CN103791158A - Nitrogen and argon pipeline construction technology - Google Patents
Nitrogen and argon pipeline construction technology Download PDFInfo
- Publication number
- CN103791158A CN103791158A CN201410021761.5A CN201410021761A CN103791158A CN 103791158 A CN103791158 A CN 103791158A CN 201410021761 A CN201410021761 A CN 201410021761A CN 103791158 A CN103791158 A CN 103791158A
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- Prior art keywords
- pipeline
- pressure
- nitrogen
- test
- argon gas
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipeline Systems (AREA)
Abstract
Disclosed is a nitrogen and argon pipeline construction technology. According to the construction scheme, the nitrogen and argon pipeline construction technology includes the steps of manufacturing and installation of pipeline supports and hangers, degreasing, acid pickling, neutralization and passivation of pipelines, pipeline installation, pipeline welding, pipeline pressure tests, pipeline blowing and sweeping, and pipeline anticorrosion. The construction processes are reasonably arranged, working efficiency is improved, and the requirement of construction quality is met.
Description
Technical field
The present invention relates to a kind of pipework construction process, especially a kind of nitrogen, argon gas pipeline construction process.
Background technique
The pipeline of supplying nitrogen and argon gas is all high pressure pipe line, Used in Pressure Piping Installation has the features such as disposable and field condition complexity, most important in the quality control in the stages such as preparation of construction and pipeline installation, welding, valves test and installation, pipeline pressure test.
Summary of the invention
In order to solve the difficult problem existing in nitrogen, argon gas pipeline work progress, the present invention proposes a kind of nitrogen, argon gas pipeline construction process, reasonably arrange construction process, improve working efficiency, meet the requirement of construction quality.
The arrangement and method for construction that the present invention solves its technical problem employing is to adopt following flow process: the degreasing of piping support and hanger system peace → pipeline, pickling, neutralization, the installation → pipeline welding → pipeline pressure test → blowing pipeline → pipeline corrosion protection of passivation → pipeline.
The technological scheme of pipeline degreasing in above-mentioned method of construction, pickling, neutralization, passivation construction is as following table:
In above-mentioned arrangement and method for construction, the installation of pipeline should be by first underground rear ground, and first big after small, after first high pressure, the erection sequence of low pressure is installed.
If pipeline is that Stainless Steel Tube and wall thickness are greater than 2mm and adopt common argon tungsten arc process bottoming and capping in such scheme; If being carbon steel tube, pipeline adopts argon arc welding bottoming, the mode of arc welding capping.
In above-mentioned arrangement and method for construction, percentage of detection is 10%, and weld seam answers 100% to carry out radiographic examination.
In above-mentioned method of construction, pipeline pressure test has two schemes, and one is the hydrostatic test, and it two is air pressure experiment, the hydrostatic test: test pressure is 1.5 times of design work pressure; And must not be lower than 0.4Mpa, but be not more than the monomer test pressure of valve in system; Air pressure experiment: the steel pipe test pressure that bears interior pressure is 1.5 times of design work pressure, when the design pressure of pipeline is greater than 0.6MPa, adopts nitrogen pressure testing, can use pressurized air lower than the pipeline of 0.6MPa.
The qualified rear blowing pipeline that just can carry out of leakproofness experimental check in above-mentioned arrangement and method for construction, purges and adopts without oil drying air or nitrogen, purges with the flow velocity that is not less than 20m/s.
Pipeline mopping in such scheme, anti-corrosion method are surface sand-blasting rust cleaning, and reach criterion of acceptability, and priming, intermediate coat and finish paint.
The invention has the beneficial effects as follows the rational construction process that arranged, improved efficiency of construction, guaranteed the quality of construction, saved construction cost.
Embodiment
Construction process of the present invention is the degreasing of piping support and hanger system peace → pipeline, pickling, neutralization, the installation → pipeline welding → pipeline pressure test → blowing pipeline → pipeline corrosion protection of passivation → pipeline.
1. before construction, prepare
In pipeline installation process, should follow first underground rear ground, first big after small, after first high pressure, the erection sequence of low pressure is installed.
Before installing, reply tubing and pipe fitting are cleared up, check and debug.Must remove by part sand, iron filings, slag and other foreign material of pipeline composition components interior.Butt weld answers 100% to carry out radiography detection.According to design or code requirement, support of pipelines, suspension bracket and guiding trestle are checked.Fix with sliding support and conduit saddle and will distinguish, weld on request.Natural gas line should do grounding at suitable position.
Flange group pair with install
Flange group, to front, is answered control flange sealing surface and gasket seal, must not have and affect cut, the spot etc. of sealability defect.Flange connects the bolt that should use same specification, and it is consistent that bolt installation direction is wanted.While single ended bolt being installed on upright pipeline, the head of single ended bolt should be above flange.Fastening nuts should be close to flange, must not have wedging method.Need to add packing ring time, each bolt should not exceed one.Nut after fastening should flush with bolt end face.
