |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS6015836B2 (en) |
| AU (1) | AU512552B2 (en) |
| BE (1) | BE851276A (en) |
| CA (1) | CA1045057A (en) |
| DE (1) | DE2706895A1 (en) |
| FR (1) | FR2341811A1 (en) |
| GB (1) | GB1564621A (en) |
| IT (1) | IT1118067B (en) |
| NL (1) | NL7701673A (en) |
| NO (1) | NO770522L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8629938D0 (en) * | 1986-12-15 | 1987-01-28 | Raychem Sa Nv | Protection of joints in elongate substrates |
| NO307096B1 (en) | 1997-11-17 | 2000-02-07 | Aker Offshore Partner As | Corrosion-protected metal construction, for example in the form of a pipeline which may be part of a stronger pipe system |
| CN104482315A (en) * | 2014-12-23 | 2015-04-01 | 江苏省常熟环通实业有限公司 | Corrosion-resistant special steel pipe |
| CN107420743B (en) * | 2017-06-09 | 2023-06-13 | 中国计量大学 | A smart city gas PE pipe network measurement and control system and measurement and control method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7215881U (en) * | 1973-01-11 | Metallgesellschaft Ag | Fixing device for self-consuming anodes | |
| DE2122519A1 (en) * | 1971-05-06 | 1972-11-16 | The Tapecoat Co. Inc., Evanston, 111. (V.St.A.) | Sacrificial anode - with pipe protecting liner |
| DE2223312A1 (en) * | 1971-05-26 | 1972-12-07 | Continental Oil Co | Pipe, in particular drill pipe, and device and method for preventing corrosion and corrosion fracture in a pipe |
| US3768269A (en) * | 1972-04-07 | 1973-10-30 | Shell Oil Co | Mitigation of propagating collapse failures in pipelines due to external load |
| GB1383527A (en) * | 1972-05-26 | 1974-02-12 | British Petroleum Co | Pipelines |
| GB1524177A (en) * | 1977-03-30 | 1978-09-06 | Italsider Spa | Method for inhibiting the propagation of cracks in gaslines |
-
1976
- 1976-02-19 GB GB6605/76A patent/GB1564621A/en not_active Expired
- 1976-12-13 CA CA267,722A patent/CA1045057A/en not_active Expired
-
1977
- 1977-02-10 BE BE1007936A patent/BE851276A/en not_active IP Right Cessation
- 1977-02-17 JP JP52015603A patent/JPS6015836B2/en not_active Expired
- 1977-02-17 IT IT67351/77A patent/IT1118067B/en active
- 1977-02-17 DE DE19772706895 patent/DE2706895A1/en active Granted
- 1977-02-17 FR FR7704541A patent/FR2341811A1/en active Granted
- 1977-02-17 NL NL7701673A patent/NL7701673A/en not_active Application Discontinuation
- 1977-02-17 AU AU22397/77A patent/AU512552B2/en not_active Expired
- 1977-02-17 NO NO770522A patent/NO770522L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52100618A (en) | 1977-08-23 |
| GB1564621A (en) | 1980-04-10 |
| FR2341811A1 (en) | 1977-09-16 |
| DE2706895C2 (en) | 1988-05-26 |
| BE851276A (en) | 1977-08-10 |
| AU512552B2 (en) | 1980-10-16 |
| DE2706895A1 (en) | 1977-09-01 |
| FR2341811B1 (en) | 1981-07-31 |
| JPS6015836B2 (en) | 1985-04-22 |
| IT1118067B (en) | 1986-02-24 |
| AU2239777A (en) | 1978-08-24 |
| NL7701673A (en) | 1977-08-23 |
| NO770522L (en) | 1977-08-22 |
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