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我公司承建牡丹江炼油厂两台120M~3球罐的拼装、焊接工程。该球罐的主要技术参数如下:球罐内径6100mm、壁厚24mm、材质16MnR、设计压力16kg/cm~2。球罐在拼装前按炼化建“403-77”规范对球片进行了超声波探伤抽查,其抽查率为35％,且每带不少于2片,检查结果均符合“JB 1150-73”压力容器用钢板超声波标准Ⅲ级规定的要求,而在球片进行开坡口时,发现没有超探过的球片中有夹层缺陷,经超声波探伤确认缺陷已超过规范要求。为确保球罐工程质量,我们对全部球片进行了超探(包括已组焊完毕的球片)。先后发现三块不合格的球片,其中一
My company to build Mudanjiang refinery two 120M ~ 3 spherical tank assembly, welding engineering. The main technical parameters of the tank are as follows: spherical tank diameter 6100mm, wall thickness 24mm, material 16MnR, design pressure 16kg / cm ~ 2. Spherical tank prior to assembly according to refinery built “403-77” normative ball ultrasonic examination, the sampling rate of 35%, and each with not less than 2, the test results are in line with “JB 1150-73” Pressure vessel with steel plate ultrasonic standard Ⅲ requirements, and in the groove when the groove, found no ultra-exploration of the ball in the sandwich defect, the ultrasonic flaw detection to confirm the defect has exceeded the specification requirements. In order to ensure the quality of the spherical tank, we have performed all the ultrasonography of the pellets (including the finished pellets). Has found three failed ball, one of them