某石化公司催化裂化装置为减少凝缩油泵机械密封泄漏的发生,进行了机械密封系统改造。将金属波纹管单端面密封改为串联式机械密封,在实际运行中频繁出现泄漏,现场检查发现主密封的凝缩油介质只有微量泄漏,而副密封的隔离液泄漏较多。通过改变大气侧外密封材质,改进密封结构及其附件,更换隔离液,改变操作条件等措施,解决了密封失效的问题,使金属波纹管密封得以长周期安全平稳运行。 A petrochemical company catalytic cracking unit to reduce condensation pump mechanical seal leakage occurred, the mechanical seal system transformation. The metal bellow single-end seal instead of series mechanical seal, frequent leaks in the actual operation, the site inspection found that the main seal condensate oil medium trace leakage, while the secondary seal leakage more leakage. By changing the atmosphere side of the outer sealing material, to improve the sealing structure and its accessories, the replacement of the isolation fluid, changing the operating conditions and other measures to solve the problem of sealing failure, the metal bellows seal to long-term safe and stable operation.