CN110005895A - Reducing elbow and the pipe arrangement connection method for utilizing reducing elbow - Google Patents
Reducing elbow and the pipe arrangement connection method for utilizing reducing elbow Download PDFInfo
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- CN110005895A CN110005895A CN201910270774.9A CN201910270774A CN110005895A CN 110005895 A CN110005895 A CN 110005895A CN 201910270774 A CN201910270774 A CN 201910270774A CN 110005895 A CN110005895 A CN 110005895A
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- reducing elbow
- pipeline
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- straight pipe
- reducing
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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
- F16L43/00—Bends; Siphons
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The present invention provides a kind of reducing elbow comprising: sequentially connected first straight pipe, bend loss, reducer and the second straight pipe, and first straight pipe is different from the outer diameter of second straight pipe；All pipeline sections of the reducing elbow are integrally formed.Correspondingly, a kind of pipe arrangement connection method using the reducing elbow is provided.The present invention can realize the turning function of pipeline while realizing the variable diameter connection between various outer diameter pipeline, equipment and instrument, and the effective flexibility for improving nuclear power pipeline arrangement saves pipeline arrangement space, reduces duct length, reduce cost.Meanwhile the weld seam quantity of pipeline reducing section is reduced, improve pipe stress distribution, improve seismatic method for pipeline performance, reduces the prefabricated welding workload of pipeline field, and improve pipeline field installation effectiveness.
Description
Technical field
The present invention relates to pipeline PIPING DESIGN and applied technical fields, and in particular to a kind of reducing elbow and a kind of benefit
With the pipe arrangement connection method of the reducing elbow.
Background technique
Due to particular/special requirement of the nuclear power plant technique pipeline in safety, makes it have the process pipe system of redundancy and answer
Miscellaneous pipe arrangement mode, simultaneously because the pipe arrangement spaces compact of Nuclear Power Station Factory Building, some pipeline antidetonations with higher
It is required that therefore increasing pipe arrangement design, prefabricated and welding difficulty.
2 are less than or equal to for diameter " pipeline, the connection between pipe fitting passes through frequently with socket welded mode.If two companies
Carry out turning between contact one time 90 degree it is curved, and there are a variable diameters to need when using traditional connection method using one
Socket-welding elbow and a socket weld reducing joint, and need 6 weld seams that can complete.In addition it is also necessary to which enough cloth empties
Between meet installation requirement, increase the difficulty of nuclear power workshop stringing.
By taking the main feedwater flow control system of nuclear island reactor building as an example, the liquid level of a fluid level transmitter of the system is surveyed
The one end in buret road is connected with steam generator, and the other end then connects the shut-off valve below fluid level transmitter, the outer diameter of shut-off valve
It is different with the level gauging interface tube outer diameter of steam generator.Since pipe arrangement height is higher, room arrangement space is nervous, is
Meet seismatic method for pipeline requirement, need to control the length of level gauging pipeline, adjusts duct orientation in realizing in a limited space
Realize that the variable diameter of shut-off valve and pipeline enclosure connects simultaneously.Above-mentioned similar situation, not using traditional variable diameter concentric reducer and bend pipe
The above several points requirement can be combined, therefore this field needs design reducing elbow integral type connection scheme, to reduce pipe fitting
Using and weld seam quantity, save arrangement space, and different tube diameters pipeline can connected and equipment, instrument while adjust pipeline
Trend.
Summary of the invention
The present invention is completed in order at least partly solve the technical problems existing in the prior art.
Solving technical solution used by present invention problem is:
The present invention provides a kind of reducing elbow comprising: sequentially connected first straight pipe, bend loss, reducer and
Two straight pipes, and first straight pipe is different from the outer diameter of second straight pipe；All pipeline sections one of the reducing elbow
It is body formed.
Optionally, the outer diameter of first straight pipe is greater than the outer diameter of second straight pipe.
Optionally, bore hole and groove are machined at the nozzle of first straight pipe and second straight pipe.
