CN1654149A - Technique of covering, sealing and welding under pressure for combustion gas pipeline - Google Patents
Technique of covering, sealing and welding under pressure for combustion gas pipeline Download PDFInfo
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- CN1654149A CN1654149A CN 200510009781 CN200510009781A CN1654149A CN 1654149 A CN1654149 A CN 1654149A CN 200510009781 CN200510009781 CN 200510009781 CN 200510009781 A CN200510009781 A CN 200510009781A CN 1654149 A CN1654149 A CN 1654149A
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Abstract
The present invention relates to fuel gas welding technology, and is especially the technological process of sleeving, welding and sealing pressure fuel gas pipeline. The technological process includes fixing mother material with fixture and fixing the fixture with screws, aligning the glue injecting hole to the leaking hole or crack in the mother material, injecting glue with high pressure injecting gun to the hole or crack, sealing the hole or crack with nut, fixing sandwiched jacket on the mother material, pile welding between the mother material and the jacket to form two linear welding seams on the mother, fusing the welded part and mother material in controlled welding speed and energy, polishing and cleaning to expose bright metal.
Description
Technical field: the present invention relates to the gas pipeline solder technology, be specially a kind of technique of covering, sealing and welding under pressure for combustion gas pipeline.
Background technology: at present, the maintenance of speedily carrying out rescue work under China's coal gas is not stopped the supple of gas or steam defeated situation can only be taked the other defeated method of shutoff.This method is long in time limit, cost height, wasting manpower and material resources, the danger of breaking out of fire at any time, blast and human casualty accident in addition.
Summary of the invention: the object of the present invention is to provide a kind of simple in structure, with low cost, safe and reliable, easy to use, technique of covering, sealing and welding under pressure for combustion gas pipeline of using manpower and material resources sparingly.The object of the present invention is achieved like this: by jig (4) mother metal (1) is entangled, bolt (6) holding clamp (4), make leakage hole or crack (7) on hole for injecting glue (3) the aligning mother metal (1) on the jig (4), aim at hole for injecting glue (3) injecting glue with the high-pressure injection rifle, behind the injecting glue, with nut hole for injecting glue (3) is shut, chuck (2) is enclosed within on the mother metal (1), chuck (2) groove (8) angle [alpha] is 20---30 °, go up and chuck (2) carries out linear bead weld I and II at mother metal (1), speed of welding is controlled at 0.4cm/S, weld heat input is controlled at 4KJ/cm, the linear welding bead of going up built-up welding at mother metal (1) does not fuse with weldment earlier, treat mother metal (1) upward intact two I of built-up welding and the linear welding bead of II, every high 2mm of welding bead, wide by 4---after the 5mm, use 110 again---the welding rod of 130A electric current and φ 3.2mm, welding bead fusion III and IV with weldment and mother metal (1) built-up welding, speed of welding is controlled at 2mm/S, and weld heat input is controlled at 13KJ/cm, align mutually, be adjacent to cooperation, in the 20mm scope of pipeline welding place both sides, metallic luster is exposed in the polishing cleaning.Advantage of the present invention is: simple in structure, with low cost, safe and reliable, easy construction, uses manpower and material resources sparingly, and can breaking out of fire, the danger of blast and human casualty accident.
Description of drawings: Fig. 1 looks schematic diagram for jig of the present invention and mother metal syndeton principle master; Fig. 2 is a jig structural principle schematic diagram of the present invention; Fig. 3 is chuck of the present invention and mother metal welding built-up welding catenation principle schematic diagram.
The specific embodiment: mother metal (1) is entangled by jig (4), bolt (6) holding clamp (4), make leakage hole or crack (7) on hole for injecting glue (3) the aligning mother metal (1) on the jig (4), aim at hole for injecting glue (3) injecting glue with the high-pressure injection rifle, behind the injecting glue, with nut hole for injecting glue (3) is shut, chuck (2) is enclosed within on the mother metal (1), chuck (2) groove (8) angle [alpha] is 20---30 °, go up and chuck (2) carries out linear bead weld I and II at mother metal (1), speed of welding is controlled at 0.4cm/S, and weld heat input is controlled at 4KJ/cm, the linear welding bead of going up built-up welding at mother metal (1) does not fuse with weldment earlier, treat mother metal (1) upward intact two I of built-up welding and the linear welding bead of II, every high 2mm of welding bead, wide by 4---after the 5mm, use 110 again---the welding rod of 130A electric current and φ 3.2mm, with the welding bead of weldment and mother metal (1) built-up welding fusion III and
IV, speed of welding is controlled at 2mm/S, and weld heat input is controlled at 13KJ/cm, align mutually, is adjacent to cooperation, and in the 20mm scope of pipeline welding place both sides, metallic luster is exposed in the polishing cleaning.
