Thermal oxidation accelerated aging test device and service life prediction method for in-service polyethylene pipeline

Abstract

The invention discloses a thermal oxidation accelerated aging test device and a service life prediction method for an in-service polyethylene pipeline, and belongs to the technical field of polyethylene pipeline life detection. The device is characterized in that an air pump, a valve, a pressure meter, a pressure reducing valve and the polyethylene pipeline are connected through airtight pipelines in sequence; the polyethylene pipeline is sealed through a seal clamp and arranged in an aging box. The method comprises the following steps: performing thermal oxidation accelerated aging tests on the in-service polyethylene pipeline at 110 DEG C and a new polyethylene pipeline with the same type and size as the in-service polyethylene pipeline at 100 DEG C and 110 DEG C for brittle fracture respectively, and recording the time t[old]110, t[new]100 and t[new]110 for the three tests to obtain the predicted service life t[real] of the in-service polyethylene pipeline, wherein the t[real] is described in the specification. The device can be used for performing the thermal oxidation aging tests under the condition that the polyethylene pipeline keeps the internal pressure the same as the actual working condition, and is simple and short in test time; the method using the device can provide theoretical references for engineering application.

Description

technical field [0001] The invention belongs to the technical field of life detection of polyethylene pipes, and in particular relates to a thermal oxygen accelerated aging test device and a life prediction method of polyethylene pipes in service. Background technique [0002] Polyethylene pipes have good physical and mechanical properties, corrosion resistance and superior economy, gradually replacing traditional metal pipes, and are widely used in gas transmission. However, polyethylene is a polymer material and is prone to aging, so polyethylene pipes have problems of aging and failure. The service life of polyethylene pipes under a certain pressure is a very important indicator in engineering applications. Experiments show that the service life of high-density polyethylene pipes can reach more than 50 years. At present, the life prediction formula for polyethylene pipes is based on the ISO9080 standard formulated by the American Plastic Pipe Association (determining the...

AI Technical Summary

Problems solved by technology

[0005] However, due to factors such as construction quality and third-party damage, the service life of polyethylene piping systems is greatly shortened

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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