In this article, the cause of the fracture of the piston rod used in 4M50 hydrogen compressor in the hydrocracking device was analyzed.

• 对镇海炼油化工股份有限公司加氢裂化装置4M50型新氢压缩机活塞杆两次断裂的原因进行综合分析,并提出了补救和预防措施。