A method for predicting the remaining life of polyethylene gas pipelines in service

Abstract

A method for predicting the remaining life of polyethylene pipelines for in-service gas belongs to the technical field of life detection for polyethylene pipelines. This method first needs to carry out an accelerated aging test on polyethylene pipes of the same grade as the in-service gas polyethylene pipes, prepare aged polyethylene pipes according to the requirements of the method, record the aging time, temperature and pressure, and then use the differential calorimetry scanning method to test the aged polyethylene The oxidation induction period of the pipeline, record the oxidation induction period data group, and obtain the remaining life prediction formula: finally, it is only necessary to scrape a small amount of fines on the outer surface of the polyethylene pipeline in service for differential calorimetry testing, and then the obtained oxidation induction period Substitute the value into a in the remaining life prediction formula 0 Calculations are performed to predict the remaining life of the gas polyethylene pipeline under operating conditions. The life prediction method does not affect the normal operation of urban gas polyethylene pipelines, is simple and time-saving, has a certain ability to discriminate data, and can provide technical support for the safe operation of in-service gas polyethylene pipelines.

Description

technical field [0001] The invention belongs to the technical field of life detection of polyethylene pipelines, in particular to a method for predicting the remaining life of polyethylene pipelines for in-service gas. Background technique [0002] Due to the characteristics of corrosion resistance, light weight and low frictional resistance of polyethylene pipes, polyethylene pipes have been widely used in urban gas pipeline transportation. However, polyethylene is a polymer material and is prone to aging, so polyethylene pipes have the problem of aging failure. At present, the transportation of gas-fired polyethylene pipelines in service needs to be operated under a certain pressure. The service life of gas-fired polyethylene pipelines under a certain pressure is a very important indicator in engineering applications. The national standard stipulates that the temperature is 20 ℃ The service life of polyethylene gas pipeline is not less than 50 years. At present, the ISO9...

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Problems solved by technology

This method has little integration with the actual working conditions, the test time is long, and the pipe needs to be cut from the in-service pipeline for the test, which will seriously affect the normal operation of the gas pipeline, and there will also be safety hazards in the secondary welding of the pipeline

[0005] Low-property aging polyethylene pipes have been used for decades, and gas polyethylene pipes are mostly distributed in densely populated areas. There have been many polyethylene gas pipeline explosions and leakage accidents at home and abroad, causing serious economic losses and even endangering Personal safety

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