This book is compiled based upon practical experience learned during working around 36 years in various chemical industries viz. Fine Chemical, Fertilizers, Gas Processing, LPG & C2-C3 Recovery Plants, Project Development of Natural Gas pipeline, International Gas Pipeline, LPG Pipelines. LNG Transportation, Project Appraisal, Financial Appraisal, Pre-feasibility / Detailed Feasibility study, City Gas Projects, Designing, Bidding , Costing , due diligence of Petrochemical industry, operation and stabilization of various grades production & stabilization using polymerization technology ( i.e. Slurry, Solution & Gas Phase ) at downstream of petrochemical plants etc. It will provide to understand polyethylene business globally and in the Indian perspective. India is a fast growing economy and petrochemical business is full of challenge as well as opportunities. It is concluded for sharing practical experience for the benefit of students, new entrants, professional & consultants for better learning and understanding.