CN102261564B - Method for arresting ductile fracture of natural gas pipeline - Google Patents
Method for arresting ductile fracture of natural gas pipeline Download PDFInfo
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- CN102261564B CN102261564B CN 201010193386 CN201010193386A CN102261564B CN 102261564 B CN102261564 B CN 102261564B CN 201010193386 CN201010193386 CN 201010193386 CN 201010193386 A CN201010193386 A CN 201010193386A CN 102261564 B CN102261564 B CN 102261564B
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Abstract
The invention relates to a method for arresting ductile fracture of natural gas pipelines of level X100 and above, wherein two or more fracture arresting steel pipes, which are relatively low in strength level but relatively high in wall thickness and toughness, are connected among X100 or higher-level steel pipes at intervals of 50-100 steel pipes and by a length within a range of 600-1200 m; and the wall thickness of the fracture arresting steel pipe is calculated according to pressure bearing capacity the same as that of a main pipeline, while the toughness thereof is determined by a method recommended in Petroleum and Natural Gas Industries-Steel Pipe for Pipeline Transport System ISO 3183: 2007 and the appendix G of Pipeline Steel Pipe Standards (Version 44) API Spec5L: 2007. The manufacturing technical difficulty and the manufacturing cost of the fracture arresting steel pipe with low strength level and high toughness are low, and the toughness index thereof is easy to achieve, so that the safety requirements of the pipeline fracture arrest are met, and unification of safety and economical efficiency is realized.
Description
Technical field
The present invention relates to a kind of X100 and above rank method for arresting ductile fracture of natural gas pipeline thereof.
Background technique
In order to improve the Economy of pipeline transport, the development trend of natural gas line is high pressure, heavy caliber, large wall thickness, large throughput rate, and the steel pipe of employing is also thereupon to high grade of steel (high intensity levels) future development.In the world wide, the long distance gas pipeline of building at present generally adopts X70 and following other steel pipe of level thereof, and X80 rank steel pipe has begun extensive use, and the superhigh strength of higher level (X100, X120) steel pipe has also carried out examination and used.China's natural gas line pipe line steel pipe development in recent years is very fast, and X70 rank steel pipe such as send at the successful Application of pipework in transfering natural gas from the west to the east one line, two wires, capital, Shan, gas east, river, shortened China and world-class gap.The second west to east gas pipeline project pipework of building at present, other steel pipe of wide-scale adoption X80 level, more than the 2000 kilometer built ventilation in west section, more than 2,000 kilometer of eastern section also approaches completion, the comprehensive parameters such as its pressure, caliber, wall thickness, length also are beyond example in the world, make being applied in of the high Grade of China realize in the world leap from " follower-up " to " leader ".The successful Application of X80 level pipeline pipeline steel pipe has been mentioned on our agenda engineering application of X100 level pipeline pipeline steel pipe.Along with the raising of pipeline grade of steel, its application technology difficulty increases, and prevents that natural gas line ductility crackle long-range expansion (being crack arrest) is exactly wherein to need one of technical barrier that solves.
Along with the raising of pipe line steel material toughness, high pressure gas pipeline generally is the ductile fracture feature.Natural gas line is cracking in a single day, and its decompression rate is very slow, and the speed of steel pipe Crack Extension is very fast, in order to guarantee pipe safety, require steel pipe that enough toughness must be arranged, make the speed of Crack Extension less than the decompression velocity of pipeline, thereby realize the crack arrest of ductility crackle.But along with pipeline pressure and other raising of steel strength level, rely on tube material toughness to come the crack arrest difficulty increasing.Studies show that, pipeline for the X100 intensity rank, rely on the toughness that improves steel pipe can crack arrest in some cases (such as pressure, caliber, the wall thickness less of pipeline), and rely on the toughness of steel pipe can not crack arrest in some cases (pressure, caliber, wall thickness such as pipeline are relatively large), for the pipeline of X120 and above intensity rank thereof, the toughness of dependence steel pipe can not crack arrest.Steel pipe toughness can not crack arrest or the situation of reliable crack arrest under must take other the exterior measures to carry out crack arrest, the method that adopts at present is to add at a certain distance metal or nonmetal crack arrest ring in the outside of pipeline.This crack arrest method not only needs to use the crack arrest ring, increases the joint connection in site flow chart, and China's technology and experience of still not having at present the crack arrest ring to use, and world wide is used also not extensive.
Summary of the invention
The objective of the invention is to adopt the pipeline of X100 and above high intensity levels steel pipe thereof, every certain spacing, connect 2 or the many high tenacity crack arrest steel pipes that intensity rank is lower, improve the crack arrest ability of pipeline, prevent the expansion of pipeline long-range crackle, thereby guarantee the security of operation of pipeline.