3. the degreasing of carbon steel piping, pickling
3.1 carbon steel tubes adopt Dipping process rust cleaning, Dipping process process flow
Degreasing → water flushing → pickling → water flushing → neutralization → passivation → water rinses → is dried
3.2 Dipping process place and facilities
In conjunction with job site situation, pipe pickling place is specified by Party A, and we makes descaling bath, degreasing bath and deactivation slot etc. and carries out degreasing, pickling.Pickling site requirements is had abundant water resources, power supply is complete, is convenient to transportation and stacks.
Degreasing, pickling, deactivation slot all adopt 12rnm steel plate to make, and manufactured size is as follows: grow × look at × height=10m × 1m × 1m.
3.3 pickling formulas:
3.4, pipe pickling processing
After pipe pickling is dry, after passed examination, just can wash a step construction.
4. pipeline welding and flaw detection
Welding method is that pipeline is that Stainless Steel Tube and wall thickness are greater than 2mm and adopt common argon tungsten arc process bottoming and capping; If being carbon steel tube, pipeline adopts argon arc welding bottoming, the mode of arc welding capping.
The welding rod of drying must be put in people's thermostat-container for electrode and build cover, and if desired, thermostat-container for electrode should be opened power autonomous insulation.When following any situation appears in welding environment, and during without effective protective measures, forbid welding: 1. wind speed is greater than 8m/s when arc-welding, and when argon arc welding, wind speed is greater than 2m/s.2. relative moisture is greater than 90%.3. sleety weather.
When flaw detection, tackle butt weld and answer 100% to carry out radiography detection, meet standard and just can carry out next step operation, if the standard of not meeting needs butt welded seam to process, until qualified.
5. pipeline pressure test and purge
5.1 pressure testings are prepared
Before pressure testing, be conscientiously familiar with Pressure test program, be ready to pressure testing device, draw pressure testing flow chart, interim pressure testing pipeline is connected.
5.2 pressure testing conditions
(1) before pressure piping pressure test, the pipeline of having constructed is checked comprehensively, as: support, suspension bracket, guiding trestle, conduit saddle, instrument, valve, compensator etc.
(2) the each quality of welding spot of pressure piping pressure testing scope interior conduit must be qualified, and heat treatment and non-destructive inspection work finish comprehensively.
(3) for pressure piping detects, leak source, mouth of pipe docking point do preservative treatment after pressure testing completes again.
(4), before pressure testing, check the installing engineering of pressure testing system scope interior conduit.Comprise: the certificate of quality file of pipe fitting, pipeline, wlding; Valve, pipe fitting, test data sheet, pipeline welding operating log, non-destructive inspection report and detection position figure etc.
5.3 pipeline pressure test
Pipeline pressure test medium has two kinds: the one, with liquid medium, i.e. clean water; The 2nd, with gas medium, i.e. pressurized air or nitrogen.
5.3.1 test pressure
The test pressure of pipeline should meet designing requirement, in the time of design no requirement (NR):
(1) hydrostatic test: test pressure is 1.5 times of design work pressure; And must not be lower than 0.4Mpa, but be not more than the monomer test pressure of valve in system.
(2) pneumatic test
The steel pipe test pressure that bears interior pressure is 1.5 times of design work pressure.When the design pressure of this engineering pipeline is greater than 0.6MPa, adopt nitrogen pressure testing, can use pressurized air lower than the pipeline of 0.6MPa.
5.3.2 pressure testing
(1) hydrostatic test: the rate of rise is not more than 250KPa/min; And be depressed into test pressure 50% time stop press check; As without anomaly, rise to test pressure to press 25 % to delay at every turn, stop pressing l 0min; Be depressurized to the leakproofness that test pressure stops pressing 30min check system, with not step-down, ne-leakage, that visual nothing is deformed into is qualified.
(2) pneumatic test: pressure should progressively rise, is first raised to 50% of test pressure and checks, as without leaking and anomaly, continues to press the l 0% of test pressure, boosts to gradually test pressure.Every grade of test pressure is answered voltage stabilizing 3 minutes, reaches after test pressure voltage stabilizing 10 minutes, with without leaking, range estimation is qualified without being deformed into.
If any leak source, while needing soldering, must after pressure release, just can carry out.
Pipe flushing or purging
After pipeline pressure test finishes, pipeline conscientiously must be purged or rinses well, gas pipeline scavenging air or nitrogen, end is coated white paint with target plate, does not have the foul such as iron filings, iron rust to be qualified.Fluid pipeline rinses with clean clear water, is qualified until end outlet presents clear water.But also there is gas pipeline to use clean water to rinse, then dry up with gas medium.
Claims (8)
1. nitrogen, an argon gas pipeline construction process, is characterized in that adopting following flow process: the degreasing of piping support and hanger system peace → pipeline, pickling, neutralization, the installation → pipeline welding → pipeline pressure test → blowing pipeline → pipeline corrosion protection of passivation → pipeline.
