运行不可靠的 meaning in Chinese

unserviceable

We establish a gravitational coagulant addition system which core is establishing mathematical model on the basis of the actuality of water works in different country , and we successfully resolved the problem that the ordinary coagulant addition systom is always irreliable . the gravitational coagulant addition system which can be used in different water works is economical and reliable . we analyze several factors which influence the addition quantity of coagulant
本文在分析研究国内外有关给水处理厂的投药系统的现状的基础上，结合我国的实际情况，提出了以数学模型为核心的给水处理厂的重力投药方式，成功的解决了长期困惑给水处理厂的投药系统运行不可靠的难题，系统建设既经济又可靠，适合于大、中、小型给水处理厂，具有较强的应用空间。