A, welding rod are selected basic electrode for use; Welding method: at first use 85---90A electric current and φ 2.5mm welding rod carry out the high 2mm of every welding bead of twice linear bead weld on mother metal (1), wide by 4---5mm, speed of welding is 4mm/s, heat input is controlled at 4KJ/cm, the linear welding bead of going up built-up welding at mother metal (1) earlier with the weldment fusion, treat that two linear welding bead built-up welding are intact after, use 110 again---electric current and the φ 3.2mm welding rod of 130A fuse weldment and mother metal (1), speed of welding is controlled at 2mm/s, and weld heat input is controlled at 13KJ/cm; Adopt the method for jig injecting glue to stop gas leakage; The method of b, jig (4) injecting glue is: the first step: with the leakage blocking sealants high-pressure injection rifle of packing into, be connected and installed hydraulic hand-pump and high-pressure injection rifle, second step: jig (4) is installed.Jig (4) material can be selected 20# for use---and 45# steel, geometry are according to leakage point place pipeline, and the equipment type shape designs, and for main or elbow generation gas leak, the injection hole count of jig is:
| Jig arc length (mm) | ??＜50 | ??50-100 | ??100-150 | ??150-200 | ??250-300 |
| The injection hole count | ??1--2 | ??2--3 | ??2--4 | ??3--5 | ??4--6 |
If arc length increases, hole count continues to increase, and the spacing of Kong Yukong is less than surpassing 60mm, the 3rd step: injecting glue ends gas, after jig (4) is installed, the high-pressure injection rifle is connected with the jig syringe bore, starts hydraulic hand-pump then, utilize the pressure of hydraulic pump, sealant is injected jig (4) and pipeline space, block perforation or cracks gas leak with glue, injecting glue connects the hole injecting glue successively, behind the injecting glue, hole for injecting glue (3) is shut with nut.Hydraulic hand-pump and high-pressure injection rifle can bear pressure 70MPa, but shutoff pressure 1---the preparation and the cleaning of 35MPa groove: size prepares cage plate on request, material A
3, thickness 7mm, the cage plate bevel angle is 20---30 °, root face 3mm, the joint group to and cleaning: assembling will align during cage plate mutually on pipeline, is adjacent to cooperation, and in the 20mm scope of pipeline welding place both sides, metallic luster is exposed in the polishing cleaning,
1. welding method at first uses 85---90A electric current and φ 2.5mm welding rod, at the enterprising line linearity built-up welding of mother metal (1) (seeing I II among Fig. 3), speed of welding is controlled at 0.4cm/S, weld heat input is controlled at 4KJ/cm, the linear welding bead of going up built-up welding at mother metal (1) does not fuse with weldment earlier, treat upward intact two linear welding bead (every high 2mm of welding bead of built-up welding of mother metal (1), wide by 4---5mm) after, 2. use 110 again---the welding rod of 130A electric current and φ 3.2mm, welding bead fusion (seeing IIIIV among Fig. 3) with weldment and mother metal built-up welding, speed of welding is controlled at 2mm/S, and weld heat input is controlled at 13KJ/cm.
The embodiment of the invention: electric welding machine is selected AXI165 type dc welding machine for use; Welding rod is selected basic electrode for use; Welding method: at first use 85---90A electric current and φ 2.5mm welding rod on mother metal, carry out twice linear bead weld (every high 2mm of welding bead, wide by 4---5mm), speed of welding is 4mm/s, and heat input is controlled at
4KJ/cm。The linear welding bead of built-up welding does not fuse with weldment earlier on mother metal.After treating that two linear welding bead built-up welding are intact, using 110 again---electric current and the φ 3.2mm welding rod of 130A fuse weldment and mother metal.Speed of welding is controlled at 2mm/s, and weld heat input is controlled at 13KJ/cm, thereby realizes that the pressure welding of gas pipeline safety belt connects.Connect technology with this band pressure welding, φ 630 * 7 low-carbon (LC) A
3Steel conduit can be depressed safe welding at the 1.20MPa pipe; φ 630 * 10 elbows can be pressed the safety welding at the 1.80MPa pipe.
