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在石油炼化生产装置中，常遇到液态烃输送过程中发生泄漏事故，而液态烃泵的机封泄漏是最常见的故障，克服液态烃泵机封泄漏是技术上的一个难点和热点。为此，人们作了各种技术和管理上的尝试，河南油田炼油厂聚丙烯装置建成试车过程中，四种型号的液态烃泵原装机封泄漏严重，机封损坏频繁，几乎造成生产无法维持。技术人员根据每种型号泵的具体结构和各自的工艺条件，分别对密封胶进行了不同的改造，采取给密封腔内设置螺旋套、自冲洗装置等措施，选用新型抗抽空能力强，具有优越的追随性和补偿能力的波纹管机封，彻底消除了液态径系抽空、结霜、振动、机封泄漏破损等问题，使机封的使用寿命由原来的1～7d（有时几个小时）提高到半年、个别达到10个多月，节约了资金，提高了设备可靠度，为安全生产提供了保障。
In the petroleum refining and production plant, it is often encountered during the delivery of liquid hydrocarbons leak, while the leakage of liquid hydrocarbon pump machine seal is the most common failure to overcome the leakage of liquid hydrocarbon pump machine seal is a technical difficulty and hot spots. To this end, people made a variety of technical and management attempts, Henan Oilfield Refinery polypropylene plant built test run, the four models of liquid hydrocarbon pump original machine seal leak serious machine seal damage frequently, almost unable to maintain the production . Technical personnel according to the specific structure of each type of pump and their respective process conditions, respectively, sealant were modified to take to set a sealed chamber spiral sleeve, since the flushing device and other measures, the selection of new anti-pump ability, superior Follow-up and compensation of the bellows machine seal, completely eliminate the liquid path pumping, frosting, vibration, seal leakage damage and other issues, so that the life of the seal from the original 1 ~ 7d (sometimes a few hours) Increased to six months, up to more than 10 months, save money, improve equipment reliability, provided a guarantee for safety in production.