CN105205342A - Method of determining limit load of high temperature pressure pipeline - Google Patents
Method of determining limit load of high temperature pressure pipeline Download PDFInfo
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- CN105205342A CN105205342A CN201510711285.4A CN201510711285A CN105205342A CN 105205342 A CN105205342 A CN 105205342A CN 201510711285 A CN201510711285 A CN 201510711285A CN 105205342 A CN105205342 A CN 105205342A
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Abstract
The invention discloses a method of determining a limit load of a high temperature pressure pipeline. The method comprises the following steps: (1) determining a material, service temperature and service time of a high temperature service pressure pipeline; (2) acquiring an isochronal stress-strain curve of the material under the service temperature and the service time; (3) based on the isochronal stress-strain curve, using finite element calculation software to simulate and calculate the limit load of the high temperature pressure pipeline; (4) according to a finite element simulating calculation result, defining a pressure value corresponding to 2 percent strain of the high temperature pressure pipeline as a limit stress that the material can serve for corresponding time under high temperature. The invention provides the method of determining the limit load of the high temperature pressure pipeline, which adopts a numerical simulation means and is a method capable of being used for simply, conveniently and quickly determining the limit load of the pressure pipeline during service under a high temperature environment.
Description
Technical field
The present invention relates to a kind of method determining high temperature pressure pipeline ultimate load, belong to the Integrity Assessment technology that pressure pipeline is on active service in high temperature environments.
Background technology
Ultimate load refers to the maximum load that pressure vessel and piping can bear, i.e. maximum load-carrying capacity.At present, the Main Means studying the ultimate load of pressure vessel and piping has analytic methods, numerical analysis method and experiment analytical method.Ultimate load is fixed really, has twice elasticity slope criterion, bitangent criterion, zero curvature criterion, twice elastic deformation criterion, three times of δ criterions, plastic work done criterions etc., and wherein first three kind usage is commonplace.
At present, ripe ultimate load theoretical all for be pressure vessel and piping under normal temperature, and its ultimate load research is at high temperature less, does not have clear and definite ultimate load criterion to provide.Therefore, determine pressure vessel and piping ultimate load at high temperature, the Integrity Assessment technology of being on active service in high temperature environments for it has important practical significance.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of method determining high temperature pressure pipeline ultimate load, effectively can determine the ultimate load of high temperature pressure pipeline, be on active service in hot environment for high temperature pressure pipeline and safety guarantee is provided, improve high temperature integrity assessment technique.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
Determine a method for high temperature pressure pipeline ultimate load, comprise the steps:
(1) material of high-temperature service pressure pipeline, service temperature and active time is determined;
(2) obtain this material under arms under temperature and active time etc. time stress-strain diagram;
(3) based on stress-strain diagram when waiting, the ultimate load of finite element method analog computation high temperature pressure pipeline is used;
(4) according to the result that finite element method analog computation obtains, the stress value occurred by high temperature pressure pipeline corresponding to 2% strain is defined as this material under high temperature and is on active service the ultimate stress of corresponding time, and under load corresponding for ultimate stress being defined as high temperature, this material can be on active service the ultimate load of corresponding time.
During described grade, stress-strain diagram can be obtained by creep test, can also be checked in by standard.
In general, described active time should be greater than 100 hours.
The ultimate load of described finite element method analog computation high temperature pressure pipeline can adopt ABAQUS software simulating correlation computations.
Based on the method, can using 2% strain controlling point as ultimate load criterion.
Beneficial effect: the method determining high temperature pressure pipeline ultimate load of the present invention, be a kind of method of ultimate load when can determine that pressure pipeline is on active service in high temperature environments simply, easily and fast, the Integrity Assessment technology of being on active service in high temperature environments for it has important practical significance.
Accompanying drawing explanation
Stress-strain diagram when Fig. 1 is waiting of embodiment;
Fig. 2 is the ultimate stress method based on stress-strain diagram when waiting.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Determine a method for high temperature pressure pipeline ultimate load, comprise the steps:
(1) material of high-temperature service pressure pipeline, service temperature and active time is determined;
(2) obtain this material under arms under temperature and active time etc. time stress-strain diagram;
(3) based on stress-strain diagram when waiting, the ultimate load of finite element method analog computation high temperature pressure pipeline is used;
(4) according to the result that finite element method analog computation obtains, the stress value occurred by high temperature pressure pipeline corresponding to 2% strain is defined as this material under high temperature and is on active service the ultimate stress of corresponding time, and under load corresponding for ultimate stress being defined as high temperature, this material can be on active service the ultimate load of corresponding time.
