WO2005057070A1 - ラインパイプの歪硬化特性決定方法 - Google Patents
ラインパイプの歪硬化特性決定方法 Download PDFInfo
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- WO2005057070A1 WO2005057070A1 PCT/JP2004/018858 JP2004018858W WO2005057070A1 WO 2005057070 A1 WO2005057070 A1 WO 2005057070A1 JP 2004018858 W JP2004018858 W JP 2004018858W WO 2005057070 A1 WO2005057070 A1 WO 2005057070A1
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- WIPO (PCT)
- Prior art keywords
- strain
- pipe
- stress
- buckling
- local buckling
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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
- F16L9/00—Rigid pipes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/14—Pipes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
Definitions
- the present invention relates to a method for determining strain hardening characteristics of a pipe used for a gas pipeline, a pipe manufacturing method, a pipe, and a pipeline.
- Gas pipelines and oil pipelines are being constructed as the basis of energy supply.
- gas fields have often been developed far away from the consuming area, especially due to the growing demand for natural gas.
- pipelines have been trending toward longer distances, and the trend toward larger diameters and higher pressures for mass transportation has been increasing.
- Figure 13 shows a flowchart of the pipeline construction focusing on such pipeline design.
- Conventional pipeline designs can be broadly classified into (1) system design and (2) structural design.
- system design the pipe type, pipe diameter, pipe thickness, and operating pressure are tentatively set so that the operating and construction costs of the pipeline are minimized, assuming the transport volume and transport distance that represent the project scale. Is done.
- structural design based on the strength of the pipes temporarily set in the system design, the topography of the installation site, etc. In consideration of the above, a structural analysis is carried out, and an allowable stress check, an allowable strain check, and a local buckling check are performed.
- Local buckling check refers to local buckling of a pipe under conditions tentatively set in the system design, which can withstand the maximum compressive strain and maximum bending strain expected under the conditions in which the pipeline is laid. This is to check whether or not it has performance. Specifically, the local buckling strain of the designed pipe is determined, and whether the local buckling strain is greater than the maximum strain generated in the pipeline. Judge by whether or not.
- the method of obtaining the local buckling strain of the designed pipe was as follows.
- the local compression buckling strain of a pipe is generally expressed as the compression local buckling strain-coefficient (tube thickness / tube diameter) finger.
- the coefficients and indices in the above relational expressions are obtained by plotting the compression local buckling test data of an actual pipe as shown in Fig. 14 and drawing a curve so as to envelop the lower limit of the experimental data. Ask to do so.
- Table 1 shows the equation for estimating local buckling strain obtained based on the buckling test of the actual pipe described above.
- the local buckling strain estimation formula specified in the current design standards shown in Table 1 is based on experimental data of pipes of X65 (strength grade according to the American Petroleum Institute (API) standard in the United States). . This is why the application range is limited to line pipes of X65 or less in Fig. 13.
- the compression local buckling strain is obtained based on this estimation formula, and this is the maximum. It is determined whether it is greater than the distortion. If it is smaller than the maximum distortion, return to the system design and reset the conditions.
- a local buckling experiment is performed by making a sample pipe as a prototype, and the local buckling strain of the pipe is obtained. Then, it is determined whether or not the obtained local buckling strain of the pipe is larger than the maximum strain. In this case as well, when the size is small, as in the case of X65 or less, a sample pipe with an increased pipe thickness is manufactured again and checked. Disclosure of the invention
- the present invention has been made in order to solve such a problem, and an object of the present invention is to provide a method for determining strain hardening characteristics of a pipe that can reduce costs while ensuring safety.
- Another object of the present invention is to obtain a pipe manufacturing method using the method for determining strain hardening characteristics of the pipe, and further obtain a pipe and a pipeline manufactured by the pipe manufacturing method.
- the inventor of the present invention based on the idea of estimating the local buckling strain required for a pipe, for example, by estimating the local buckling strain of a pipe by giving the system designed pipe diameter and pipe thickness, The required local buckling strain is also given in advance in addition to the pipe diameter and pipe thickness determined in accordance with the above, and the local buckling strain required to design the pipe material that satisfies these conditions is determined in advance. It turned to the idea of giving, and found that it is effective to utilize new parameters that were not noted in the conventional structural design in this material design. As a result of further study, they found that the strain hardening characteristic of the pipe is a parameter that greatly affects the local buckling behavior of the pipe as a new parameter, and completed the present invention.
