CA1169790A - Stabilized sleeve arrestor - Google Patents
Stabilized sleeve arrestorInfo
- Publication number
- CA1169790A CA1169790A CA000397664A CA397664A CA1169790A CA 1169790 A CA1169790 A CA 1169790A CA 000397664 A CA000397664 A CA 000397664A CA 397664 A CA397664 A CA 397664A CA 1169790 A CA1169790 A CA 1169790A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- pipeline
- filler material
- pipe
- annular space
- 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
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
Abstract
Abstract of the Disclosure A stabilized sleeve arrestor is described as well as the method of mounting the same on a high pressure pipeline.
A cylindrical sleeve is first placed on the line pipe and has upper and lower openings formed therein. The ends of the sleeve are sealed with plastic tape or the like and reinforcing straps are mounted thereon. A urethane elastomer filler material is forced through the bottom opening to fill the annular space between the sleeve and the exterior surface of the pipe. The material is pumped into the annular space until it flows from the upper opening.
After curing, the reinforcing straps are removed. The filler material causes the sleeve to adhere to the pipe to prevent longitudinal displacement of the sleeve should a crack occur.
The filler material also prevents corrosion between the sleeve and the pipeline.
A cylindrical sleeve is first placed on the line pipe and has upper and lower openings formed therein. The ends of the sleeve are sealed with plastic tape or the like and reinforcing straps are mounted thereon. A urethane elastomer filler material is forced through the bottom opening to fill the annular space between the sleeve and the exterior surface of the pipe. The material is pumped into the annular space until it flows from the upper opening.
After curing, the reinforcing straps are removed. The filler material causes the sleeve to adhere to the pipe to prevent longitudinal displacement of the sleeve should a crack occur.
The filler material also prevents corrosion between the sleeve and the pipeline.
Description
7 ~ ~
STA~ILIZED SLEEVE ARRESTOR
This invention relates to a device Eor the arresting of propagating Eractures or cracks in a high pressure pipeline and the method of mountiny the same on the pipeline.
Many types of devices have been previously described for achieving fracture control in a high pressure pipeline.
If a fracture occurs in a pipeline and is unchecked, the fracture will continue to propagate along the length of the pipeline. It has been found that the positioning of a sleeve around the pipeline, if properly designed, will stop the fracture in most cases. Devices of this type are described in United States Patent Nos. 4,176,691; 4,180,104; and 4,195,669. The devices of the prior art although generally satisfactory in the arresting of a crack do pose some problems. For example, if the sleeve is too closely fitting on the pipeline, the sleeve will be extremely difficult to place on the pipe due to dimensional variations and out-of-roundness of the pipe. If the clearance between the sleeve and the pipeline is too great, the sleeve will not arrest the crack. A further problem associated with the prior art devices is that the sleeve itself may be longitudinally displaced by the crack or fracture which prevents the sleeve from performing its intended func-tion. A still further problem associated with the prior art is that severe corrosion problems can occur between the sleeve and the pipeline.
Therefore, it is a principal object of the invention to provide a method and means for the arresting of a crack or fracture in a high pressureu pipeline.
A further object of the invention is to provide a crack
STA~ILIZED SLEEVE ARRESTOR
This invention relates to a device Eor the arresting of propagating Eractures or cracks in a high pressure pipeline and the method of mountiny the same on the pipeline.
Many types of devices have been previously described for achieving fracture control in a high pressure pipeline.
If a fracture occurs in a pipeline and is unchecked, the fracture will continue to propagate along the length of the pipeline. It has been found that the positioning of a sleeve around the pipeline, if properly designed, will stop the fracture in most cases. Devices of this type are described in United States Patent Nos. 4,176,691; 4,180,104; and 4,195,669. The devices of the prior art although generally satisfactory in the arresting of a crack do pose some problems. For example, if the sleeve is too closely fitting on the pipeline, the sleeve will be extremely difficult to place on the pipe due to dimensional variations and out-of-roundness of the pipe. If the clearance between the sleeve and the pipeline is too great, the sleeve will not arrest the crack. A further problem associated with the prior art devices is that the sleeve itself may be longitudinally displaced by the crack or fracture which prevents the sleeve from performing its intended func-tion. A still further problem associated with the prior art is that severe corrosion problems can occur between the sleeve and the pipeline.
