CN105479098A - Online dismounting method for large-scale gas pipeline - Google Patents
Online dismounting method for large-scale gas pipeline Download PDFInfo
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- CN105479098A CN105479098A CN201410530000.2A CN201410530000A CN105479098A CN 105479098 A CN105479098 A CN 105479098A CN 201410530000 A CN201410530000 A CN 201410530000A CN 105479098 A CN105479098 A CN 105479098A
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Abstract
The invention discloses an online dismounting method for a large-scale gas pipeline. The gas pipeline (1) to be dismounted is connected with a gas pipeline (2) in use through a gas valve (3) with flanges (4). The online dismounting method is characterized by comprising the following steps that a, a dismounting preparation is conducted; b, bolts at the bottoms of the flanges are replaced; c, four jacks are installed and put into use; d, blind plates are placed into the flanges; and e, the pipeline to be dismounted is dismounted. The online dismounting method for the large-scale gas pipeline has the advantages that the dismounting step design is reasonable, and operation is easy; compared with the traditional mode that a gas pipeline needs to be stopped and discharged during dismounting, the operation time is shortened, the production benefits are improved, the project cost is reduced, and environment pollution is reduced.
Description
Technical field
The present invention relates to a kind of gas piping method for dismounting, specifically, is the online method for dismounting of a kind of large-sized gas pipeline.
Background technology
Require to remove gas piping not affecting under the condition of production in improvement project construction, namely will solve gas piping and remove operation under production status.But gas piping is removed operation and is usually carried out under nonproductive state, removes gas piping online there is great risk and difficulty with known operating type.
Therefore known dismounting gas piping method also exists above-mentioned all inconvenience and problem.
Summary of the invention
Object of the present invention, what be proposition a kind of " band coal gas shutoff blind plane operation " is not affecting the online method for dismounting of the large-sized gas pipeline removing gas piping under the condition of production.
For achieving the above object, technical solution of the present invention is:
The online method for dismounting of a kind of large-sized gas pipeline, gas piping to be removed is connected with at the gas piping used by the gas valve with flange, it is characterized in that comprising the following steps:
A, dismounting preparation
(1) require that the operating platform that is suitable at the flange position scaffolding height of gas valve and the gradient are less than 30 degree, the width passway for escaping that is greater than 1 meter according to site operation;
(2) professional testing agency is entrusted to measure Gas Pipe Wall Thickness;
(3) carbon monoxide detector testing pipes and flange port, valve No leakage is adopted;
(4) four pairs of brackets are made, and bracket is symmetrically welded in the level of pipeline, plumb position in couples, one of a pair bracket is made to be welded on gas piping to be removed, another is welded on gas valve, four pairs of brackets are arranged in the position up and down of gas piping, prevent that electric current is excessive punctures coal gas tube wall during weld job;
(5) make blind plate according to the diameter steel plate of gas piping to be removed, and two hangers are welded in about 30 ° of positions in plumb line both sides, blind plate top; Each extension 3 tons of chain blocks on the rigging of connection two hangers;
(6) determine that gas piping backs down direction (near apart from expansion joint), back down the separated of side ducts conduit saddle and fixed support, maintenance pipeline can move left and right; Remove all barriers such as platform, railing, technique small pipeline be connected with pipeline;
(7) by increasing the valve closing at blind plate place, with nitrogen, coal gas in pipeline to be removed is replaced, and with gas content in detector testing pipes, the crane of lifting blind plate is parked in the position being convenient to lifting, and is hung up properly by hoisting rig;
The bolt of b, replacing flange base
The 3-4 of a flange base bolt is replaced by the bolt of about 50mm longer than former bolt, and by nut and bolt band buckle, group is to difficulty after disassembling bolts to prevent pipe stress from crossing large flange, and all the other bolts will loosen dismounting one by one;
C, installation, use four jack
Four same load jack are installed at bracket place, are separated two side ducts; Jack is fixing solid and reliable, and action evenly, synchronously, stops action when the gap ejected is about 30mm;
D, in flange, put into blind plate
Remove top jack, slightly firmly prize both sides flange slot with the crowbar of coating butter, and adopt the scraper of coating butter to clear up flange sealing surface by many people; Slowly put down blind plate after completing, when blind plate puts down, want control angle and the spacing with flange, by chain block and crowbar adjustment; Penetrate bolt after blind plate position is correct, remove all the other 3 jack, change bottom stay bolt, even fastening bolt, till boosting to operating pressure employing suds or gas leak detector detection coal gas No leakage;
E, remove pipeline to be removed
Continuous punching in pipeline to be removed, seals, pipe interior tar burning when preventing from cutting pipeline.Once cut in order during cutting, can remove after pipeline to be removed all cuts, just do not allow to get angry after dismounting in device, because the gas piping distance that distance is produced is too near; Site clearing, dismantling operation platform and passway for escaping, complete the work of dismounting pipeline and withdraw scene.
