CN107287402A - A kind of method for improving thin-walled pressure vessel stability of external pressure - Google Patents
A kind of method for improving thin-walled pressure vessel stability of external pressure Download PDFInfo
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- CN107287402A CN107287402A CN201710411995.4A CN201710411995A CN107287402A CN 107287402 A CN107287402 A CN 107287402A CN 201710411995 A CN201710411995 A CN 201710411995A CN 107287402 A CN107287402 A CN 107287402A
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- pressure
- pressure vessel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2241/00—Treatments in a special environment
- C21D2241/01—Treatments in a special environment under pressure
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
The present invention relates to pressure vessel manufacturing field, it is desirable to provide a kind of method of raising thin-walled pressure vessel stability of external pressure.This method be using force (forcing) pump to fill water pressure vessel carry out internal pressure lifting, after internal pressure super pressure treatment Pu is boosted to pressurize for a period of time, then pressure release；Wherein, for internal pressure vessel, internal pressure super pressure treatment Pu is 1.6 to 1.8 times of design pressure；For external pressure vessel, internal pressure super pressure treatment Pu is calculate pressure Pc 1.6 to 1.8 times.The present invention improves the shape defects such as thin-walled pressure vessel circularity, and then effectively improve thin-walled pressure vessel stability of external pressure by carrying out internal pressure superpressure processing to thin-walled pressure vessel.It present invention obviates the process of cumbersome pressure vessel roundness measurement, and actively can easily improve the various shapes defects such as the circularity of external pressure vessel, improve the stability of external pressure of thin-walled pressure vessel.
Description
Technical field
The present invention is more particularly to a kind of thin-walled pressure vessel stability of external pressure that improves on pressure vessel manufacturing field
Method.
Background technology
Thin-walled pressure vessel generally refers to wall thickness less than or equal to the pressure vessel that 1/10 housing of diameter is constituted, and generally uses
Make storage in the industries such as chemical industry, oil refining and nuclear power, heat exchange, reaction, separation equipment and boiler-steam dome etc..
In the presence of outer compressive load, thin-walled pressure vessel may lose original geometry suddenly, occur flexing failure,
Do great damage, so prevent flexing failure for external pressure thin-walled pressure vessel and the internal pressure thin-walled pressure vessel pole of external pressure may be born
To be important.Because the stability of external pressure of thin-walled pressure vessel is very sensitive for shape defects such as circularity, standard GB/T 150-
2011《Pressure vessel》Make stipulations, it is necessary to be checked using interior arch or outer arch model after the completion of the weldering of pressure vessel cylinder group
Housing circularity, and judge whether circularity meets requirement.
The circularity of pressure vessel is detected using model, there is following deficiency：There is error in multiple working procedure, such as model processing is missed
Difference and error in reading etc.；Because container dimensional and shape are ever-changing, if making model for each container, resource can be caused
Waste.If cylinder not yet with end socket weld, when cylinder roundness is unsatisfactory for requiring, usually using veneer reeling machine it is round as a ball, for size compared with
Bulk container operation inconvenience.If cylinder and end socket welded completion, when cylinder roundness is unsatisfactory for requiring, there is no good solution party
Case.
There is disadvantages mentioned above and deficiency in existing Pressure Vessel Manufacture Process, urgently propose that one kind can be with quick and convenient at present
Ground improves thin-walled pressure vessel circularity and can effectively improve the technical scheme of its stability of external pressure.
The content of the invention
The technical problem to be solved in the present invention is to overcome deficiency of the prior art to improve thin-wall pressure there is provided one kind to hold
The method of device stability of external pressure.This method improves thin-walled pressure vessel by carrying out internal pressure superpressure processing to thin-walled pressure vessel
The shape defects such as circularity, and then effectively improve thin-walled pressure vessel stability of external pressure.
In order to solve the above technical problems, the solution of the present invention is：
A kind of method for improving thin-walled pressure vessel stability of external pressure is provided, is that the pressure for filling water is held using force (forcing) pump
Device carries out internal pressure lifting, is boosting to internal pressure super pressure treatment PuAfterwards pressurize for a period of time, then pressure release；Wherein,
(1) for internal pressure vessel, internal pressure super pressure treatment PuFor 1.6 to 1.8 times of design pressure；
(2) for external pressure vessel, internal pressure super pressure treatment PuTo calculate pressure Pc1.6 to 1.8 times；Wherein,
The calculating pressure P of cylindrical shape external pressure vesselcBy formulaCalculate and obtain；
The calculating pressure P of spherical shell shape external pressure vesselcBy formulaCalculate and obtain；
In above-mentioned formula, [σ]tFor the allowable stress of container wall material, φ is welded joint coefficient, and δ is cylinder or ball
The calculated thickness of shell, DiFor the interior diameter of container.