The present invention also provides a kind of pipe arrangement connection methods using the reducing elbow comprising following steps:
1) Preliminary design is carried out to the reducing elbow: is connected according to the arrangement space of the reducing elbow and its both ends
Crank degree and relative distance between items nozzle, the bending angle and radius of the bend loss of reducing elbow described in Preliminary design, with
And the length of first straight pipe, reducer and the second straight pipe；
2) design is arranged to the reducing elbow: the outer dimension of the reducing elbow according to Preliminary design, it is comprehensive
It closes and considers construction and installation factor, the positions of the items of the connection of reducing elbow both ends described in appropriate adjustment, angle and periphery items
Position；
3) mechanics verifying is carried out to the reducing elbow.
Optionally, in step 1), the arrangement space of the reducing elbow connects items according to the reducing elbow both ends
Position, outer dimension and periphery items arrangement determine.
Optionally, the step 1) further include:
The nozzle sizes and wall thickness of items, Preliminary design institute are connected with the reducing elbow both ends according to relevant criterion file
State the welding manner and wall thickness of reducing elbow.
Optionally, the step 2) further include:
The adjustment knot of the position of items, the position of angle and periphery items is connected according to the reducing elbow both ends
Fruit is adjusted the outer dimension and welding manner of the reducing elbow.
Optionally, the step 3) specifically includes:
31) it tests to the mechanical property of the reducing elbow；
32) it tests to the weld strength of the reducing elbow；
33) stress analysis is carried out to piping where the reducing elbow；
34) according to above-mentioned steps 31) to step 33) analytical control as a result, to the outer dimension of the reducing elbow and
Pipe arrangement mode is adjusted, until meeting design requirement.
Optionally, the step 3) further include:
35) according to the stress analysis result of piping where the reducing elbow, it is determined whether set on the reducing elbow
Set bracket and backing positions, number of holders, cradling function and load on the reducing elbow.
Optionally, the step 3) further include:
36) according to the shockproof requirements of the reducing elbow, pipe fitting aseismic analysis is carried out；It is adjusted further according to aseismic analysis result
The mechanical property of the reducing elbow, until its mechanical property meets design requirement under seismic condition.
The utility model has the advantages that
The pipe arrangement connection method of reducing elbow of the present invention and the utilization reducing elbow can realized outside different
While variable diameter between diameter pipeline, equipment and instrument connects, the turning function of pipeline is realized, it is effective to improve nuclear power pipeline cloth
Pipeline arrangement space is saved in the flexibility set, and is reduced duct length, is reduced cost.Meanwhile reducing the weld seam number of pipeline reducing section
Amount improves pipe stress distribution, improves seismatic method for pipeline performance, reduces the prefabricated welding workload of pipeline field, and it is existing to improve pipeline
Field installation effectiveness.
Detailed description of the invention
Fig. 1 is the application schematic diagram for the reducing elbow that the embodiment of the present invention 1 provides；
Fig. 2 is the two-dimensional structure schematic diagram for the reducing elbow that the embodiment of the present invention 1 provides；
Fig. 3 is the pipe arrangement connection method using reducing elbow shown in Fig. 1 and Fig. 2 that the embodiment of the present invention 2 provides
Flow chart.
In figure: the first straight pipe of 1-；2- bend loss；3- reducer；The second straight pipe of 4-；5- support of pipelines；6-
Valve adapter tube；7- angle valve.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawings and examples to this
Invention is described in further detail.
Embodiment 1:
The present embodiment provides a kind of reducing elbows, can be applied in nuclear power plant technique pipeline.As depicted in figs. 1 and 2, described
Reducing elbow includes: sequentially connected first straight pipe 1, bend loss 2, reducer 3 and the second straight pipe 4, and the first straight pipe 1
It is different from the outer diameter of the second straight pipe 4.All pipeline sections of the reducing elbow are integrally formed.