The online method for dismounting of large-sized gas pipeline of the present invention can also be further achieved by the following technical measures.
Aforesaid method, wherein said bracket comprises one piece of right angle triangle, thick 12mm, and two right-angle sides are long 400mm respectively; Two rectangular slabs, thick 12mm, is of a size of 500X200mm and 250X200mm, and wherein the right-angle side of right angle triangle and large rectangle plate, little rectangular slab are welded and fixed successively.
Aforesaid method, considers jack working length during wherein said bracket welding, if valve cannot weld, is then welded on the gas piping tube wall of use.
Aforesaid method, wherein said jack is 32t screw jack.
After adopting technique scheme, the online method for dismounting of large-sized gas pipeline of the present invention has the following advantages:
1, step is removed reasonable in design, simple to operate;
2, need with traditional gas piping operation compared with stopping production diffuses, to shorten the activity duration, improve productivity effect;
3, reduce engineering cost, reduce environmental pollution.
Accompanying drawing explanation
Fig. 1 is the pipeline to be removed of the embodiment of the present invention and the structural representation at the pipeline used;
Fig. 2 is that the bracket of the embodiment of the present invention is installed, used schematic diagram;
Fig. 3 is that the chain block of the adjustment lifting of the embodiment of the present invention is installed and blind plate lifting schematic diagram.
In figure: 1 gas piping to be removed, 2 gas pipings used, 3 gas valves, 4 flanges, 5 jack, 6 brackets, 7 blind plates, 8 hangers, 9 chain blocks, 10 suspension hooks.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is illustrated further.
Embodiment 1
The online method for dismounting of system of the present invention large-sized gas pipeline, now refers to Fig. 1, and Fig. 1 is the pipeline to be removed of the embodiment of the present invention and the structural representation at the pipeline used.As shown in the figure, described gas piping 1 to be removed is connected with at the gas piping 2 used by the gas valve 3 with flange 4, and the online method for dismounting of large-sized gas pipeline of the present invention comprises the following steps:
A, dismounting preparation
(1) require that the operating platform that is suitable at the flange 4 position scaffolding height of gas valve 3 and the gradient are less than 30 degree, the width passway for escaping that is greater than 1 meter according to site operation;
(2) professional testing agency is entrusted to measure Gas Pipe Wall Thickness;
(3) carbon monoxide detector testing pipes and flange port, valve No leakage is adopted;
(4) four pairs of brackets are made, and bracket is symmetrically welded in the level of pipeline, plumb position in couples, one of a pair bracket is made to be welded on gas piping 1 to be removed, another is welded on gas valve 3, four pairs of brackets are arranged in the position up and down of gas piping, prevent that electric current is excessive punctures coal gas tube wall during weld job; Described bracket comprises one piece of right angle triangle, thick 12mm, and two right-angle sides are long 400mm respectively; Two rectangular slabs, thick 12mm, is of a size of 500X200mm and 250X200mm, and wherein the right-angle side of right angle triangle and large rectangle plate, little rectangular slab are welded and fixed successively; Consider jack working length during described bracket welding, if valve cannot weld, be then welded on gas piping 2 tube wall of use.
(5) make blind plate according to the diameter steel plate of gas piping to be removed, and two hangers are welded in about 30 ° of positions in plumb line both sides, blind plate top; Each extension 3 tons of chain blocks on the rigging of connection two hangers;
(6) determine that gas piping backs down direction () apart from expansion joint more closely, unclamp the bolt increasing blind plate one side flange one by one, and be replaced with new bolt or adopt loosening liquid to process, ensure that follow-up increase blind plate construction is carried out smoothly; Back down the separated of side ducts conduit saddle and fixed support, keep pipeline to move left and right; Remove all barriers such as platform, railing, technique small pipeline be connected with pipeline;
Fig. 3 is that the chain block of the adjustment lifting of the embodiment of the present invention is installed and blind plate lifting schematic diagram.
