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针对Q235C钢制液氨储罐在实际运行中产生的大范围壁厚减薄等缺陷进行无损检测试验研究,在不破坏罐体本身的情况下,查清缺陷原因、性质,并提出了预防措施。结果表明:超声测厚发现该储罐壁厚异常,与封头相连的两筒节中断续出现多处异常测厚点;超声波检测(UT)发现,在壁厚异常处沿钢板厚度方向存在缺陷,可能为分层或夹渣;磁粉检测(MT)及渗透检测(PT)结果显示,在罐体壁厚减薄区域未见超标缺陷,所有检测部位均为Ⅰ级合格,确信壁厚减薄区域的外表层无缺陷,也没有内部缺陷扩展至表层而产生新缺陷;Q235C钢材在储罐运行过程中未发生劣化。
According to the non-destructive testing of large-area wall thickness thinning caused by the actual operation of Q235C steel liquid ammonia storage tank, the causes and properties of the defects and the preventive measures were put forward without destroying the tank itself . The results show that the wall thickness anomaly of the tank was found by ultrasonic thickness measurement, and several abnormal thickness measurement points appeared discontinuously in the two tube joints connected with the head. Ultrasonic testing (UT) showed that there was a defect along the thickness of the steel sheet in the abnormal wall thickness (MT) and permeation test (PT) showed no over-standard defects in the thinning area of the tank body, and all the test sites were Grade I qualified, so it is believed that the wall thickness is thinner There was no defect in the outer surface of the area and no internal defects extended to the surface resulting in new defects; Q235C steel did not deteriorate during operation of the storage tank.