- the strain hardening characteristic is a parameter indicating the degree of increase in strain with respect to an increase in stress or the degree of increase in stress with respect to an increase in strain.For example, as a slope of a tangent to a stress-strain curve at a buckling point, or It is given as the stress relationship between multiple points combining the buckling points and auxiliary points in the strain curve.
- the method for determining the strain hardening characteristics of the pipe according to the present invention consists of the pipe condition setting step of setting the pipe diameter D, the pipe thickness t, the required compression local buckling strain ⁇ Teq of the pipe, and the pipe condition setting.
- “in the vicinity of the buckling point” is determined using a virtual buckling point and an auxiliary point provided near the buckling point to calculate the tangent coefficient ⁇ ⁇ ⁇ , as described later.
- the purpose is to include the partial stress relationship between a plurality of points in the “strain hardening characteristics” here. '
- the yield ratio (Y / T) (the ratio between the tensile strength T and the yield stress Y) is 0.80, 0.0 for the ratio D / t of the pipe diameter D to the pipe thickness ⁇ of 50 and 60, respectively.
- the method of determining the strain hardening characteristics of a pipe when the pipeline is subjected to bending deformation is a pipe condition setting step of setting the pipe diameter D, pipe thickness t, and required bending local buckling strain of the pipe, and bending. From the quantitative relationship between the local buckling strain and the compression local buckling strain, a local buckling strain conversion step of converting the required bending local buckling strain into a required compression local buckling strain £ req ; t and the required compression local buckling strain ⁇ req, a strain hardening characteristic obtaining step for obtaining a strain hardening characteristic near a buckling point of the pipe that should satisfy all of the conditions, And a process to be a condition to be satisfied.
- a maximum bending strain calculating step for obtaining a maximum bending strain generated in the pipe when the bending is performed; and setting a required bending local buckling strain based on the maximum bending strain; and further calculating a bending local buckling strain and a compression local buckling strain.
- a strain hardening characteristic acquisition step of obtaining the strain hardening property in the buckling point near is pre tribute himself strain hardening property as having the steps of a condition to be satisfied by the stress-strain curve of the pipe.
- the strain hardening characteristics in the above (1) to (4) are obtained by assuming a virtual buckling point on a stress-strain coordinate corresponding to the required compression local buckling strain ⁇ req. It is characterized by being given on the basis of the slope of the tangent line of the stress-strain curve at the appropriate buckling point.
- a req is the stress at a point on the stress-strain curve corresponding to re ⁇
- equation (1.1) of (6) will be described.
- Equation (1.2) is a basic equation representing the buckling strain of a pipe subjected to a compressive force.
- V is the Poisson's ratio
- t is the thickness of the pipe
- D is the diameter of the pipe
- E ser is the stress-strain curve of the continuous hardening type.
- Figure 8 shows the slope of the line connecting the origin and the buckling point (hereinafter referred to as the " separation coefficient")
- E Tcr is the slope of the stress-strain curve at the buckling point (hereinafter referred to as the "tangent coefficient"). ).
- Equation (1.2) substituting 0.5 for Poisson's ratio V in the case of plastic deformation and rearranging it gives Equation (1.3) below.
- the required local buckling strain ⁇ rei is used, the required tangent coefficient is the minimum value that satisfies the required conditions. Therefore, when these conditions are added to Eq. (1.5), E Tre , which is a condition to be satisfied by the stress-strain curve, is expressed by Eq. (1.6) below.
- a req is the stress at the point corresponding to E req on the stress-strain curve.
- equation to the right side of which contains a re (1 is a dependent variable of epsilon req. Therefore, organize right as a function of the tentative values Contact Yopi required value, the dependent variable CTre4 the left When the tangent coefficient E req , which is the required value, is placed, it becomes Eq. (1.7), which is shown in (6) above.
