The lifespan of an ammonia or urea plant depends on a number of factors

 The lifespan of an ammonia or urea plant depends on a number of factors, including the plant's production capacity, the fertilizer industry's production capacity, and the plant's energy efficiency:

Production capacity

The life expectancy of a urea plant depends on the production capacity of the fertilizer industry. 

Energy efficiency

The survival of the industry depends on improving energy efficiency. For example, the IFFCO Aonla Unit has implemented energy conservation schemes to run its 1988 ammonia plant efficiently. 

Plant-related downtime

Plant-related downtime can be caused by mechanical, electrical, process, and instrumentation issues. Mechanical problems account for the majority of plant-related downtime. 

External factors

Factors external to the plant can also cause downtime, such as power supply disruptions or water supply problems.