During described grade, stress-strain diagram can be obtained by creep test, can also be checked in by standard.
In general, described active time should be greater than 100 hours.
The ultimate load of described finite element method analog computation high temperature pressure pipeline can adopt ABAQUS software simulating correlation computations.
Based on the method, can using 2% strain controlling point as ultimate load criterion.
Below for P91 steel, the present invention is made further instructions.
Determine a method for high temperature pressure pipeline ultimate load, comprise the steps:
(1) material of high-temperature service pressure pipeline, service temperature and active time is determined:
P91 steel is on active service 100,000 hour at 600 DEG C.
(2) obtain this material under arms under temperature and active time etc. time stress-strain diagram:
The stress-strain diagram of P91 steel is:
Wherein, σ is stress, and ε is strain, and E, K and n are material constant, ε
cr, Imaxfor the maximal value of transient creep strain, β is transient creep proportion of goods damageds coefficients,
for secondary creep speed, t is creep time.
Obtain P91 steel wait time stress-strain diagram as shown in Figure 1.
(3) based on stress-strain diagram when waiting, the ultimate load of finite element method analog computation high temperature pressure pipeline is used:
Finite element software ABAQUS is used to set up high temperature pressure pipeline model, using stress-strain diagram during the waiting of the P91 steel obtained as material parameter, the ultimate load of analog computation P91 steel high temperature pressure pipeline.
(4) according to the result that finite element method analog computation obtains, the stress value occurred by high temperature pressure pipeline corresponding to 2% strain is defined as this material under high temperature and is on active service the ultimate stress of corresponding time, and under load corresponding for ultimate stress being defined as high temperature, this material can be on active service the ultimate load of corresponding time:
By above-mentioned result of finite element statistical conversion, make load strain figure, the load corresponding to straining 2% is defined as the ultimate load of P91 steel pressure pipeline under relevant temperature and corresponding active time, as shown in Figure 2.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. determine a method for high temperature pressure pipeline ultimate load, it is characterized in that: comprise the steps:
(1) material of high-temperature service pressure pipeline, service temperature and active time is determined;
(2) obtain this material under arms under temperature and active time etc. time stress-strain diagram;
(3) based on stress-strain diagram when waiting, the ultimate load of finite element method analog computation high temperature pressure pipeline is used;
(4) according to the result that finite element method analog computation obtains, the stress value occurred by high temperature pressure pipeline corresponding to 2% strain is defined as this material under high temperature and is on active service the ultimate stress of corresponding time, and under load corresponding for ultimate stress being defined as high temperature, this material can be on active service the ultimate load of corresponding time.
2. the method determining high temperature pressure pipeline ultimate load according to claim 1, is characterized in that: during described grade, stress-strain diagram is obtained by creep test or checked in by standard.
3. the method determining high temperature pressure pipeline ultimate load according to claim 1, is characterized in that: described active time is greater than 100 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510711285.4A CN105205342A (en) | 2015-10-28 | 2015-10-28 | Method of determining limit load of high temperature pressure pipeline |
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| CN201510711285.4A CN105205342A (en) | 2015-10-28 | 2015-10-28 | Method of determining limit load of high temperature pressure pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110334465A (en) * | 2019-07-15 | 2019-10-15 | 中国石油大学(华东) | A Dynamic Fracture Prediction Method for Pipeline Under Gas Explosion Considering Dynamic Damage Evolution |
| CN112525692A (en) * | 2020-11-30 | 2021-03-19 | 中国石油天然气集团有限公司 | Method for evaluating bearing limit load of buried pipeline with defects |
-
2015
- 2015-10-28 CN CN201510711285.4A patent/CN105205342A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110334465A (en) * | 2019-07-15 | 2019-10-15 | 中国石油大学(华东) | A Dynamic Fracture Prediction Method for Pipeline Under Gas Explosion Considering Dynamic Damage Evolution |
| CN112525692A (en) * | 2020-11-30 | 2021-03-19 | 中国石油天然气集团有限公司 | Method for evaluating bearing limit load of buried pipeline with defects |
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