Chemical transmission lines, petroleum and natural gas lines, pressure vessels, and pipes used in thermal facilities are expected to maintain their mechanical properties for many years without being damaged and not to be corroded in working conditions. The composite materials are the right candidate for these harsh conditions due to their superior properties. Reinforcement of nanoadditives to composite materials improves both the mechanical properties and the resistance to environmental conditions, thereby increasing the lifetime. In this study, multi-walled carbon nanotube (MWCNT) reinforced [± 55°] carbon fiber/epoxy composite pipes produced with filament wound method were used. It was hydrothermally aged in 80 °C distilled water for 1, 2, 3 weeks in order to examine the effect of environmental conditions. In order to investigate its resistance against loads that may occur in working conditions, ring tensile tests (ASTM D 2290–16 procedure A), and low-velocity impact tests at 5, 10, 15 J, energy levels were carried out. The effect of hydrothermal aging on neat and MWCNT added epoxy composite had been examined by considering the aging period. Consequently, the impact resistance of neat and MWCNT added samples decreased with the aging process. Besides, tangential tensile strength loss was 17% in MWCNT reinforced sample and 13% in the neat sample.

化工输送管线、石油和天然气管线、压力容器以及热力设施中使用的管道，预计在工作条件下能够保持其机械性能多年而不会损坏和腐蚀。由于其优异的性能，复合材料是这些恶劣条件的正确候选材料。纳米添加剂对复合材料的增强可提高机械性能和对环境条件的抵抗力，从而延长使用寿命。在这项研究中，使用了采用纤维缠绕法生产的多壁碳纳米管 (MWCNT) 增强 [± 55°] 碳纤维/环氧树脂复合管。将其在 80 °C 蒸馏水中进行水热老化 1、2、3 周，以检查环境条件的影响。为了研究其对工作条件下可能发生的载荷的抵抗力，进行了环拉伸试验（ASTM D 2290-16 程序 A）和 5、10、15 J 的低速冲击试验，进行了能量水平。通过考虑老化时间，研究了水热老化对纯环氧复合材料和添加多壁碳纳米管的环氧复合材料的影响。因此，纯样品和添加多壁碳纳米管的样品的抗冲击性随着老化过程而降低。此外，MWCNT 增强样品的切向拉伸强度损失为 17%，纯样品为 13%。因此，纯样品和添加多壁碳纳米管的样品的抗冲击性随着老化过程而降低。此外，MWCNT 增强样品的切向拉伸强度损失为 17%，纯样品为 13%。因此，纯样品和添加多壁碳纳米管的样品的抗冲击性随着老化过程而降低。此外，MWCNT 增强样品的切向拉伸强度损失为 17%，纯样品的切向拉伸强度损失为 13%。