CN104816070A - Austenitic stainless steel pipeline welding process - Google Patents

Austenitic stainless steel pipeline welding process Download PDF

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Publication number
CN104816070A
CN104816070A CN201510247616.3A CN201510247616A CN104816070A CN 104816070 A CN104816070 A CN 104816070A CN 201510247616 A CN201510247616 A CN 201510247616A CN 104816070 A CN104816070 A CN 104816070A
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CN
China
Prior art keywords
welding
argon
stainless steel
wire
pipeline
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.)
Pending
Application number
CN201510247616.3A
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Chinese (zh)
Inventor
陈哲
杨庆泽
温志刚
朱大喜
陆传航
王勇建
张锦宝
靳伟亮
李家伟
李晓鹏
王林昌
蔡新荣
闵祥军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Offshore Oil Corp CNOOC
Offshore Oil Engineering Co Ltd
Offshore Oil Engineering Qingdao Co Ltd
Original Assignee
China National Offshore Oil Corp CNOOC
Offshore Oil Engineering Co Ltd
Offshore Oil Engineering Qingdao Co Ltd
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 China National Offshore Oil Corp CNOOC, Offshore Oil Engineering Co Ltd, Offshore Oil Engineering Qingdao Co Ltd filed Critical China National Offshore Oil Corp CNOOC
Priority to CN201510247616.3A priority Critical patent/CN104816070A/en
Publication of CN104816070A publication Critical patent/CN104816070A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/02Seam welding; Backing means; Inserts
    • B23K9/028Seam welding; Backing means; Inserts for curved planar seams
    • B23K9/0282Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • B23K9/167Arc welding or cutting making use of shielding gas and of a non-consumable electrode
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/04Tubular or hollow articles
    • B23K2101/10Pipe-lines

Abstract

The invention provides an austenitic stainless steel pipeline welding process. The austenitic stainless steel pipeline welding process includes that welding grooves are pre-fabricated in ends of a to-be-welded pipeline; positioned welding is directly performed at roots of the grooves after assembling of the welding grooves; inside of the to-be-welded pipeline is subjected to argon-filled protection; positioned welded parts are directly fused into weld joints during bottom seal welding; argon-filled protection of a weld pass back side that is located inside the pipeline is stopped after hot pass welding is finished; filling and cover surface welding are finished; a welded part is checked; when stainless steel pipeline welding is achieved, back side argon filling is not required during positioned welding, the positioned welded parts are not required to be polished during bottom sealing, argon purity of the back side is gradually increased while bottom sealing is performed, weld joints of the roots are effectively protected so that oxidation is prevented during hot pass welding, decreasing of argon purity of the back side due to argon filling and polishing splash in the pipeline during assembling is avoided, the stainless steel pipeline welding time is shortened, welding qualities are excellent, polishing materials and protective gas are saved, the production efficiency is increased, and production costs are lowered.

