This book is the result of many years of engineering experience in oil and gas industry in terms of engineering, construction and integrated management of onshore and offshore oil and gas transmission pipelines. It contains functional concepts in mechanical engineering of transmission pipelines, corrosion protection, cathodic protection, horizontal directional drilling (HDD), pigging, telecommunication and leak detection, health management, preventive repair management, risk management and etc. TOP’s various engineering departments including Process, Material and Corrosion, Electrical, Telecommunication and Instrument share their practices in this book.