Reinforced thermoplastic pipes (RTPs) are being increasing used in China National Petroleum Corporation(CNPC), owing to their good corrosion resistance and easily installation technique. Several thousand kilometers of RTPs has been deployed in natural gas transporting system in Changqing Oilfield since 2007. After one year serving of PET fiber reinforced polyethylene pipe, several failures happened. Therefore, it is necessary to study the effects of environmental factors, including temperature and installation damages, on the strength of PET fiber and RTPs. The primary failure modes of RTP pipe are analyzed and the residual strength tests of RTP pipes, which are cut from the pipes near the failure spot, are carried out. The result shows that the strength of RTP pipe decreases with increase of temperature from 0°C to 65°C. The damages of the protective layer (the outer layer) have little influence on the strength of pipe, while those damages of reinforced fiber layer have much influence. Finally, some suggestions are given for future application of RTPs in Oilfield(Jerry,2000).
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