Certainly, for the ease of production, the outer diameter of the first straight pipe 1 is identical as the outer diameter of bend loss 2, bend loss 2
Outer diameter is also identical as the outer diameter of 3 one end of reducer, and the outer diameter of 3 other end of reducer is identical as the outer diameter of the second straight pipe 4.Its
In, one end of reducer 3 refers to one end that reducer 3 is connected with bend loss 2, and the other end of reducer 3 refers to reducer 3
The one end being connected with the second straight pipe 4.
In the present embodiment, the reducing elbow includes the first straight pipe 1 and the second straight pipe 4 and curved of various outer diameter
Pipeline section 2 and reducer 3, therefore the variable diameter in pipeline connection procedure can be achieved at the same time and adjust the function of pipeline rout.Moreover, institute
All pipeline sections for stating reducing elbow are integrally formed, i.e., four component parts of the described reducing elbow use overall processing mode, respectively
Without welding between component part, there is good mechanical property, not only reduced the usage quantity of pipe fitting, but also reduce weld seam number
Amount, also as save arrangement space.
Fig. 1 shows the process pipe arrangement connection type with the reducing elbow, wherein each composition of reducing elbow
Part includes the first straight pipe 1, the second straight pipe 4, bend loss 2 and reducer 3, wherein at the nozzle of the second straight pipe 4 and instrument
Table angle valve 7 connects, and connect at the nozzle of the first straight pipe 1 with equipment or pipeline, and be provided with support of pipelines on the first straight pipe 1
5。
Fig. 2 shows the two-dimensional structure of the reducing elbow, wherein the length of the first straight pipe 1 is the A in Fig. 2, second
The length of straight pipe 4 is the C in Fig. 2；The nozzle outer diameter of first straight pipe 1 is that Φ D1, the spout diameter in Fig. 2 are in Fig. 2
Φ d1, the nozzle outer diameter of the second straight pipe 4 are that Φ D2, the spout diameter in Fig. 2 are Φ d2 in Fig. 2；The radius of bend loss 2 is
R in Fig. 2, bending angle are the θ in Fig. 2；The length of reducer 3 is the B in Fig. 2.
In actual application, designer can become according to pipe arrangement space and pipeline and the adjustment of equipment caliber
The outer dimension of diameter bend pipe.Specifically, the length of the length A of the first straight pipe 1, the length B of reducer 3 and the second straight pipe 4
The bending angle θ and radius R of C and bend loss 2, should be designed selection according to pipeline rout.
As depicted in figs. 1 and 2, the outer diameter of the first straight pipe 1 is greater than the outer diameter of the second straight pipe 4.In other words, bend loss 2
Outer diameter it is identical as the outer diameter of biggish first straight pipe 1 of outer diameter；The both ends of reducer 3 are smaller with bend loss 2 and outer diameter respectively
The second straight pipe 4 be connected, specifically, the biggish one end of the outer diameter of reducer 3 is connected with bend loss 2, the outer diameter of reducer 3 compared with
Small one end is connected with the second straight pipe 4.
As for the specific size of the first straight pipe 1 and the outer diameter of the second straight pipe 4, can according to the equipment of connection or pipeline into
Row processing；The bending angle of the length and bend loss 2 of first straight pipe 1 and the second straight pipe 4 can be wanted according to different arrangements
It asks and carries out selection processing.
Specifically, as shown in Fig. 2, the length C of the length A of the first straight pipe 1 and the second straight pipe 4 can be according to practical pipeline
It is designed and processes with the different situations of equipment.Certainly, the maximum value and minimum value of length A and length C all needs to meet pipe
The requirement of part process equipment.
The length B of reducer 3 needs to be determined according to first straight pipe 1 at both ends and the outer diameter and length of the second straight pipe 4.
The radius R and bending angle θ of bend loss 2 can be designed and process according to the different situations of practical pipeline, wherein
Crank degree between the pipeline of the design value of bending angle θ connection according to required for reducing elbow both ends or the nozzle of equipment is true
It is fixed.Certainly, the value of the radius R and bending angle θ of bend loss 2 need to meet the requirement of pipe fitting process equipment.
