Presents some practices and experiences to fulfill long term operation of ammonia plant, and proposes specific methods, such as compiling failure preventive scheme, scientific management and specific equipment management as well as in-situ safety management to fulfill long term operation of ammonia plant.

In the light of delayed coke operation in Petrochina Jinzhou Petrochemical Company,and in consideration of the major factors affecting the longterm operation of the coke,the purpose of reducing coking in furnace tubes,coke tower gas pipelines and fractionators were all analyzed.