(7) by increasing the valve closing at blind plate place, with nitrogen, coal gas in pipeline to be removed is replaced, and with gas content in detector testing pipes, the crane of lifting blind plate is parked in the position being convenient to lifting, and is hung up properly by hoisting rig;
The bolt of b, replacing flange base
The 3-4 of a flange base bolt is replaced by the bolt of about 50mm longer than former bolt, and by nut and bolt band buckle, group is to difficulty after disassembling bolts to prevent pipe stress from crossing large flange, and all the other bolts will loosen dismounting one by one;
C, installation, use four jack
Fig. 2 is that the bracket of the embodiment of the present invention is installed, used schematic diagram.Four same load jack are installed at bracket place, are separated two side ducts; Jack is fixing solid and reliable, and action evenly, synchronously, stops action when the gap ejected is about 30mm; Described jack is 32t screw jack.
D, in flange, put into blind plate
Remove top jack, slightly firmly prize both sides flange slot with the crowbar of coating butter, and adopt the scraper of coating butter to clear up flange sealing surface by many people; Slowly put down blind plate after completing, when blind plate puts down, want control angle and the spacing with flange, by chain block and crowbar adjustment; Penetrate bolt after blind plate position is correct, remove all the other 3 jack, change bottom stay bolt, even fastening bolt, till boosting to operating pressure employing suds or gas leak detector detection coal gas No leakage;
E, remove pipeline to be removed
Continuous punching in pipeline to be removed, seals, pipe interior tar burning when preventing from cutting pipeline.Once cut in order during cutting, can remove after pipeline to be removed all cuts, just do not allow to get angry after dismounting in device, because the gas piping distance that distance is produced is too near; Site clearing, dismantling operation platform and passway for escaping, complete the work of dismounting pipeline and withdraw scene.
The present invention has substantive distinguishing features and significant technological progress, the online method for dismounting of large-sized gas pipeline of the present invention is not affecting under the condition of production, after detecting flange port No leakage, at pipe flange blind plate installation site welding bracket, adopt jack to be separated by flange, in the middle of flange, install blind plate, fastening bolt docks smoothly, safely, remove large-sized gas pipeline online efficiently, reduce environmental pollution, save the production time.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, can also make various conversion or change.Therefore, all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.
Claims (4)
1. the online method for dismounting of large-sized gas pipeline, gas piping to be removed (1) is connected with at the gas piping used (2) by the gas valve (3) with flange (4), it is characterized in that comprising the following steps:
A, dismounting preparation
(1) require that the operating platform that is suitable at flange (4) the position scaffolding height of gas valve (3) and the gradient are less than 30 degree, the width passway for escaping that is greater than 1 meter according to site operation;
(2) professional testing agency is entrusted to measure Gas Pipe Wall Thickness;
(3) carbon monoxide detector testing pipes and flange port, valve No leakage is adopted;
(4) four pairs of brackets are made, and bracket is symmetrically welded in the level of pipeline, plumb position in couples, one of a pair bracket is made to be welded on gas piping to be removed (1), another is welded on gas valve (3), four pairs of brackets are arranged in the position up and down of gas piping, prevent that electric current is excessive punctures coal gas tube wall during weld job;
(5) make blind plate according to the diameter steel plate of gas piping to be removed, and two hangers are welded in about 30 ° of positions in plumb line both sides, blind plate top; Each extension 3 tons of chain blocks on the rigging of connection two hangers;
(6) determine that gas piping backs down direction (near apart from expansion joint), back down the separated of side ducts conduit saddle and fixed support, maintenance pipeline can move left and right; Remove all barriers such as platform, railing, technique small pipeline be connected with pipeline;
(7) by increasing the valve closing at blind plate place, with nitrogen, coal gas in pipeline to be removed is replaced, and with gas content in detector testing pipes, the crane of lifting blind plate is parked in the position being convenient to lifting, and is hung up properly by hoisting rig;
The bolt of b, replacing flange base
The 3-4 of a flange base bolt is replaced by the bolt of about 50mm longer than former bolt, and by nut and bolt band buckle, group is to difficulty after disassembling bolts to prevent pipe stress from crossing large flange, and all the other bolts will loosen dismounting one by one;
C, installation, use four jack
Four same load jack are installed at bracket place, are separated two side ducts; Jack is fixing solid and reliable, and action evenly, synchronously, stops action when the gap ejected is about 30mm;
D, in flange, put into blind plate
Remove top jack, slightly firmly prize both sides flange slot with the crowbar of coating butter, and adopt the scraper of coating butter to clear up flange sealing surface by many people; Slowly put down blind plate after completing, when blind plate puts down, want control angle and the spacing with flange, by chain block and crowbar adjustment; Penetrate bolt after blind plate position is correct, remove all the other 3 jack, change bottom stay bolt, even fastening bolt, till boosting to operating pressure employing suds or gas leak detector detection coal gas No leakage;
E, remove pipeline to be removed
Continuous punching in pipeline to be removed, seals, pipe interior tar burning when preventing from cutting pipeline;
Once cut in order during cutting, can remove after pipeline to be removed all cuts, just do not allow to get angry after dismounting in device, because the gas piping distance that distance is produced is too near; Site clearing, dismantling operation platform and passway for escaping, complete the work of dismounting pipeline and withdraw scene.