- Equation (1.3) can be generally expressed as Equation (1.8) below, where A is a constant.
- equation (4.1) equation (5.9) equation constants 9/16 may be replaced with 1 / A 2
- equation constants 9 / 132 can be replaced with 1 / (2A 2 ).
- the strain hardening characteristic in any of the above (1) to (4) is a virtual value on a stress-strain coordinate corresponding to the required compression local buckling strain ⁇ req. Assuming a typical buckling point and one or more auxiliary points at a position where the strain value is distant from the buckling point, a plurality of points are calculated using the virtual buckling point and the one or more auxiliary points. It is characterized by being given as a partial stress relationship between them.
- the strain hardening property As a partial stress relationship between a plurality of points, it becomes easy to determine whether or not a pipe manufactured by an existing manufacturing method satisfies a required strain hardening property, for example. That is, since the stress-strain relationship of a pipe manufactured by the existing manufacturing method is given as a sequence of points, the required strain hardening characteristics are given as a partial stress relationship between multiple points to obtain the existing data. And the above determination can be easily performed.
- Figure 9 shows the assumed continuous hardening type stress-strain curve.
- the horizontal axis in Fig. 9 represents the compression axial strain of the pipe, and the vertical axis represents the compression axial stress.
- ⁇ cr on the horizontal axis is the required compression local buckling strain
- ⁇ 2 is the strain at auxiliary point 2 set at an arbitrary interval to the right of ⁇ cr .
- the points on the stress-strain curve corresponding to ⁇ ⁇ and ⁇ 2 on the horizontal axis are called buckling point C and trapping point 2, respectively.
- the stresses at the buckling point C and the auxiliary point 2 are represented by ⁇ 2 and 2 , respectively.
- the secant coefficient E Scr is represented by the gradient of the line connecting the coordinate origin and the buckling point C.
- Equation (2.4) replaces equation (2.2) ⁇ Q
- the required local buckling strain is expressed as E re , as in the case of (6) above.
- the stress corresponding to the required local buckling strain s req on the stress-strain curve is ⁇ ⁇ 3 ⁇ 4
- the right-hand side of equation (2.5) can be rearranged as a function of the tentatively determined value and the required value.
- equation (2.6) shows the lowest value
- equation (2.7) the partial stress relationship between multiple points as a condition to be satisfied by the stress-strain diagram of the pipe is expressed by the following equation (2.7). This is the same as the above equation (2.1).
- Figure 10 shows the assumed continuous hardening type stress-strain curve.
- the horizontal axis in Fig. 10 represents the compression axial strain of the pipe, and the vertical axis represents the compression axial stress.
- ⁇ cr on the horizontal axis is the local buckling strain of the compression, and £ and ⁇ 2 are the strains at auxiliary points 1 and 2 set at arbitrary intervals on the left and right of ⁇ cr .
- the distance E l and, epsilon E distance E 2 and is equally spaced.
- epsilon and epsilon 2 points each locus corresponding stress strain curve in ⁇ (:., Referred to as auxiliary points 1 and auxiliary point bidentate ⁇ (:, auxiliary points 1 and auxiliary points
- the stresses on the vertical axis corresponding to 2 are denoted as ⁇ cr , ⁇ , and ⁇ 2 , respectively.
- point is the midpoint of point 1 and point C
- point B is the midpoint of point C and point 2.
- the strains on the horizontal axis corresponding to points A and B are denoted as ⁇ A and ⁇ ⁇ , respectively, and the respective values are the average values of ⁇ 1 and f cr , ⁇ detergentand ⁇ 2 .
- the epsilon Alpha and E each sigma Alpha stress on the vertical axis corresponding to the B, and sigma beta.. made Expressing these relations by equations below (3.2) to (3.5) equation (
- the required local buckling strain input as the required value is denoted as the required local buckling strain ⁇ req to distinguish it from the local buckling strain r. I do.
- the stress corresponding to the required local buckling strain eq on the stress-strain curve is assumed to be cr re (1 ) Since equation (3.8) shows the minimum value, the stress-strain curve of the pipe must be The partial stress relationship between the points is given by the following equation (3.9), which is the same as the above equation (3.1).
