A troubleshooting case study in a fertilizers unit, India. Solving the problem of Feed/Effluent Exchanger E-3321A/B in Process Condensate stripping section of Ammonia plant by stripping section of Ammonia plant by Analytical approach. The problem solved by in Analytical approach. The problem are solved by in house experts without changing the heat exchangers while others plants change the heat exchangers. Number of modification done and huge amount of energy saved.  The paper intends to describe how to save energy by changing heat exchanger and pressure of PC Stripper. The treated process condensate was earlier cooled by CW in final cooler from about 90ºC to 40ºC. CW in final cooler from about 90ºC to 40ºC. This available heat of PC is being recovered by exchanging heat with DM water in a plate heat exchanger. The pressure of PC stripper has been raised to about 1.5 kg/cm²g to make the extra heat recovery possible. Now pressure is 41.5 kg/cm2. A new Plate heat exchanger was procured & installed for the heat recovery procured & installed for the heat recovery.