Description

Austenitic stainless steel pipe wire-bonding technique
Technical field
The present invention relates to welding procedure, particularly relate to a kind of Austenitic stainless steel pipe wire-bonding technique.
Background technology
Austenitic stainless steel is most important steel grade in stainless steel, under high temperature, extremely low temperature (-196 DEG C), all have excellent plasticity and toughness, cold and hot working performance and decay resistance.In the process pipelines of Offshore Engineering and liquefied natural gas terminal module is built, often relate to the welding of 316 or 304 series austenitic stainless steel pipelines.Because stainless steel as easy as rolling off a log appearance when welding is oxidized thus affects weld seam decay resistance; welding for stainless steel pipeline needs exercise due diligence; particularly during back cover welding, tubular body needs applying argon gas protection to prevent root to be oxidized, strict to protective gas purity requirement.
For the spreading work of stainless steel pipeline, when group positions weldering to process, in order to prevent the oxidation of root, the processing method adopted in the industry at present has two kinds: one first carries out applying argon gas protection to pipeline inside, then weldering is positioned at root during group pair, be positioned at the welding bead back side argon filling of pipeline inside during this kind of mode requirement group pair, operation easier is comparatively large, consumes argon gas obvious; Another kind adopts bridging mode; weldering is positioned outside groove; this mode requires clean for tack welding polishing in back welding termination process; polishing takes time and effort; polishing is splashed serious for the purity of argon impact of pipeline inside; recover very consuming time etc. gas purity to be protected, if grinding process is improper, be also easier to occur defect.Special in Large Diameter Pipeline pipeline, current tack welding mode all can cause that welding job efficiency is lower and cost is higher.
On the basis for stainless traditional argon filling welding manner, international well-known wlding producer (as U.S. Lincoln and Benshen steel) all have developed stainless steel and exempts from argon filling welding material.Such welding material can when stainless steel back cover welds, and realize the back side and exempt from argon-filled protection, root color meets relevant criterion requirement.But after such wlding of employing completes back cover welding; because groove root thickness only has 3-4mm; the root pass back side does not have argon shield; carry out hot bead welding can unavoidablely impact groove root welding bead; such groove root there will be severe oxidation phenomenon, thus have impact on weld seam decay resistance.Requiring extremely strict stainless steel art pipeline for decay resistance, there is obvious limitation in this technique.
Summary of the invention
Main purpose of the present invention is the above-mentioned shortcoming overcoming existing product existence, and a kind of Austenitic stainless steel pipe wire-bonding technique is provided, it directly positions weldering in groove root, and without the need to the back side argon filling during tack welding, tack welding is removed without the need to polishing during back cover welding, and back side purity of argon can progressively improve in back welding termination process, during hot bead welding, back side argon shield effectively prevents root to be oxidized, thus pipeline internal argon-filling when can avoid group pair, realize large quantities of pipeline, pipe fitting concentrates efficient group right, the time waiting for that back cover front back side purity of argon is up to standard can be avoided again, also can avoid the problem of splashing and causing back side purity of argon to reduce of polishing, effective shortening stainless steel tube wire bonding time, the variable color of groove root weld seam is made to meet relevant criterion requirement, welding quality is good, save abrasive material and protective gas, enhance productivity, reduce production cost.
The object of the invention is to be realized by following technical scheme.
Austenitic stainless steel pipe wire-bonding technique of the present invention, is characterized in that, comprise the following steps:
The first step: at the prefabricated bevel for welding of line end to be welded;
Second step: directly position weldering in groove root after welding groove;
3rd step: argon-filled protection is carried out to pipeline inside to be welded;
4th step: carry out back cover welding, directly fuses into weld seam by tack welding during back cover welding;
5th step: carry out hot bead welding, after completing, stopping is to the argon-filled protection at the welding bead back side being positioned at pipeline inside;
6th step: complete filling cover welding;
7th step: weldment is tested.
Aforesaid Austenitic stainless steel pipe wire-bonding technique, wherein, described prefabricated bevel for welding is monolateral V-shaped or monolateral compound groove; The bottom angle of this groove is 55 to 65 degree, and root face is of a size of 1 to 2mm, and groove group is 2 to 4mm to gap.
Aforesaid Austenitic stainless steel pipe wire-bonding technique, wherein, the tack welding of described groove, back welding, hot bead weldering adopt Tig Welding.
Aforesaid Austenitic stainless steel pipe wire-bonding technique, is characterized in that, in described back welding termination process, pipeline argon gas inside purity progressively improves, and reaches requirement purity when carrying out hot bead welding.
Aforesaid Austenitic stainless steel pipe wire-bonding technique, wherein, the process conditions of described tack welding and back welding employing Tig Welding are, flux-cored wire model is used to be day Benshen steel TG-X316L or day Benshen steel TG-X308L, gage of wire is 2.2mm, and current range is 75 to 100A, and voltage is 10 to 12V, speed of welding is 35 to 70mm/min, protection-gas welding more than 99.99% purity argon; The process conditions of described hot bead weldering employing Tig Welding are, use welding wire model to be TGS-316L or TGS-308L, gage of wire is 2.0mm or 2.4mm, and when gage of wire is 2.0mm, current range is 80 to 120A, voltage is 10 to 13V, and speed of welding is 45 to 75mm/min; When gage of wire is 2.4mm, current range is 90 to 140A, and voltage is 11 to 14V, and speed of welding is 50 to 80mm/min, protection-gas welding more than 99.99% purity argon, stopping back side argon-filled protection after hot bead completes.
Aforesaid Austenitic stainless steel pipe wire-bonding technique, wherein, it is adopt the inner partial sealing mode of pipeline to carry out applying argon gas protection that described 3rd step carries out argon-filled protection to pipeline inside, and purity of argon is more than 99.99%.
Aforesaid Austenitic stainless steel pipe wire-bonding technique, wherein, described in complete hot bead after filling and cover welding adopt argon tungsten-arc welding, manual electric arc welding, medicine core gas shielded arc welding or Lincoln weld technique to complete.
Aforesaid Austenitic stainless steel pipe wire-bonding technique, wherein, described 7th step comprises weldment Interventions Requested:
(1) appearance test and NDT inspection, criterion of acceptability is: the requirement meeting welding standard ASME IX and ASMEB31.3.Root run variable color meets the requirement of AWS D18.2 class 6;
