A Design Method for Glass Fiber Composite Crack Stopper Used in x100 Gas Pipeline

Abstract

The invention discloses a design method of a glass fiber composite material anti-cracking device for an X100 gas pipeline. The design method comprises the following steps of calculating a pipeline stress ratio according to a pipeline structure and stress parameters; calculating a natural gas pressure-reducing wave by adopting a BWRS state equation; judging whether a pressure-reducing wave platformexists or not according to the natural gas pressure-reducing wave curve; determining the thickness of the anti-cracking device under different conditions according to the judging results of the pipeline stress ratio and the natural gas pressure-reducing wave platform; and determining the length of the anti-cracking device and the grooves at the two ends of the anti-cracking device according to the thickness of the anti-cracking device under the different conditions. Meanwhile, when the mechanical property of the glass fiber composite material anti-cracking device is designed, three mechanicalproperty parameters of tensile strength, elasticity modulus and ultimate strain are specified. According to the method, the long-range expansion of ductile cracks in the X100 pipeline can be effectively prevented, and flexible anti-cracking of the ductile long-range expanded cracks can be realized.

Description

technical field [0001] The invention belongs to the field of fracture control of natural gas transmission pipelines, and relates to a flexible crack arrest method for preventing long-distance extension of ductile cracks in X100 gas transmission pipelines (including rich gas and lean gas), in particular to a glass fiber composite material crack arrester design method. Background technique [0002] Natural gas is a kind of clean energy, and it is also a flammable and explosive dangerous medium. It is usually transported by pipeline. Pipeline transportation has the characteristics of large transportation volume, continuous, rapid, economical, safe and reliable. During the long-term service of the pipeline, due to the effects of formation pressure, corrosion, fatigue, external mechanical damage, etc., accidents such as pipeline cracking and leakage should occur. Once the high-pressure natural gas pipeline cracks and expands for a long distance, it will cause huge disasters and ...

AI Technical Summary

Problems solved by technology

However, when glass fiber composites are used as crack arresters, there is still a lack of design methods and specifications, which greatly limits the application of glass fiber composite crack arresters

[0006] In addition, the crack arrester should promote flexible crack arrest. Sudden crack arrest will cause the crack to ring off when it enters the crack arrester. serious consequences to the surrounding environment

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