Understanding why and how failures occur is critical to failure prevention, as even the slightest breakdown can lead to catastrophic loss of life and asset as well as widespread pollution. This book helps anyone involved with machinery reliability, whether in the design of new plants or the maintenance and operation of existing ones, to understand why process equipment fails and thereby prevent similar failures. Process industries are home to a huge number of machines, most of them critical to the industry mission. Failures of these machines can result in consequences that range from the simple replacement of a cheap bearing to an accident that may cost millions in lost production or cause injuries or pollution. Competition forces corporations to try to keep a pace in optimisation. On the machinery side of the history, that means improving efficiencies, reliability, and reducing maintenance cost. Designs and purchase specifications, shop testing, installation, maintenance and operation all play a role in these efforts. The objective of this book is to help anyone involved with machinery reliability, be it in the design of new plants or the maintenance and operation of existing ones, to understand why the process machine fails, so some preventive measures can be taken to avoid another failure of the same kind.