- Another method for determining strain hardening characteristics of a pipe according to the present invention is that the partial stress relationship between a plurality of points in the above (7) satisfies the following equation (4.1). It is a feature.
- Equation (4.1) Equation (4.1) will be described.
- the required local buckling strain input as the required value is denoted as a required local buckling strain ⁇ req to distinguish it from the local buckling strain ⁇ cr .
- the stress corresponding to the required local buckling strain E req on the stress-strain curve is req . Since equation (4.14) shows the lowest value, the partial stress M between multiple points that must be satisfied by the stress-strain curve of the pipe is expressed by the following equation (4.15). Is the same as
- the partial stress relationship between a plurality of points in the above (7) satisfies the following equation (5.1). It is characterized by the following.
- Figure 12 shows the assumed continuous hardening type stress-strain curve.
- the horizontal axis in Fig. 12 represents the compression axial strain of the pipe, and the vertical axis represents the compression axial stress.
- the required local buckling strain input as a required value is denoted as a required local buckling strain ⁇ req to distinguish it from the local buckling strain ⁇ admir.
- the stress corresponding to the required local buckling strain E req on the strain curve is assumed to be cj req Since Equation (5.8) shows the minimum value, the portion between the plurality of points that the stress-strain curve of the pipe must satisfy is eventually obtained.
- the typical stress relationship is the following equation (5.9), which is the same as the above equation (5.1).
- the method for determining the strain hardening characteristics of other pipes according to the present invention is the same as that described in (1) to (11) above, in addition to the strain hardening characteristics, the yield stress determined by the material standard or required conditions.
- the range and the tensile stress range are the conditions to be satisfied by the stress-strain curve of the pipe.
- the manufacturing method can be narrowed down by setting the yield stress range and the tensile stress range as conditions.
- the judgment step in (13) above is a judgment on the case of manufacturing by the existing manufacturing method, and if the existing manufacturing method does not have an appropriate one, the chemical component setting of the material 4018858 Judgment on the manufacturing method with the total and / or process design changed.
- the continuous hardening type is a condition to be satisfied by the stress-strain curve of the pipe.
- the method for manufacturing a pipe according to the present invention comprises a material design step of designing the material of the pipe by the method for determining the strain hardening characteristic of a pipe described in any of (1) to (14) above.
- a pipe according to the present invention is characterized by being manufactured according to the pipe manufacturing method described in (16).
- a pipeline according to the present invention is characterized by being constituted by connecting the pipes described in (17) above.
- the required local buckling strain is given in advance in addition to the pipe diameter and the pipe thickness, and the pipe material is designed so as to satisfy this condition.
- the material design of the pipe to be satisfied becomes possible.
- FIG. 1 is a flowchart illustrating the first embodiment of the present effort.
- FIG. 2 is an explanatory diagram of the lateral flow distribution of the ground according to the first embodiment of the present invention.
- FIG. 3 is a graph showing a finite element analysis result according to the first embodiment of the present invention. .
- FIG. 4 is a flowchart illustrating a determination step according to Embodiment 1 of the present invention.
- FIG. 5 is an explanatory diagram of a lateral slip fault in the ground according to the second embodiment of the present invention.
- FIG. 6 is a graph showing a finite element analysis result according to Embodiment 2 of the present invention.
- FIG. 7 is an explanatory diagram illustrating the relationship between the local compression buckling strain and the local bending buckling strain of a pipe.
- FIG. 8 is an explanatory view of the concept of local buckling in the stress-strain curve of the intermittent hardening type.
- FIG. 9 is an explanatory diagram of a stress relationship between a plurality of points on a stress-strain coordinate according to the present invention (part 1).
- FIG. 10 is an explanatory diagram of a stress relationship between a plurality of points on stress-strain coordinates according to the present invention (part 2).
- FIG. 11 is an explanatory diagram of a stress relationship between a plurality of points on a stress-strain coordinate according to the present invention (part 3).
- FIG. 12 is an explanatory diagram of a stress relationship between a plurality of points on a stress-strain coordinate according to the present invention (part 4).