Therefore, it is a principal object of the invention to provide a method and means for the arresting of a crack or fracture in a high pressureu pipeline.
A further object of the invention is to provide a crack
-2- ~
g ~
arrestor for a pipeline which is easily installed thereon.
A further object of the invention is to provide a crack arrestor for a pipeline wherein corrosion between the crack arrestor and the pipeline is prevented.
A further object of the invention is to provide a crack arrestor for a pipeline which is prevented from longitudinal displacement on the pipeline.
A further object of the invention i5 to provide a crack arrestor for a pipeline which effectively halts the propagation of a fracture or crack in a high pressure pipeline.
These and other objects will be apparent to those skilled in the art.
This invention consists in the construction, arrrangements and combination of the various parts of the device, whereby the objects contemplated are attained as hereinafter more fully set forth, specifically pointed out in the claims, and illustrated in the accompanying drawings, in which:
Figure 1 is a top view of the crack arrestor of this invention mounted on a pipeline:
Figure 2 is a partial sectional view seen on lines 2-2 of Figure 1:
Figure 3 is a perspective view which illustrates the manner in which the crack arrestor is centered on the pipeline:
Figure ~ is a bottom view illustratiny the crack arrestor installed on the pipeline and having the tape material applied to the ends thereof:
Figure 5 is a view similar to Figure ~ except that 7 ~ 0 .
reinforcing straps have been placed over the tape material:
Fiyure 6 is a view similar to Figure 5 but which illustrates the manner in which the filler material is supplied to the annular space between the arrestor and the pipeline; and Figure 7 illustrates the installed crack arrestor on the pipeline with the reinforcing straps removed therefrom.
A cylindrical sleeve preferably approximately 24 inches long and having an outside diame-ter of 44.25 inches with a wall thickness of 0.6 ,inches is first placed on a length of the line pipe which in this example had an outside diameter o~ 42.0 inches. The ,sleeve is provided with centrally disposed openings at the top and bottom portions thereof.
The sleeve is first centered on the pipe by urethane wedges so that the annular space between the sleeve and the pipe is substantially equal around the circumference of the pipe.
Conventional pipeline tape is then wrapped around the ends of the arrestor and the pipe to seal the ends of the arrestor.
Nylon straps are then placed around the tape material and tightened. A 1/2 inch check valve (Zerk) fitting is installed in the bottom hole of the arrestor and a 6 inch line pipe nipple (overflow pipe) is installed in the upper hole. A urethane el~stomer filler material containing approximately 25 percent asphalt is heated to approximately 120F and pumped through the check valve in the bottom of the arrestor. The material is pumped into the annular space between the sleeve and the pipe until material flows outwardly through the overflow pipe. The filler material is allowed to cure or harden for approximately one hour. The reinforcing straps are then removed. The filler ma-terial, 7 ~ 0 ... .
positioned in the annular space between the sleeve and the pipe, causes the sleeve to adhere to the pipe to prevent longitudinal displacement of the sleeve should a crack occur.
The filler material also prevents corrosion between the sleeve and the pipeline.
The stabilized sleeve arrestor of this invention is referred to generally by the reference numeral 10 while the numeral 12 refers to a high pressure pipeline which would normally be comprised of a plurality of lengths of pipe 10 welded together at the ends thereof. Generally, each of the lengths would have a longitudinal weld seam extending the length thereof. In the particular embodiment described - herein, the line pipe of the pipeline 12 had a diameter of 42 inches and was X70 line pipe grade steel with a toughness of 30 foot-lbs Cv at minimum temperature. The arrestor includes a cylindrical sleeve 14 which preferably has an outside diameter of 44.25 inches, a length of 24 inches, a wall thickness of 0.6 inches and is comprised of X70 line pipe grade steel with a toughness of 110 foot-lbs Cv at minimum 20 temperature. Preferably, the leading edge corners of the sleeve are rounded but not tapered. Sleeve 14 is provided with an opening 1~ formed in the center plane at the top or upper portion thereof and an opening 18 formed in the bottom of the sleeve at the center plane thereof. Preferably, a 6 inch long pipe nipple is positioned in the opening 16 and a 1/2 inch check valve (Zerk) 20 is installed in the opening 18. The outside of the sleeve 14 is primed if desired and is slipped over one end of the pipe by any convenient means.
