玻璃钢管试压渗漏的原因

Reason for Pressure Testing Leakage of Glass Fiber Reinforced Plastic Pipe

国内某油田地面集输系统用玻璃钢管在现场试压过程中发生渗漏事故,通过宏观形貌观察、壁厚测量、玻璃化转变温度测试、树脂含量测试、静水压试验、短时失效压力试验、微观形貌观察等对其失效原因进行了分析。结果表明:在以弯曲应力为主导的外力作用下,玻璃钢管外壁加厚过渡区出现大量环向裂纹,从而降低了玻璃钢管的整体承内压能力,导致在现场试压过程中发生渗漏事故;玻璃钢管外表面的玻璃化转变温度偏低,说明其外表面的固化度较低,性能较差,这促进了管外壁环向裂纹的出现。

The glass fiber reinforced plastic pipe used in ground gathering system of an oil field in China leaked during pressure test on site.The failure reason was analyzed by macroscopic morphology observation,wall thickness measurement,glass transition temperature test,resin content test,hydrostatic pressure test,short-term failure pressure test and microscopic morphology observation.The results show that by the external force dominated by the bending stress,a large number of circumferential cracks appeared in the thickened transition region of the glass fiber reinforced plastic pipe outer wall,resulting in the reduction of overall internal pressure resistance of the pipe,and leading to the leakage of the pipe during pressure test on site.The glass-transition temperature of outer surface of the glass fiber reinforced plastic pipe was low,indicating that the curing degree of the outer surface was low and the performance was poor.The poor performance promoted the appearance of circumferential cracks in the outer wall of the pipe.