- Figure 13 is a flowchart explaining the flow of a general gas pipeline construction process (part 1).
- FIG. 14 is an explanatory diagram of the relationship between experimental data on local buckling strain and design equations.
- Figure 15 is a flowchart explaining the flow of a general gas pipeline construction process (part 2). BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a flowchart illustrating a method for determining strain hardening characteristics of a pipe according to an embodiment of the present invention.
- the pipe used for the pipeline is determined based on at least the transport amount and the transport distance of the pressurized fluid transported in the pipeline determined by the project scale (S1).
- a determining step (S13) of determining whether or not a pipe having the mechanical properties indicated by the stress-strain curve satisfying the condition when the characteristic is a condition of the stress-strain curve of the pipe can be manufactured;
- the operating cost is a function of the operating pressure P and pipe diameter D, and the operating pressure is a function of the transport volume Q, pipe diameter D and transport distance L.
- the pipe diameter D is a function of the transport volume Q, operating pressure P, and transport distance L.
- Construction cost is a function of tube diameter 0, tube thickness t, material grade T S (yield strength), and tube thickness t is a function of transport pressure P, material grade T S. Therefore, it is necessary to determine the diameter D, the pipe thickness t, and the transport pressure so as to minimize the cost by adjusting the parameters related to each other.
- the outer diameter D 610.0
- the tube thickness t 12.2mm
- the material grade T S API 5L X80
- the design internal pressure 10MPa.
- the standard minimum yield point (YSmin) is 551MPa
- the allowable width of tensile strength TSmin 620MPa
- TSmax 827MPa.
- Figure 2 shows the ground displacement distribution that should be considered when lateral flow occurs.
- the figure also shows the general concept of a buried pipeline that is deformed by lateral flow.
- the displacement distribution of the ground due to the lateral flow can be expressed by the width W of the lateral flow and the maximum displacement 5.
- W width of the lateral flow
- W maximum displacement 5.
- S nax is assumed to be 2.0 m.
- the pipeline shown in Fig. 2 is modeled by shell elements, and the maximum compression bending is performed by the finite element analysis program. Calculate strain and maximum tensile bending strain.
- the panel characteristics of the ground were set based on the Design Guidelines for Liquefaction of Gas Pipe Liquefaction (2003).
- the stress-strain curve of the material is provisionally determined so as to satisfy the minimum yield stress (SMYS) and the minimum strength resistance (SMTS) specified in the API standard.
- Figure 3 shows the maximum compressive bending strain (positive sign) and maximum tensile bending strain (negative sign) of the pipeline among the results calculated by the finite element analysis program.
- the maximum bending strain generated in the pipeline shows a maximum value when the lateral flow width W is 30m.
- the maximum compressive bending strain which is important in considering local buckling, is maximum at W of 30 m, which is about 2%.
- the local bending buckling strain and the local compression buckling strain are as follows. (See Fig. 7), the maximum axial strain in this case is about 1%.
- the required compression local buckling strain is determined.
- the required buckling strain is determined in consideration of a predetermined safety factor above the maximum compressive axial strain. In this example, the required buckling strain is set to 1% which is almost the same as the maximum compressive axial strain (S7).
- a virtual buckling point on the stress-strain coordinate corresponding to the required compression local buckling strain ⁇ req and a position where the strain value is distant from the buckling point is assumed, the virtual buckling point and the first auxiliary point are used to give a partial stress relationship between a plurality of points.
- strain hardening characteristics are given based on the above-mentioned equation (2.1).
- FIG. 4 is a flowchart for explaining the determination step.
- a more optimal method for example, manufacturing You can choose a method that improves stability, reduces manufacturing costs, or improves buckling resistance, in which case, choose method C with a large value of H so that the local buckling strain is greater ( S5 5), proceed to SI 5 in Fig. 1.
- the side A pipe that satisfies the required compression local strain required for the flow is obtained and satisfies the safety, and the pipe thickness t at this time is determined in consideration of the cost in the pipe condition setting step. It is also economical.
- the steel with no yield shelf and large local buckling strain has a two-phase structure of ferrite and a hard phase (such as bainite and martensite).
