Energy conservation and waste heat recovery are important global issues of our times. Attock Oil Refinery Limited (ARL) is pioneer in crude oil refining in Pakistan. After thorough surveys and analysis Heavy Crude Unit (HCU) was selected for energy conservation and waste heat recovery. A detailed study of the plant led to the identification of potential zones for energy conservation and waste heat recovery. Energy conservation was done in the pre-heat train which exchanges heat between the products at high temperature and crude at low temperature. By increasing the heat exchange...