Numerical Simulation And Analysis Basic On Buried PE Gas Temperature Characteristics

In recent years, the continuous exploitation of natural gas and natural gas industry makes use has been developing rapidly. Experts generally believe the middle of the 21st century will use natural gas-based energy era. As PE (polyethylene, Following is the same) pipe corrosion resistance, and simple welding, Long service life and now it works in practice the successful application PE pipe in the gas pipeline has been widely promoted as the trend of the times.At this time, the study on the properties of PE pipe appears important. The issue is to use finite element software thermal analytical procedures applied to the PE pipe at different soil temperatures material and thermal stress and strain area study up, the combination of actual data, the establishment of a rational analysis model, the PE pipeline for more precise thermal analysis PE pipe in the soil temperature conditions of stress and strain. To the practical engineering of PE pipe laying taking into account the effect of temperature and temperature changes on the ground more often (for example, seasonal changes) on PE management to take effective measures to protect and extend the life of PE pipe.By using ANSYS thermal analysis functions, the establishment of finite element model of PE gas pipe in the soil temperature of 10°C, 20°C, 30°C, pipe wall temperature of 15°C, stress distribution simulation analysis, The results show : Wall always depend on the temperature distribution in the wall at both ends of the heat source temperature, high temperature heat source, This wall near the end of the high temperatures.Meanwhile, the wall stress calculation results overall analysis, we can draw :The same soil temperature, the temperature near the wall in places with high thermal stress larger, great stress, the strain deformation trend is stronger, that is the strength of the material damage more powerful; different temperatures, soil temperature increases, Soil temperature higher, the wall greater thermal stress, strain the more obvious. From the above analysis can be summarized as follows : the higher the temperature of the wall, the wall materials greater stress, stress-strain relationship map, we can see Stress greater value corresponding to the material greater strain, strain major strength of the material used greater impact, affect the operation of plastic pipe pressure could result in a pipeline must reduce operating standards. When stress reached a certain limit, it may give a high strength material damage, therefore, PE tubes at runtime, soil temperature should not be too high. When the soil temperature is above 20°C , with PE gas pipeline pressure to a lower grading system to ensure safe operation.