Cooler is very important in chemical production, which directly affects the quality of work safety and stable operation of the system. "A cold", as the name implies that the product of the first condenser, diglycolamine 2 # synthetic "a cold" due to lower heat transfer efficiency, which had been carried out repeatedly plugging work, but has not been completely resolved, and the closure head office openings to elicit fleeing circulating water high-pressure gas. Due to the high-pressure gas venting main ingredient NH3 and H2, this approach is not only there is a huge security risk, but also pollute the environment, waste of resources. To this end, chemical plant as planned on "a cold" for the replacement work. As the pre-prepared, effective coordination, act in harmony, lifting, piping, welding, leak testing and a series of processes step by step, in order, to achieve the desired purpose of technical innovation, to enhance productivity, reduce maintenance chance to provide a strong guarantee !