2. the online method for dismounting of large-sized gas pipeline as claimed in claim 1, it is characterized in that, described bracket comprises one piece of right angle triangle, thick 12mm, and two right-angle sides are long 400mm respectively; Two rectangular slabs, thick 12mm, is of a size of 500X200mm and 250X200mm, and wherein the right-angle side of right angle triangle and large rectangle plate, little rectangular slab are welded and fixed successively.
3. the online method for dismounting of large-sized gas pipeline as claimed in claim 1, is characterized in that, considers jack working length, if valve cannot weld, be then welded on gas piping (2) tube wall of use during described bracket welding.
4. the online method for dismounting of large-sized gas pipeline as claimed in claim 1, it is characterized in that, described jack is 32t screw jack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410530000.2A CN105479098B (en) | 2014-10-10 | 2014-10-10 | A kind of online method for dismounting of large-sized gas pipeline |
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| CN201410530000.2A CN105479098B (en) | 2014-10-10 | 2014-10-10 | A kind of online method for dismounting of large-sized gas pipeline |
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| CN105479098A true CN105479098A (en) | 2016-04-13 |
| CN105479098B CN105479098B (en) | 2018-02-16 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106026881A (en) * | 2016-07-17 | 2016-10-12 | 成都聚合追阳科技有限公司 | Reinforcing member for concentrating photovoltaic lower column support and flange |
| CN107781504A (en) * | 2016-08-27 | 2018-03-09 | 中国二十冶集团有限公司 | The integrated method for dismounting of aerial pipeline |
| CN108049655A (en) * | 2017-12-27 | 2018-05-18 | 中国化学工程第三建设有限公司 | A kind of Demolition Construction method of the pipeline with insulating and wearing-resistant lining |
| CN109732176A (en) * | 2019-01-23 | 2019-05-10 | 宣化钢铁集团有限责任公司 | A kind of cutting blocks the support base and its method of Large Diameter Pipeline gas piping |
| CN110092333A (en) * | 2019-05-24 | 2019-08-06 | 郑州水务建筑工程股份有限公司 | A kind of method for dismounting of no-dig technique bell and spigot pipeline |
| CN111003376A (en) * | 2019-11-16 | 2020-04-14 | 宣化钢铁集团有限责任公司 | Safe liquid seal device for full flow pipe of storage tank and installation method |
| CN114526386A (en) * | 2022-01-07 | 2022-05-24 | 广东韶钢工程技术有限公司 | Flowmeter flange dismounting device and using method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026881A (en) * | 2016-07-17 | 2016-10-12 | 成都聚合追阳科技有限公司 | Reinforcing member for concentrating photovoltaic lower column support and flange |
| CN107781504A (en) * | 2016-08-27 | 2018-03-09 | 中国二十冶集团有限公司 | The integrated method for dismounting of aerial pipeline |
| CN107781504B (en) * | 2016-08-27 | 2020-11-03 | 中国二十冶集团有限公司 | Integrated dismounting method for overhead pipeline |
| CN108049655A (en) * | 2017-12-27 | 2018-05-18 | 中国化学工程第三建设有限公司 | A kind of Demolition Construction method of the pipeline with insulating and wearing-resistant lining |
| CN108049655B (en) * | 2017-12-27 | 2020-04-17 | 中国化学工程第三建设有限公司 | Dismantling construction method for pipeline with heat-insulating wear-resistant lining |
| CN109732176A (en) * | 2019-01-23 | 2019-05-10 | 宣化钢铁集团有限责任公司 | A kind of cutting blocks the support base and its method of Large Diameter Pipeline gas piping |
| CN109732176B (en) * | 2019-01-23 | 2024-04-09 | 宣化钢铁集团有限责任公司 | Supporting seat for cutting off and plugging large-diameter gas pipeline and method thereof |
| CN110092333A (en) * | 2019-05-24 | 2019-08-06 | 郑州水务建筑工程股份有限公司 | A kind of method for dismounting of no-dig technique bell and spigot pipeline |
| CN111003376A (en) * | 2019-11-16 | 2020-04-14 | 宣化钢铁集团有限责任公司 | Safe liquid seal device for full flow pipe of storage tank and installation method |
| CN114526386A (en) * | 2022-01-07 | 2022-05-24 | 广东韶钢工程技术有限公司 | Flowmeter flange dismounting device and using method |
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