(2) mechanical property test, comprising: (A) tension test tensile strength is greater than the minimum of a value (515MPa) that mother metal material standard requires; B) bend test part by bent face flawless and other defect, meet the requirement of ASMEIX standard; C) low-temperature impact toughness, the test temperature of impact test is-196 DEG C, and lateral expansion numerical value meets specification requirement (lateral expansion value is greater than 0.38mm).D) macroscopic view and hardness test, weldment joint hardness meets NACE MR0175 and requires (maximum≤248HV10); Root of weld fusion is good, occurs without lack of penetration situation; E) ferrite number test, weldment joint ferrite number (2.0FN-9.0FN) requirement.
The beneficial effect of Austenitic stainless steel pipe wire-bonding technique of the present invention:
1) for Austenitic stainless steel pipe wire bonding, during group pair, directly position weldering in groove root, without the need to back side argon-filled protection, achieve large quantities of pipeline, the concentrated efficient group of pipe fitting is right;
2) for Austenitic stainless steel pipe wire bonding, avoid the stand-by period that back cover front back side purity of argon need reach standard-required, during back cover, directly tack welding is fused into weld seam, remove tack welding without the need to polishing;
3) eliminate tack welding polishing removing step, avoid the splashing of polishing tack welding and cause back side purity of argon to reduce.Greatly shorten the stainless steel tube wire bonding time, welding quality is good, and root variable color meets relevant criterion requirement.
4) save abrasive material and protective gas, enhance productivity, reduce production cost.
Detailed description of the invention
Embodiment one:
The stainless steel pipeline of ICHTHYS LNG project is welded, according to the welding procedure qualification test that welding standard ASME IX, ASMEB31.3 and ICHTHYS project specifications book completes.
Pipeline material is ASTM A358Gr.TP316/316L, and specification is OD:711.2mm, wall thickness 20.62mm, uses welding procedure of the present invention to carry out welding main operational steps as follows:
1, weld seam welds prepares operation:
1. prepare groove: to the prefabricated bevel for welding of line end to be welded, bevel for welding is monolateral V-shaped, and groove bottom angle is 60 degree, and it is 1-2mm that manual polishing completes root face; Stainless steel wire brush is adopted to clear up to the scope of groove and internal and external walls both sides 25mm.
2. selected welding material: welding wire adopts the TG-X316L welding wire of day Benshen steel, and diameter is φ 2.2mm; The TGS-316L welding wire of sky, Kunshan Thailand, diameter is φ 2.4mm.Fill capping and select other wldings corresponding according to maturation process.
2, organize right:
Adjustment root gap is 2mm, and adopt argon tungsten-arc welding to position weldering, the flux-cored wire model of use is TG-X316L; gage of wire is 2.2mm, and current range is 75 to 100A, and voltage is 10 to 12V; speed of welding is 35 to 70mm/min, protection-gas welding more than 99.99% purity argon.Tack welding, without the need to back side argon-filled protection, requires that tack welding weld seam both sides are level and smooth, so that fusion during back cover.
3, argon-filled protection is carried out to pipeline inside:
By partial sealing mode, carry out applying argon gas protection in pipe inside, adopt protection gas purity of argon 99.99%.
4, back cover welding:
Adopt Tig Welding.The welding wire model used is TG-X316L, and gage of wire is 2.2mm, and current range is 75 to 100A, and voltage is 10 to 12V, and speed of welding is 35 to 70mm/min, protection-gas welding more than 99.99% purity argon; During back cover welding, tack welding is directly fused into welding bead.To the welding bead back filled argon protection being positioned at pipeline inside in back cover process, purity of argon can progressively improve, to gas purity without strict demand.
5, hot bead welding:
Require before hot bead starts that pipeline argon gas inside purity reaches more than 99.95%, weld to prevent hot bead and cause root backside oxide.Hot bead welding adopts Tig Welding, and the welding wire model of use is TGS-316L, and gage of wire is 2.4mm, and current range is 90 to 140A, and voltage is 11 to 14V, and speed of welding is 50 to 80mm/min, protection-gas welding more than 99.99% purity argon.Pipeline internal argon-filling is stopped to protect after completing hot weld seam.
6, the filling after hot bead and cover welding: adopt traditional-handwork arc welding to complete residue welding.
Welding condition in the present embodiment is shown in Table 1, and during tack welding, welding parameter should suitably to form level and smooth weld seam, and hot input control is within 1.7KJ/mm.
The content be not described in the present embodiment is prior art, therefore no longer repeats.
7, soldering test part inspection, assay is as follows:
(1) appearance test and NDT inspection: it is completely qualified that this engineer testing part appearance test and NDT check, and meets the requirement of welding standard ASME IX and ASME B31.3.Root run variable color meets the requirement of AWS D18.2 class 6.
(2) mechanical property test: A, tension test.Tension test tensile strength is all greater than the minimum of a value (515MPa) that this material standard requires, tension test is qualified, as shown in table 2.B, bend test.Bend test part by bent face flawless and other defect, meet the requirement of ASME IX standard, bend test is qualified, as shown in table 3.C, low-temperature impact toughness are tested.The test temperature of impact test is-196 DEG C, impacts the requirement (lateral expansion value is greater than 0.38mm) that numerical value all meets specifications, as shown in table 4.D, macroscopic view and hardness test.Weldment joint hardness meets NACE MR0175 and requires (maximum≤248HV10).Root of weld fusion is good, occurs without lack of penetration situation, as shown in table 5.E, ferrite number are tested.The requirement (2.0FN-9.0FN) of weldment joint ferrite number book up to specification, as shown in table 6.
Table 1 the present embodiment welding condition
Table 2 the present embodiment stretch test result
Table 3 the present embodiment bend test result
Table 4 the present embodiment low-temperature flexibility result of the test (-196 DEG C)
Table 5 the present embodiment hardness test result (HV10)
Table 6 the present embodiment ferrite number result of the test (FN)
The advantage of Austenitic stainless steel pipe line tack welding welding procedure of the present invention is: without the need to the back side (pipe is inner) argon filling during tack welding, tack welding is removed without the need to polishing during back welding, in back welding process, back side purity of argon progressively improves, during hot bead, back side argon shield can effectively prevent root to be oxidized, both avoided managing interior argon filling during group pair, realize large quantities of pipeline, pipe fitting concentrates efficient group right, avoid again back welding front back side purity of argon need reach the stand-by period of standard-required, polishing splashing is also avoided to cause back side purity of argon to reduce, shorten the stainless steel tube wire bonding time, the variable color of groove root weld seam is made to meet relevant criterion requirement, welding quality is good, save abrasive material and protective gas, enhance productivity, reduce production cost.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (8)