- a hard phase such as bainite and martensite.
- the structure of the hard phase and the hard phase fraction can be changed to change the strain hardening characteristics.
- the structure of the hard phase and the hard phase fraction can be changed by changing the amounts of carbon (C) and manganese (Mn), for example.
- the determined production method and pipe specifications are presented to the cypress and checked (S15).
- the scriber confirms the specifications of the pipe, etc., and if he understands it, places an order with the manufacturer, and the manufacturer who receives the order manufactures according to the determined manufacturing method (S17).
- the manufactured pipe is delivered to the client and the pipeline is constructed (S19), and operation starts after the construction (S21).
- the present embodiment relates to a method for determining strain hardening characteristics for preventing local buckling of a strike-slip fault. Since the processing flow of the present embodiment is basically the same as that of the first embodiment, overlapping parts will be briefly described, and different parts will be described in detail.
- the pipe diameter D, pipe thickness t, and transport pressure are set based on the amount and distance of the pressurized fluid transported in the pipeline to minimize operating and construction costs. Tentatively decide.
- the pipe specifications provisionally determined in the present embodiment are the same as those in the first embodiment.
- the material grade is TS: API 5L X80.
- the design internal pressure was tentatively determined to be 10MPa.
- the standard minimum yield point (YSmin) is 551MPa
- TSmax 827MPa.
- Fig. 5 shows the general concept of a buried pipeline that is deformed by a strike-slip fault.
- the maximum displacement ⁇ ⁇ was set to 2.0 m as in the case of the embodiment, and the panel characteristics of the ground were set in the same manner as in the embodiment 1.
- Figure 6 shows the maximum compressive bending strain (positive sign) and the maximum tensile bending strain (negative sign) of the pipeline among the results calculated by the finite element analysis program.
- the maximum bending strain that occurs in the pipeline occurs at a distance of about 5 m from the fault plane, and the maximum compressive bending strain that is important in examining local buckling is about 2. 4%. Since half of the compressive bending strain is the local compression strain, the maximum compression axial strain is about 1.2%.
- the required compression local buckling strain is determined. In this example, considering the safety factor of 1.25, the required local buckling strain ⁇ req was determined to be 1.5 %.
- the strain hardening characteristics are obtained based on equation (2.1).
- the auxiliary point was set at 2.0% by adding 0.5% to the required buckling strain (1.5%).
- the calculation is as follows. Process of setting strain hardening characteristics as conditions for stress-strain curve of pipe
- candidate manufacturing methods A, B, D, E, and F are selected from the conventional manufacturing results, and the required buckling strain is calculated from the stress-strain curves.
- the pipe thickness determined in consideration of the cost in the pipe condition setting process can be adopted as much as possible, which satisfies safety and is excellent in economy. Material design of the pipe can be realized.
- the required buckling strain can be arbitrarily specified.
- the required buckling strain must be specified as a value after the strain-hardening region, whereas materials with continuous-hardening-type stress-strain curves must be specified.
- material design is simplified.
- the bending local buckling strain is given as a required condition in the pipe condition setting step, and the bending local buckling strain is determined from the quantitative relationship between the bending local buckling strain and the compression local buckling strain.
- the compression local buckling strain is converted. However, when the compression local buckling strain is given as a required condition, only the above-described conversion step is eliminated, and the other embodiments are not described. ,
- the strain hardening characteristic is given as a partial stress relationship between a plurality of points.
- the present invention is not limited to this. Assuming a virtual buckling point on the stress-strain coordinate corresponding to the buckling strain eq , it can be given as a slope of a tangent of the stress-strain curve at the virtual buckling point.
- the material grade material standard
- the present invention is not limited to this.
- the requirements of the pipeline company the range of YS, TS, etc. may be used as the conditions to be satisfied by the pipe in the pipe condition setting process.
- the pipe condition setting step (S1, S3) and the maximum compression axial strain calculation step (S5) based on the transport volume and transport distance may be performed by a pipeline company other than a pipeline company, for example, a steel company or a consulting company.
- the required compression local buckling strain setting step (S7) to determination step (S13) may be performed by a company other than a steel company, for example, a pipeline company or a consulting company.
