CN105081592A - Transpositional-free fire modifying method for natural gas pressure guiding device - Google Patents
Transpositional-free fire modifying method for natural gas pressure guiding device Download PDFInfo
- Publication number
- CN105081592A CN105081592A CN201510213762.4A CN201510213762A CN105081592A CN 105081592 A CN105081592 A CN 105081592A CN 201510213762 A CN201510213762 A CN 201510213762A CN 105081592 A CN105081592 A CN 105081592A
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- Prior art keywords
- natural gas
- angry
- pressure
- need
- valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/027—Making tubes with soldering or welding
Abstract
The invention overcomes the defects in the prior art and provides a transpositional-free fire modifying method for a natural gas pressure guiding device. The method sequentially comprises the emptying and decompressing step of shutting down gas pipelines and carrying out emptying and decompressing operation on the gas pipelines; the connecting step of sleeving a welding sleeve on a short joint of a root valve, removing a pressure guiding pipe, replacing a screw thread shot joint and connecting the root valve with the replaced screw thread short joint; and the dispelling step of cutting off the root valve and dispelling residual natural gas in the site. Compared with a traditional fire modifying method with shutdown, decompression and transposition, the method is safe and economical, saves time and also reduces the side effects caused by operation on the environment to the certain degree.
Description
Technical field
The present invention relates to high pressure gas pipeline road technical field, particularly a kind of natural gas pressure-inducting device without the need to displacement is got angry remodeling method.
Background technology
Pneumatic hydraulic actuator rapidly, does not need the advantages such as power supply to be widely used in Long-distance Transmission Pipeline due to the stable transmission of its height, simple to operate, switch.The natural gas of gas-liquid linked valve actuating mechanism is driven generally to take from gas pipeline.At present, the standard that there is no both at home and abroad carries out specification to executing agency's pressure-inducting device structure and connected mode.Define executing agency's pressure guiding pipe is blocked ball valve multiple control modes by one or multiple tracks, root valve welding or the multiple connected mode of not welding.If executing agency's pressure guiding pipe controls by blocking ball valve together, and connected mode adopts the connection of not welding i.e. screw thread and cutting ferrule, due to personnel touch by mistake, valve ground sink or the effect of the unpredictable element such as earthquake, can cause that cutting ferrule comes off, screw thread gas leakage, valve invalidation, pressure guiding pipe is bending even ruptures.Once above-mentioned accident occurs, even also can dispose after valve, before valve or valve itself then can cause pipeline shutdown and blowdown pressure letdown, just can carry out the major accident disposed after displacement, to conduit running, enterprise brings massive losses.
According to operating experience for many years and take a broad survey, for guaranteeing that the safe and reliable pressure guiding pipe connected mode comparing in the industry accreditation is at present: three roads of band full welding root valve block ball valve and control, first ball valve two ends are welded with pressure guiding pipe, and twice ball valve is screwed connection thereafter.Must transform for the pressure guiding pipe that there is potential safety hazard, and be generally by the committed step of pipeline modification at present: (1) blowdown pressure letdown; (2) replace; (3) the qualified rear fire operation of gas detect; (4) welding detects qualified rear operation.The displacement of pipeline nitrogen is in order to ensure safety of getting angry in operation process, but replacement process also brings the tender subject such as duration (shutdown time) length, displacement expense height.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, provide a kind of natural gas pressure-inducting device without the need to displacement and to get angry remodeling method.
The object of the present invention is achieved like this: 1. gas pipeline stopping transportation, and blowdown pressure letdown is to pressure-fired (about 0.2MPa); 2. shift to an earlier date prefabricated welded sleeve, before with screwed connection root valve, first welded sleeve is enclosed within root valve short circuit; 3. remove existing pressure guiding pipe, change former cutting ferrule screw thread short circuit, and connect with root valve; 4., after root valve connects, cutting-off valve, disperses on-the-spot residual natural gas with explosion-proof axial flow fan; 5. gas detect is qualified welds respectively afterwards to the junction of welded sleeve with gas pipeline and root valve; 6. the follow-up twice valve of the qualified rear installation of weld seam detection and pressure guiding pipe.