1, the jig injecting glue ends gas
Before covering, sealing and welding, at first to stop gas leakage.Can adopt the method for jig injecting glue to stop gas leakage.The method of jig injecting glue is:
A, select equipment for use: hydraulic hand-pump, high-pressure injection rifle, jig.
B, leakage blocking sealants: adopt curing type, the thermojunction type all can.Technical performance index requires at normal temperatures, and compressive resistance is greater than 4MPa, and hardening time, anti-coal gas corroded less than 1 hour.
C, method of operating; Divide three steps:
The first step:, be connected and installed hydraulic hand-pump and high-pressure injection rifle with the leakage blocking sealants high-pressure injection rifle of packing into.
Second step: jig is installed.The jig material can be selected 20# for use---and 45# steel, geometry are according to leakage point place pipeline, and the equipment type shape designs.For main or elbow generation gas leak.The injection hole count of jig is followed following principle:
| Jig arc length (mm) | ??＜50 | ??50-100 | ??100-150 | ??150-200 | ??250-300 |
| The injection hole count | ??1--2 | ??2--3 | ??2--4 | ??3--5 | ??4--6 |
If arc length increases, hole count continues to increase, and the spacing of Kong Yukong does not surpass 60mm.The 3rd step: injecting glue ends gas.After jig is installed, the high-pressure injection rifle is connected with the jig syringe bore, starts hydraulic hand-pump then, utilize the pressure of hydraulic pump, sealant is injected jig and pipeline space, block perforation or cracks gas leak with glue.Injecting glue will connect the hole for injecting glue injecting glue successively.Behind the injecting glue, with nut hole for injecting glue is shut, hydraulic hand-pump and high-pressure injection rifle can bear pressure 70MPa, but shutoff pressure 1---35MPa.
2, band is pressed covering, sealing and welding
Treat that the jig injecting glue ends after the gas, promptly available band is pressed the covering, sealing and welding technology, the gas leakage pipeline section is added the sleeve pipe welding shut.Method is as described below.
(1) prepares before the weldering
The preparation of groove and cleaning: size prepares cage plate on request, material A
3, thickness 7mm, cage plate
Bevel angle is 20---30o, root face 3mm.The joint group is to reaching cleaning: assembling cover on pipeline
During plate, align mutually, be adjacent to cooperation, in the 20mm scope of pipeline welding place both sides, metallic luster is exposed in the polishing cleaning.
(2) welding condition is selected
Electric welding machine: dc welding machine;
Welding rod: basic electrode, φ 2.5mm, φ 3.2mm.
Welding current: 80---90A, 110---130A.
Arc voltage: 20---25V.
Speed of welding: 0.4cm/s, 0.2cm/s, the welding number of plies: 4 layers.
Weld heat input:
Be controlled at:
φ2.5mm，4KJ/cm；φ3.2mm，13KJ/cm。
350 ℃ of welding rod bake out temperatures---400 ℃, drying time: 1.5---2 hours.
Should put in the heat-preservation cylinder after the on-the-spot welding electrode oven dry and deposit.
(3) welding method
1. at first use 85---90A electric current and φ 2.5mm welding rod, at the enterprising line linearity built-up welding of mother metal (seeing I II among Fig. 3), speed of welding is controlled at 0.4cm/S, and weld heat input is controlled at 4KJ/cm.The linear welding bead of built-up welding does not fuse with weldment earlier on mother metal.Treat on the mother metal intact two the linear welding beads of built-up welding (every high 2mm of welding bead, wide by 4---5mm) after, 2. use 110 again---the welding rod of 130A electric current and φ 3.2mm fuses (seeing III IV among Fig. 3) with the welding bead of weldment and mother metal built-up welding.Speed of welding is controlled at 2mm/S, and weld heat input is controlled at 13KJ/cm.Be illustrated as follows:
Press covering, sealing and welding breathing out according to the heavy corrosion pipeline section of coal gas long-distance transport pipes and have the crackle elbow to carry out everywhere band.The pipeline operating pressure was 1.30 at that time---and 1.50MPa, realized the maintenance of speedily carrying out rescue work under the gas transmission situation of not stopping the supple of gas or steam.