High pressure gas pipeline will be in case cracking and long-range expansion will cause huge disaster and loss.Raising along with conduit running pressure, the raising of the increase of caliber, wall thickness and pipeline steel tube intensity rank, prevent that the required toughness of natural gas line ductility Crack Extension (being crack arrest) is more and more higher, and along with the raising of pipeline steel tube intensity rank, improve more and more difficulty of toughness, rely on the toughness of High Tensile Steel Tube itself to be difficult to effective crack arrest.
Be the steel pipe of normal X100 or other higher level between two groups of relatively low steel pipes of intensity rank, its spacing is 50～100 steel pipes, 600～1200 meters of length.According to concrete pipe safety requirement, this spacing can shorten or strengthen.A large amount of higher steel pipes of intensity rank that use, to its toughness too high requirement needn't be proposed, and a small amount of intensity rank that uses is relatively low, the steel pipe that wall thickness and toughness are higher, its wall thickness carries out designing and calculating by the bearing capacity identical with main pipe, its toughness can be determined by existing ripe computation model, empirical correlation or experimental result, its proposition be prevented the higher toughness requirement of ductility crackle crack arrest.
The relatively low steel pipe of intensity rank adopts spiral seam submerged-arc welding pipe or straight-line joint submerged arc welding tube.Adopt the spiral submerged arc welded welded tube, during two connecting tube circumferential weld welding counterparts, the spacing of two pipe end helix seam circumferential distances should be greater than 100mm; Or employing vertical masonry joint submerged arc welding welded tube, during two connecting tube circumferential weld welding counterparts, two pipe end vertical masonry joint circumferential distances should greater than 200mm or 1/3rd pipe girths, prevent that crackle is along continuous two steel pipe toughness relatively poor weld seam or the expansion of position, heat affected zone.
X80 and following intensity rank steel pipe thereof are widely applied in natural gas line, determining of its toughness is a mature technology, many computation models, empirical correlation and full-scale bursting test result in kind are arranged at present, and two standards of ISO 3183:2007 " industrial gas oil-pipe-line transportation system steel pipe " and API Spec 5L:2007 (the 44th edition) " pipeline steel tube standard " have recommend method to this.And X100 and above rank steel pipe thereof are not still widely applied at present, and its natural gas line steel pipe toughness how to confirm there is no mature technology and experience, and the toughness of dependence steel pipe itself can not crack arrest or reliable crack arrest.Effect of the present invention is constant at pipeline configuration, do not adopt other crack arrest ring structure, reduce crack arrest circulating application worker operation, only in the middle of the pipeline of normal intensity rank relatively high (X100 and above rank thereof), connect 2 or many intensity ranks relatively low (X80 and following), heavy wall, high ductility steel tube every a determining deviation.Adopt this invention technology can effectively solve the fracture arrest problem that X100 and higher level thereof be don't bother about the road, promote the commercial Application of superhigh strength level pipeline pipeline steel pipe.Even the pipeline that intensity rank is higher has certain crack arrest ability, adopt this technology also can further improve its crack arrest ability, thereby improve the safety reliability of pipeline.
Adopt this invention technology, for a large amount of relatively high X100 or the higher steel pipes of other rank of intensity rank that use of pipeline, do not propose too high toughness reguirements, reduce manufacturing technology difficulty and manufacture cost.For the relatively low steel pipe of the intensity rank of a small amount of use, for satisfying crack arrest characteristic higher toughness index is proposed, the manufacturing technology difficulty is little, and toughness index reaches easily, guarantees the safety requirement of pipeline crack arrest, thereby accomplishes the unification of Security and Economy.The low-intensity rank steel pipe that increases in the pipeline, for guaranteeing identical bearing capacity, the wall thickness of steel pipe increases, the circumference stress level reduces, the arrest toughness value of calculating by recommend method reduces, and that the toughness of low-intensity rank steel pipe can be done is higher, therefore, the crack arrest ability of pipeline is stronger, and conduit running is safer.
The pipe line steel that high pressure gas pipeline generally adopts the multielement microalloy to strengthen with steel pipe at present, Pcm is low for the weld crack sensitivity coefficient, and weldability is good, and the Site Welding of low-intensity, heavy wall, high ductility steel tube and normal High Tensile Steel Tube does not have technical difficulty.
Embodiment
Embodiment 1
Be 10MPa for pressure, external diameter is the natural-gas transfer pipeline of φ 1016, adopts 0.72 design ratio, and it is the X100 steel pipe of 10.2mm that normal piping design adopts thickness.In order to guarantee or improve the crack arrest characteristic of pipeline, every the X70 steel pipe of 2 same outer diameter as of 50 X100 pipes (every steel pipe is about 12 meters) connection, its wall thickness is 14.6mm.For the X100 pipeline steel tube, do not propose too high toughness, as require the Charpy-V impact power requirement to get final product more than or equal to 120J.Toughness for 2 X70 steel pipes, press the Battelle Hyperbola Determinate Method that ISO 3183:2007 " industrial gas oil-pipe-line transportation system steel pipe " or API Spec 5L:2007 (the 44th edition) " pipeline steel tube standard " recommend, consider full-scale explosion experimental data base result in kind, and consider the impact of makings condition and other factors, definite Charpy-V impact power requires more than or equal to 180J.
