Polyethylene pipes have been widely used in the urban gas industry. However, there are few researches on the safety performance evaluation of polyethylene pipes in use at home and abroad, which makes it impossible to carry out Fitness-For-Service evaluation of defects found in the inspection, and thus cannot accurately judge the safety status of defective polyethylene pipes. In this paper, two typical polyethylene pipe materials, PE80 and PE100 are selected. Based on the tensile performance test, the constitutive model is established. Using the method of finite element simulation, the ultimate pressure bearing capacity of 9 defect models was analyzed and studied. And the relationship between defect size and pressure bearing capacity was initially determined. Provides a foundation for subsequent engineering applications.
Station pipes are important part of the oil and gas delivery system. At present, there are no targeted internal pipeline inspection standards for station pipes. So we can’t inspect the station pipes effectively. According to the characteristics of station pipes, this paper introduce the typical damage modes of station pipes, analyze the applicability of common corrosion inspection technology, weld inspection technology, stress corrosion fatigue inspection technology and fatigue damage inspection technology in the inspection of station pipes, propose an inspection method for the station pipes. The field application shows that this inspection method can inspect station pipes effectively, but due to the particularity of station pipes, the method still has some limitations and shortcomings.
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