After determining the value of bending angle θ of bend loss 2, can according to reducing elbow both ends connect pipeline or equipment it
Between relative distance, calculate the total length of reducing elbow.The bending angle θ of total length and bend loss 2 further according to reducing elbow
Value, the length of the radius R of Preliminary design bend loss 2 and the first straight pipe 1, reducer 3 and the second straight pipe 4.
Moreover, the selected of the overall dimension of the reducing elbow needs to analyze by pipe stress.Wherein first is straight
Bracket can be set on pipeline section 1 and the second straight pipe 4 to meet the support of pipeline, and the design of the structure of reducing elbow is reasonable
Property and whether support of pipelines be set, should be determined according to Mechanics Calculation.
As shown in Fig. 2, be machined with bore hole and groove at the nozzle of the first straight pipe 1 and the second straight pipe 4, in order to
Other pipelines or equipment connection, the distinct device and pipeline that can be connected as needed are carried out using butt welding or socket welded mode
Connection.
In conclusion reducing elbow provided in this embodiment both has the function of changing pipeline direction, while also having and connecting
Connect the function of the pipeline of various outer diameter, equipment and instrument.Moreover, the reducing elbow uses overall processing mode, pipe is simplified
Welding sequence in road prefabrication process.
Embodiment 2:
The present embodiment provides a kind of pipe arrangement connection methods using reducing elbow described in embodiment 1, can be applied to
Diameter is less than or equal to 2 " pipeline and equipment connection procedure in, to solve diameter less than or equal to 2 " tradition piping connection in deposit
, different tube diameters equipment and piping connect and problem difficult to install in limited arrangement space.
The pipe arrangement connection method includes: reducing elbow Preliminary design process, the layout design process of reducing elbow,
And the mechanics verification process of reducing elbow.It is described in detail below with reference to Fig. 3.
As shown in figure 3, the pipe arrangement connection method specifically comprises the following steps S101 to S103.
S101. Preliminary design is carried out to reducing elbow: items pipe is connected according to the arrangement space of reducing elbow and its both ends
Crank degree and relative distance between mouthful, the bending angle θ and radius R and first of the bend loss of Preliminary design reducing elbow are straight
The length C of the length A of pipeline section, the length B of reducer and the second straight pipe；The connection items refer to other pipelines or set
It is standby；
S102. be arranged design to reducing elbow: the outer dimension of the reducing elbow according to Preliminary design comprehensively considers
Construction and installation factor, appropriate adjustment reducing elbow both ends connect the position of the position of items, angle and periphery items；
S103. mechanics verifying is carried out to reducing elbow.
In the present embodiment, the pipe arrangement connection method realizes adjustment pipe with the reducing elbow of special designing simultaneously
The function of road trend and variable diameter, improves the flexibility of pipeline arrangement, reduces duct length and saves pipeline arrangement space, also
Reduce the weld seam quantity of pipeline reducing section, improves pipe stress distribution, reduce the workload of the prefabricated welding of pipeline field, thus
Improve pipeline field installation effectiveness.
In step s101, the arrangement space of reducing elbow connects position, the shape ruler of items according to reducing elbow both ends
Very little and periphery items arrangements determine.
