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Safety evaluation method for polyethylene pipe hot melting joint containing fusion surface defect

A technology of polyethylene pipes and hot-melt joints, applied in complex mathematical operations, geometric CAD, instruments, etc., can solve the problems of lack of safety evaluation methods and achieve the effect of filling the gaps in safety evaluation

Pending Publication Date: 2022-07-26
SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE +1
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of safety evaluation methods for various defects including hot-melt welding. According to the characteristics of polyethylene pipes, analyzing the failure mode of defects and calculating the ultimate load under the defective pipes are the basic methods to explore the safety evaluation of HDPE pipes

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  • Safety evaluation method for polyethylene pipe hot melting joint containing fusion surface defect
  • Safety evaluation method for polyethylene pipe hot melting joint containing fusion surface defect
  • Safety evaluation method for polyethylene pipe hot melting joint containing fusion surface defect

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Embodiment Construction

[0047] The invention provides a safety assessment method for a polyethylene pipe hot-melt joint containing fusion surface defects, comprising the following steps:

[0048] Step 1: Characterize the defects of polyethylene pipes with fusion surface defects, determine the specifications of the pipes at the defective parts, determine the size of the defects, and carry out regularization processing;

[0049] Step 2, determine the mechanical properties of polyethylene material, and obtain material parameters such as stress-strain curve, yield stress and elastic modulus through tensile test;

[0050] Step 3, calculate the ultimate load under the defect-free joint;

[0051] Step 4: Calculate the limit load of the hot-melt joint with incomplete penetration defects of the fusion surface by the finite element analysis method, and establish the limit load regression formula

[0052] Step 5: Obtain the ultimate load of the incomplete penetration defect of the fusion surface at any size, d...

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Abstract

The invention provides a safety evaluation method for a hot-melt joint of a polyethylene pipe with fusion surface defects, which is used for carrying out safety evaluation on the incomplete penetration defect of a fusion surface in a hot-melt welding process on the basis of GB / T27512 and polyethylene pipe characteristics. The method comprises the following steps: firstly, carrying out defect characterization and regularization treatment on polyethylene pipe welding defects; the limit load of the defect-containing joint is simulated and calculated by means of finite element software, a limit load calculation formula is obtained according to fitting of a limit load regression model and used for calculating limit internal pressure and limit bending moment under different defect sizes, and then a safety evaluation curve under the defect is determined. In engineering practice, the method has important guiding significance for evaluating the safe use of the defect-containing polyethylene pipe welded joint.

Description

technical field [0001] The invention relates to the field of safety evaluation of in-use gas and oil pipelines, in particular to a safety evaluation method for a polyethylene pipe hot-melt joint with fusion surface defects. Background technique [0002] The distribution of oil and natural gas is uneven, and there are a large number of long-distance oil and natural gas pipelines for energy transmission in various places. As a new type of pipeline, high-density polyethylene pipes are gradually widely used in various industries with excellent characteristics and stable performance. However, the non-standard production, transportation, installation, and connection process of new pipelines are prone to safety hazards, which will affect the overall service life of pipelines, and pose strict requirements and new challenges to improve the safe use of pipelines. [0003] High Density Polyethylene Pipe (HDPE) has the advantages of good corrosion resistance, toughness, light weight, a...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/23G06F17/18G06F119/02
CPCG06F30/17G06F30/23G06F17/18G06F2119/02Y02P90/30
Inventor 燕集中赵兴民赵建平孙昊天宋高峰浦江吴胜平
Owner SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE