«Equipment and technologies for oil and gas complex»

Evaluation of the stress-strain state and strength of a three-layer polypropylene pipe sample with a crack-like defect

UDC: 621.643.053
DOI: 10.33285/1999-6934-2023-2(134)-68-75

Authors:

¹ Ukhta State Technical University, Ukhta, Russia

Keywords: laboratory bench, modeling, stress-strain state, polypropylene pipe, limiting state, strain gauge, experiment

Annotation:

An alternative to steel as a pipes material for gas and oil pipelines are polymers (polyethylene, polypropylene, polyvinyl chloride, etc.). The strength of polymer pipes is increased by the introduction of reinforcing layers into their design. The lack of the criteria for the strength and reliability of such pipes, based on the analysis of the stress-strain state, prevents their use when transporting hydrocarbons. The article evaluates the stress-strain state of a three-layer polypropylene pipe sample having a glass fiber reinforced middle layer with a crack-like defect by means of physical experiment and numerical computer simulation in the Ansys software. A comparison of the results obtained by the two methods application is presented. The reasons for their similarity and differences are indicated. In the reinforcing layer the stress values are greater than in others, as it is the layer that takes up the loads on a pipe. A method for evaluating the strength of the polymer three-layer pipes is proposed. It includes the introduction of three limit states, each of which corresponds to limiting stress intensity and limiting pressure. The maximum operating pressure is also calculated. When it is compared with the actual pressure on the pipeline section, final strength assessment is made and a list of activities to maintain the operating state of the pipeline is determined. The stress-strain state and strength of the polymer three-layer pipe with longitudinal crack-like defects in case of their different depths have been evaluated. An example of the application of the developed method for assessing the strength of a pipeline with crack-like defect is discussed.

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