Direct economic benefit of the present invention (1) is used this technology and is compared with former technology (shutoff is other defeated).Ftracture according to coal gas long-distance transport pipes roach gram figure station departures elbow in the Kazakhstan.Because roach gram figure station is nearer from regions in Harbin City, must not stop the maintenance of speedily carrying out rescue work under the gas transmission situation.Entrusted the maintenance of speedily carrying out rescue work of Harbin technology of gas pipeline company at that time.Harbin technology of gas pipeline company takes the method for the other defeated pressure release repair welding of shutoff, and 20 days durations, engineering is settled accounts 490,000 yuan (seeing the engineering clearing) wherein, 360,000 yuan of flat costs, 130,000 yuan of overhead costs.Technology company of pipeline office of country quotation: 550,000 yuan of the other defeated place's construction costs of shutoff.
Engineering cost of the present invention: place's band presses the covering, sealing and welding cost calculation as follows: (containing jig injecting glue cost)
A, labour cost: 5000 yuan
B, fee of material: 25000 yuan of end socket sleeve pipes: 20000 yuan of jigs: 2000 yuan of glue: 3000 yuan (40 the pipe, 70 yuan/pipe) consumable material: 2000 yuan (diesel oil, welding rod, grinding wheel etc.)
C, mechanical expense: 3200 yuan, generator (2): 1000 yuan, electric welding machine (2): 600 yuan of automobiles (2): 600 yuan of cranes (): 500 yuan of small machines: 500 yuan (have grinding abrasive disk, colloid-injecting gun, hydraulic pump, jin do not fall, pipe clamping device)
D, other: 2800 yuan amount to: 36000 yuan
Band is pressed two days covering, sealing and welding durations.Wherein earth work is one day, soldering and sealing engineering one day.
Reduce cost:
Band is pressed covering, sealing and welding and other defeated the comparing of shutoff, obviously has the duration weak point, the clear superiority that cost is low.The volume of reducing cost of the maintenance engineering of speedily carrying out rescue work reaches 450,000 yuan.
(2) take the pressure release repair welding maintenance technique of speedily carrying out rescue work, want emission coal gas 30 ten thousand steres at every turn.Gasification plant will be sent 30 ten thousand stere coal gas into torch and burns for switching flow process, presses 1.0 yuan/Nm3 of domestic gas price and calculates, and can save the coal gas loss and be worth 600,000 yuan.
2, indirect economic effect
This technology can guarantee the maintenance of speedily carrying out rescue work under the situation that does not stop gas transmission.If do not take this technology, because the other defeated construction of the shutoff amount of dispatching is big, long in time limit, take place for fear of accident, can only the pressure release repair welding, certainly will cause comprehensively stopping the supple of gas or steam of regions in Harbin City, 4,000 industry merchants take the family just will stop doing business.It is estimated that five one thousand families industry merchant takes the one day loss from suspension in family above 40,000,000 yuan.If stop the supple of gas or steam during exhibition of ice lanterns and ice carvings, loss from suspension was above hundred million yuan in one day.There are 118 families the Harbin City, 1,270,000 square metres of heating areas with the user who breathes out according to coal gas heating now.If stop one day air feed winter, 1,270,000 square metres heating facility will be all freezing, and the hotel will can't do business for a long time, and economic loss more can't be estimated.
After testing, breathe out the position of being badly in need of studying for a second time courses one has flunked according to coal gas long-distance transport pipes defectiveness 26 places are arranged.Therefore, this technology can be created direct economic benefit more than 1,100 ten thousand to 1,500 ten thousand yuan, and 4,000 ten thousand yuan of indirect economic effects are to more than one hundred million units.
