This book is an introductory reference guide to hydro-testing and hydrostatic pressure testing in the oil and gas field. The book examines the common techniques of pressure testing the oil and gas tubing and casing string to ensure its quality and mechanical integrity. The author introduces the reader to the tools, equipment, and application methods of hydro-testing and hydrostatic pressure testing. It also talks about the safety precautions one must take during the process. This work may appeal to readers who are interested in oil and gas field techniques.