Preferably, the sleeve 14 is installed on a level, pretaped 30 and primed joint or length of the line pipe. Preferably, the ~ lB~79~
sleeve 14 is posi-tioned no closer than 6 feet to the end of the length of the pipe. It is very important that the sleeve 14 be ini-tially concentrically positioned on the pipe and the same is accomplished by a plurality of urethane wedges 22 which are driven between the sleeve 14 and the pipeline around the circumference thereof as illustrated in Figure 3 so that a substantially uniform annular space between the inside of the sleeve 14 and the exterior of the pipeline 12 is achieved. After the wedges 22 have been positioned as lO described, the ends of the sleeve 14 are sealed b~ taping with conventional pipeline tape. The tape 24 is stretched tightly around one end of the sleeve to cause it to seal on the pipe as well as the arrestor. Similarly, tape 26 is stretched or wrapped around the other end of the sleeve as just described.
The tape material 24 and 26 is then secure for filling by four nylon straps 28, 30, 32 and 34 or the like which are tightened with ratchets. Preferably, the straps should have a 5,000 pound test and should be placed as close to the 20 sleeve ends as possible on both the arrestor and the pipe.
A filler material is then inserted in the annular space between the sleeve 14 and the pipeline 12. The material used to fill the annular space is preferably a urethane elastomer containing approximately 25 percent asphalt as an extender.
The two components, resin and catalyst, are heated to ; approximately 120F, mixed together and pumped into the annular space by the pump 36 which is operatively connected to the valve 20 by conduit 38. It should be noted that the amount of asphalt extender may vary from 0 30 percent and 30 that the temperature to which the filler material is heated ~ ~9'~J~3 may vary depending upon the particular product and the manu-facturer's specifications. The material is pumped into the bottorn opening 18 through the valve 20 until sufEicient material flows outwardly through the overflow pipe and the opening 16 to insure that the annular space has be,en completely filled. ~he material in the annular space is referred to generally by -the reference numeral 40 in Figure 2. The positioning of the filler material in the annular space not only causes the sleeve to be secured or adhered to lO the pipeline, when hardened, but also excludes the air and other corrosive materials from the annular space. The filler material hardens in approximately one hour and the hardened material has a Shore A hardness of about 35. After the filler material 40 has hardened, the nylon straps 28, 30, 32 and 34 are removed which results in the ~rrestor illustrated in Figure 7. It is recommended that the exposed exterior surface of the sleeve be hand taped to prevent corrosion.
The sleeve arrestor of this invention functions in substantially the same manner as the prior art to halt a ~O crack or fracture moving down the length of the pipeline.
The sleeve arrestor adheres to the exterior surface of the pipeline and longitudinal displacement of the arrestor is prevented should a crack or fracture occur. The filler material 40 prevents the very serious problem of corrosion of the interior of the sleeve and the exterior of the pipeline.
The fact that the sleeve 14 is substantially larger than the pipeline insures that the sleeve may be rapidly installed on the pipeline to eliminate any problems normally associated with dirnensional variations and out-of-roundness of the 30 pipeline.
` ~6~7~
Thus it can be seen that a novel crack arrestor has been described for a pipeline which accomplishes at least all of its stated objectives. The method described herein insures that the crack a.rrestor will be in a s-table condition and will positively prevent corrosion between the arrestor and the pipeline.
: -8-
g ~
arrestor for a pipeline which is easily installed thereon.
A further object of the invention is to provide a crack arrestor for a pipeline wherein corrosion between the crack arrestor and the pipeline is prevented.
A further object of the invention is to provide a crack arrestor for a pipeline which is prevented from longitudinal displacement on the pipeline.
A further object of the invention i5 to provide a crack arrestor for a pipeline which effectively halts the propagation of a fracture or crack in a high pressure pipeline.
These and other objects will be apparent to those skilled in the art.
