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A method for calculating the maximum displacement and bending stress in a process of pipe cleaning of a natural gas pipeline crossing structure

A technology for natural gas pipelines and spanning structures, which is applied to the calculation field of maximum displacement and bending stress in the process of pigging spanning structures of natural gas pipelines, and achieves the effects of clear calculation process, small calculation amount and simple formula

Active Publication Date: 2016-04-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
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Problems solved by technology

[0005] The invention provides a method for calculating the maximum displacement and bending stress in the pigging process of a natural gas pipeline spanning a structure, so as to solve various defects and deficiencies in the prior art

Method used

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  • A method for calculating the maximum displacement and bending stress in a process of pipe cleaning of a natural gas pipeline crossing structure
  • A method for calculating the maximum displacement and bending stress in a process of pipe cleaning of a natural gas pipeline crossing structure
  • A method for calculating the maximum displacement and bending stress in a process of pipe cleaning of a natural gas pipeline crossing structure

Examples

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example 1

[0061] Example 1: The length of a natural gas suspension cable spanning structure is 320m, the outer diameter of the pipeline is 1016mm, the running speed of the pigging ball is 3.2m / s, the length of the liquid bomb is 83m, and the average liquid holdup rate is 0.6. There are stiffening beams in the spanning structure , the section moment of inertia of the stiffened beam is 61.5m 4 , the bending section coefficient is 24.6m 3 , the modulus of elasticity of the steel is 2.06×10 5 MPa, find the maximum displacement and bending stress of the pipeline during the pigging process.

[0062] Step 1: The collected basic parameters include the span length L of the natural gas pipeline across the structure p =320m, crossing pipeline diameter d=1.016m, pig operating speed v p =3.2m / s, the liquid elastic length L in front of the pig when reaching the spanning structure s =83m, liquid holdup H l =0.6, the section moment of inertia of the stiffened beam is I z =61.5m 4 , the bending s...

example 2

[0072] According to the calculation results, the bending stress of the spanning structure is positive, indicating that it is stretched during the pigging process, but its value is small and will not cause damage to the spanning structure. Therefore, the spanning structure of the natural gas pipeline in this example is safe during the pigging process. Example 2: The spanning length of a natural gas stay cable is 200m, the outer diameter of the pipeline is 426mm, the running speed of the pigging ball is 3m / s, the liquid elastic length is 75.4m, the average liquid holdup is 0.4, the section moment of inertia of the pipeline is 2.83×10 -4 m 4 , the bending section coefficient is 1.32×10 -3 m 3 , the modulus of elasticity of the steel is 2.10×10 5 MPa, find the maximum displacement and bending stress of the pipeline during the pigging process.

[0073] Step 1: The collected basic parameters include the span length L of the natural gas pipeline across the structure p =200m, cr...

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Abstract

The invention provides a method for calculating the maximum displacement and bending stress in a process of pipe cleaning of a natural gas pipeline crossing structure. Conventional calculation methods require establishment of special finite element models for specific stay cable or suspension cable crossing structures, the requirements for the professional quality of calculators are high, the transferability is poor and the solving time cost is high. The method solves the problems by obtaining the maximum displacement and bending stress in the process of pipe cleaning of natural gas pipeline stay cable crossing structures via calculation formulas according to the basic parameters of the natural gas pipeline stay cable crossing structures. The method comprises the steps of collecting basic data of a natural gas pipeline stay cable crossing structure and a pipe cleaning plan thereof; selecting calculation parameters according to the basic form of the crossing structure; placing the collected basic data and calculation parameters in the formulas to calculate the maximum displacement and bending stress in the process of pipe cleaning of the natural gas pipeline crossing structure. The calculation method is simple; calculation results can represent the maximum displacement and bending stress of crossing structures under the action of pipe cleaning, so that the method provides basis for natural gas pipeline crossing structure pipe cleaning safety evaluation.

Description

technical field [0001] The invention belongs to the field of design and safety assurance of natural gas pipelines, and in particular relates to a calculation method for the maximum displacement and bending stress in the pigging process of a natural gas pipeline spanning a structure. Background technique [0002] A pipeline spanning structure is a construction project in which a pipeline passes overhead over natural or artificial obstacles, usually in two basic forms: suspension cables and cable-stayed cables. Since the 1970s, my country has started to build natural gas pipeline spanning structures. At present, there are 35 large and medium-sized pipeline spanning structures. [0003] After the natural gas pipeline is newly built and put into operation and during the normal operation cycle, it needs to be pigged to remove debris and accumulated water in the pipeline to ensure its transmission capacity. When pigging, the pig pushes the accumulated water in the pipe to form a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 吴瑕李卓然李长俊贾文龙
Owner SOUTHWEST PETROLEUM UNIV
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