In the present invention, in boost process, rate of pressure rise is controlled as follows：
(1) for internal pressure vessel, pressure is risen to before design pressure, and maximum rate of pressure rise is no more than 0.5MPa/min；Pressure
Power is risen to after design pressure, and maximum rate of pressure rise is no more than 0.1MPa/min；
(2) for external pressure vessel, pressure rises to calculating pressure PcBefore, maximum rate of pressure rise is no more than 0.5MPa/min；
Pressure rises to calculating pressure PcAfterwards, maximum rate of pressure rise is no more than 0.1MPa/min.
In the present invention, the time of the pressurize is no less than 30 minutes.
Inventive principle is described：
For thin-walled internal pressure vessel, to investigate bulk strength, rigidity and the stability of container, the densification of welding point is checked
Property, the sealing property of sealing structure is verified, is eliminated or reduction welding residual stress, the peak stress in partial discontinuous area, to micro-
Crackle produces closed effect, passivation micro-crack tip etc., it will usually carry out pressure test after finalization of the manufacture.For thin-walled external pressure
Container, the main purpose of pressure test is the sealing property of the compactness and checking sealing structure that check welding point.For interior
Pressure vessel, external pressure vessel and vacuum tank, hydraulic pressure pneumatic test pressure value are 1.25 times of design pressure.
The present invention is creatively proposed, internal pressure superpressure processing is carried out to thin-walled pressure vessel.It is interior for internal pressure vessel
Press super pressure treatment PuFor 1.6 to 1.8 times of design pressure, for external pressure vessel, internal pressure super pressure treatment PuFor meter
Calculate pressure Pc1.6 to 1.8 times.Internal pressure super pressure treatment PuIt is significantly larger than numerical value used in usual pressure test, its purpose
It is：During superpressure processing, plastic deformation occurs for container and bulging becomes round, improves stability of external pressure.In processing procedure, thin-walled pressure
Force container bulging becomes round, improves the shape defects such as thin-walled pressure vessel circularity so as to realize, and then effectively improve thin-walled pressure
Force container stability of external pressure.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, the present invention improves the shapes such as thin-walled pressure vessel circularity by carrying out internal pressure superpressure processing to thin-walled pressure vessel
Defect, and then effectively improve thin-walled pressure vessel stability of external pressure.
2nd, present invention obviates the process of cumbersome pressure vessel roundness measurement, and external pressure can easily actively be improved
The various shapes defect such as circularity of container, improves the stability of external pressure of thin-walled pressure vessel.
Brief description of the drawings
Fig. 1 is flow chart of the invention.
Fig. 2 is the layout drawing of vessel internal pressure superpressure processing unit.
Fig. 3 is the sectional view of pressure vessel in embodiment.
Reference in figure is：1 appliance stand；2 pressure sensors；3 recording instrument without paper；4 force (forcing) pumps.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.Embodiment can make this specialty
Professional and technical personnel the present invention, but do not limit the invention in any way is more fully understood.
Internal pressure superpressure processing unit is built first：Thin-walled pressure vessel is fixed on appliance stand 1, filled into container
Clean water.Then force (forcing) pump 4 is connected with pressure vessel with pipeline, pressure sensor 2, pressure sensor 2 is installed on pipeline
It is connected with recording instrument without paper 3.
The method for improving thin-walled pressure vessel stability of external pressure, is carried out using 4 pairs of pressure vessels for filling water of force (forcing) pump
Internal pressure is lifted, and is boosting to internal pressure super pressure treatment PuPressurize is no less than 30 minutes afterwards, then pressure release；Wherein,
(1) for internal pressure vessel, internal pressure super pressure treatment PuFor 1.6 to 1.8 times of design pressure；
(2) for external pressure vessel, internal pressure super pressure treatment PuTo calculate pressure Pc1.6 to 1.8 times；Wherein,
The calculating pressure P of cylindrical shape external pressure vesselcBy formulaCalculate and obtain；
The calculating pressure P of spherical shell shape external pressure vesselcBy formulaCalculate and obtain；
In above-mentioned formula, [σ]tFor the allowable stress of container wall material, φ is welded joint coefficient, and δ is cylinder or ball
The calculated thickness of shell, DiFor the interior diameter of container.
In boost process, rate of pressure rise is controlled as follows：
(1) for internal pressure vessel, pressure is risen to before design pressure, and maximum rate of pressure rise is no more than 0.5MPa/min；Pressure
Power is risen to after design pressure, and maximum rate of pressure rise is no more than 0.1MPa/min；
(2) for external pressure vessel, pressure rises to calculating pressure PcBefore, maximum rate of pressure rise is no more than 0.5MPa/min；
Pressure rises to calculating pressure PcAfterwards, maximum rate of pressure rise is no more than 0.1MPa/min.
Concrete application example：
(1) it is cylindrical shape external pressure vessel to build process object in internal pressure superpressure processing unit, this example as shown in Figure 2；
(2) internal pressure super pressure treatment is determined：According to cylinder interior diameter (Di=300mm), calculated thickness (δ=1.1mm),
The allowable stress ([σ] of welded joint coefficient (φ=1) and materialt=270MPa), according to formulaCalculate Pc=
2.0MPa.According to internal pressure super pressure treatment PuIt is to calculate pressure Pc1.6 times calculating, Pu=3.2MPa.