In step s101, the bending angle θ and radius R and the first straight tube of the bend loss of Preliminary design reducing elbow
The step of length C of the length A of section, the length B of reducer and the second straight pipe specifically:
The length A of first straight pipe and the length C of the second straight pipe can be designed according to the different situations of practical pipeline
And processing；Certainly, the maximum value and minimum value of length A and length C all needs to meet the requirement of pipe fitting process equipment；
The length B of reducer needs to be determined according to first straight pipe at both ends and the outer diameter and length of the second straight pipe；
The radius R and bending angle θ of bend loss can be designed and process according to the different situations of practical pipeline, wherein curved
The design value of bent angle, θ connects the crank degree between the nozzle of items according to reducing elbow both ends and determines；Certainly, bend loss
The value of radius R and bending angle θ need to meet the requirement of pipe fitting process equipment；
After determining the value of bending angle θ of bend loss, it can be connected according to reducing elbow both ends opposite between items
Distance calculates the total length of reducing elbow；The value of the bending angle θ of total length and bend loss further according to reducing elbow, just
The radius R of step design bend loss and length A, the length B of reducer and the length C of the second straight pipe of the first straight pipe.
Step S101 further include:
It is empty to comprehensively consider installation for the nozzle sizes and wall thickness for connecting items with reducing elbow both ends according to relevant criterion file
Between, the welding manner and wall thickness of Preliminary design reducing elbow.
When the connection caliber of reducing elbow is smaller, socket welded welding manner can be used.The selection of reducing elbow wall thickness
Pipe fitting stress analysis result is needed to refer to be designed.
Step S102 further include:
The adjustment of the position of items, the position of angle and periphery items is connected as a result, right according to reducing elbow both ends
The outer dimension and welding manner of reducing elbow are adjusted.
It should be noted that in step s 102, to position, angle and the periphery items of reducing elbow both ends connection items
Position set-up procedure, and the outer dimension of reducing elbow and the set-up procedure of welding manner can be repeated several times,
Until reaching optimal arrangement.
Step S103 is specifically included:
S1031. it tests to the mechanical property of reducing elbow, specifically, to structural strength, the rigidity etc. of reducing elbow
Mechanical property is tested；
S1032. it tests to the weld strength of reducing elbow, specifically, according to tube design class requirement to variable diameter
The weld strength of bend pipe carries out Mechanics Calculation inspection；
S1033. stress analysis is carried out to piping where reducing elbow；
S1034. according to above-mentioned steps S1031 to the analytical control of step S1033 as a result, the outer dimension to reducing elbow
It is adjusted with pipe arrangement mode, until meeting design requirement.In other words, if analytical control result is unsatisfactory for design requirement,
It then repeats the above process, the outer dimension and pipe arrangement mode to reducing elbow continue to adjust, and want until meeting design
It asks.
Step S103 further include:
S1035. according to the stress analysis result of piping where reducing elbow, it is determined whether branch is arranged on reducing elbow
Backing positions, number of holders, cradling function and load on frame and reducing elbow.
Step S103 further include:
S1036. according to the shockproof requirements of reducing elbow, pipe fitting aseismic analysis is carried out；It is adjusted further according to aseismic analysis result
The mechanical property of reducing elbow, until its mechanical property meets design requirement under seismic condition.
In the present embodiment, when reducing elbow there are shockproof requirements, need to carry out aseismic analysis, the structure of reducing elbow is strong
The mechanical properties such as degree, rigidity should meet design requirement under seismic condition, to improve seismatic method for pipeline performance.Moreover, variable diameter is curved
The design of the outer dimension of pipe is also required to by Mechanical Calculation and Analysis, to meet the mechanical property and shockproof requirements of requirements for pipes.
It should be noted that the sequence of above-mentioned steps is simply to illustrate that the present embodiment and a specific example proposing,
Without limitation to the sequences of above-mentioned steps, those skilled in the art can on demand be adjusted it present invention in practical applications.
In conclusion the present embodiment determines the connection of the reducing elbow used according to the arrangement space of connecting pipe and equipment
Mode, outer dimension；Specific arrangement connection type is determined by mechanics of piping analysis, and the straight pipe part of reducing elbow can be with
Support of pipelines is set, to meet the support requirement of pipeline.Pipe arrangement connection method used by the present embodiment is set using special
The reducing elbow of meter, it is contemplated that the factors such as workshop arrangement space, the trend for designing pipeline and Mechanics Calculation result are completed to become
The specific design and the connection of reducing elbow and pipeline or equipment room of diameter bend pipe can reduce the pipeline of connection various outer diameter or set
Occupied arrangement space when standby, improves the utilization rate of room pipeline and equipment arrangement space, while reducing field pipes welding
Difficulty, and improve the antidetonation and mechanical property of piping.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of reducing elbow characterized by comprising sequentially connected first straight pipe, bend loss, reducer and second are straight
Pipeline section, and first straight pipe is different from the outer diameter of second straight pipe；The reducing elbow all pipeline sections one at
Type.