This invention consists in the construction, arrrangements and combination of the various parts of the device, whereby the objects contemplated are attained as hereinafter more fully set forth, specifically pointed out in the claims, and illustrated in the accompanying drawings, in which:
Figure 1 is a top view of the crack arrestor of this invention mounted on a pipeline:
Figure 2 is a partial sectional view seen on lines 2-2 of Figure 1:
Figure 3 is a perspective view which illustrates the manner in which the crack arrestor is centered on the pipeline:
Figure ~ is a bottom view illustratiny the crack arrestor installed on the pipeline and having the tape material applied to the ends thereof:
Figure 5 is a view similar to Figure ~ except that 7 ~ 0 .
reinforcing straps have been placed over the tape material:
Fiyure 6 is a view similar to Figure 5 but which illustrates the manner in which the filler material is supplied to the annular space between the arrestor and the pipeline; and Figure 7 illustrates the installed crack arrestor on the pipeline with the reinforcing straps removed therefrom.
A cylindrical sleeve preferably approximately 24 inches long and having an outside diame-ter of 44.25 inches with a wall thickness of 0.6 ,inches is first placed on a length of the line pipe which in this example had an outside diameter o~ 42.0 inches. The ,sleeve is provided with centrally disposed openings at the top and bottom portions thereof.
The sleeve is first centered on the pipe by urethane wedges so that the annular space between the sleeve and the pipe is substantially equal around the circumference of the pipe.
Conventional pipeline tape is then wrapped around the ends of the arrestor and the pipe to seal the ends of the arrestor.
Nylon straps are then placed around the tape material and tightened. A 1/2 inch check valve (Zerk) fitting is installed in the bottom hole of the arrestor and a 6 inch line pipe nipple (overflow pipe) is installed in the upper hole. A urethane el~stomer filler material containing approximately 25 percent asphalt is heated to approximately 120F and pumped through the check valve in the bottom of the arrestor. The material is pumped into the annular space between the sleeve and the pipe until material flows outwardly through the overflow pipe. The filler material is allowed to cure or harden for approximately one hour. The reinforcing straps are then removed. The filler ma-terial, 7 ~ 0 ... .
positioned in the annular space between the sleeve and the pipe, causes the sleeve to adhere to the pipe to prevent longitudinal displacement of the sleeve should a crack occur.
The filler material also prevents corrosion between the sleeve and the pipeline.
The stabilized sleeve arrestor of this invention is referred to generally by the reference numeral 10 while the numeral 12 refers to a high pressure pipeline which would normally be comprised of a plurality of lengths of pipe 10 welded together at the ends thereof. Generally, each of the lengths would have a longitudinal weld seam extending the length thereof. In the particular embodiment described - herein, the line pipe of the pipeline 12 had a diameter of 42 inches and was X70 line pipe grade steel with a toughness of 30 foot-lbs Cv at minimum temperature. The arrestor includes a cylindrical sleeve 14 which preferably has an outside diameter of 44.25 inches, a length of 24 inches, a wall thickness of 0.6 inches and is comprised of X70 line pipe grade steel with a toughness of 110 foot-lbs Cv at minimum 20 temperature. Preferably, the leading edge corners of the sleeve are rounded but not tapered. Sleeve 14 is provided with an opening 1~ formed in the center plane at the top or upper portion thereof and an opening 18 formed in the bottom of the sleeve at the center plane thereof. Preferably, a 6 inch long pipe nipple is positioned in the opening 16 and a 1/2 inch check valve (Zerk) 20 is installed in the opening 18. The outside of the sleeve 14 is primed if desired and is slipped over one end of the pipe by any convenient means.
Preferably, the sleeve 14 is installed on a level, pretaped 30 and primed joint or length of the line pipe. Preferably, the ~ lB~79~
sleeve 14 is posi-tioned no closer than 6 feet to the end of the length of the pipe. It is very important that the sleeve 14 be ini-tially concentrically positioned on the pipe and the same is accomplished by a plurality of urethane wedges 22 which are driven between the sleeve 14 and the pipeline around the circumference thereof as illustrated in Figure 3 so that a substantially uniform annular space between the inside of the sleeve 14 and the exterior of the pipeline 12 is achieved. After the wedges 22 have been positioned as lO described, the ends of the sleeve 14 are sealed b~ taping with conventional pipeline tape. The tape 24 is stretched tightly around one end of the sleeve to cause it to seal on the pipe as well as the arrestor. Similarly, tape 26 is stretched or wrapped around the other end of the sleeve as just described.