It is characterized in that: the design of welded sleeve, to be connected with pipeline screw thread cutting ferrule to original root valve and to add dual fail-safe; The design of welded sleeve, makes weld job and hazardous material (fluids) isolate, instead of carries out weld job at root valve and screw thread itself; This method avoid pressure-inducting device transformation of getting angry and need carry out the link of nitrogen displacement to pipeline, save time for construction operation and reduce investment to greatest extent; Because natural gas vent in pipeline is to pressure-fired instead of all emptying, thus decrease emptying amount, save cost, also environmental protection more simultaneously.
According to another invention of the present invention, provide a kind of natural gas pressure-inducting device without the need to displacement and to get angry remodeling method, it is characterized in that, comprise successively: blowdown pressure letdown step: make gas pipeline stopping transportation, and blowdown pressure letdown operation is carried out to gas pipeline; Connection Step: be enclosed within by welded sleeve on root valve short circuit, and pressure guiding pipe of dismantling, change screw thread short circuit, and be connected by the short circuit of root valve with the screw thread after replacing; Disperse step: cut off root valve valve, disperse on-the-spot residual natural gas.
Further, after dispersing step, also comprise welding step: after checking that gas on-site is qualified, the coupling part of welded sleeve and gas pipeline, welded sleeve are welded with the coupling part of root valve.
Further, after the welding step, also comprise: the weld seam of the connecting portion of the coupling part of welded sleeve and gas pipeline, welded sleeve and root valve is detected, detects qualified rear installation second to control valve, the 3rd road control valve and pressure guiding pipe.
Further, in blowdown pressure letdown step, by gas pipeline emptying to 0.2MPa.
Further, dispersing in step, utilizing explosion-proof axial flow fan to disperse on-the-spot residual natural gas.
Further, in welding step, weld job and danger are isolated.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is structure and the connected mode figure of pressure guiding pipe device involved in the present invention.
In figure: (1) root valve, (2) second control valve, (3) the 3rd road control valves, (4) welded sleeve, (5) screw thread, (6) pressure guiding pipe.
Fig. 2 is root valve in pressure guiding pipe device involved in the present invention, welded sleeve, the structure of screw thread and connected mode figure.
In figure: (1) root valve, (4) welded sleeve, (5) screw thread.
Fig. 3 is the profile of welded sleeve involved in the present invention.
In figure: (4) welded sleeve.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
See shown in Fig. 1 to Fig. 3, the object of the present invention is achieved like this: 1. gas pipeline stopping transportation, and blowdown pressure letdown is to pressure-fired (about 0.2MPa); 2. shift to an earlier date prefabricated welded sleeve 4, before connecting root valve 1 with screw thread 5, first welded sleeve 4 is enclosed within root valve 1 short circuit; 3. remove existing pressure guiding pipe 6, change former cutting ferrule screw thread short circuit, and connect with root valve 1; 4. after root valve 1 connects, cut off the valve of root valve 1, disperse on-the-spot residual natural gas with explosion-proof axial flow fan; 5. gas detect is qualified welds respectively afterwards to the junction of welded sleeve 4 with gas pipeline and root valve 1; 6. the follow-up twice valve of the qualified rear installation of weld seam detection (second by-pass valve control 2 and the 3rd road by-pass valve control 3) and pressure guiding pipe 6.
Tarim Oilfield transfering natural gas from the west to the east main force gas field external transport pipeline gram wheel gas transmission line to carry out in transformation operation successful Application the method to gram wheel pipeline 6 valve chamber gas-oil valve pressure guiding pipes and pressure drop rate pipe, application result show the method not only safety, economical, save time, and decrease the negative effect that operation causes environment to a certain extent.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the natural gas pressure-inducting device without the need to displacement is got angry a remodeling method, it is characterized in that, without the need to the process of inert gas replacement fuel gas before getting angry.
2. the natural gas pressure-inducting device without the need to displacement according to claims 1 is got angry remodeling method, it is characterized in that, welded sleeve, weld job and hazardous material (fluids) is isolated, instead of carries out weld job at valve and screw thread itself.
