The compressed air system has various applications, each usage differs from another. The scope of this book covers the fundamentals and operation of compressed air systems, their maintenance and troubleshooting. This book contains five chapters and each chapter relates theory and practice. Chapter 1 discusses some useful introduction to compressed air systems, their components and the quality requirement in relation to the specific applications. Chapter 2 elaborates on types and operation of air compressors. Chapter 3 discusses the conditioning and treatment of compressed air. Chapter 4 explains the piping network and distribution of compressed air for industrial application. Chapter 5 concentrates on the maintenance and troubleshooting of air compressors and maintaining good quality compressed air. This book is very useful for academic and technical reference on the compressed air technology.