1. an Austenitic stainless steel pipe wire-bonding technique, is characterized in that, comprises the following steps:
The first step: at the prefabricated bevel for welding of line end to be welded;
Second step: directly position weldering in groove root after welding groove;
3rd step: argon-filled protection is carried out to pipeline inside to be welded;
4th step: carry out back cover welding, directly fuses into weld seam by tack welding during back cover welding;
5th step: carry out hot bead welding, after completing, stopping is to the argon-filled protection at the welding bead back side being positioned at pipeline inside;
6th step: complete filling cover welding;
7th step: weldment is tested.
2. Austenitic stainless steel pipe wire-bonding technique according to claim 1, is characterized in that, described prefabricated bevel for welding is monolateral V-shaped or monolateral compound groove; The bottom angle of this groove is 55 to 65 degree, and root face is of a size of 1 to 2mm, and groove group is 2 to 4mm to gap.
3. Austenitic stainless steel pipe wire-bonding technique according to claim 1, is characterized in that, the tack welding of described groove, back welding, hot bead weldering adopt Tig Welding.
4. Austenitic stainless steel pipe wire-bonding technique according to claim 1, is characterized in that, in described back welding termination process, pipeline argon gas inside purity progressively improves, and reaches requirement purity when carrying out hot bead welding.
5. Austenitic stainless steel pipe wire-bonding technique according to claim 3, it is characterized in that, the process conditions of described tack welding and back welding employing Tig Welding are, flux-cored wire model is used to be day Benshen steel TG-X316L or day Benshen steel TG-X308L, gage of wire is 2.2mm, and current range is 75 to 100A, and voltage is 10 to 12V, speed of welding is 35 to 70mm/min, protection-gas welding more than 99.99% purity argon; The process conditions of described hot bead weldering employing Tig Welding are, use welding wire model to be TGS-316L or TGS-308L, gage of wire is 2.0mm or 2.4mm, and when gage of wire is 2.0mm, current range is 80 to 120A, voltage is 10 to 13V, and speed of welding is 45 to 75mm/min; When gage of wire is 2.4mm, current range is 90 to 140A, and voltage is 11 to 14V, and speed of welding is 50 to 80mm/min, protection-gas welding more than 99.99% purity argon, stopping back side argon-filled protection after hot bead completes.
6. Austenitic stainless steel pipe wire-bonding technique according to claim 1, is characterized in that, it is adopt the inner partial sealing mode of pipeline to carry out applying argon gas protection that described 3rd step carries out argon-filled protection to pipeline inside, and purity of argon is more than 99.99%.
7. Austenitic stainless steel pipe wire-bonding technique according to claim 1, is characterized in that, described in complete hot bead after filling and cover welding adopt argon tungsten-arc welding, manual electric arc welding, medicine core gas shielded arc welding or Lincoln weld technique to complete.
8. Austenitic stainless steel pipe wire-bonding technique according to claim 1, is characterized in that, described 7th step comprises weldment Interventions Requested:
(1) appearance test and NDT inspection, criterion of acceptability is: the requirement meeting welding standard ASME IX and ASMEB31.3.Root run variable color meets the requirement of AWS D18.2 class 6;
(2) mechanical property test, comprising: (A) tension test tensile strength is greater than the minimum of a value that mother metal material standard requires; B) bend test part by bent face flawless and other defect, meet the requirement of ASME IX standard; C) low-temperature impact toughness, the test temperature of impact test is-196 DEG C, and lateral expansion numerical value meets specification requirement; D) macroscopic view and hardness test, weldment joint hardness meets NACE MR0175 requirement; Root of weld fusion is good, occurs without lack of penetration situation; E) ferrite number test, the requirement of weldment joint ferrite number.
CN201510247616.3A 2015-05-15 2015-05-15 Austenitic stainless steel pipeline welding process Pending CN104816070A (en)