Embodiment 2
Be 12MPa for pressure, external diameter is the natural gas line of φ 1219, adopts 0.72 design ratio, and it is the X120 steel pipe of 12.2mm that normal piping design adopts thickness.In order to guarantee or improve the crack arrest ability of pipeline, every the X80 steel pipe of 3 same outer diameter as of 80 X120 pipes (every steel pipe is about 12 meters) connection, its wall thickness is 18.4mm.For the X120 pipeline steel tube, require the Charpy-V impact power requirement to get final product more than or equal to 150J.Toughness for 3 X80 steel pipes, press the Battelle Hyperbola Determinate Method that ISO3183:2007 " industrial gas oil-pipe-line transportation system steel pipe " and API Spec 5L:2007 (the 44th edition) " pipeline steel tube standard " recommend, consider full-scale explosion experimental data base result in kind, and consider the impact of makings condition and other factors, definite Charpy-V impact power requires more than or equal to 220J.
Claims (1)
1. method for arresting ductile fracture of natural gas pipeline is characterized in that:
(1) to adopting X100 and other natural gas line of higher level thereof, in the middle of the steel pipe of X100 or higher level, every 50 ~ 100 steel pipe spacings, length is 600 ~ 1200 meters, the join strength rank is relatively low, and the relatively high crack arrest steel pipe more than two or two of wall thickness and toughness, its wall thickness calculates by the bearing capacity identical with main pipe, and its toughness is pressed ISO3183:2007 " industrial gas oil-pipe-line transportation system steel pipe " or API Spec 5L:2007(the 44th edition) " pipeline steel tube standard " appendix G method of recommending determines;
(2) (1) described intensity rank is relatively low, and the relatively high crack arrest steel pipe more than two or two of wall thickness and toughness adopts spiral seam submerged-arc welding pipe or straight-line joint submerged arc welding tube;
Adopt spiral seam submerged-arc welding pipe, during two connecting tube circumferential weld welding counterparts, two pipe end helix seam circumferential distances are greater than 100mm; Or the employing straight-line joint submerged arc welding tube, during two connecting tube circumferential weld welding counterparts, two pipe end vertical masonry joint circumferential distances are greater than 200mm or 1/3rd pipe girths.
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| CN 201010193386 CN102261564B (en) | 2010-05-27 | 2010-05-27 | Method for arresting ductile fracture of natural gas pipeline |
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| CN 201010193386 CN102261564B (en) | 2010-05-27 | 2010-05-27 | Method for arresting ductile fracture of natural gas pipeline |
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| CN102261564A CN102261564A (en) | 2011-11-30 |
| CN102261564B true CN102261564B (en) | 2013-04-24 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104500975B (en) * | 2014-11-11 | 2017-05-10 | 中国石油天然气集团公司 | Fracture controllable natural gas pipeline and ductile fracture control method thereof |
| CN104462828A (en) * | 2014-12-11 | 2015-03-25 | 中国石油天然气集团公司 | High-pressure gas pipeline crack-prevention prediction method |
| CN108561678A (en) * | 2018-03-13 | 2018-09-21 | 中国石油天然气集团有限公司 | A kind of composite bimetal pipe entirety crack arrester of the internal layer containing crackle |
Citations (2)
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| CN1082162A (en) * | 1993-03-11 | 1994-02-16 | 浙江大学 | The pressure cylinder pasting board adds wrapping wire explosion-suppressing method and device |
| DE10350279A1 (en) * | 2003-10-25 | 2005-05-25 | Eisen- Und Metallwerke Ferndorf Gmbh | Process to test and modify the characteristics of a steel pipe subsequently used for the surface or sub-surface transmission of flammable gases |
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- 2010-05-27 CN CN 201010193386 patent/CN102261564B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082162A (en) * | 1993-03-11 | 1994-02-16 | 浙江大学 | The pressure cylinder pasting board adds wrapping wire explosion-suppressing method and device |
| DE10350279A1 (en) * | 2003-10-25 | 2005-05-25 | Eisen- Und Metallwerke Ferndorf Gmbh | Process to test and modify the characteristics of a steel pipe subsequently used for the surface or sub-surface transmission of flammable gases |
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| 王仪康等.高性能输送管线钢（续）.《焊管》.2007,第30卷(第2期), * |
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