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Method for calculating limit internal pressure of single-defect bent pipe

A technology of ultimate internal pressure and calculation method, applied in the field of oil and gas industry, which can solve the problems of inaccurate results and achieve the effect of high prediction accuracy

Inactive Publication Date: 2021-02-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the bent pipe with local thinning defect and the straight pipe with the same diameter-thickness ratio, the ultimate internal pressure is very different. If the ultimate pressure bearing capacity of the straight pipe is used to calculate the ultimate pressure bearing capacity of the elbow, it may cause Inaccurate results

Method used

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  • Method for calculating limit internal pressure of single-defect bent pipe
  • Method for calculating limit internal pressure of single-defect bent pipe
  • Method for calculating limit internal pressure of single-defect bent pipe

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with examples. It should be understood that the specific examples described here are only used to explain the present invention, not to limit the present invention.

[0031] The example situation of the single-defect elbow limit internal pressure calculation method provided by the example of the present invention is as follows:

[0032] This example adopts X60 steel grade, the pipe diameter is 508mm, the wall thickness is 22.23mm, the curvature radius R=1.5D, the bending radius is 762mm, the yield strength is 450MPa, the tensile strength is 542MPa, the design pressure is 10MPa, and the operating pressure is 6.49 ~8.13MPa booster station natural gas pipeline as an example.

[0033] (1) Calculation example when the defect depth coefficient c<0.3:

[0034] Step 1: Count the relevant size parameters...

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Abstract

The invention belongs to the technical field of petroleum and natural gas industry, and discloses a method for calculating the limit internal pressure of a single-defect bent pipe, which comprises thefollowing steps of: on the basis of a defect straight pipe limit load evaluation standard and a defect-free bent pipe limit load formula, considering the changes of defect depth, length and width, and fitting the formula by using 1stopt software, and obtaining a prediction formula of the limit internal pressure of the single-defect bent pipe, and verifying the accuracy of the formula according toblasting test data. According to the method, the limit internal pressure of the single-defect bent pipe of the booster station can be calculated through a formula, reference is provided for formulating the calculation standard of the failure pressure of the single-defect bent pipe in China, and an important theoretical support is provided for design and safety evaluation of the bent pipe of the gas pipeline.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas industry, and in particular relates to a method for calculating the ultimate internal pressure of a single-defect elbow. Background technique [0002] The elbow is a key component in the oil and gas pipeline transportation system, which can be used to change the direction of the pipeline and withstand a certain degree of elastic deformation; because the elbow is a double-curvature structure, it will cause erosion to the elbow when the fluid flows through it. Both the medium inside the pipe and the soil outside the pipe will corrode the pipe wall, and bent pipes are more likely to have defects such as pits and local thinning than straight pipes; the existence of defects will reduce the pressure bearing capacity of the bent pipe and affect the safe operation of the station; therefore It is necessary to establish a calculation formula for the ultimate pressure bearing capacity of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/15
CPCG06F17/15
Inventor 孔令圳何雨珂黄坤刘慧吴霞
Owner SOUTHWEST PETROLEUM UNIV
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