3. the natural gas pressure-inducting device without the need to displacement according to claims 1 is got angry remodeling method, it is characterized in that, in gas pipeline, natural gas vent is to pressure-fired instead of all emptying, thus decreases emptying amount, has saved cost, also environmental protection more simultaneously.
4. the natural gas pressure-inducting device without the need to displacement is got angry a remodeling method, it is characterized in that, comprises successively:
Blowdown pressure letdown step: make gas pipeline stopping transportation, and blowdown pressure letdown operation is carried out to gas pipeline;
Connection Step: be enclosed within by welded sleeve on root valve short circuit, and pressure guiding pipe of dismantling, change screw thread short circuit, and be connected by the short circuit of root valve with the screw thread after replacing;
Disperse step: cut off root valve valve, disperse on-the-spot residual natural gas.
5. the natural gas pressure-inducting device without the need to displacement according to claim 4 is got angry remodeling method, it is characterized in that, described disperse step after, also comprise welding step: after checking that gas on-site is qualified, the coupling part of welded sleeve and gas pipeline, welded sleeve are welded with the coupling part of root valve.
6. the natural gas pressure-inducting device without the need to displacement according to claim 5 is got angry remodeling method, it is characterized in that, after described welding step, also comprise: the weld seam of the connecting portion of the coupling part of welded sleeve and gas pipeline, welded sleeve and root valve is detected, detects qualified rear installation second to control valve, the 3rd road control valve and pressure guiding pipe.
7. the natural gas pressure-inducting device without the need to displacement according to claim 4 is got angry remodeling method, it is characterized in that, in described blowdown pressure letdown step, by gas pipeline emptying to 0.2MPa.
8. the natural gas pressure-inducting device without the need to displacement according to claim 4 is got angry remodeling method, it is characterized in that, disperses in step described, utilizes explosion-proof axial flow fan to disperse on-the-spot residual natural gas.
9. the natural gas pressure-inducting device without the need to displacement according to claim 5 is got angry remodeling method, it is characterized in that, in described welding step, weld job and danger is isolated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510213762.4A CN105081592A (en) | 2014-05-14 | 2015-04-29 | Transpositional-free fire modifying method for natural gas pressure guiding device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410203786 | 2014-05-14 | ||
| CN201510213762.4A CN105081592A (en) | 2014-05-14 | 2015-04-29 | Transpositional-free fire modifying method for natural gas pressure guiding device |
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| CN105081592A true CN105081592A (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510213762.4A Pending CN105081592A (en) | 2014-05-14 | 2015-04-29 | Transpositional-free fire modifying method for natural gas pressure guiding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106764427A (en) * | 2016-12-10 | 2017-05-31 | 大连福佳·大化石油化工有限公司 | Oil-gas pipeline modular repair handling process |
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2015
- 2015-04-29 CN CN201510213762.4A patent/CN105081592A/en active Pending
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| CN1103034A (en) * | 1993-07-20 | 1995-05-31 | 菲希特尔及萨克斯有限公司 | Adjustable hydraulic vibration damper used for vehicle |
| US20060255100A1 (en) * | 2005-05-10 | 2006-11-16 | Honeywell International, Inc. | Method of repair of thin wall housings |
| CN101126477A (en) * | 2007-09-12 | 2008-02-20 | 刘永法 | Plugging device for pipe under pressure and its operation method |
| US20090211072A1 (en) * | 2008-02-25 | 2009-08-27 | Volta Franco | Method for joining together steel pipes for conveying fluids under pressure |
| CN202338709U (en) * | 2011-12-05 | 2012-07-18 | 武汉市建筑设计院 | Anti-corrosion leakage prevention metal pipe joint |
| CN102829270A (en) * | 2012-09-13 | 2012-12-19 | 中国石油天然气股份有限公司 | Method for connecting small-diameter metal pipes |
| CN103434996A (en) * | 2013-08-05 | 2013-12-11 | 辽河石油勘探局 | Connecting method for oil-submerged pump oiling machine with intercepting valve and oil supply pipeline |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106764427A (en) * | 2016-12-10 | 2017-05-31 | 大连福佳·大化石油化工有限公司 | Oil-gas pipeline modular repair handling process |
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Application publication date: 20151125 |