Claims (1)
1, a kind of technique of covering, sealing and welding under pressure for combustion gas pipeline, it is characterized in that: mother metal (1) is entangled by jig (4), bolt (6) holding clamp (4), make leakage hole or crack (7) on hole for injecting glue (3) the aligning mother metal (1) on the jig (4), aim at hole for injecting glue (3) injecting glue with the high-pressure injection rifle, behind the injecting glue, with nut hole for injecting glue (3) is shut, chuck (2) is enclosed within on the mother metal (1), chuck (2) groove (8) angle [alpha] is 20-30 °, go up and chuck (2) carries out linear bead weld I and II at mother metal (1), speed of welding is controlled at 0.4cm/S, weld heat input is controlled at 4KJ/cm, the linear welding bead of going up built-up welding at mother metal (1) does not fuse with weldment earlier, treat mother metal (1) upward intact two I of built-up welding and the linear welding bead of II, every high 2mm of welding bead, after the wide 4-5mm, use the welding rod of 110-130A electric current and φ 3.2mm again, with the welding bead fusion III and the IV of weldment and mother metal (1) built-up welding, speed of welding is controlled at 2mm/S, weld heat input is controlled at 13KJ/cm, to align mutually, be adjacent to cooperation, in the 20mm scope of pipeline welding place both sides, metallic luster is exposed in the polishing cleaning.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510009781 CN1285441C (en) | 2005-03-03 | 2005-03-03 | Technique of covering, sealing and welding under pressure for combustion gas pipeline |
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| CN 200510009781 CN1285441C (en) | 2005-03-03 | 2005-03-03 | Technique of covering, sealing and welding under pressure for combustion gas pipeline |
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| CN1654149A true CN1654149A (en) | 2005-08-17 |
| CN1285441C CN1285441C (en) | 2006-11-22 |
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Cited By (6)
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| CN104028909A (en) * | 2014-06-23 | 2014-09-10 | 济钢集团有限公司 | Under-pressure welding device and under-pressure welding method for leakage points of combustible gas pipes and containers |
| CN109623210A (en) * | 2018-12-29 | 2019-04-16 | 重庆鑫劲宏景机械有限公司 | Equipment is used in frame of motorcycle welding |
| CN110185883A (en) * | 2019-06-13 | 2019-08-30 | 安徽陶博士环保科技有限公司 | A kind of photochemical trapping device |
| CN111085819A (en) * | 2018-10-24 | 2020-05-01 | 中核核电运行管理有限公司 | Method for preparing neutron flux measuring tube power station on site |
| CN112338434A (en) * | 2020-09-27 | 2021-02-09 | 中国石油天然气集团有限公司 | Delayed-cracking-resistant high-strength B-type sleeve fillet welding method |
| CN116677928A (en) * | 2023-08-03 | 2023-09-01 | 苏芯物联技术(南京)有限公司 | Intelligent detection method for welding protection gas pipeline leakage |
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| CN101474703B (en) * | 2009-01-21 | 2011-04-06 | 东方锅炉（集团）股份有限公司 | Seal welding method of shell type heat exchanger pipe sheet stainless steel composite layer and carbon steel tube |
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2005
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104028909A (en) * | 2014-06-23 | 2014-09-10 | 济钢集团有限公司 | Under-pressure welding device and under-pressure welding method for leakage points of combustible gas pipes and containers |
| CN111085819A (en) * | 2018-10-24 | 2020-05-01 | 中核核电运行管理有限公司 | Method for preparing neutron flux measuring tube power station on site |
| CN111085819B (en) * | 2018-10-24 | 2021-11-12 | 中核核电运行管理有限公司 | Method for preparing neutron flux measuring tube power station on site |
| CN109623210A (en) * | 2018-12-29 | 2019-04-16 | 重庆鑫劲宏景机械有限公司 | Equipment is used in frame of motorcycle welding |
| CN110185883A (en) * | 2019-06-13 | 2019-08-30 | 安徽陶博士环保科技有限公司 | A kind of photochemical trapping device |
| CN112338434A (en) * | 2020-09-27 | 2021-02-09 | 中国石油天然气集团有限公司 | Delayed-cracking-resistant high-strength B-type sleeve fillet welding method |
| CN116677928A (en) * | 2023-08-03 | 2023-09-01 | 苏芯物联技术(南京)有限公司 | Intelligent detection method for welding protection gas pipeline leakage |
| CN116677928B (en) * | 2023-08-03 | 2023-10-10 | 苏芯物联技术(南京)有限公司 | Intelligent detection method for welding protection gas pipeline leakage |
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| CN1285441C (en) | 2006-11-22 |
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Granted publication date: 20061122 |