2. reducing elbow according to claim 1, which is characterized in that the outer diameter of first straight pipe is greater than described second
The outer diameter of straight pipe.
3. reducing elbow according to claim 1, which is characterized in that first straight pipe and second straight pipe
Bore hole and groove are machined at nozzle.
4. a kind of pipe arrangement connection method using the reducing elbow of any of claims 1-3, which is characterized in that
Include the following steps:
1) Preliminary design is carried out to the reducing elbow: items is connected according to the arrangement space of the reducing elbow and its both ends
Crank degree and relative distance between nozzle, the bending angle and radius of the bend loss of reducing elbow described in Preliminary design, Yi Ji
The length of one straight pipe, reducer and the second straight pipe；
2) be arranged design to the reducing elbow: the outer dimension of the reducing elbow according to Preliminary design, synthesis are examined
Consider construction and installation factor, the arrangement of the positions of the items of the connection of reducing elbow both ends described in appropriate adjustment, angle and periphery items
Position；
3) mechanics verifying is carried out to the reducing elbow.
5. pipe arrangement connection method according to claim 4, which is characterized in that in step 1), the reducing elbow
Arrangement space, the arrangement for connecting the positions of items, outer dimension and periphery items according to the reducing elbow both ends is true
It is fixed.
6. pipe arrangement connection method according to claim 4, which is characterized in that the step 1) further include:
The nozzle sizes and wall thickness of items are connected with the reducing elbow both ends according to relevant criterion file, are become described in Preliminary design
The welding manner and wall thickness of diameter bend pipe.
7. pipe arrangement connection method according to claim 4, which is characterized in that the step 2) further include:
The adjustment of the position of items, the position of angle and periphery items is connected as a result, right according to the reducing elbow both ends
The outer dimension and welding manner of the reducing elbow are adjusted.
8. the pipe arrangement connection method according to any one of claim 4-7, which is characterized in that the step 3) is specific
Include:
31) it tests to the mechanical property of the reducing elbow；
32) it tests to the weld strength of the reducing elbow；
33) stress analysis is carried out to piping where the reducing elbow；
34) according to above-mentioned steps 31) to step 33) analytical control as a result, outer dimension and pipeline to the reducing elbow
Arrangement is adjusted, until meeting design requirement.
9. pipe arrangement connection method according to claim 8, which is characterized in that the step 3) further include:
35) according to the stress analysis result of piping where the reducing elbow, it is determined whether branch is arranged on the reducing elbow
Frame and backing positions, number of holders, cradling function and load on the reducing elbow.
10. pipe arrangement connection method according to claim 8, which is characterized in that the step 3) further include:
36) according to the shockproof requirements of the reducing elbow, pipe fitting aseismic analysis is carried out；Further according to described in the adjustment of aseismic analysis result
The mechanical property of reducing elbow, until its mechanical property meets design requirement under seismic condition.
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| CN201910270774.9A CN110005895B (en) | 2019-04-04 | 2019-04-04 | Reducing elbow and pipeline arrangement and connection method using same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113739071A (en) * | 2021-09-06 | 2021-12-03 | 中国电建集团重庆工程有限公司 | Instrument pipeline arrangement sample method and thermal control instrument pipeline |
| CN115070275A (en) * | 2022-05-20 | 2022-09-20 | 国家石油天然气管网集团有限公司 | Welding method and welding device for long-distance pipeline, processor and storage medium |
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