(3) internal pressure superpressure processing procedure is performed：Apply internal pressure, when internal pressure is less than or equal to 2.0MPa, pressurization per minute
0.4MPa；After 2.0MPa, pressurization 0.1MPa per minute；When being pressurized to 3.2MPa, start pressurize 30 minutes.
(4) release after pressurize：After the completion of pressurize, start release.
In this example, successively tested using the cylindrical shape external pressure vessel of two identical sizes.The outer pressure-volume of cylindrical shape
Device design interior diameter is 300mm, and nominal thickness is 2mm, and calculated thickness is 1.1mm (as shown in Figure 3).Two cylinder roundness are respectively
2.98% and 2.51%, but superpressure processing only is carried out to the latter.External pressure flexing pressure test is carried out again after processing, without super
The container external pressure flexing pressure of pressure processing is 244kPa, and the external pressure flexing pressure handled by superpressure is 462kPa.Therefore, internal pressure
External pressure flexing pressure improves 89.3% compared to the former after superpressure processing.
Through the laggard line number of applicant's test of many times according to statistics：After the processing of internal pressure superpressure, it usually can realize cylinder
Container circularity averagely reduces by 51.09%, and flexing pressure value averagely lifts 34.60%.Therefore, the solution have the advantages that non-
It is often significant.
Finally it should be noted that listed above is only specific embodiment of the invention.It is clear that the invention is not restricted to
Above example, can also there is many variations.One of ordinary skill in the art can directly lead from present disclosure
All deformations for going out or associating, are considered as protection scope of the present invention.
Claims (3)
1. a kind of method for improving thin-walled pressure vessel stability of external pressure, it is characterised in that be to filling water using force (forcing) pump
Pressure vessel carries out internal pressure lifting, is boosting to internal pressure super pressure treatment PuAfterwards pressurize for a period of time, then pressure release；Wherein,
(1) for internal pressure vessel, internal pressure super pressure treatment PuFor 1.6 to 1.8 times of design pressure；
(2) for external pressure vessel, internal pressure super pressure treatment PuTo calculate pressure Pc1.6 to 1.8 times；Wherein,
The calculating pressure P of cylindrical shape external pressure vesselcBy formulaCalculate and obtain；
The calculating pressure P of spherical shell shape external pressure vesselcBy formulaCalculate and obtain；
In above-mentioned formula, [σ]tFor the allowable stress of container wall material, φ is welded joint coefficient, and δ is the meter of cylinder or spherical shell
Calculate thickness, DiFor the interior diameter of container.
2. according to the method described in claim 1, it is characterised in that in boost process, rate of pressure rise is controlled as follows：
(1) for internal pressure vessel, pressure is risen to before design pressure, and maximum rate of pressure rise is no more than 0.5MPa/min；Pressure liter
To design pressure, maximum rate of pressure rise is no more than 0.1MPa/min；
(2) for external pressure vessel, pressure rises to calculating pressure PcBefore, maximum rate of pressure rise is no more than 0.5MPa/min；Pressure liter
To calculating pressure PcAfterwards, maximum rate of pressure rise is no more than 0.1MPa/min.
3. according to the method described in claim 1, it is characterised in that the time of the pressurize is no less than 30 minutes.
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| CN201710411995.4A CN107287402B (en) | 2017-06-02 | 2017-06-02 | A method of improving thin-walled pressure vessel stability of external pressure |
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| CN201710411995.4A CN107287402B (en) | 2017-06-02 | 2017-06-02 | A method of improving thin-walled pressure vessel stability of external pressure |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564859A (en) * | 2011-12-27 | 2012-07-11 | 浙江大学 | Instability test device of external pressure vessel |
| CN103276171A (en) * | 2013-05-28 | 2013-09-04 | 浙江大学 | Method for determining strain strengthening pressure maintaining completion time of austenitic stainless steel low-temperature container |
| CN103320592A (en) * | 2013-05-28 | 2013-09-25 | 浙江大学 | Method for predicting dwell time for strain-strengthening austenitic stainless steel low temperature container |
| CN106372270A (en) * | 2015-07-23 | 2017-02-01 | 中国科学院沈阳自动化研究所 | Life cycle group search optimization algorithm-based optimization design method for pressure container |
-
2017
- 2017-06-02 CN CN201710411995.4A patent/CN107287402B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564859A (en) * | 2011-12-27 | 2012-07-11 | 浙江大学 | Instability test device of external pressure vessel |
| CN103276171A (en) * | 2013-05-28 | 2013-09-04 | 浙江大学 | Method for determining strain strengthening pressure maintaining completion time of austenitic stainless steel low-temperature container |
| CN103320592A (en) * | 2013-05-28 | 2013-09-25 | 浙江大学 | Method for predicting dwell time for strain-strengthening austenitic stainless steel low temperature container |
| CN106372270A (en) * | 2015-07-23 | 2017-02-01 | 中国科学院沈阳自动化研究所 | Life cycle group search optimization algorithm-based optimization design method for pressure container |
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