The book has been written with the intention that it should serve as a research material for students as well as to provide a guide to the upcoming CGD entities across the country. A real good effort has been made to put in place the experience gained by the CGD stalwarts over a period of time and to bring forth the complex technicalities of a City Gas Distribution Business in a proper perspective for the readers to understand. Further, an attempt has been made to put all the information in a most exhaustive but simple manner to comprehend the various aspects of a CGD. With almost all major cities being expected to have high and medium pressure pipelines running below congested areas and laid by an host of new companies and contractors, this book will act as a guide for employees of the CGD entities and act as a beacon to the new and existing students and engineers who wish to built a career in the Gas arena.