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/581,403 US7513165B2 (en) | 2003-12-10 | 2004-12-10 | Method for determining strain hardening property of line pipe |
EP04807216.9A EP1693608B1 (en) | 2003-12-10 | 2004-12-10 | Method of determining strain hardening characteristics of line pipe |
CN2004800369256A CN1890498B (zh) | 2003-12-10 | 2004-12-10 | 管道钢管的应变硬化特性决定方法 |
CA2545401A CA2545401C (en) | 2003-12-10 | 2004-12-10 | A method for constructing a portion of a pipeline |
NO20063156A NO342111B1 (no) | 2003-12-10 | 2006-07-07 | Fremgangsmåte for bestemmelse av deformasjonsherdingsegenskap for ledningsrør |
Applications Claiming Priority (2)
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JP2003411285 | 2003-12-10 | ||
JP2003-411285 | 2003-12-10 |
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WO2005057070A1 true WO2005057070A1 (ja) | 2005-06-23 |
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PCT/JP2004/018858 WO2005057070A1 (ja) | 2003-12-10 | 2004-12-10 | ラインパイプの歪硬化特性決定方法 |
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US (1) | US7513165B2 (ja) |
EP (1) | EP1693608B1 (ja) |
CN (1) | CN1890498B (ja) |
CA (1) | CA2545401C (ja) |
NO (1) | NO342111B1 (ja) |
WO (1) | WO2005057070A1 (ja) |
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EP1843143A1 (en) * | 2005-12-15 | 2007-10-10 | JFE Steel Corporation | Method for evaluating local buckling capability of steel pipe, method for designing steel pipe, process for producing steel pipe, and steel pipe |
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WO2008105990A1 (en) | 2007-02-27 | 2008-09-04 | Exxonmobil Upstream Research Company | Corrosion resistant alloy weldments in carbon steel structures and pipelines to accommodate high axial plastic strains |
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CN116227266A (zh) * | 2022-12-21 | 2023-06-06 | 广西北投公路建设投资集团有限公司 | 波折钢腹板屈曲模态的确定方法及屈曲应力的计算方法 |
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JPH08109994A (ja) * | 1994-10-11 | 1996-04-30 | Osaka Gas Co Ltd | 継手融着シミュレーション装置及び継手製造方法及び隙間の縮まり方を制御する方法 |
Cited By (4)
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US8875366B2 (en) | 2004-06-18 | 2014-11-04 | Jfe Steel Corporation | Local buckling performance evaluating method for steel pipe, steel pipe designing method, steel pipe manufacturing method, and steel pipe |
EP1843143A1 (en) * | 2005-12-15 | 2007-10-10 | JFE Steel Corporation | Method for evaluating local buckling capability of steel pipe, method for designing steel pipe, process for producing steel pipe, and steel pipe |
EP1843143A4 (en) * | 2005-12-15 | 2013-01-23 | Jfe Steel Corp | METHOD FOR EVALUATING THE LOCAL TENUE DURING THE FLAMBING OF A STEEL DRIVE, METHOD FOR DESIGNING STEEL PIPES, PROCESS FOR PRODUCING STEEL PIPES, AND STEEL PIPES |
NO341762B1 (no) * | 2005-12-15 | 2018-01-15 | Jfe Steel Corp | Fremgangsmåte for lokal bulkytelsesevaluering for stålrør, fremgangsmåte for stålrørkonstruksjon, fremgangsmåte for stålrørfremstilling, og stålrør |
Also Published As
Publication number | Publication date |
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US20080276714A1 (en) | 2008-11-13 |
NO20063156L (no) | 2006-09-08 |
EP1693608A4 (en) | 2010-10-20 |
NO342111B1 (no) | 2018-03-26 |
CA2545401C (en) | 2021-07-27 |
US7513165B2 (en) | 2009-04-07 |
CN1890498B (zh) | 2010-07-28 |
EP1693608A1 (en) | 2006-08-23 |
CA2545401A1 (en) | 2005-06-23 |
CN1890498A (zh) | 2007-01-03 |
EP1693608B1 (en) | 2017-08-30 |
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