The tape material 24 and 26 is then secure for filling by four nylon straps 28, 30, 32 and 34 or the like which are tightened with ratchets. Preferably, the straps should have a 5,000 pound test and should be placed as close to the 20 sleeve ends as possible on both the arrestor and the pipe.
A filler material is then inserted in the annular space between the sleeve 14 and the pipeline 12. The material used to fill the annular space is preferably a urethane elastomer containing approximately 25 percent asphalt as an extender.
The two components, resin and catalyst, are heated to ; approximately 120F, mixed together and pumped into the annular space by the pump 36 which is operatively connected to the valve 20 by conduit 38. It should be noted that the amount of asphalt extender may vary from 0 30 percent and 30 that the temperature to which the filler material is heated ~ ~9'~J~3 may vary depending upon the particular product and the manu-facturer's specifications. The material is pumped into the bottorn opening 18 through the valve 20 until sufEicient material flows outwardly through the overflow pipe and the opening 16 to insure that the annular space has be,en completely filled. ~he material in the annular space is referred to generally by -the reference numeral 40 in Figure 2. The positioning of the filler material in the annular space not only causes the sleeve to be secured or adhered to lO the pipeline, when hardened, but also excludes the air and other corrosive materials from the annular space. The filler material hardens in approximately one hour and the hardened material has a Shore A hardness of about 35. After the filler material 40 has hardened, the nylon straps 28, 30, 32 and 34 are removed which results in the ~rrestor illustrated in Figure 7. It is recommended that the exposed exterior surface of the sleeve be hand taped to prevent corrosion.
The sleeve arrestor of this invention functions in substantially the same manner as the prior art to halt a ~O crack or fracture moving down the length of the pipeline.
The sleeve arrestor adheres to the exterior surface of the pipeline and longitudinal displacement of the arrestor is prevented should a crack or fracture occur. The filler material 40 prevents the very serious problem of corrosion of the interior of the sleeve and the exterior of the pipeline.
The fact that the sleeve 14 is substantially larger than the pipeline insures that the sleeve may be rapidly installed on the pipeline to eliminate any problems normally associated with dirnensional variations and out-of-roundness of the 30 pipeline.
` ~6~7~
Thus it can be seen that a novel crack arrestor has been described for a pipeline which accomplishes at least all of its stated objectives. The method described herein insures that the crack a.rrestor will be in a s-table condition and will positively prevent corrosion between the arrestor and the pipeline.
: -8-
Claims (9)
1. The method of installing a crack arrestor on a pipeline, comprising the steps of:
1) providing a cylindrical sleeve having an inner diameter greater than the outside diameter of the pipeline, said sleeve having at least one opening formed therein;
2) mounting the sleeve on the pipeline;
3) centering the sleeve with respect to the pipeline so that the annular space between the sleeve and the pipeline is substantially equal around the circumference of the pipeline;
4) sealing the space between ends of the sleeve and the pipeline;
5) injecting a curable filler material through the opening in the sleeve to fill the annular space between said sleeve and pipeline and to exclude air therefrom; and 6) allowing the filler material to cure to a resilient consistency.
1) providing a cylindrical sleeve having an inner diameter greater than the outside diameter of the pipeline, said sleeve having at least one opening formed therein;
2) mounting the sleeve on the pipeline;
3) centering the sleeve with respect to the pipeline so that the annular space between the sleeve and the pipeline is substantially equal around the circumference of the pipeline;
4) sealing the space between ends of the sleeve and the pipeline;
5) injecting a curable filler material through the opening in the sleeve to fill the annular space between said sleeve and pipeline and to exclude air therefrom; and 6) allowing the filler material to cure to a resilient consistency.
2. The method of claim 1 wherein the curable filler material comprises an elastomeric urethane material.
3. The method of claim 1 wherein the space between the ends of the sleeve and pipeline are sealed by wrapping a tape material around the ends of the sleeve and around the pipeline.
4. The method of claim 3 wherein a reinforcing material is wrapped around the tape material between steps 4) and 5) set forth in claim 1.
5. The method of claim 1 wherein the sleeve has upper and lower openings formed therein and wherein the filler material is injected, through the said lower opening, into the annular space.
6. The method of claim 5 wherein the filler material is injected into the annular space until the filler material flows outwardly from the said upper opening.