2. a kind of nitrogen according to claim 1, argon gas pipeline construction process, the technological scheme that it is characterized in that pipeline degreasing in above-mentioned method of construction, pickling, neutralization, passivation construction is as following table:
3. a kind of nitrogen according to claim 1, argon gas pipeline construction process, is characterized in that the installation of pipeline should be by first underground rear ground, and first big after small, after first high pressure, the erection sequence of low pressure is installed.
4. a kind of nitrogen according to claim 1, argon gas pipeline construction process, if it is characterized in that, pipeline is that Stainless Steel Tube and wall thickness are greater than 2mm and adopt common argon tungsten arc process bottoming and capping; If being carbon steel tube, pipeline adopts argon arc welding bottoming, the mode of arc welding capping.
5. a kind of nitrogen according to claim 1, argon gas pipeline construction process, it is characterized in that percentage of detection is 10%, and weld seam answers 100% to carry out radiographic examination.
6. a kind of nitrogen according to claim 1, argon gas pipeline construction process, is characterized in that pipeline pressure test has two schemes, and one is the hydrostatic test, and it two is air pressure experiment, the hydrostatic test: test pressure is 1.5 times of design work pressure; And must not be lower than 0.4Mpa, but be not more than the monomer test pressure of valve in system; Air pressure experiment: the steel pipe test pressure that bears interior pressure is 1.5 times of design work pressure, when the design pressure of pipeline is greater than 0.6MPa, adopts nitrogen pressure testing, can use pressurized air lower than the pipeline of 0.6MPa.
7. a kind of nitrogen according to claim 1, argon gas pipeline construction process, is characterized in that the qualified rear blowing pipeline that just can carry out of leakproofness experimental check in above-mentioned arrangement and method for construction, purges and adopts without oil drying air or nitrogen, purges with the flow velocity that is not less than 20m/s.
8. a kind of nitrogen according to claim 1, argon gas pipeline construction process, is characterized in that pipeline mopping, anti-corrosion method are surface sand-blasting rust cleaning, and reaches criterion of acceptability, and priming, intermediate coat and finish paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410021761.5A CN103791158A (en) | 2014-01-17 | 2014-01-17 | Nitrogen and argon pipeline construction technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410021761.5A CN103791158A (en) | 2014-01-17 | 2014-01-17 | Nitrogen and argon pipeline construction technology |
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| Publication Number | Publication Date |
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| CN103791158A true CN103791158A (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410021761.5A Pending CN103791158A (en) | 2014-01-17 | 2014-01-17 | Nitrogen and argon pipeline construction technology |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089088A (en) * | 2014-06-30 | 2014-10-08 | 成都高普石油工程技术有限公司 | Installation method for pipeline with annual polypropylene conveying capacity being thirty thousand tons |
| CN104214421A (en) * | 2014-08-27 | 2014-12-17 | 无锡市华牧机械有限公司 | Construction process for stainless steel tube |
| CN104325229A (en) * | 2014-09-29 | 2015-02-04 | 茹林宝 | Welding process capable of reducing welding seam rusts |
| CN106545691A (en) * | 2017-01-16 | 2017-03-29 | 溧阳安顺燃气用具总汇有限公司 | A kind of natural gas line construction technology |
| CN107061864A (en) * | 2017-06-28 | 2017-08-18 | 合肥市闵葵电力工程有限公司 | A kind of efficient long-distance pipe installation method |
| CN107552344A (en) * | 2017-08-22 | 2018-01-09 | 金倍励金属（苏州）有限公司 | The surface treatment method of carbon steel guipure |
| CN110567141A (en) * | 2019-09-09 | 2019-12-13 | 重庆建工住宅建设有限公司 | Construction process for cleaning plant pipeline |
-
2014
- 2014-01-17 CN CN201410021761.5A patent/CN103791158A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089088A (en) * | 2014-06-30 | 2014-10-08 | 成都高普石油工程技术有限公司 | Installation method for pipeline with annual polypropylene conveying capacity being thirty thousand tons |
| CN104214421A (en) * | 2014-08-27 | 2014-12-17 | 无锡市华牧机械有限公司 | Construction process for stainless steel tube |
| CN104325229A (en) * | 2014-09-29 | 2015-02-04 | 茹林宝 | Welding process capable of reducing welding seam rusts |
| CN106545691A (en) * | 2017-01-16 | 2017-03-29 | 溧阳安顺燃气用具总汇有限公司 | A kind of natural gas line construction technology |
| CN107061864A (en) * | 2017-06-28 | 2017-08-18 | 合肥市闵葵电力工程有限公司 | A kind of efficient long-distance pipe installation method |
| CN107552344A (en) * | 2017-08-22 | 2018-01-09 | 金倍励金属（苏州）有限公司 | The surface treatment method of carbon steel guipure |
| CN110567141A (en) * | 2019-09-09 | 2019-12-13 | 重庆建工住宅建设有限公司 | Construction process for cleaning plant pipeline |
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Application publication date: 20140514 |