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Cited By (7)

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CN105772971A (en) * 2016-04-28 2016-07-20 西南石油大学 Welding technology of high sour gas field conveying pipeline
CN105817749A (en) * 2016-05-27 2016-08-03 中国海洋石油总公司 Automatic tungsten inert gas (TIG) argon arc welding process for stainless steel pipelines
CN107052535A (en) * 2017-03-16 2017-08-18 中国核电工程有限公司 Two kinds of different austenite stainless steel welding methods
CN108480822A (en) * 2018-04-27 2018-09-04 江苏恒加机械工程有限公司 A kind of metal alloy piece welding method
CN108705183A (en) * 2018-07-18 2018-10-26 苏州瑞沁精密机械有限公司 A kind of metal transfer welding method
CN108746934A (en) * 2018-07-03 2018-11-06 四川石油天然气建设工程有限责任公司 A kind of natural gas transmission method for welding pipeline
CN109202230A (en) * 2018-11-12 2019-01-15 美钻深海能源科技研发(上海)有限公司 A kind of welding technique of welded flange and petroleum pipeline

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105772971A (en) * 2016-04-28 2016-07-20 西南石油大学 Welding technology of high sour gas field conveying pipeline
CN105817749A (en) * 2016-05-27 2016-08-03 中国海洋石油总公司 Automatic tungsten inert gas (TIG) argon arc welding process for stainless steel pipelines
CN107052535A (en) * 2017-03-16 2017-08-18 中国核电工程有限公司 Two kinds of different austenite stainless steel welding methods
CN107052535B (en) * 2017-03-16 2021-12-03 中国核电工程有限公司 Welding method for two different austenitic stainless steels
CN108480822A (en) * 2018-04-27 2018-09-04 江苏恒加机械工程有限公司 A kind of metal alloy piece welding method
CN108746934A (en) * 2018-07-03 2018-11-06 四川石油天然气建设工程有限责任公司 A kind of natural gas transmission method for welding pipeline
CN108705183A (en) * 2018-07-18 2018-10-26 苏州瑞沁精密机械有限公司 A kind of metal transfer welding method
CN109202230A (en) * 2018-11-12 2019-01-15 美钻深海能源科技研发(上海)有限公司 A kind of welding technique of welded flange and petroleum pipeline

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