7. In combination, a pipeline comprised of a plurality of lengths of pipes, at least one crack arrestor mounted on the pipeline, said crack arrestor comprising a cylindrical sleeve mounted on the pipeline and having an inside diameter greater than the outside diameter of the pipe, said sleeve being substantially concentrically mounted on the pipe, and a filler material between said sleeve and pipe which adheres said sleeve to said pipe and which prevents corrosion of that portion of the said pipe which is embraced by the sleeve and which prevents corrosion of the interior surface of said sleeve.
8. The combination of claim 7 wherein said filler material comprises a curable elastomeric material.
9. The combination of claim 7 wherein said filler material is non-corrosive.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24156781A | 1981-03-09 | 1981-03-09 | |
| US241,567 | 1981-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1169790A true CA1169790A (en) | 1984-06-26 |
Family
ID=22911220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000397664A Expired CA1169790A (en) | 1981-03-09 | 1982-03-05 | Stabilized sleeve arrestor |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU8095882A (en) |
| CA (1) | CA1169790A (en) |
| DE (1) | DE3208452A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5518568A (en) * | 1992-09-09 | 1996-05-21 | Fawley; Norman C. | High tensile strength composite reinforcing bands and methods for making same |
| US5632307A (en) * | 1992-09-09 | 1997-05-27 | Clock Spring Company, L.P. | Methods for using a high tensile strength reinforcement to repair surface defects in a pipe |
| CN104033652A (en) * | 2014-06-05 | 2014-09-10 | 中国海洋石油总公司 | Buckle arrestor applicable to deepwater submarine pipeline |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4449852A (en) * | 1982-07-30 | 1984-05-22 | Shell Oil Company | Buckle arrestor |
| FR2795805B1 (en) * | 1999-07-02 | 2001-08-31 | Coflexip | LIMITING DEVICE FOR PROPAGATING DEFORMATION IN A DOUBLE WALL TUBE |
| FR2795807B1 (en) | 1999-07-02 | 2001-07-27 | Coflexip | DEVICE FOR LIMITING THE PROPAGATION OF A DEFORMATION IN A DOUBLE WALL TUBE |
| DE10009305A1 (en) | 2000-02-22 | 2001-09-06 | Mannesmann Ag | Steel pipe used for transport of fluids under high pressure, has outer corrosion-proof protective sheath including plastic layer and crack stopper zone formed by wrapping bandage made of fiber material, around pipe |
| FR2851635B1 (en) * | 2003-02-24 | 2006-06-30 | 3X Engineering | INSERT SLEEVE FOR REPAIRING A HIGH PRESSURE FLUID TRANSPORT PIPE |
| CN106402579A (en) * | 2015-01-29 | 2017-02-15 | 淮安信息职业技术学院 | Anti-cracking salt chemical equipment pipeline |
| CN110110386B (en) * | 2019-04-12 | 2023-08-22 | 中国石油天然气集团有限公司 | Design method of steel sleeve crack stopper for high-grade steel gas pipeline |
-
1982
- 1982-02-26 AU AU80958/82A patent/AU8095882A/en not_active Abandoned
- 1982-03-05 CA CA000397664A patent/CA1169790A/en not_active Expired
- 1982-03-09 DE DE19823208452 patent/DE3208452A1/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5518568A (en) * | 1992-09-09 | 1996-05-21 | Fawley; Norman C. | High tensile strength composite reinforcing bands and methods for making same |
| US5632307A (en) * | 1992-09-09 | 1997-05-27 | Clock Spring Company, L.P. | Methods for using a high tensile strength reinforcement to repair surface defects in a pipe |
| US5677046A (en) * | 1992-09-09 | 1997-10-14 | Clock Spring Company L.P. | High tensile strength composite reinforcing bands |
| US5683530A (en) * | 1992-09-09 | 1997-11-04 | Clock Spring Company, L.P. | Reinforcement methods utilizing high tensile strength composite bands |
| CN104033652A (en) * | 2014-06-05 | 2014-09-10 | 中国海洋石油总公司 | Buckle arrestor applicable to deepwater submarine pipeline |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3208452A1 (en) | 1983-01-20 |
| AU8095882A (en) | 1982-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |